The default level of cache at installation is suited to a test environment, not a production environment. For tuning purposes, you might want to monitor the database cache for your server.
You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.
Monitor database cache.
$ ldapsearch -h host -p port -D cn=admin,cn=Administrators,cn=config -w - \ -b "cn=monitor,cn=ldbm database,cn=plugins,cn=config" "(objectclass=*)"
If the database cache size is large enough and it has been primed, the hit ratio (dbcachehitratio) should be high. In addition, the number of pages that are read in (dbcachepagein) and the clean pages that are written out (dbcacheroevict) should be low. Here, “high” and “low” are relative to the deployment constraints.