slapcat question

["Tibbetts, Ric" <ric.tibbetts@ngc.com>]

All;
I had a recent situation where the performance of my OpenLDAP server was 
"in the bucket". Searches took far to long (up to 10 minutes), and 
logins were painfully slow.
I shut down the server, and ran slapindex last night, and it cleared the 
problems up. So, it would appear that it was just an index issue.

So that raises a question:
How often should slapindex be run, to maintain a well performing database?
In my case, I have just over 70,000 user IDs, with users being 
added/deleted on a fairly regular basis (I update against another server 
3 times a day). With that amount of churn, should I look to run 
slapindex on a weekly basis? Or would once a month be enough?
I don't want to just "wait until it's running slow" to run it. I'd like 
it to be a regular maintenance item.

Anyone have any thoughts on this?

Thank you!

-Ric