Sysview for Db2 history file resizing considerations

Products

• SYSVIEW Performance Management Option for DB2 for z/OS

Issue/Introduction

Due to the extreme thread history volume, the Sysview Performance Management Option for Db2 for z/OS (IDB2) 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?

Resolution

The following link provides the IDB2 history calculation considerations:

Empirical Estimation of History Data Set Sizes

Additional Information

In this specific case where the files wrapped within minutes the 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.