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KB-10195: How to enable Centrify DB2 plugin caching?

19 April,18 at 11:49 PM

Question:

Centrify DB2 plugin can be configured to use the in-process memory CAPI cache which would greatly improve performance with Active Directory user and group lookups.  But how do we enable the CAPI cache?

Answer:

To enable the CAPI cache, set  the following parameter to 'true' in /etc/centrifydc/centrifydc.conf file.  Default is disabled, 'false'

capi.cache.enabled: true

There are a few more parameters that can be configured to further tune the DB2 plugin CAPI cache.  The listed values are the defaults.

This configuration parameter specifies the number of seconds that a positive cached object remains in the in-memory CAPI cache before it is refreshed. This parameter takes effect only if the inmemory CAPI cache is enabled.

capi.cache.ttl: 3600

This configuration parameter specifies the number of seconds that a negative cached object remains in the in-memory CAPI cache
before it is refreshed. This parameter takes effect only if the in-memory CAPI SID cache is enabled.

capi.cache.negative.ttl: 3600

This configuration parameter specifies the maximum number of objects that are kept in the in-memory CAPI cache if the cache is
enabled. If the number is exceeded, cached objects that are the oldest are replaced with new objects.

capi.cache.max.objects: 10000

This configuration parameter specifies the number of hash map buckets that are allocated if the in-memory CAPI cache is enabled.

capi.cache.hash.table.size: 769

Please note that after a change to any of the above parameters, DB2 instance needs to be restarted to take effect.
 

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