DELETE Query Running For Long Time.
(Doc ID 2097775.1)
Last updated on SEPTEMBER 06, 2021
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.4 and laterOracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
Below query is running for 18 to 24 hrs in database.
DELETE /*+Parallel(a,4)*/ FROM <schema_name>.<table_name> a where time_key >=20151223;
.Table is portioned table
.query explain plan is given below.
PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 205266384
---------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib |
---------------------------------------------------------------------------------------------------------------------------------------
| 0 | DELETE STATEMENT | | 1441K| 34M| 38745 (1)| 00:09:03 | | | | | |
| 1 | DELETE | <table_name> | | | | | | | | | |
| 2 | PX COORDINATOR | | | | | | | | | | |
| 3 | PX SEND QC (RANDOM)| :TQ10000 | 1441K| 34M| 38745 (1)| 00:09:03 | | | Q1,00 | P->S | QC (RAND) |
| 4 | PX BLOCK ITERATOR | | 1441K| 34M| 38745 (1)| 00:09:03 | 1 | 4 | Q1,00 | PCWC | |
|* 5 | TABLE ACCESS FULL| <table_name> | 1441K| 34M| 38745 (1)| 00:09:03 | 57 | 64 | Q1,00 | PCWP | |
---------------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
5 - filter("TIME_KEY">=20151222)
17 rows selected.
Changes
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |