Query plan shows larg amount of time
I ran explain plan for the query below and it takes a long time:
update table docs d
set d.mismatch = 'Y'
where exists (select 1 from diff a where a.versions > 1 and a.ed_id = d.ed_id)
diff is a view with 1069493 rows
docs is a table with 1527012 rows.
Any idea on improving performance. Please!
I'm running 10g. Please see the plan output below:
PLAN_TABLE_OUTPUT
Plan hash value: 2669996443
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
| 0 | UPDATE STATEMENT | | 76351 | 3131K| | 115K (2)| 00:39:49 |
| 1 | UPDATE | DOC | | | | | |
|* 2 | HASH JOIN | | 76351 | 3131K| | 115K (2)| 00:39:49 |
| 3 | SORT UNIQUE | | 53475 | 1201K| | 80731 (1)| 00:27:49 |
| 4 | VIEW | DIFF | 53475 | 1201K| | 80731 (1)| 00:27:49 |
|* 5 | FILTER | | | | | | |
PLAN_TABLE_OUTPUT
| 6 | SORT GROUP BY | | 53475 | 1566K| | 80731 (1)| 00:27:49 |
| 7 | VIEW | | 1527K| 43M| | 80731 (1)| 00:27:49 |
| 8 | SORT GROUP BY | | 1527K| 249M| 581M| 80731 (1)| 00:27:49 |
| 9 | TABLE ACCESS FULL| DOC | 1527K| 249M| | 34009 (1)| 00:11:44 |
| 10 | TABLE ACCESS FULL | DOC | 1527K| 27M| | 34494 (3)| 00:11:54 |
Predicate Information (identified by operation id):
2 - access("A"."EDV_ED_ID"="D"."EDV_ED_ID")
PLAN_TABLE_OUTPUT
5 - filter(COUNT(*)>1)
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