18.4.4 DBSS Parameter - Performance Tuning

This X_RUN parameter may be used to adjust the maximum number of reusable SQL statements that are cached for reuse.

DBSS=0 will disable caching, which is not recommended, as it will generally result in performance degradation unless no SQL statements are reused.

DBSS=50 is the default.

Also see

18.4.14 RRNA and RRNB Parameters - Performance Tuning