(iSeries)

DB2 Universal Database performance tips

We can adjust the system QSQSRVR prestart job settings to optimize the process of acquiring connections from DB2 Universal Database™ for IBM i.

On the IBM i platform, QSQSRVR jobs process Java Database Connectivity (JDBC) tasks. By default, five QSQSRVR jobs are initially active. When fewer than two QSQSRVR jobs are unused, the IBM i system creates two more jobs. If we increase the active job values, an application that establishes a large number of database connections over a short period of time might create connections more quickly. Increase the values for the initial number of jobs, threshold, and additional number of jobs by running this command on an IBM i command line:

CHGPJE SBSD(QSYS/QSYSWRK) PGM(QSYS/QSQSRVR)

Do not start more QSQSRVR jobs than the application requires. Active QSQSRVR jobs require some overhead, even if these jobs are not used.

Tune the application serving environment

IBM i Information Center: Monitor and tune database performance

IBM i Performance Management Resource Library