2 つの巨大なテーブルがあり、約 6,000 万のレコードを更新しようとしています。以前は 30 分で更新されていましたが、現在は n 時間かかり、データの増加の 20% にも満たない. 詳細はこちら。「セルの単一ブロックの物理読み取り」「PX Deq: Table Q Normal」イベントで多くの待機があることがわかります。並列ヒントが機能しない理由がわかりません。それがセルシングルブロックの物理読み取りの理由ですか？または、パフォーマンスが低下する他の理由がありますか? 「WHERE EXISTS」句を取り除くことでパフォーマンスを向上させる理由はありますか?
table1(A) サイズ 316 GB レコード数 456,365,654
table2(B) 7GB レコード数 31,934,956
UPDATE /*+ parallel (a, 8) */
table1 a
SET (c_age,
c_age_de,
wa_only_ind) =
(SELECT c_age,
c_age_de,
wa_only_ind
FROM table2 b
WHERE B.ip = A.ip
AND a.c_age IS NULL
AND b.o_type IN ('TYPE12', 'TYPE14'))
WHERE EXISTS
(SELECT 1
FROM table2 b2
WHERE b2.ip = a.ip
AND a.c_age IS NULL
AND b2.o_type IN ('TYPE12', 'TYPE14'));
エクスレインプラン
----------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib |
----------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | UPDATE STATEMENT | | 17M| 9599M| 5076M (20)|999:59:59 | | | | | |
| 1 | UPDATE | TABLE1 | | | | | | | | | |
| 2 | PX COORDINATOR | | | | | | | | | | |
| 3 | PX SEND QC (RANDOM) | :TQ10002 | 17M| 9599M| 1069K (1)| 04:09:40 | | | Q1,02 | P->S | QC (RAND) |
|* 4 | HASH JOIN RIGHT SEMI BUFFERED| | 17M| 9599M| 1069K (1)| 04:09:40 | | | Q1,02 | PCWP | |
| 5 | PX RECEIVE | | 29M| 476M| 23984 (2)| 00:05:36 | | | Q1,02 | PCWP | |
| 6 | PX SEND HASH | :TQ10000 | 29M| 476M| 23984 (2)| 00:05:36 | | | Q1,00 | P->P | HASH |
| 7 | PX BLOCK ITERATOR | | 29M| 476M| 23984 (2)| 00:05:36 | | | Q1,00 | PCWC | |
|* 8 | TABLE ACCESS STORAGE FULL| TABLE2 | 29M| 476M| 23984 (2)| 00:05:36 | | | Q1,00 | PCWP | |
| 9 | PX RECEIVE | | 57M| 30G| 1045K (1)| 04:04:04 | | | Q1,02 | PCWP | |
| 10 | PX SEND HASH | :TQ10001 | 57M| 30G| 1045K (1)| 04:04:04 | | | Q1,01 | P->P | HASH |
| 11 | PX BLOCK ITERATOR | | 57M| 30G| 1045K (1)| 04:04:04 | 1 | 3 | Q1,01 | PCWC | |
|* 12 | TABLE ACCESS STORAGE FULL| TABLE1 | 57M| 30G| 1045K (1)| 04:04:04 | 1 | 6 | Q1,01 | PCWP | |
|* 13 | FILTER | | | | | | | | | | |
|* 14 | TABLE ACCESS BY INDEX ROWID | TABLE2 | 1 | 210 | 4 (0)| 00:00:01 | | | | | |
|* 15 | INDEX RANGE SCAN | TABLE2_IDX1 | 1 | | 3 (0)| 00:00:01 | | | | | |
----------------------------------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("B2"."IP"="A"."IP")
8 - storage("B2"."O_TYPE"='TYPE1' OR "B2"."O_TYPE"='TYPE12')
filter("B2"."O_TYPE"='TYPE1' OR "B2"."O_TYPE"='TYPE12')
12 - storage("A"."C_AGE" IS NULL)
filter("A"."C_AGE" IS NULL)
13 - filter(:B1 IS NULL)
14 - filter("B"."O_TYPE"='TYPE1' OR "B"."O_TYPE"='TYPE12')
15 - access("B"."IP"=:B1)
SQL_ID dd0ah20057j37
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib | OMem | 1Mem | O/1/M |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | UPDATE STATEMENT | | | | 43T(100)| | | | | | | | | |
| 1 | UPDATE | TABLE1 | | | | | | | | | | | | |
| 2 | PX COORDINATOR | | | | | | | | | | | | | |
| 3 | PX SEND QC (RANDOM) | :TQ10002 | 57M| 31G| 65326 (3)| 00:14:16 | | | Q1,02 | P->S | QC (RAND) | | | |
|* 4 | HASH JOIN RIGHT SEMI BUFFERED| | 57M| 31G| 65326 (3)| 00:14:16 | | | Q1,02 | PCWP | | 1537M| 25M| 2/0/0|
| 5 | PX RECEIVE | | 32M| 550M| 2190 (20)| 00:00:29 | | | Q1,02 | PCWP | | | | |
| 6 | PX SEND HASH | :TQ10000 | 32M| 550M| 2190 (20)| 00:00:29 | | | Q1,00 | P->P | HASH | | | |
| 7 | PX BLOCK ITERATOR | | 32M| 550M| 2190 (20)| 00:00:29 | | | Q1,00 | PCWC | | | | |
|* 8 | TABLE ACCESS STORAGE FULL| TABLE2 P1 | 32M| 550M| 2190 (20)| 00:00:29 | | | Q1,00 | PCWP | | 1025K| 1025K| 2/0/0|
| 9 | PX RECEIVE | | 57M| 30G| 63100 (2)| 00:13:47 | | | Q1,02 | PCWP | | | | |
| 10 | PX SEND HASH | :TQ10001 | 57M| 30G| 63100 (2)| 00:13:47 | | | Q1,01 | P->P | HASH | | | |
| 11 | PX BLOCK ITERATOR | | 57M| 30G| 63100 (2)| 00:13:47 | 1 | 3 | Q1,01 | PCWC | | | | |
|* 12 | TABLE ACCESS STORAGE FULL| TABLE1 | 57M| 30G| 63100 (2)| 00:13:47 | 1 | 6 | Q1,01 | PCWP | | 1025K| 1025K| 2/0/0|
|* 13 | FILTER | | | | | | | | | | | | | |
|* 14 | TABLE ACCESS BY INDEX ROWID | TABLE2 | 320K| 113M| 12787 (1)| 00:02:48 | | | | | | | | |
|* 15 | INDEX RANGE SCAN | TABLE2_IDX1 | 128K| | 4 (25)| 00:00:01 | | | | | | 1025K| 1025K| |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("U2"."IP"="I"."IP")
8 - storage(:Z>=:Z AND :Z<=:Z AND (("U2"."OPERATION_TYPE"='TYPE1' OR "U2"."OPERATION_TYPE"='TYPE12')))
filter(("U2"."OPERATION_TYPE"='TYPE1' OR "U2"."OPERATION_TYPE"='TYPE12'))
12 - storage(:Z>=:Z AND :Z<=:Z AND "I"."AGE" IS NULL)
filter("I"."AGE" IS NULL)
13 - filter(:B1 IS NULL)
14 - filter(("U"."OPERATION_TYPE"='TYPE1' OR "U"."OPERATION_TYPE"='TYPE12'))
15 - access("U"."IP"=:B1)
Plan hash value: 1669240984
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes|E-Temp | Cost (%CPU)| E-Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib | OMem | 1Mem | O/1/M |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | MERGE STATEMENT | | | | | 374K(100)| | | | | | | | | |
| 1 | MERGE | TABLE1 | | | | | | | | | | | | | |
| 2 | PX COORDINATOR | | | | | | | | | | | | | | |
| 3 | PX SEND QC (RANDOM) | :TQ10002 | 413M| 574G| | 374K (2)| 01:21:50 | | | Q1,02 | P->S | QC (RAND) | | | |
| 4 | VIEW | | | | | | | | | Q1,02 | PCWP | | | | |
|* 5 | HASH JOIN BUFFERED | | 413M| 574G| 3583M| 374K (2)| 01:21:50 | | | Q1,02 | PCWP | | 2047M| 100M| |
| 6 | PX RECEIVE | | 32M| 27G| | 2199 (20)| 00:00:29 | | | Q1,02 | PCWP | | | | |
| 7 | PX SEND HASH | :TQ10000 | 32M| 27G| | 2199 (20)| 00:00:29 | | | Q1,00 | P->P | HASH | | | |
| 8 | PX BLOCK ITERATOR | | 32M| 27G| | 2199 (20)| 00:00:29 | | | Q1,00 | PCWC | | | | |
|* 9 | TABLE ACCESS STORAGE FULL| TABLE2 | 32M| 27G| | 2199 (20)| 00:00:29 | | | Q1,00 | PCWP | | 1025K| 1025K| 2/0/0|
| 10 | PX RECEIVE | | 413M| 218G| | 67413 (9)| 00:14:44 | | | Q1,02 | PCWP | | | | |
| 11 | PX SEND HASH | :TQ10001 | 413M| 218G| | 67413 (9)| 00:14:44 | | | Q1,01 | P->P | HASH | | | |
| 12 | PX BLOCK ITERATOR | | 413M| 218G| | 67413 (9)| 00:14:44 | 1 | 3 | Q1,01 | PCWC | | | | |
|* 13 | TABLE ACCESS STORAGE FULL| TABLE1 | 413M| 218G| | 67413 (9)| 00:14:44 | 1 | 6 | Q1,01 | PCWP | | 1025K| 1025K| 2/0/0|
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
5 - access("I"."IP"="U"."IP")
9 - storage(:Z>=:Z AND :Z<=:Z AND (("U"."OPERATION_TYPE"='TYPE1' OR "U"."OPERATION_TYPE"='TYPE12')))
filter(("U"."OPERATION_TYPE"='TYPE1' OR "U"."OPERATION_TYPE"='TYPE12'))
13 - storage(:Z>=:Z AND :Z<=:Z)