DRIVING_SITE. Whenever a factored subquery is accessed more than once in the same SQL statement, the factored subquery in question is automatically materialized. Lets see. What happens if you've already found the item an old map leads to? predicate pushing and it is related to the _optimizer_extend_jppd_view_types DRIVING_SITE. Glad the note helped you bring the time down, and all the best with bringing it down even further. There are some circumstances where Oracle cannot push predicates. MODEL_MIN_ANALYSIS. The cardinality is in all but heavily hinted SQL statements one of the top measures that influences the cost and thus the execution plan to be taken. There is an analogous hint for a conversion from a full outer join to an outer join: FULL_OUTER_JOIN_TO_OUTER( tab_name_or_alias ), where tab_name_or_alias is the (parent) table with a IS NOT NULL-predicate (or similar). Oracle does not encourage hints inside or on views (or subqueries) because you can define views in one context and use them in another. This chapter explains how to use hints to force various approaches. Oracle PostersOracle Books DBAOracle "ENTITY_TYPE"='C' AND NVL("CUST". Beware that TRUNC is a DDL statement, which means that it comes with an implicit COMMIT in contrast to DELETE, which is a DML statement and requires an explicit COMMIT (or ROLLBACK). Question: What does Support, SQL TuningSecurityOracle When the main query returns many rows this transformation rarely leads to an optimal plan. NO_PUSH_PRED The no_push_pred hint prevents the pushing of a predicate from an outer query block into the contained inner query block. Looking for your input. The FIRST_ROWS hint instructs Oracle to optimize an individual SQL statement for fast response, . "CURRENCY_CODE" AND "CCAM"."BASE_CURR_CODE"="LATEST". In 10g the optimizer has not pushed the join predicate down into the view (the t1 join predicate appears in the hash join at line 2); I think this is because the view has been declared non-mergeable through a hint. Copyright 2014-2023, Ian Hellstrm Server "LE_ID")), filter(NVL("CR_CUST_STATUS",U'0')<>U'INACTIVE'), 20 - filter("BD". So lets see what happens when I try two separate hints again, fiddling with the thirdparameter, e.g. "DOC_REF_NO" AND "FDA". The PUSH_PRED hint instructs the optimizer to push a join predicate into the view. Unnest / no_unnest Whether or not to unnest subqueries. MySQLOracle SQL SQLSELECTUPDATEINSERTMERGEDELETE /*+ ALL_ROWS */ . On a smaller and simpler test case, I can use PUSH_PRED hint to force oracle to use JPPD but I am struggling to come up with a valid PUSH_PRED hint for the original sql, which involves more tables. nested loops join into a view, when the view is the outer The Oracle of NO_PUSH_PRED The NO_PUSH_PRED hint prevents pushing of a join predicate into the view. value of a join predicate and "push" it into the main view, "CR_CUST_STATUS",U'0')<>U'INACTIVE'), 68 - filter("LA". . when Oracle Support tells you to 2. when you know enough about them not to need to ask. NO_PUSH_PRED does exactly the opposite of PUSH_PRED. I did try playing with adding PUSH_PRED hint (with predicates) from the outline and managed to push all 3 join predicates, which resulted in runtime dropping from over 8 minutes to about 2 minutes (which is still not fast enough but better than 8 minutes). | Reply. In case the initialization parameter _CONVERT_SET_TO_JOIN has been set, you can use NO_SET_TO_JOIN( @SET$N ) to disable the transformation. Comment by Narendra January 20, 2020 @ 3:56 pm GMT Jan 20,2020 Thanks for contributing an answer to Stack Overflow! Oracle hints are optimizer directives that are used in SQL de-bugging to change the default execution plan for SQL. Oracle 19c OPT_PARAM Hint Tips. The critical feature of the problem is a union all view: Two points to note so far: first, the view is basically joining the same two tables in the same way twice but selecting different columns. For this to happen, check with the DBA that the PUSH_JOIN_PREDICATE initialisation parameter is set to TRUE, otherwise use the PUSH_PRED hint. servicesApplication Secondly, Ive listed two possible indexes for table t2 but commented one of them out. Optimizer hints are an. "SEGMENT_CODE_VALUE"='S'), 17 - access("G". You have to supply tab_name_or_alias and the scaling_factor, which is a correction (or fudge) factor to scale the optimizers estimates up or down. Searching my library for something completely different Ive just rediscovered the model I built to demonstrate the issue so Ive tested it against a couple of newer versions of Oracle (including 18.1) and found that the anomaly still exists. Oracle uses these hints when the referenced table is forced to be the inner table of a join, and they are ignored if the referenced table is the outer table. If you have SQL that joins simple tables to set based (union all, etc.) Connect and share knowledge within a single location that is structured and easy to search. The PUSH_SUBQ hint causes non-merged subqueries to be evaluated at the earliest possible step in the execution plan. This hint behaves the same way as setting a parameter (e.g, using alter session) except that the effect is for the statement only. For example: SELECT /*+ PUSH_PRED(v) */ t1.x, v.y FROM t1 (SELECT t2.x . makes sure that the data is not inserted by means of a direct-path insert. That predicate didnt make it, Is this answer out of date? "CR_CUST_STATUS",U'0')<>U'INACTIVE'), 97 - filter("DA". Remote Also, such hints can result in . table_B has about 1000000 rows, table_A - 200 rows. In many cases adding the hint /*+ push_pred(your_view_name) */ at the top of the query may be sufficient to get the predicate pushing you need, but you may need to look at the outline section of the execution plan and add a series of more complicated push_pred() and no_push_pred() hints because the push_pred hint has evolved over time to deal with increasingly complicated transformations. Since a direct-path insert is basically the same as appending data, the hint is named accordingly: APPEND. 29 SQL. Subsequent executions of the same statement can be satisfied with data from the cache, which means that Oracle can save on a few round trips to the database. "ENTITY_TYPE"='C' AND NVL("CUST". Do you have an Oracle 11g hint list? Reading your note has given me hope that I might be able to come up with a solution that does not have to depend upon the extended usage of PUSH_PRED hint. The cardinality estimate used by the optimizer is thus the original estimate times the scaling factor. The FIRST_ROWS hint instructs Oracle to optimize an individual SQL statement for fast response, . Im even less keen on doing that than I am on adding undocumented parameters to the push_pred() and no_push_pred() hints, of course; but having done it I did wonder if there are any SQL Plan Baslines in 11.1.0.7 production systems that already include the push_pred() and well end up changing plan on the upgrade to 11.2.0.4 because the numbering inside the hint is supposed to change with version. The same pattern of behaviour appears in 19c. "BCA_STATUS"='APPROVED'), 36 - access("ARAH"."DOC_REF"="BD". "ACTION"='APPROVED' OR "DA". Errata? The PUSH_PRED( tab_name_or_alias ) hint can be used to push a join predicate into an inline view, thus making the inline view a correlated subquery. With DRIVING_SITE( tab_name_or_alias ) you tell the optimizer to use the database in which tab_name_or_alias resides as the location to do all operations in; all data that is required to execute the statement is moved to that database through database links emanating from the initiating (local) database to the remote data sources. "LA_STATUS"=3 OR "LA". | Reply. Scripts Distributed queries access data from at least one remote data source. Once the SQL has been optimized by adding the hint, the Oracle professional will adjust schema statistics (using dbms_stats) to replicate the execution plan without the hint.. Oracle SQL & PL/SQL Optimization for Developers, may not have access to statistics on the remote site(s), subquery must be evaluated for each row of the main query, favour the subquery earlier in the process, individual subqueries rather than all subqueries. Oracle . To decrease overall I/O and thus improve the performance of the execution of a SQL statement, you want to minimize the amount of data to be moved around, especially across the database link. "CR_CUST_STATUS",U'0')<>U'INACTIVE'), 30 - access("CUST"."CR_CUST_ID"="BD". If the subquery is relatively expensive or . Or if video is more your thing, check out Connor's latest video and Chris's latest video from their Youtube channels. As a consequence, the subquery must be evaluated for each row of the main query , which may not sound like a good idea until you realize that it enables the optimizer to access the base tables and . For instance, the child table is the one were mainly interested in but we would also like to have data from the parent table that is linked to the child tables data by means of a foreign key. "BOOK_LOC" HAVING TO_CHAR(:B2)||:B3||:B4=TO_CHAR("FLA"."LEND_UNIT")||"FLA"."BOOK_LOC"||MAX("FDA". Typically the initialization parameter RESULT_CACHE_MODE is set to MANUAL, as FORCE causes all statements results to be cached, which is a bad idea when set at the system level. "ACTION"='CO-APPROVED', OR "FDA". What you have to be aware of are user-defined PL/SQL functions that are on a different site than the driving site, as they cause a sizeable performance hit because of data ping-pong. How is this different from subquery unnesting? "ACTION"='APPROVED' AND "FDA". Last updated: April 08, 2016 - 4:04 am UTC. PL/SQL reference manual from the Oracle documentation library. matter of trying to come up with best possible solution but at least this article explains the theory. What are good reasons to create a city/nation in which a government wouldn't let you leave. VS "I don't like it raining.". "DOC_REF_NO"), 116 - filter("FDA". "ACTION"='FORWARDED' OR "FDA". The data is placed at the most recently used end of the least recently used (LRU) list in the buffer cache, which is Oracles way of saying that the blocks line up for a LIFO queue. Decidability of completing Penrose tilings. e-mail: Burleson Consulting Insufficient travel insurance to cover the massive medical expenses for a visitor to US? (19.3.0.0), Your email address will not be published. When you specify this hint, Oracle executes the SQL statement without any attempt to replace literals with bind variables. LinuxMonitoringRemote supportRemote Results of a query or query fragment, including those that are not obtained by means of a full table scan, can be cached with the RESULT_CACHE hint. "ACTION"='PROPOSED' OR "DA". "LA_STATUS"=8 OR "LA". And of course, keep up to date with AskTOM via the official twitter account. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Text description of the illustration push_pred_hint.gif. Making statements based on opinion; back them up with references or personal experience. If it is, please let us know via a Comment, https://jonathanlewis.wordpress.com/2014/12/12/push_pred-evolution/. Loosely speaking, this blog note is the answer to a question posted about five years ago. Set transformation hints that have been deprecated, such as HASH_XJ, MERGE_XJ, and NL_XJ, where X can be either S for semi-joins or A for anti-joins, are not listed here. SupportApps (LogOut/ Is there a place where adultery is a crime? and the second is debateable. Less excellent we have a Cartesian Merge Join between t1 and t4 before pushing predicates. The indexing will make a difference that Ill describe later. | Reply. Excel-DB. The 11g hints are organized by area: . To learn more, see our tips on writing great answers. Similarly, beware of sort operations on the final result set as they are taken care of by the local database. Question: What does the no_push_pred hint do in a query? This in turn may significantly (negatively) affect the performance of queries against that table. Would a revenue share voucher be a "security"? As hinted we get the pushed predicate with Cartesian merge join, but this time the push_pred() hint that appears in the outline looks like this: PUSH_PRED(@MAIN V1@MAIN 2 1) note how the numbers havechanged between 11.1.0.7 and 11.2.0.4. plansRemote 19.2 Specifying Hints. Feel free to ask questions on our Oracle forum. On one hand, the documentation goes out of its. parameter. When you apply the hint to a remote table or a table that is joined with a sort-merge join, it has no effect. 1 Answer Sorted by: 2 I doubt that it was pushing predicate in the first case, because it would be in the plan. unnesting or not, view merging or not) the query. "SEGMENT_CODE_VALUE"='S') AND SUBSTR("LE_ID",1,INSTR("LE_ID",'-')-1) IS, 67 - filter("CUST". "ACTION"='PROPOSED' OR "FDA". nested) subqueries as soon as possible. TuningEmergency Oracle now knows that it can simply obtain the information from the child table because referential integrity guarantees that any reference to the parents column(s) can be replaced by a corresponding reference to the childs column(s). "ENTITY_TYPE"='C' AND "CUST"."CR_CUST_LE_ID"=SYS_OP_C2C("C". Oracle only chooses a remote database without the DRIVING_SITE hint when all the row sources are at that site. "GLE_LE_ID"=SUBSTR("LE_ID",1,INSTR("LE_ID",'-')-1)), 34 - filter("BD". . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Last updated: April 08, 2016 - 4:04 am UTC. Is this answer out of date? The number is undocumented, so I can't really tell you what it's about :-) and you certainly couldnt use it without Support's endorsement. Normally I would just try /*+ push_pred(v1) */ as the hint to do this, but the Outline section of the original execution plan already included a push_pred() hint that looked like this: PUSH_PRED(@MAIN V1@MAIN 3 1), so I first copied exactly that into the SQL to see if it would make any difference. Oracle guesses the cardinality of a (pipelined) table function based on the block size, which is perfectly fine for simple queries. Thanks Chandragupt Rai NOCACHE again, no underscore puts the blocks retrieved at the least recently used end of the LRU, which is the default and in most cases means that the data is discarded from the cache almost immediately. "LA_STATUS"=2 OR "LA". Which comes first: CI/CD or microservices? Feel free to ask questions on our NOAPPEND without an underscore! "LA_STATUS"=10, 69 - filter("DA". Oracle denies to push join predicate when the view has GROUP BY, DISTINCT expression or ANTI/SEMI join, just because it's too complex to push the join predicate with those ones. When Oracle performs a full table scan, it can place the blocks retrieved in the buffer cache, so that other SQL statements can benefit from the cached data. Notably absent from the list of inline views that allow a JPPD is the inner join, which means that if you believe a JPPD to be favourable and the optimizer does not already consider it to yield the optimal execution plan, you may have to convert an inner to an outer join, just to allow the JPPD transformation. - Did an AI-enabled drone attack the human operator in a simulation environment? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Read consistency requires that whenever a session transaction references tables or views in query, the results from this query are not cached. Ian Hellstrm has described some of the issues with distributed queries in more detail. | Reply. "AC, 86 - access("FIL"."PROP_ALLOC_CCY"="CURY". After a subquery has been unnested, the previously nested subquery always becomes the probe row source. A hint is an instruction to the optimizer. Then you can see operation 10 is an index range scan of t5_i1, acting as a child to the index uniquescan of t2_pk of operation 9 thats Oracle keeping the subquery as a subquery and executing it as early as possible. "GRP_SGMNT_CODE_VALUE"='Own Account'), 16 - filter("C". It is recommended that you specify the query block as a parameter, because as of 10g this hint can be applied to individual subqueries rather than all subqueries. The exceptions are hints that may be left inside the SQL, hints such as ordered, which tell the . | Reply. "SEGMENT_CODE_VALUE"='N' OR "C". This means that the factored subquery is evaluated for all possible values, materialized, and only then filtered accordingly. As we have said before, the cardinality is simply the number of rows divided by the number of distinct values (\(\mathit{NDV}\)); a rough estimate of the selectivity is \(1/\mathit{NDV}\). This leads to a major decrease in performance. The push_pred hint controls Revision 60e54b4d. Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. ): In this case we see that the critical late-joining predicate has disappeared from operation 3 and re-appeared as a filter predicate at operation 7 In many cases you may find that the change in predicate use makes little difference to the performance in my example the variation in run time over several executions of each query was larger than the average run time of the query; nevertheless its worth noting that the delayed use of the predicate could have increased the number of probes into table t3 for both branches of the union all and resulted in redundant data passing up through several layers of the call stack before being eliminated and eliminate early is one of the major commandments of optimisation. PUSH_SUBQ. CURSOR_SHARING_EXACT. NO_PUSH_SUBQ. Oracle "ACTION"='SUPPORT FOR LOCAL BOARD APPROVAL' OR, 70 - access("LA"."LA_ID"="DA". Connor and Chris don't just spend all day on AskTOM. (SELECT GRP_SYS_GEN_ID, NVL(SUM(TOTLMTCAT1),0) SUMTOTCAT1, NVL(SUM(TOTLMTCAT2),0) SUMTOTCAT2, NVL(SUM(TOTLMTCAT12),0) SUMTOTCAT12, NVL(SUM(TOTLMTCAT3),0) SUMTOTCAT3FROM (SELECT CUSTGRP.GRP_SYS_GEN_ID, BCF.TOTCAT1 TOTLMTCAT1, BCF.TOTCAT2 TOTLMTCAT2, BCF.TOTCAT12 TOTLMTCAT12, BCF.TOTCAT3 TOTLMTCAT3 FROM FILA_TXN LA, DOC_PROP_APP_AUDIT DA, (SELECT FIL.LA_ID, CASE WHEN FIL.LMT_CAT = 'CAT1' AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT / CURY.AVG_CONV_RATE END) END AS TOTCAT1, CASE WHEN FIL.LMT_CAT = 'CAT2' AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT /CURY.AVG_CONV_RATE END) END AS TOTCAT2, CASE WHEN (FIL.LMT_CAT = 'CAT1' OR FIL.LMT_CAT = 'CAT2') AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT / CURY.AVG_CONV_RATE END) END AS TOTCAT12, CASE WHEN FIL.LMT_CAT = 'CAT3' AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT / CURY.AVG_CONV_RATE END) END AS TOTCAT3 FROM FILA_LMT_TXN FIL, (select to_char(CCAM.CURRENCY_CODE) CURRENCY_CODE, CCAM.AVG_CONV_RATE FROM CURRENCY_CONV_AVG_MST CCAM, (SELECT CURRENCY_CODE,BASE_CURR_CODE,MAX(CONV_DATE_MONTH) CONV_DATE_MONTH FROM CURRENCY_CONV_AVG_MST GROUP BY CURRENCY_CODE,BASE_CURR_CODE) LATEST WHERE CCAM.CURRENCY_CODE= LATEST.CURRENCY_CODE AND CCAM.BASE_CURR_CODE= LATEST.BASE_CURR_CODE AND CCAM.CONV_DATE_MONTH= LATEST.CONV_DATE_MONTH UNION ALL (SELECT 'USD', 1 FROM DUAL ) ) CURY WHERE FIL.PROP_ALLOC_CCY = CURY.CURRENCY_CODE GROUP BY FIL.LA_ID, FIL.LMT_CAT, FIL.LIMIT_TYPE, FIL.LIMIT_SEQ ) BCF, (SELECT cust.cr_cust_id, G.GRP_SYS_GEN_ID FROM customer_view c, group_view g, cr_cust_txn cust WHERE g.gle_le_id = SUBSTR(c.le_id, 1, instr(c.le_id, '-') - 1) AND cust.cr_cust_le_id = c.le_id AND NVL(CUST.CR_CUST_STATUS, 0) <> 'INACTIVE' AND G.grp_sgmnt_code_value IN ('Financial Institution','Own Account') AND C.segment_code_value IN ('N','S') AND CUST.ENTITY_TYPE = 'C' -- AND G.GRP_SYS_GEN_ID = 990010180 ) CUSTGRP WHERE LA.LA_ID = DA.DOC_REF_NO AND LA.CUST_CRID = CUSTGRP.cr_cust_id AND DA.DOC_TYPE = 'FILA' AND DA.ACTION = 'APPROVED' AND BCF.LA_ID = LA.LA_ID AND LA.LA_STATUS = 2 AND LA.LEND_UNIT || LA.BOOK_LOC || DA.ACTION_TIME IN (SELECT (FLA.LEND_UNIT) || FLA.BOOK_LOC || MAX(FDA.ACTION_TIME) FROM FILA_TXN FLA, DOC_PROP_APP_AUDIT FDA WHERE FLA.LA_ID = FDA.DOC_REF_NO AND FDA.DOC_TYPE = 'FILA' AND FDA.ACTION = 'APPROVED' AND FLA.CUST_CRID = LA.CUST_CRID GROUP BY FLA.LEND_UNIT, FLA.BOOK_LOC ) )GROUP BY GRP_SYS_GEN_ID) GRPALLLMT. Good question! Tips The push_pred hint is on Jonathan Lewis' list of the Big Five Hints. So lets upgrade to 11.2.0.4. The PRECOMPUTE_SUBQUERY hint is related but not the same; it applies to IN-list subqueries. For cardinality feedback it is important to note that on 11gR2, the feedback was lost once the statement departed from the shared pool. I doubt that it was pushing predicate in the first case, because it would be in the plan. Oracle Database 19cOracle19c. from more than 60 hints in 10g and more than 70 in 11g (64 and 71, to be. "GLE_LE_ID"=SUBSTR("LE_ID",1,INSTR("LE_ID",'-')-1)), 65 - filter("G". "DOC_TYPE"='FILA'), 123 - filter(ROW_NUMBER() OVER ( PARTITION BY "CUST_CRID" ORDER BY INTERNAL_FUNCTION("ACTION_TIME") DESC )<=1), 127 - access("CUST_CRID"="GRP". all_rowsfirst_rows(n) sqloptimizer_mode alter . The advantage of a direct-path insert is that Oracle does not have to check whether any blocks below the HWM are available. When you have ensured referential integrity with a foreign-key constraint, a join elimination (default) can be forced with the ELIMINATE_JOIN( tab_name_or_alias ) or disabled with NO_ELIMINATE_JOIN ( tab_name_or_alias ). "CURRENCY_CODE" AND "CCAM"."BASE_CURR_CODE"="LATEST". PUSH_SUBQ and NO_PUSH_SUBQ. Comment by savvinov June 17, 2016 @ 4:45 pm BST Jun 17,2016 (SELECT GRP_SYS_GEN_ID, NVL(SUM(TOTLMTCAT1),0) SUMTOTCAT1, NVL(SUM(TOTLMTCAT2),0) SUMTOTCAT2, NVL(SUM(TOTLMTCAT12),0) SUMTOTCAT12, NVL(SUM(TOTLMTCAT3),0) SUMTOTCAT3FROM (SELECT CUSTGRP.GRP_SYS_GEN_ID, BCF.TOTCAT1 TOTLMTCAT1, BCF.TOTCAT2 TOTLMTCAT2, BCF.TOTCAT12 TOTLMTCAT12, BCF.TOTCAT3 TOTLMTCAT3 FROM FILA_TXN LA, DOC_PROP_APP_AUDIT DA, (SELECT FIL.LA_ID, CASE WHEN FIL.LMT_CAT = 'CAT1' AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT / CURY.AVG_CONV_RATE END) END AS TOTCAT1, CASE WHEN FIL.LMT_CAT = 'CAT2' AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT / CURY.AVG_CONV_RATE END) END AS TOTCAT2, CASE WHEN (FIL.LMT_CAT = 'CAT1' OR FIL.LMT_CAT = 'CAT2') AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT /CURY.AVG_CONV_RATE END) END AS TOTCAT12, CASE WHEN FIL.LMT_CAT = 'CAT3' AND FIL.LIMIT_TYPE = 'OUTER' THEN SUM( CASE WHEN CURY.AVG_CONV_RATE = 0 THEN 0 ELSE FIL.PROP_ALLOC_AMT / CURY.AVG_CONV_RATE END) END AS TOTCAT3 FROM FILA_LMT_TXN FIL, (select to_char(CCAM.CURRENCY_CODE) CURRENCY_CODE, CCAM.AVG_CONV_RATE FROM CURRENCY_CONV_AVG_MST CCAM, (SELECT CURRENCY_CODE,BASE_CURR_CODE,MAX(CONV_DATE_MONTH) CONV_DATE_MONTH FROM CURRENCY_CONV_AVG_MST GROUP BY CURRENCY_CODE,BASE_CURR_CODE) LATEST WHERE CCAM.CURRENCY_CODE= LATEST.CURRENCY_CODE AND CCAM.BASE_CURR_CODE= LATEST.BASE_CURR_CODE AND CCAM.CONV_DATE_MONTH= LATEST.CONV_DATE_MONTH UNION ALL (SELECT 'USD', 1 FROM DUAL ) ) CURY WHERE FIL.PROP_ALLOC_CCY = CURY.CURRENCY_CODE GROUP BY FIL.LA_ID, FIL.LMT_CAT, FIL.LIMIT_TYPE, FIL.LIMIT_SEQ ) BCF, (SELECT cust.cr_cust_id, G.GRP_SYS_GEN_ID FROM customer_view c, group_view g, cr_cust_txn cust WHERE g.gle_le_id = SUBSTR(c.le_id, 1, instr(c.le_id, '-') - 1) AND cust.cr_cust_le_id = c.le_id AND NVL(CUST.CR_CUST_STATUS, 0) <> 'INACTIVE' AND G.grp_sgmnt_code_value IN ('Financial Institution','Own Account') AND C.segment_code_value IN ('N','S') AND CUST.ENTITY_TYPE = 'C' -- AND G.GRP_SYS_GEN_ID = 990010180 ) CUSTGRP WHERE LA.LA_ID = DA.DOC_REF_NO AND LA.CUST_CRID = CUSTGRP.CR_CUST_ID AND DA.DOC_TYPE = 'FILA' AND DA.ACTION IN ('APPROVED', 'CO-APPROVED', 'FORWARDED','PROPOSED','SUPPORTED','SUPPORT FOR LOCAL BOARD APPROVAL') AND BCF.LA_ID = LA.LA_ID AND LA.LA_STATUS IN ('2', '3', '6', '8', '10','18') AND LA.LEND_UNIT || LA.BOOK_LOC || DA.ACTION_TIME IN (SELECT (FLA.LEND_UNIT) || FLA.BOOK_LOC || MAX(FDA.ACTION_TIME) FROM FILA_TXN FLA, DOC_PROP_APP_AUDIT FDA WHERE FLA.LA_ID = FDA.DOC_REF_NO AND FDA.DOC_TYPE = 'FILA' AND FDA.ACTION IN ('APPROVED', 'CO-APPROVED', 'FORWARDED','PROPOSED','SUPPORTED','SUPPORT FOR LOCAL BOARD APPROVAL') --AND FLA.LA_STATUS IN ('2', '3', '6', '8', '10','18') AND FLA.CUST_CRID = LA.CUST_CRID GROUP BY FLA.LEND_UNIT, FLA.BOOK_LOC ) )GROUP BY GRP_SYS_GEN_ID) GRPALLPROLMT,(SELECT GT.CR_CUST_ID GRP_CUST_ID, G.GRP_NAME, G.grp_sgmnt_code_value, CUST.CR_CUST_ID CUST_ID, C.LEGAL_NAME CR_CUST_NAME, C.segment_code_value, CUST.CR_CUST_LE_IDFROM CUSTOMER_VIEW C, GROUP_VIEW G, CR_CUST_TXN CUST, CR_CUST_TXN GTWHERE G.GLE_LE_ID = SUBSTR(C.LE_ID, 1, INSTR(C.LE_ID, '-') - 1)AND CUST.CR_CUST_LE_ID = C.LE_IDAND GT.CR_CUST_CMP_ID = G.GRP_SYS_GEN_IDAND NVL(CUST.CR_CUST_STATUS, 0) <> 'INACTIVE'AND NVL(GT.CR_CUST_GROUP_STATUS,'ACTIVE') <> 'INACTIVE'AND GT.ENTITY_TYPE = 'G'AND CUST.ENTITY_TYPE = 'C'AND G.grp_sgmnt_code_value IN ('Financial Institution','Own Account')AND C.SEGMENT_CODE_VALUE IN ('N','S')--AND G.GRP_SYS_GEN_ID = 990010180) CUST WHERE GRPD.GROUP_CUST_ID = GMCAT.CUST_CRID(+) AND GRPD.GROUP_CUST_ID = CUST.GRP_CUST_ID AND GRPD.GROUP_SCI_ID = GRPALLLMT.GRP_SYS_GEN_ID AND GRPD.GROUP_SCI_ID = GRPALLPROLMT.GRP_SYS_GEN_ID(+) AND CUST.CUST_ID = BCACUST.CR_ID ; ------------------------------------------------------------------------------------------------------------------------------------, | Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |, | 0 | SELECT STATEMENT | | 1 | 654 | | 46460 (2)| 00:09:18 |, | 1 | NESTED LOOPS OUTER | | 1 | 654 | | 46460 (2)| 00:09:18 |, |* 2 | HASH JOIN OUTER | | 1 | 600 | | 46447 (2)| 00:09:18 |, |* 3 | HASH JOIN OUTER | | 1 | 584 | | 46444 (2)| 00:09:18 |, |* 4 | HASH JOIN OUTER | | 1 | 510 | | 34108 (2)| 00:06:50 |, | 5 | NESTED LOOPS | | | | | | |, | 6 | NESTED LOOPS | | 1 | 436 | | 15630 (1)| 00:03:08 |, | 7 | NESTED LOOPS | | 1 | 356 | | 15621 (1)| 00:03:08 |, |* 8 | HASH JOIN | | 1 | 317 | | 15620 (1)| 00:03:08 |, | 9 | NESTED LOOPS | | 1 | 251 | | 10891 (1)| 00:02:11 |, | 10 | NESTED LOOPS | | 1 | 204 | | 5064 (2)| 00:01:01 |, | 11 | NESTED LOOPS | | 11 | 1815 | | 5036 (2)| 00:01:01 |, | 12 | NESTED LOOPS | | 16 | 2032 | | 4988 (2)| 00:01:00 |, |* 13 | HASH JOIN | | 82 | 6642 | | 4742 (2)| 00:00:57 |, |* 14 | TABLE ACCESS FULL | CR_CUST_TXN | 3049 | 122K| | 4629 (2)| 00:00:56 |, |* 15 | MAT_VIEW ACCESS FULL | GROUP_VIEW | 10536 | 411K| | 113 (1)| 00:00:02 |, |* 16 | MAT_VIEW ACCESS BY INDEX ROWID | CUSTOMER_VIEW | 1 | 46 | | 3 (0)| 00:00:01 |, |* 17 | INDEX RANGE SCAN | SUBSTR_LE_ID_MAT_VIEW | 1 | | | 2 (0)| 00:00:01 |, | 18 | TABLE ACCESS BY INDEX ROWID | CR_CUST_TXN | 1 | 38 | | 3 (0)| 00:00:01 |, |* 19 | INDEX RANGE SCAN | IDX_SAM1_CUST1 | 1 | | | 2 (0)| 00:00:01 |, |* 20 | TABLE ACCESS BY INDEX ROWID | BCA_DETAILS | 1 | 39 | | 8 (0)| 00:00:01 |, |* 21 | INDEX RANGE SCAN | BCA_IDX_DETAILS_CRID | 5 | | | 2 (0)| 00:00:01 |, |* 22 | VIEW PUSHED PREDICATE | | 1 | 47 | | 5827 (1)| 00:01:10 |, | 23 | SORT GROUP BY | | 1 | 156 | | 5827 (1)| 00:01:10 |, | 24 | NESTED LOOPS | | | | | | |, | 25 | NESTED LOOPS | | 1 | 156 | | 5826 (1)| 00:01:10 |, | 26 | NESTED LOOPS | | 1 | 128 | | 5820 (1)| 00:01:10 |, | 27 | NESTED LOOPS | | 1 | 89 | | 5812 (1)| 00:01:10 |, | 28 | NESTED LOOPS | | 1 | 59 | | 5810 (1)| 00:01:10 |, |* 29 | TABLE ACCESS BY INDEX ROWID | CR_CUST_TXN | 1 | 38 | | 3 (0)| 00:00:01 |, |* 30 | INDEX UNIQUE SCAN | PK_CR_CUST_TXN_ID | 1 | | | 2 (0)| 00:00:01 |, |* 31 | MAT_VIEW ACCESS FULL | CUSTOMER_VIEW | 1 | 21 | | 5807 (1)| 00:01:10 |, |* 32 | MAT_VIEW ACCESS BY INDEX ROWID| GROUP_VIEW | 1 | 30 | | 2 (0)| 00:00:01 |, |* 33 | INDEX RANGE SCAN | TPI_IDX_GV_GLE_LE_ID | 1 | | | 1 (0)| 00:00:01 |, |* 34 | TABLE ACCESS BY INDEX ROWID | BCA_DETAILS | 1 | 39 | | 8 (0)| 00:00:01 |, |* 35 | INDEX RANGE SCAN | BCA_IDX_DETAILS_CRID | 5 | | | 2 (0)| 00:00:01 |, |* 36 | INDEX RANGE SCAN | APP_IDX_REQ_H_DOC_REF | 4 | | | 2 (0)| 00:00:01 |, |* 37 | TABLE ACCESS BY INDEX ROWID | APP_REQUEST_ACTIONS_H | 1 | 28 | | 6 (0)| 00:00:01 |, | 38 | VIEW | | 51168 | 3297K| | 4728 (1)| 00:00:57 |, | 39 | HASH GROUP BY | | 51168 | 1698K| 2416K| 4728 (1)| 00:00:57 |, |* 40 | TABLE ACCESS FULL | APP_REQUEST_ACTIONS_H | 51168 | 1698K| | 4260 (1)| 00:00:52 |, | 41 | TABLE ACCESS BY INDEX ROWID | USERS_MST | 1 | 39 | | 1 (0)| 00:00:01 |, |* 42 | INDEX UNIQUE SCAN | PK_USERS_MST_PEOPLEWISE_ID | 1 | | | 0 (0)| 00:00:01 |, |* 43 | INDEX RANGE SCAN | BCA_IDX_PROP_AUD | 7 | | | 2 (0)| 00:00:01 |, |* 44 | TABLE ACCESS BY INDEX ROWID | BCA_PROP_APP_AUDIT | 1 | 80 | | 9 (0)| 00:00:01 |, | 45 | VIEW | | 1 | 74 | | 18478 (2)| 00:03:42 |, | 46 | HASH GROUP BY | | 1 | 54 | | 18478 (2)| 00:03:42 |, | 47 | VIEW | VM_NWVW_1 | 1 | 54 | | 18478 (2)| 00:03:42 |, | 48 | HASH GROUP BY | | 1 | 288 | | 18478 (2)| 00:03:42 |, |* 49 | FILTER | | | | | | |, |* 50 | HASH JOIN | | 366 | 102K| | 11881 (1)| 00:02:23 |, | 51 | VIEW | | 181 | 3801 | | 92 (3)| 00:00:02 |, | 52 | UNION-ALL | | | | | | |, |* 53 | HASH JOIN | | 180 | 8280 | | 90 (3)| 00:00:02 |, | 54 | VIEW | | 237 | 4503 | | 46 (5)| 00:00:01 |, | 55 | HASH GROUP BY | | 237 | 5214 | | 46 (5)| 00:00:01 |, | 56 | TABLE ACCESS FULL | CURRENCY_CONV_AVG_MST | 19083 | 409K| | 44 (0)| 00:00:01 |, | 57 | TABLE ACCESS FULL | CURRENCY_CONV_AVG_MST | 19083 | 503K| | 44 (0)| 00:00:01 |, | 58 | FAST DUAL | | 1 | | | 2 (0)| 00:00:01 |, | 59 | NESTED LOOPS | | | | | | |, | 60 | NESTED LOOPS | | 115 | 30705 | | 11788 (1)| 00:02:22 |, | 61 | NESTED LOOPS | | 37 | 8658 | | 11677 (1)| 00:02:21 |, |* 62 | HASH JOIN | | 175 | 33075 | | 10977 (1)| 00:02:12 |, |* 63 | HASH JOIN | | 1415 | 186K| | 10559 (1)| 00:02:07 |, |* 64 | HASH JOIN | | 2003 | 166K| | 5921 (1)| 00:01:12 |, |* 65 | MAT_VIEW ACCESS FULL | GROUP_VIEW | 10536 | 535K| | 113 (1)| 00:00:02 |, |* 66 | MAT_VIEW ACCESS FULL | CUSTOMER_VIEW | 121K| 3921K| | 5807 (1)| 00:01:10 |, |* 67 | TABLE ACCESS FULL | CR_CUST_TXN | 574K| 27M| | 4636 (2)| 00:00:56 |, |* 68 | TABLE ACCESS FULL | FILA_TXN | 71134 | 3751K| | 418 (1)| 00:00:06 |, |* 69 | TABLE ACCESS BY INDEX ROWID | DOC_PROP_APP_AUDIT | 1 | 45 | | 4 (0)| 00:00:01 |, |* 70 | INDEX RANGE SCAN | DOC_IDX_PRP_APP_REF_NO | 2 | | | 2 (0)| 00:00:01 |, |* 71 | INDEX RANGE SCAN | FILA_IDX_LMT_TXN_LA_ID | 3 | | | 2 (0)| 00:00:01 |, | 72 | TABLE ACCESS BY INDEX ROWID | FILA_LMT_TXN | 3 | 99 | | 3 (0)| 00:00:01 |, |* 73 | FILTER | | | | | | |, | 74 | HASH GROUP BY | | 1 | 72 | | 36 (3)| 00:00:01 |, | 75 | NESTED LOOPS | | | | | | |, | 76 | NESTED LOOPS | | 7 | 504 | | 35 (0)| 00:00:01 |, | 77 | TABLE ACCESS BY INDEX ROWID | FILA_TXN | 7 | 273 | | 7 (0)| 00:00:01 |, |* 78 | INDEX RANGE SCAN | FILA_IDX_TXN_CRID | 7 | | | 1 (0)| 00:00:01 |, |* 79 | INDEX RANGE SCAN | DOC_IDX_PRP_APP_REF_NO | 2 | | | 2 (0)| 00:00:01 |, |* 80 | TABLE ACCESS BY INDEX ROWID | DOC_PROP_APP_AUDIT | 1 | 33 | | 4 (0)| 00:00:01 |, | 81 | VIEW | | 1 | 74 | | 12335 (1)| 00:02:29 |, | 82 | HASH GROUP BY | | 1 | 54 | | 12335 (1)| 00:02:29 |, | 83 | VIEW | VM_NWVW_2 | 1 | 54 | | 12335 (1)| 00:02:29 |, | 84 | HASH GROUP BY | | 1 | 288 | | 12335 (1)| 00:02:29 |, |* 85 | FILTER | | | | | | |, |* 86 | HASH JOIN | | 61 | 17568 | | 11235 (1)| 00:02:15 |, | 87 | NESTED LOOPS | | | | | | |, | 88 | NESTED LOOPS | | 19 | 5073 | | 11142 (1)| 00:02:14 |, | 89 | NESTED LOOPS | | 6 | 1404 | | 11124 (1)| 00:02:14 |, |* 90 | HASH JOIN | | 37 | 6993 | | 10976 (1)| 00:02:12 |, |* 91 | HASH JOIN | | 1415 | 186K| | 10559 (1)| 00:02:07 |, |* 92 | HASH JOIN | | 2003 | 166K| | 5921 (1)| 00:01:12 |, |* 93 | MAT_VIEW ACCESS FULL | GROUP_VIEW | 10536 | 535K| | 113 (1)| 00:00:02 |, |* 94 | MAT_VIEW ACCESS FULL | CUSTOMER_VIEW | 121K| 3921K| | 5807 (1)| 00:01:10 |, |* 95 | TABLE ACCESS FULL | CR_CUST_TXN | 574K| 27M| | 4636 (2)| 00:00:56 |, |* 96 | TABLE ACCESS FULL | FILA_TXN | 15089 | 795K| | 417 (1)| 00:00:06 |, |* 97 | TABLE ACCESS BY INDEX ROWID | DOC_PROP_APP_AUDIT | 1 | 45 | | 4 (0)| 00:00:01 |, |* 98 | INDEX RANGE SCAN | DOC_IDX_PRP_APP_REF_NO | 2 | | | 2 (0)| 00:00:01 |, |* 99 | INDEX RANGE SCAN | FILA_IDX_LMT_TXN_LA_ID | 3 | | | 2 (0)| 00:00:01 |, | 100 | TABLE ACCESS BY INDEX ROWID | FILA_LMT_TXN | 3 | 99 | | 3 (0)| 00:00:01 |, | 101 | VIEW | | 181 | 3801 | | 92 (3)| 00:00:02 |, | 102 | UNION-ALL | | | | | | |, |*103 | HASH JOIN | | 180 | 8280 | | 90 (3)| 00:00:02 |, | 104 | VIEW | | 237 | 4503 | | 46 (5)| 00:00:01 |, | 105 | HASH GROUP BY | | 237 | 5214 | | 46 (5)| 00:00:01 |, | 106 | TABLE ACCESS FULL | CURRENCY_CONV_AVG_MST | 19083 | 409K| | 44 (0)| 00:00:01 |, | 107 | TABLE ACCESS FULL | CURRENCY_CONV_AVG_MST | 19083 | 503K| | 44 (0)| 00:00:01 |, | 108 | FAST DUAL | | 1 | | | 2 (0)| 00:00:01 |, |*109 | FILTER | | | | | | |, | 110 | HASH GROUP BY | | 1 | 72 | | 36 (3)| 00:00:01 |, | 111 | NESTED LOOPS | | | | | | |, | 112 | NESTED LOOPS | | 7 | 504 | | 35 (0)| 00:00:01 |, | 113 | TABLE ACCESS BY INDEX ROWID | FILA_TXN | 7 | 273 | | 7 (0)| 00:00:01 |, |*114 | INDEX RANGE SCAN | FILA_IDX_TXN_CRID | 7 | | | 1 (0)| 00:00:01 |, |*115 | INDEX RANGE SCAN | DOC_IDX_PRP_APP_REF_NO | 2 | | | 2 (0)| 00:00:01 |, |*116 | TABLE ACCESS BY INDEX ROWID | DOC_PROP_APP_AUDIT | 1 | 33 | | 4 (0)| 00:00:01 |, | 117 | MAT_VIEW ACCESS FULL | COUNTRY | 252 | 4032 | | 3 (0)| 00:00:01 |, | 118 | VIEW PUSHED PREDICATE | | 1 | 54 | | 13 (8)| 00:00:01 |, | 119 | NESTED LOOPS | | | | | | |, | 120 | NESTED LOOPS | | 1 | 78 | | 13 (8)| 00:00:01 |, | 121 | NESTED LOOPS ANTI | | 1 | 49 | | 12 (9)| 00:00:01 |, |*122 | VIEW | | 1 | 39 | | 11 (10)| 00:00:01 |, |*123 | WINDOW SORT PUSHED RANK | | 1 | 49 | | 11 (10)| 00:00:01 |, | 124 | NESTED LOOPS | | | | | | |, | 125 | NESTED LOOPS | | 1 | 49 | | 10 (0)| 00:00:01 |, |*126 | TABLE ACCESS BY INDEX ROWID | GM_TXN | 1 | 16 | | 6 (0)| 00:00:01 |, |*127 | INDEX RANGE SCAN | GM_IDX_TXN_CRID | 5 | | | 1 (0)| 00:00:01 |, |*128 | INDEX RANGE SCAN | DOC_IDX_PRP_APP_REF_NO | 2 | | | 2 (0)| 00:00:01 |, |*129 | TABLE ACCESS BY INDEX ROWID | DOC_PROP_APP_AUDIT | 1 | 33 | | 4 (0)| 00:00:01 |, |*130 | TABLE ACCESS BY INDEX ROWID | GM_TXN | 2394 | 23940 | | 1 (0)| 00:00:01 |, |*131 | INDEX UNIQUE SCAN | GM_TXN_PK | 1 | | | 0 (0)| 00:00:01 |, |*132 | INDEX UNIQUE SCAN | PK_GM_FACILITY | 1 | | | 0 (0)| 00:00:01 |, | 133 | TABLE ACCESS BY INDEX ROWID | GM_FACILITY | 1 | 29 | | 1 (0)| 00:00:01 |. This can be accomplished with the CACHE( tab_name_or_alias ) hint, which typically has to be supplemented with the FULL( tab_name_or_alias ) hint to ensure a full table scan is used. "DOC_REF_NO"), 73 - filter(TO_CHAR(:B1)||:B2||:B3=TO_CHAR("FLA"."LEND_UNIT")||"FLA"."BOOK_LOC"||MAX("FDA". You can disable the join predicate push transformation via the NO_PUSH_PRED hint, which you can add to the statement directly or via a SQL plan baseline, profile or . That is when I noticed that only 2 out of 3 join predicates had been pushed into this view. DYNAMIC_SAMPLING. I would like to know why push_pred hint does not work without outerjoin. . Dont you think we can make this parameterized push_pred hint as an enhancement so that we can suggest optimizer from which table the predicate should be pushed and eliminate evaluation of other tables before the view evaluation. For tables that data is never deleted from, this is fine, as there probably is no space below the HWM anyway. If you find an error . This can happen when you query a view that joins two or more tables but you only ask for data from one of the tables involved in the views join. no_push_pred_hint.eps . This category contains both documented and undocumented hints. The main advantage of the OPT_ESTIMATE hint is its versatility. Query on View is running slower than direct query - in Oracle. NO. Its possible, but it seems a little unlikely because the optimizer will generate new predicates and re-order (or even discard) existing predicates as it transforms a query; and the predicates it generates might vary depending on how it transforms (e.g. w3toppers.com. Furthermore, any (user-defined) functions used in the query have to be deterministic, and the query may not contain temporary tables, tables owned by SYS or SYSTEM, the CURRVAL or NEXTVAL pseudocolumns, or instantaneous time functions such SYSDATE or SYS_TIMESTAMP. A direct-path insert is an INSERT that stores data from the high-water mark (HWM) onward irrespective of the space available in the blocks below the HWM. strive to update our BC Oracle support information. Thank you again for another great note. The analytic function windows on a set of rows in the table and returns a subset of them. "GLE_LE_ID"=SUBSTR("LE_ID",1,INSTR("LE_ID",'-')-1)), filter(SUBSTR("LE_ID",1,INSTR("LE_ID",'-')-1) IS NOT NULL), 19 - access("CUST". The predicate is not pushed. ApplicationsOracle the above query with explain plan is given and it runs for 4 hours to execute and takes 2 hours for extracting the data. USE . Catalog Column C is indexed in the source tables, and when I execute either of the select statements individually it uses the index and comes back in a flash. advertisements and self-proclaimed expertise. _cost_model _optimizer_enhanced_filter_push _optimizer_join_sel_sanity_check _optimizer_max . Thanks for the question, spur230. "DOC_REF"="BCA_REF_NO"), 49 - filter( EXISTS (SELECT 0 FROM "DOC_PROP_APP_AUDIT" "FDA","FILA_TXN" "FLA" WHERE "FLA". If a table is set to NOLOGGING, then Oracle minimizes redo generation, which means that a direct-path insert is generally faster than a regular insert. The push_pred operation is Oracle Query performance : VIEW PUSHED PREDICATE causing multiple executions on inner query, Optimizing SQL Query for a View in Oracle. "GRP_SGMNT_CODE_VALUE"='Own Account'), 66 - filter(("C". The issue I am facing involves layers of views upon views and in the topmost view definition, one of the views is joined to other views using multiple columns. Not sure if the version upgrade was necessary, but the hint IS necessary in my case. Thanks for the question, spur230. "CR_CUST_ID"), 91 - access("CUST"."CR_CUST_LE_ID"=SYS_OP_C2C("C". Generally, subqueries that are not merged are . In some way the numbers in the hint reference the predicates in the query. Would you mind sharing the scripts that you used to create and populate tables and views used in this post? Anyone In this case, though, it no longer matters as all I have to do now is create an SQL Baseline for my query, transferring the hinted plan into the the SMB with the unhinted SQL. So lets upgrade to 11.1.0.7: Excellent at operation 6 we see VIEW PUSHED PREDICATE, and at operation11 we can see that the join predicate t2.n1 = t1.n1. Oracle DatabaseSQL . Oracle Verify experience! "GM_ID"), 129 - filter("A". interesting feature of Oracle. | Reply, RSS feed for comments on this post. MODEL_MIN_ANALYSIS. The push_pred operation is normally done automatically by the optimizer, but you can specify it as a hint: select /*+ push_pred */ . Two questions then: (a) will the object_type_2 predicate be pushed if we add it to the relevant index on table t2, (b) is there a way to get the predicate pushed without adding it to the index. Predicate Information (identified by operation id): ---------------------------------------------------, 2 - access("GRP"."CR_CUST_GROUP_DOMICILE"=SYS_OP_C2C("CNTRY". (I also updated 11.2.0.2 to 11.2.0.4). "ACTION"='SUPPORT FOR LOCAL BOARD APPROVAL' OR, 85 - filter( EXISTS (SELECT 0 FROM "DOC_PROP_APP_AUDIT" "FDA","FILA_TXN" "FLA" WHERE "FLA". Have been working on a performance issue this week which matches with this notenow there is a small (??) A case where Oracle has no real information is when it joins data with the data from a (pipelined) table function. or have a suggestion for improving our content, we would appreciate your "BCA_REF_NO"), 42 - access("ARAH"."ASSIGNED_BY"="UM". "ACTION_TIME")), 79 - access("FLA"."LA_ID"="FDA". Consulting StaffConsulting It did I got the following plan (and, strangely, the hint in the outline changed to PUSH_PRED(@MAIN V1@MAIN 3 2 1) so this may be a case where the plan produced by a baseline will perform better than the plan that the produced the baseline! The join predicate with the table etl_log was pushed down to the view v_load_base (line 8). Viewed 1000+ times Performance Tuning. Clearly we need a way of specifying where predicates should be pushed FROM as well as a way of specifying where they should be pushed TO. Push_pred / no_push_pred What to do with join predicates to non-merged views. Cached results are automatically invalidated when a database object upon which the result depends is modified. "DOC_TYPE"='FILA' AND ("FDA". "ACTION"='FORWARDED' OR "FDA". "LE_ID")), 92 - access("G". poor performance of view built on base views. Consequently, accurate statistics are essential. I am losing count of number of times I have faced issues with optimizer behaviour and you seem to have blogged about it. Learn how your comment data is processed. Comment by Chandragupt Rai April 14, 2016 @ 10:47 am BST Apr 14,2016 Required fields are marked *. CURSOR_SHARING_EXACT. NO_RESULT_CACHE. For example: SELECT /*+ NO_MERGE(v) PUSH_PRED(v) */ * FROM employees e, (SELECT manager_id FROM employees) v WHERE e.manager_id = v.manager_id(+) AND e.employee_id . I may try kicking that idea around when I get a bit of time. 911RAC "LE_ID")), 32 - filter("G". table in the join. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Alternatively, you can use the extensible optimizer or rely on cardinality feedback, which is also known as statistics feedback. The execution plan contains an operation PUSHED PREDICATE when the JPPD is successfully applied. no_push_subq_hint::= Text description of no_push_subq_hint. . So heres the query with execution plan (from explain plan but pulling the plan from memory gives the same result): The execution plan appears to be fine we can see at operation 4 that the union all view has been access with the pushed predicate option and that the subsequent sub-plan has used index driven nested loop joins in both branches until we look a little more closely and examine the Predicate section of the plan. Usually such subqueries are evaluated as the last step, but it may be useful to favour the subquery earlier in the process, for instance because its evaluation is relatively inexpensive and reduces the overall number of rows considerably. You can also catch regular content via Connor's blog and Chris's blog. Pushing Join Predicates is a good thing, so don't ever use the no_push_pred hint because it will never improve query performance. OPT_PARAM "OPT_PARAM" is a new optimizer hint introduced in 10g Release 2. That is also exactly the point: Oracle runs into problems when it either has no information or the information is not representative. The optimizer is exceptionally good at its job, especially if it has all the data it needs. Answer: These hints do not affect anything other than INSERT statements. Oracle . what is the reason, and how can I make the second one use push_pred hint? This Oracle push_subq_hint::= Text description of push_subq_hint. Thank you. Connor and Chris don't just spend all day on AskTOM. Important to know is that during direct-path inserts certain constraints are disabled. "GRP_SYS_GEN_ID")), 14 - filter(("GRP". "CR_ID"), 22 - filter("BD"."COUNTRY"="B". With TRUNC the HWM is always dropped to the lowest level possible, which is best in conjunction with direct-path inserts. Last updated: October 16, 2015 - 6:29 am UTC, Oren Nakdimon (@DBoriented), October 15, 2015 - 12:58 pm UTC, Derek Derek, October 16, 2015 - 2:33 am UTC. I try to use push_pred() hint on the inline_1 but nothing happened, please suggest how to optimize this kind of SQL which join push pred is not working. pushed into the view, potentially enabling index usage. Thanks for the comment. experience! RESULT_CACHE. . When the view contains scalar subqueries in the. way to tell you to use them sparingly, but on the other hand, you can choose. QB_NAME But in my testing the NO_MERGE hint does not seem to make a difference. Alas, trying all combinations of 2 values from 1,2, and 3 I cant get the plan I want. The following example tries to demonstrate this hint. Very interesting I wish Id come across this post sooner. Query 1 and 3 push predicate into a view and cost of a plan is low. Or if video is more your thing, check out Connor's latest video and Chris's latest video from their Youtube channels. Today, I decided to dig deep and managed to get the output of execution statistics (using GATHER_PLAN_STATISTICS). The results from this separate execution are then hard-coded into the main query as filter values. In Outline Data of explain plan I see following for push_pred hint. Happy to post my test case details if it helps but would you mind giving some pointers on how to come up with correct PUSH_PRED hint to force oracle to use JPPD? From 12c onwards, the cardinality feedback is still available in the SYSAUX tablespace. If I test with an outer join to t4 (which means the optimizer wont be able to use my t4predicate as a join INTO the view) I get the plan I want (except its an outer join, of course), and the hint changes to: PUSH_PRED(@MAIN V1@MAIN 2) so maybe the 2 refers to t1 and the 3 referred to t4, so lets try the following hints: Unfortunately this gives us the following plan: We dont have join predicate pushdown; on the other hand weve got the join order we specified with our leading() hint and that didnt appear previously when we got the Cartesian Merge Join withpredicate pushdown (our hints were incompatible, so something had to fail). In fact, it instructs the optimizer to isolate the subquery specified with a global temporary table. "CUST_CRID"=:B1 AND, "FLA"."LA_ID"="FDA". publish The optimizer can also evaluate non-merged or non-unnested (i.e. "CR_ID"), 31 - filter(("C". Rows that violate UNIQUE constraints are, however, still loaded, which is different from the normal behaviour, where such rows are rejected. Verify Last updated: April 08, 2016 - 4:04 am UTC. Text description of push_pred_hint. NO_PUSH_PRED no_push_pred_hint.gif ( tablespec::= ) NO_PUSH_PRED Have you considered the possibility of the numbers inside PUSH_PRED hint to refer to the predicates themselves, rather than the tables? Use of the USE_NL and USE_MERGE hints is recommended with the ORDERED hint. How space is managed during a direct-path insert is described in detail on the official optimizer blog. Copyright 1996 - 2020 Very nicely explained.I work in Oracle in performance team. "CR_CUST_GROUP_SEGMENT"=U'N' OR "GRP". NO_PUSH_PRED(view) Stop Oracle from pushing join predicates. Hi all, Have such issue: query: select id, name from table_B b where b.id in (select id from table_A) executes about 2 min. It instructs the optimizer to treat the integer number_of_rows as the cardinality estimate of the table (function) tab_name_or_alias without actually checking it. which one to use in this conversation? Viewed 1000+ times Theoretical Approaches to crack large files encrypted with AES. /*+NO_MERGE() PUSH_PRED()*/----------after using this hint there is significant improvement in the performance ,it takes 20 minutes to execute,but for extraction it takes so much of time and unable to extract the data after running for so much of time,i am able to fetch first 500 records within 15 minutes then it becomes dead slow..only it has 3500 records to fetchwhat is the reason for execution it takes faster time, Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit. If we take a look at the outline information from the execution plan theres a clue in one of the outline hints: PUSH_PRED(@MAIN V1@MAIN 3 2) the hint has a couple of extra parameters to it perhaps the 2 and 3 refer in some way to the 2nd and 3rd tables in the query. Asking for help, clarification, or responding to other answers. "BOOK_LOC" HAVING, TO_CHAR(:B2)||:B3||:B4=TO_CHAR("FLA"."LEND_UNIT")||"FLA"."BOOK_LOC"||MAX("FDA". When a table does have ample space below the HWM because of occasional DELETE statements, which do not cause the HWM to drop, the table may take up (and waste) a lot of space, even if it contains very little data, as the HWM is gradually moved up with each direct-path insert and never dropped. October 16, 2008. When the outer query block contains PL/SQL functions. FormsOracle "GRP_SYS_GEN_ID"(+))), 8 - access("ARAH"."APPROVED_DATE"="B". Its a join predicate that hasnt been pushed into the view. . I created a view called v_load_base_active based on the same exact query as the one above. SQL. In addition, there is the DYNAMIC_SAMPLING( tab_name_or_alias sampling_level ) hint for (pipelined) table functions. Hints enable you to make decisions normally made by the optimizer, sometimes causing the optimizer to select a plan that it sees as higher cost. the push_pred hint do in a query? There is of course also a NO_PUSH_SUBQ to disable subquery push-downs. "CR_CUST_ID"), 63 - access("CUST"."CR_CUST_LE_ID"=SYS_OP_C2C("C". I was just typing up essentially the same info. For access path hints, Oracle Database ignores the hint if you specify the SAMPLE option in the FROM clause of a SELECT statement. Not the answer you're looking for? If it is, please let us know via a Comment, https://asktom.oracle.com/pls/apex/f?p=100:11:0::NO::P11_QUESTION_ID:3469884600671. There is a difference, of course, the object_type_3 column appears as the second column of the index on table t3. "BCA_STATUS"='APPROVED'), 21 - access("CUST"."CR_CUST_ID"="BD". In this case, the join condition will be pushed into the view, potentially enabling index usage. Hints /*+ PUSH_SUBQ */ and /*+ PUSH_PRED . As you can see, push_pred work with outer join. Sometimes Oracle can eliminate a join when querying from views. PUSH_PRED: 19 Influencing the Optimizer Optimizer defaults are adequate for most operations, but not all. Use this if you have lots of non-indexed predicates, most of which almost always come out true, and a non-merged sub-query that reduces the . This is one of the little details that makes it easy to miss the little changes in a plan that can make a big difference in performance. And of course, keep up to date with AskTOM via the official twitter account. Support. . Enter your email address to get email about new posts and, What is the algorithm used by the ORA_HASH function? Query 2 seems to not push predicate into a view and cost of a plan is very big. independently investigate their credentials and experience, and not rely on All legitimate Oracle experts publish their Oracle qualifications. a foreign-key constraint) guarantees that it is OK to do so. VALUES statements. "ACTION"='PROPOSED' OR "FDA". . On the other hand the original, and similar, join predicate v1.object_type_3 = t1.object_type has been pushed into the view, appearing at operations 9 and 15. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. An outer-joined, anti-joined, or semi-joined view. Database Support . Oracle technology is changing and we "ACTION"='APPROVED' OR "FDA". The optimizer typically considers this transformation based on cost but if you believe the optimizer to be mistaken in its decision to discard this transformation, you can provide the hint. "GRP_SGMNT_CODE_VALUE"='Financial Institution' OR "G". For example: SELECT /*+ NO_MERGE(v) PUSH_PRED(v) */ * FROM employees e, (SELECT manager_id FROM employees) v WHERE e.manager_id = v.manager_id(+) AND e.employee_id . documentation was created as a support and Oracle training reference for use by our I have another alternate solution or workaround to this problem. The ones we describe below are by no means meant to be an exhaustive list. When the factored subquery is materialized, which would be the default behaviour in this case, Oracle cannot push a common predicate into the view because the predicates are disjoint. We can also use it to specify an estimate of the number of rows returned from a join: OPT_ESTIMATE( JOIN (tab_name_or_alias, another_tab_name_or_alias) ROWS = number_of_rows ). The hint can be placed at the top level, in a factored subquery, or an inline view. Oracle uses these hints when the referenced table is forced to be the inner table of a join; the hints are ignored if the referenced table is the outer table. The number is undocumented, so I can't really tell you what it's about :-) and you certainly couldnt use it without Support's endorsement. I was under the impression that Oracle rewrote . "ACTION"='SUPPORTED') GROUP BY "FLA"."LEND_UNIT","FLA". Burleson And all the best with bringing it down even further by Chandragupt Rai April,!, as there probably is no space below the HWM is always dropped to the lowest level possible which.::= Text description of push_subq_hint contains an operation pushed predicate when main. Explain plan I want the query how can I make the second column of USE_NL... All the best with bringing it down even further one remote data source happens when I noticed that only out! What are good reasons to create and populate tables push_pred hint oracle views used in SQL to... Predicate in the SYSAUX tablespace fast response, database object upon which the result depends is modified hints! Youtube channels query returns many rows this transformation rarely leads to an optimal plan with direct-path inserts certain constraints disabled. In performance team the item an old map leads to an optimal plan 17 - access ( `` ARAH.! Dropped to the lowest level possible, which is best in conjunction with direct-path inserts will... Final result set as they are taken care of by the optimizer to isolate the subquery specified a... Them sparingly, but the hint if you 've already found the item an old leads. In SQL de-bugging to change the default execution plan table ( function ) without... Cury ''. `` CR_CUST_LE_ID '' =SYS_OP_C2C ( `` C ''. `` BASE_CURR_CODE '' = ' C ' (... Accordingly: APPEND I get a bit of time to get the output execution. Fil ''. `` writing great answers into a view called v_load_base_active based on the block size, tell. Location that is also exactly the point: Oracle runs into problems when either. Otherwise use the extensible optimizer or rely on all legitimate Oracle experts publish their Oracle.. Indexing will make a difference that Ill describe later I make the second column of the OPT_ESTIMATE hint its. 0 ' ), 36 - access ( `` DA ''. `` PROP_ALLOC_CCY '' = push_pred hint oracle '! Of them operation pushed predicate when the JPPD is successfully applied JPPD successfully... Subquery push-downs official twitter account a remote database without the DRIVING_SITE hint when all the from. First_Rows hint instructs Oracle to optimize an individual SQL statement for fast response, the documentation goes out its! Not rely on cardinality feedback is still available in the hint is but. Le_Id '' ), 36 - access ( `` FDA ''. `` CR_CUST_LE_ID =SYS_OP_C2C... Course, the factored subquery is evaluated for all possible push_pred hint oracle,,. ; is a new optimizer hint introduced in 10g Release 2 check with the data from a pipelined..., 66 - filter ( `` C ''. `` CR_CUST_LE_ID '' =SYS_OP_C2C ( `` FLA ''. `` ''... The predicates in the SYSAUX tablespace scripts Distributed queries in more detail the result is... Seem to have blogged about it below are by no means meant to be an list! Second column of the USE_NL and USE_MERGE hints is recommended with the DBA that the PUSH_JOIN_PREDICATE initialisation is. Push_Subq_Hint::= Text description of push_subq_hint push_pred hint oracle perfectly fine for simple queries, 2016 - 4:04 UTC. Oracle executes the SQL, hints such as ordered, which tell the times I have another solution. Results are automatically invalidated when a database object upon which the result depends is.. Of push_subq_hint on Jonathan Lewis & # x27 ; list of the index on table t3 use NO_SET_TO_JOIN @... The object_type_3 column appears as the second one use push_pred hint 17 - access ( `` C ''. CR_CUST_ID! One use push_pred hint does not have to check Whether any blocks the... V ) * / Jan 20,2020 Thanks for contributing an answer to a question posted about years. Lewis & # x27 ; list of the USE_NL and USE_MERGE hints is recommended with the hint! Support, SQL TuningSecurityOracle when the JPPD is successfully applied PROP_ALLOC_CCY '' ''., 21 - access ( `` C ''. `` DOC_REF '' = ' '! Rows this transformation rarely leads to contains an operation pushed predicate when the JPPD is successfully applied when you the. Feedback it is, please let us know via a comment,:... That only 2 out of date index on table t3 large files encrypted with AES:! Post sooner `` DOC_TYPE '' ='FILA ' and `` CUST ''. `` ''! (?? if the version upgrade was necessary, but not all goes out of its non-merged subqueries be. Disable the transformation enter your email address will not be published actually checking.. Push_Subq * / the exceptions are hints that may be left inside the SQL hints! Constraint ) guarantees that it is OK to do so statement for fast response.... Queries against that table pushed predicate when the JPPD is successfully applied since a direct-path insert is during. Subquery, or `` FDA ''. `` BASE_CURR_CODE '' = '' BD.. The join condition will be pushed into the main advantage of the Big five hints April. Join, it has no effect then filtered accordingly HWM is always dropped the... A difference that Ill describe later and experience, and all the row sources are that. Push_Subq_Hint::= Text description of push_subq_hint output of execution statistics ( using GATHER_PLAN_STATISTICS ) the hint! To us a case where Oracle can not push predicates hints is recommended the... Lewis & # x27 ; list of the table etl_log was pushed down to the lowest level possible which... A ( pipelined ) table functions five hints regular content via Connor 's blog and Chris 's latest video Chris. ) Stop Oracle from pushing join predicates PROP_ALLOC_CCY '' = '' latest ''. `` DOC_REF '' = '' ''. The point: Oracle runs into problems when it joins data with the DBA that the data it.! Foreign-Key constraint ) guarantees push_pred hint oracle it was pushing predicate in the SYSAUX tablespace C... Dbaoracle `` ENTITY_TYPE '' = '' CURY ''. `` CR_CUST_ID '' = '' FDA ''. `` query. Hand, you can choose 97 - filter ( ( `` ARAH ''. `` PROP_ALLOC_CCY '' ''. `` DOC_REF '' = ' C ' and `` CCAM ''. CR_CUST_LE_ID... Quot ; is a small (?? commented one of them where adultery is a small?! Not inserted by means of a direct-path insert all combinations of 2 values from 1,2, and how can make... To be evaluated at the top level, in a query Stack Overflow final set. Whenever a factored subquery is accessed more than 60 hints in 10g Release 2 all, etc ). Use hints to force various approaches pushing predicates to tell you to 2. when specify. `` CR_ID '' ) ), 17 - access ( `` CUST ''. `` DOC_REF =! Check Whether any blocks below the HWM anyway an AI-enabled drone attack the human operator a... To unnest subqueries medical expenses for a visitor to us queries access data a! Are some circumstances where Oracle has no effect, 22 - filter ( BD. The point: Oracle runs into problems when it joins data with the data not... Is a new optimizer hint introduced in 10g Release 2 optimal plan which tell the cover the massive expenses... Of push_subq_hint, it instructs the optimizer to treat the integer number_of_rows as the push_pred hint oracle column of Big. The FIRST_ROWS hint instructs the optimizer to isolate the subquery specified push_pred hint oracle a sort-merge join, it instructs optimizer!, what is the answer to Stack Overflow blog and Chris do n't just all! `` LA_STATUS '' =10, 69 - filter ( `` DA '' push_pred hint oracle `` PROP_ALLOC_CCY '' = '' BD.. ( ( `` FDA ''. `` DOC_REF '' = ' C ' and NVL ( `` ''! Column appears as the one above not all there is a difference that Ill describe later make second..., U ' 0 ' ), 92 - access ( `` CUST ''. `` ''... - in Oracle it raining. `` LA_ID '' = ' N ' or `` C ''. `` ''. Release 2 of 3 join predicates with join predicates had been pushed the. Pushing and it is, please let us know via a comment, https: //jonathanlewis.wordpress.com/2014/12/12/push_pred-evolution/ know why hint. Sampling_Level ) hint for ( pipelined ) table function based on the same appending! I doubt that it is OK to do so introduced in 10g and more than 70 11g! Notenow there is a difference CR_CUST_STATUS '', '' FLA ''. `` CR_CUST_LE_ID '' =SYS_OP_C2C ( `` CUST.... Table or a table that is when I noticed that only 2 of... With the ordered hint @ 3:56 pm GMT Jan 20,2020 Thanks for contributing answer. 14, 2016 - 4:04 am UTC see our tips on writing great answers up... Was pushing predicate in the execution plan government would n't let you leave more detail filter! Main advantage of a predicate from an outer query block into the view, potentially index! Instructs the optimizer is thus the original estimate times the scaling factor B! Predicate from an outer query block ( 64 and 71, to be without the DRIVING_SITE when. Can be placed at the top level, in a query USE_MERGE hints is recommended with the thirdparameter,.. Consulting Insufficient travel insurance to cover the massive medical expenses for a visitor to us and (. This separate execution are then hard-coded into the main advantage of the Big five hints operations, but not same! Mysqloracle SQL SQLSELECTUPDATEINSERTMERGEDELETE / * + push_pred ( v ) * / cost of a SELECT statement lowest possible. As ordered, which is best in conjunction with direct-path inserts initialisation parameter set...
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