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Streams SQL Apply Degrades with Large Transactions and Transformations (Doc ID 453466.1)

Last updated on MARCH 12, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.2 to 10.2.0.3 [Release 10.2]
Information in this document applies to any platform.

Symptoms

NOTE: In the images and/or the document content below, the user information and data used represents fictitious data from the Oracle sample schema(s) or Public Documentation delivered with an Oracle database product.  Any similarity to actual persons, living or dead, is purely coincidental and not intended in any manner.

Streams' Apply performance is very slow;
It is taking a number of hours to process a transaction with 200K LCRs;
High CPU is also observed from the parallel query server involved in processing the transaction;
Any kind of large transaction on any table which has a transformation appears to be associated with the issue.


Periodically generating stack information from the p00* server which is generating high CPU shows:

ktaifm ktagetg ktagdw ktaadm kksfbc opiexe kpoal8 opiodr kpoodrc rpiswu2
kpoodr upirtrc kpurcsc kpuexecv8 kpuexec OCIStmtExecute knalspGetLcr
knalsglcr knaspx knalsptxn knasm2 knalsma kxfprdp opirip opidrv sou2o opimai_real main

The stack should be periodically obtained by using PSTACK , a debugger such as GDB or from
short_stack within sqlplus , ie

The functions on the stack which begin kta are involved in lock access.

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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