Remove the execution of more than 48 hours
Hello
I have the deletion request that runs more than 48 hours. How to find what really makes the query?
Sql plan, I can see that the query is FULL TABLE SCAN.
Query: REMOVE TRND_UPC_FV2_XAOC WHERE MRKT_KEY IN (11,12);
SPL plan:
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Hash value of plan: 2256923628
-----------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time | Pstart. Pstop |
-----------------------------------------------------------------------------------------------------------
| 0 | DELETE STATEMENT. 288 M | 6322M | 182K (2) | 00:36:26 | |
| 1. REMOVE | TRND_UPC_FV2_XAOC | | | | |
| 2. COORDINATOR PX | | | | | | |
| 3. PX SEND QC (RANDOM). : TQ10000 | 288 M | 6322M | 182K (2) | 00:36:26 | | |
| 4. ITERATOR BLOCK PX | 288 M | 6322M | 182K (2) | 00:36:26 | 1. 267.
|* 5 | TABLE ACCESS FULL | TRND_UPC_FV2_XAOC | 288 M | 6322M | 182K (2) | 00:36:26 | 1. 267.
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
5 - filter ("MRKT_KEY" = 11 GOLD "MRKT_KEY" = 12)
Event:
EVENT MACHINE P1, P2 P3 P3TEXT P2TEXT P1TEXT
------------------------------ -------------------- ---------- -------------------- ---------- ---------- ---------- ---------
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 5 passes 5.0440E + 17 qref
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 13 passes 5.0440E + 17 qref
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 2 spend 5.0440E + 17 qref
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 6 pass 5.0440E + 17 qref
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 6 pass 5.0440E + 17 qref
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 8 pass 5.0440E + 17 qref
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 10 passes 5.0440E + 17 qref
PX Deq Credit: send blkd lnx30.nielsen.com # sleeptime/senderid 11 pass 5.0440E + 17 qref
DB file sequential read lnx30.nielsen.com # file # 1693322 block # 1 blocks
9 selected lines.
Dependence:
NAME OF THE REFERENCED REFERENCED_NAME DEPE OWNER
---------- ------------------------------ ---------- ------------------------------ ----
BIR V_TRND_UPC_FCT_MRKT BIR TRND_UPC_FV2_XAOC HARD
Question: Why the query take so long? How to find the root cause.
Hello
> Why the query take so long? How to find the cause root
Well it seems that you have enabled a parallel query on table TRND_UPC_FV2_XAOC, but forgot to enable parallel DML as well. So the FTS is happening in parallel, but DELETE itself is treated in a unique way (check the position of the COORDINATOR PX implementation plan). If the parallel/DML query is not useful (or wanted to) here, because of the column volume 11 and 12 represent the data of the minority of the values MRKT_KEY and you have a valid and appropriate index for it - check the parallelism setting. However, we are already looking at the crystal ball.
For parallel DML stuff - check out the blog of Jonathan Lewis here: parallel DML. Notebook of the Oracle
Concerning
Stefan
Tags: Database
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