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Re: slapindex performance?
--On Friday, February 24, 2006 7:52 PM -0800 Krishna Sivaramapuram
I'm trying to reindex my slapd database (bdb) since I added one more
equality index. My db has more than 6M entries. I'm trying to see how
long this will take... I didn't find any proper reference in the web. Has
anyone done something similar and have any performance data on slapindex?
What version of OpenLDAP are you using?
I would suggest (of course) OpenLDAP 2.3. In OpenLDAP 2.3, there are two
things that massively improve the speed of slapindex (which is slower than
slapadd in all previous releases). They are:
The "-q" option, to run it via "quick"
The ability to set "tool-threads", which will allow slapindex to use
multiple CPU's while indexing your DB.
Also, if you are adding a brand new index, there is no need to re-index all
your existing indices. You only need to index what is new, which will also
speed up slapindex. I.e.,
edit slapd.conf, commenting out all indices except the new one(s).
Run slapindex -q with an appropriate amount of tool-threads (1 per CPU, so
on a 2 CPU system, tool-threads 2, etc)
After it is done, edit slapd.conf, uncommenting your pre-existing indices.
Principal Software Developer
ITS/Shared Application Services
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