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POAdvices/tips on optimizing an Oracle SQL query executing on significant volumes
 

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  1. POAdvices/tips on optimizing an Oracle SQL query executing on significant volumes
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    <p>Don't run just after seeing the Oracle SQL query below ! :)</p> <p>I put the complete query in ordrer to ask for some advices on optimizations. I used the Oracle explain plan tool to help me identify some ways of optimizations but I'm quite stuck with it. Could you give me some advices/tips/good practices/ on potential optimizations of this query ?</p> <p>Facts :</p> <ul> <li>Tables PERSONNE and AFFAIRE contains about 1 million rows</li> <li>Table EVENEMENT contains about 30 millions rows</li> </ul> <p>Thanks in advance !</p> <pre><code>SELECT COUNT(*) FROM( (SELECT DISTINCT PER_ID FROM ( SELECT evt.PER_ID, MAX(evt.EVT_DATE_UPDATE) DMAX FROM EVENEMENT evt, PERSONNE per WHERE per.PER_ID = evt.PER_ID AND (per.PER_SI_DECES &lt;&gt; 1) GROUP BY evt.PER_ID) dos WHERE NOT EXISTS ( SELECT 1 FROM AFFAIRE aff, PRISE_EN_CHARGE pec WHERE dos.PER_ID = aff.PER_ID AND aff.AFF_ID = pec.AFF_ID AND pec.PEC_ETAT = 'A') AND DMAX &lt; ADD_MONTHS(SYSDATE,-60) ) UNION (SELECT per.PER_ID FROM PERSONNE per WHERE per.PER_SI_DECES = 1 AND NOT EXISTS ( SELECT 1 FROM AFFAIRE aff, PRISE_EN_CHARGE pec WHERE per.PER_ID = aff.PER_ID AND aff.AFF_ID = pec.AFF_ID AND pec.PEC_ETAT = 'A') AND EXISTS ( SELECT 1 FROM AFFAIRE aff WHERE per.PER_ID = aff.PER_ID) ) ) WHERE PER_ID NOT IN ( (SELECT pdo.PER_ID FROM PERSONNE_DOSSIER pdo, EVENEMENT evt WHERE pdo.ROP_ID = 1 AND evt.PDO_ID = pdo.PDO_ID AND evt.PER_ID &lt;&gt; pdo.PER_ID ) UNION (SELECT pdo.PER_ID FROM PERSONNE_DOSSIER pdo, DESTINATAIRE_EVENEMENT des, EVENEMENT evt WHERE pdo.ROP_ID = 1 AND des.PDO_ID = pdo.PDO_ID AND des.EVT_ID = evt.EVT_ID AND evt.PER_ID &lt;&gt; pdo.PER_ID) UNION (SELECT dgi.PER_ID FROM DEMANDE_GIDE dgi, AFFAIRE aff where aff.AFF_ID = dgi.AFF_ID and aff.PER_ID &lt;&gt; dgi.PER_ID) ); </code></pre> <p>Here is the corresponding explain plan :</p> <pre><code>---------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| ---------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 13 | | 194K (1)| | 1 | SORT AGGREGATE | | 1 | 13 | | | |* 2 | FILTER | | | | | | | 3 | VIEW | | 1309 | 17017 | | 192K (1)| | 4 | SORT UNIQUE | | 1309 | 35344 | | 192K (24)| | 5 | UNION-ALL | | | | | | |* 6 | FILTER | | | | | | | 7 | HASH GROUP BY | | 1 | 28 | | 149K (1)| |* 8 | HASH JOIN RIGHT ANTI | | 1021K| 27M| 12M| 149K (1)| | 9 | VIEW | VW_SQ_1 | 756K| 4433K| | 26286 (1)| |* 10 | HASH JOIN | | 756K| 14M| 14M| 26286 (1)| |* 11 | INDEX FAST FULL SCAN | IDX_PEC_AFF_SER_ETAT | 756K| 5910K| | 4080 (3)| | 12 | TABLE ACCESS FULL | AFFAIRE | 3146K| 36M| | 17884 (1)| |* 13 | HASH JOIN | | 3648K| 76M| 2560K| 115K (1)| |* 14 | TABLE ACCESS FULL | PERSONNE | 130K| 1021K| | 14179 (2)| | 15 | TABLE ACCESS FULL | EVENEMENT | 29M| 391M| | 65035 (2)| |* 16 | HASH JOIN SEMI | | 1308 | 35316 | | 43080 (1)| |* 17 | HASH JOIN ANTI | | 1308 | 27468 | 2560K| 41493 (1)| |* 18 | TABLE ACCESS FULL | PERSONNE | 130K| 1021K| | 14179 (2)| | 19 | VIEW | VW_SQ_2 | 756K| 9605K| | 26286 (1)| |* 20 | HASH JOIN | | 756K| 14M| 14M| 26286 (1)| |* 21 | INDEX FAST FULL SCAN | IDX_PEC_AFF_SER_ETAT | 756K| 5910K| | 4080 (3)| | 22 | TABLE ACCESS FULL | AFFAIRE | 3146K| 36M| | 17884 (1)| | 23 | INDEX FAST FULL SCAN | FK_PER_AFF | 3146K| 18M| | 1572 (2)| | 24 | SORT UNIQUE | | 6 | 171 | | 1757 (100)| | 25 | UNION-ALL | | | | | | | 26 | NESTED LOOPS | | | | | | | 27 | NESTED LOOPS | | 2 | 46 | | 8 (0)| |* 28 | TABLE ACCESS BY INDEX ROWID | PERSONNE_DOSSIER | 1 | 15 | | 4 (0)| |* 29 | INDEX RANGE SCAN | FK_PER_PDO | 1 | | | 3 (0)| |* 30 | INDEX RANGE SCAN | FK_EVT_PDO | 2 | | | 2 (0)| |* 31 | TABLE ACCESS BY INDEX ROWID | EVENEMENT | 2 | 16 | | 4 (0)| | 32 | NESTED LOOPS | | | | | | | 33 | NESTED LOOPS | | 3 | 108 | | 16 (0)| | 34 | NESTED LOOPS | | 3 | 72 | | 10 (0)| |* 35 | TABLE ACCESS BY INDEX ROWID| PERSONNE_DOSSIER | 1 | 15 | | 4 (0)| |* 36 | INDEX RANGE SCAN | FK_PER_PDO | 1 | | | 3 (0)| | 37 | TABLE ACCESS BY INDEX ROWID| DESTINATAIRE_EVENEMENT | 3 | 27 | | 6 (0)| |* 38 | INDEX RANGE SCAN | FK_DVT_PDO | 3 | | | 2 (0)| |* 39 | INDEX UNIQUE SCAN | PK_EVENEMENT | 1 | | | 1 (0)| |* 40 | TABLE ACCESS BY INDEX ROWID | EVENEMENT | 1 | 12 | | 2 (0)| | 41 | NESTED LOOPS | | | | | | | 42 | NESTED LOOPS | | 1 | 17 | | 1730 (2)| |* 43 | TABLE ACCESS FULL | DEMANDE_GIDE | 1 | 5 | | 1728 (2)| |* 44 | INDEX UNIQUE SCAN | PK_AFFAIRE | 1 | | | 1 (0)| |* 45 | TABLE ACCESS BY INDEX ROWID | AFFAIRE | 1 | 12 | | 2 (0)| ---------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - filter( NOT EXISTS ( (SELECT "PDO"."PER_ID" FROM "EVENEMENT" "EVT","PERSONNE_DOSSIER" "PDO" WHERE "PDO"."PER_ID"=:B1 AND "PDO"."ROP_ID"=1 AND "EVT"."PDO_ID"="PDO"."PDO_ID" AND "EVT"."PER_ID"&lt;&gt;:B2 AND "EVT"."PER_ID"&lt;&gt;"PDO"."PER_ID" AND "EVT"."PDO_ID" IS NOT NULL)UNION (SELECT "PDO"."PER_ID" FROM "EVENEMENT" "EVT","DESTINATAIRE_EVENEMENT" "DES","PERSONNE_DOSSIER" "PDO" WHERE "PDO"."PER_ID"=:B3 AND "PDO"."ROP_ID"=1 AND "DES"."PDO_ID"="PDO"."PDO_ID" AND "DES"."PDO_ID" IS NOT NULL AND "DES"."EVT_ID"="EVT"."EVT_ID" AND "EVT"."PER_ID"&lt;&gt;:B4 AND "EVT"."PER_ID"&lt;&gt;"PDO"."PER_ID")UNION (SELECT "DGI"."PER_ID" FROM "AFFAIRE" "AFF","DEMANDE_GIDE" "DGI" WHERE "DGI"."AFF_ID" IS NOT NULL AND "DGI"."PER_ID"=:B5 AND "AFF"."AFF_ID"="DGI"."AFF_ID" AND "AFF"."PER_ID"&lt;&gt;:B6 AND "AFF"."PER_ID"&lt;&gt;"DGI"."PER_ID"))) 6 - filter(MAX("EVT"."EVT_DATE_UPDATE")&lt;ADD_MONTHS(SYSDATE@!,-60)) 8 - access("EVT"."PER_ID"="ITEM_1") 10 - access("AFF"."AFF_ID"="PEC"."AFF_ID") 11 - filter("PEC"."PEC_ETAT"='A') 13 - access("PER"."PER_ID"="EVT"."PER_ID") 14 - filter("PER"."PER_SI_DECES"&lt;&gt;1) 16 - access("PER"."PER_ID"="AFF"."PER_ID") 17 - access("PER"."PER_ID"="ITEM_2") 18 - filter("PER"."PER_SI_DECES"=1) 20 - access("AFF"."AFF_ID"="PEC"."AFF_ID") 21 - filter("PEC"."PEC_ETAT"='A') 28 - filter("PDO"."ROP_ID"=1) 29 - access("PDO"."PER_ID"=:B1) 30 - access("EVT"."PDO_ID"="PDO"."PDO_ID") filter("EVT"."PDO_ID" IS NOT NULL) 31 - filter("EVT"."PER_ID"&lt;&gt;:B1 AND "EVT"."PER_ID"&lt;&gt;"PDO"."PER_ID") 35 - filter("PDO"."ROP_ID"=1) 36 - access("PDO"."PER_ID"=:B1) 38 - access("DES"."PDO_ID"="PDO"."PDO_ID") filter("DES"."PDO_ID" IS NOT NULL) 39 - access("DES"."EVT_ID"="EVT"."EVT_ID") 40 - filter("EVT"."PER_ID"&lt;&gt;:B1 AND "EVT"."PER_ID"&lt;&gt;"PDO"."PER_ID") 43 - filter("DGI"."AFF_ID" IS NOT NULL AND "DGI"."PER_ID"=:B1) 44 - access("AFF"."AFF_ID"="DGI"."AFF_ID") 45 - filter("AFF"."PER_ID"&lt;&gt;:B1 AND "AFF"."PER_ID"&lt;&gt;"DGI"."PER_ID") </code></pre>
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