2010/8/2 Rich Megginson <rmeggins@redhat.com>
Juan Asensio Sánchez wrote:
> Hi
>
> I am trying to tune the performance of the Directory Server. We have
> increased the memory for the database cache and for each database
> entry cache. These are the new values:
>
> cn=config, cn=ldbm database, cn=plugins, cn=config
> nsslapd-dbcachesize: 838860800 (~800MB)
>
> cn=*,cn=ldbm database, cn=plugins, cn=config
> nsslapd-cachememsize: 125829120 (~120MB)
>
> We have 27 databases, and the servers have 16 GB of RAM, so the server
> should be able to handle all that memory (800 + 120*27 = 4040MB). But
> when I go to the monitoring section of the management console, the
> database cache says the hit ratio is 99% (this is OK according to the
> documentation, near 100%), but the entry cache is 0%, that is very far
> for 100% that the documentation recomends (see screenshots attached).
> Am I confused or the configuration is not correct?
When you start out with an empty cache, the cache hit ratio will be 0
until entries get into the cache and are pulled from the cache rather
than the database.

Try doing a search like ldapsearch ... -b "basesuffixofdatabase"
"objectclass=*"
>

Well, the servers are running for a long time, not only a days. I have done that search, but the "Entry cache hit ratio" remains 0. I have also noticed that "Current entry cache size (in entries)" is only 4168, even after the search, although out directory cointains about 50000 entries. Is this normal?
 
> Regards.
>