Streams SQL Apply Degrades with Large Transactions and Transformations
(Doc ID 453466.1)
Last updated on JANUARY 11, 2023
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
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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.
Cause
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In this Document
Symptoms |
Cause |
Solution |
References |