Tuning Sybase ASE

The discussion in this section focuses on Sybase System 11 and subsequent releases (System 11.5, 11.9.2, 12, and 12.5). Although the same basic principles apply to System 10 and earlier releases, not all features are available.

Tuning Memory

ASE 12.5 supports dynamic changes to the shared memory segment size. We consider this functionality and conclude with general memory tuning recommendations.

Dynamic Memory Tuning

Before ASE 12.5, the amount of shared memory could not be changed dynamically—a database restart was required after the parameters were changed. The total memory parameter, grouped under Physical Memory in the configuration file, determined the size of shared memory. Memory was allocated to named data caches ...

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