According to my experience, the single directive you should add to db section to improve performance is:
olcDbCacheSize
OpenLDAP tuning guide covers that in section: 21.4.2.
To enable a 200000 entries cachesize use this ldif:
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| dn: olcDatabase={1}hdb,cn=config | |
| changetype: modify | |
| add: olcDbCacheSize | |
| olcDbCacheSize: 200000 |
The enumeration of the whole directory (150000 entries) took 15 seconds without cachesize and less than 6 seconds with it.
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