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How to Set the _TXN_BUFFER_SIZE Parameter for a Streams Apply Process (Doc ID 315666.1)

Last updated on FEBRUARY 04, 2022

Applies to:

Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database - Enterprise Edition - Version to [Release 10.1 to 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Information in this document applies to any platform.


The output from <Note 273674.1> Streams Configuration Report and Health Check Script
may suggest the following for some environments:

SUGGESTION: One or more Apply processes have parallelism 1 
If your workload consists of many independent transactions 
and you notice that apply is the bottleneck of your system, 
you might consider increasing the parallelism of the apply process 
to three times the number of CPUs on your system via dbms_apply_adm.set_parameter 
Be sure to set supplemental logging and the '_TXN_BUFFER_SIZE' apply parameter 

This article provides an example of setting the _TXN_BUFFER_SIZE parameter for
the apply process in a Streams environment.

For further information on Apply tuning please refer to:
<Note: 335516.1> Streams Performance Recommendations



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