Issue with index in OpenLDAP? - openldap-technical

23 Dec 2011


      Hi @All,
We meet a performance problem with our OpenLDAP.
We think that we face a problem with the index of the database, and we
think that the problem can be resolve by tunning the config (but not sure).
We would like to be sure that our configuration is correct, in order to
confirm if we are on a wrong track or not.
*[Description]*
We have an attribute (cardNumber) which is indexed.
When we request the indexed attribute (cardNumber) with an LDAP Client
(Ldapbrowser), we have either fast or very long response time.
For the long response time, the CPU of the server hits 100%.
*For example*:
Request1: cardnumber=2098001010034  (less than 1sec)
Request2: cardnumber=2090389917486  (nearly 20 sec).
By checking the hit ratio of the attribute, we can see that cache is
correctly used (97%).
*[Details]*
- We are running on a VM with RedHat with 4 process with 24 Go RAM.
- The version of the OpenLDAP is 2.4.16.
- We have 2 500 000 accounts.
*[Attachment]*
- *201111223_os.txt*                  -> informations about OS and Hardware.
- *openldap_version.txt*              -> informations about the version of
OpenLDAP.
- *20111220_stats.txt*                -> informations about index and perf.
- *olcDatabase={1}hdb.ldif.txt *    -> informations about hdb config.
Do not hesitate if you need some more informations.
Thank you for your help (:
Mathieu