Re: High volume ldap queries causing corruption in bdb backend.

[Peter Johnson <paj1@humboldt.edu>]

Dylan,,

	Don't know about a definitive solution, but creating the DB_CONIG
file and setting the cache size to about 1GB seems to have fixed my 
performance problem.

	Thanks very much  to Howard Chu on this list for his help.


On Friday 10 October 2003 15:23, Dylan Martin wrote:
> Hi, I'm knee deep in what seems to be the same problem described in
> eariler emails with this same subject.
>
> Looking at db_stat, locks and memory seem happy.  db_verify tells me
> 'Database verification failed' even when things seem OK.
>
> Has anyone found a definitive solution?
>
> To summarise, under load something goes bad and ldap slows to a crawl.
> Queries that used to take 1.5 seconds then take 10 minutes.  The problem
> seems to be in the data files, because restarting the slapd doesn't help,
> and rebuilding the database ala slapcat/slapadd in my case and db_recover
> -c in the case of the earlier poster seems to be the only way to restore
> performance.  I can copy bad datafiles to another box and see the same
> performance trouble.
>
> I'm running Linux, RH 9.
> OpenLdap 2.1.22
> Berkeley DB 4.1.25
>
> Any hints appriciated
>
> -Dylan Martin
>  Unix Admin, Seattle Central Community College

-- 
Peter Johnson	
Humboldt State University
707-826-6122