Sysview for DB2 history file resizing considerations
Article ID: 131649
Updated On:
Products
CA Bind Analyzer for DB2 for z/OS
CA SQL-Ease for DB2 for z/OS
CA Sysview Performance Management Option for DB2 for z/OS
CA Plan Analyzer for DB2 for z/OS
CA Subsystem Analyzer for DB2 for z/OS
Issue/Introduction
Due to the extreme thread history volume, the Sysview for DB2 history files are only providing a few minutes of data before they wrap.
Is there information on how to calculate larger allocations for the history files to accommodate at least twenty-four hours worth of history?
Is there information on how to calculate larger allocations for the history files to accommodate at least twenty-four hours worth of history?
Environment
IDB2 r19. DB2 v11, v12
Resolution
The following link provides the calculation considerations:
https://docops.ca.com/ca-sysview-db2/19/en/configuring/data-collector-dc/online-history/online-history-data-sets/empirical-estimation-of-history-data-set-sizes
https://docops.ca.com/ca-sysview-db2/19/en/configuring/data-collector-dc/online-history/online-history-data-sets/empirical-estimation-of-history-data-set-sizes
Additional Information
In this specific case where the files wrapped within minutes, recommendation was made to initially increase the history files
to contain a couple of hours, and then run the calculation as described in the above link.
From there, a more finite adjustment could be made.
to contain a couple of hours, and then run the calculation as described in the above link.
From there, a more finite adjustment could be made.
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