Red Hat Summit7.2. Adjusting the database index cache size in the IdM Directory Server
Do not change this settings, unless you have a strong need to apply your custom values. IdM Directory Server uses the built-in cache auto-sizing feature for optimized performance.
The nsslapd-dbcachesize attribute controls the amount of memory the database indexes use. This cache size has less of an impact on Directory Server performance than the entry cache size does, but if there is available RAM after the entry cache size is set, Red Hat recommends increasing the amount of memory allocated to the database cache.
The database cache is limited to 1.5 GB RAM because higher values do not improve performance.
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| Valid range |
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| Entry DN location |
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Prerequisites
- The LDAP Directory Manager password
Procedure
Disable automatic cache tuning, and set the database cache size. This example sets the database cache to 256 megabytes.
[root@server ~]# dsconf -D "cn=Directory Manager" ldap://<server_fqdn> backend config set --cache-autosize=0 --dbcachesize=268435456Restart the Directory Server.
[root@server ~]# systemctl restart dirsrv.target-
Monitor the IdM Directory Server’s performance. If it does not improve, repeat this procedure and adjust
dbcachesizeto a different value, or re-enable cache auto-sizing.
Verification
Display the value of the
nsslapd-dbcachesizeattribute and verify it has been set to your desired value.[root@server ~]# ldapsearch -D "cn=Directory Manager" -w <directory_manager_password> -b "cn=config,cn=ldbm database,cn=plugins,cn=config" | grep nsslapd-dbcachesize nsslapd-dbcachesize: 2147483648
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