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Re: Performance Problems
OK. How do I set "DB_TXN_NOSYNC". I can't find a reference to it in the
Administrators Guide and the Faq-o-matic doesn't specify how to use this
value. I did find "dbnosync" in "slapd-bdb" man page. Is that the same
On Mon, 11 Nov 2002, Ian Logan wrote:
> Have you tried changing/setting some of the bdb tunables?
> You might try setting DB_TXN_NOSYNC while you're running slapadd,
> that can make a big difference. You might also want to increase
> the size of your bdb cache, if I remember right they default pretty small.
> On Mon, Nov 11, 2002 at 01:01:42PM -0800, Christoph Neumann wrote:
> > We are testing openldap 2.1.8 as a slave in our production enviroment. We
> > have experienced serveral problems. I am wondering if other people are
> > experiencing the same problems or if they have solved some of these
> > problems.
> > Some notes about configuration:
> > * have about 20,000 entries--mostly "people" entries
> > * using BDB backend (db4-4.0.14-14 installed)
> > * indexing several fields:
> > index objectClass pres,eq
> > index uid pres,eq,sub
> > index uidNumber pres,eq
> > index gidNumber pres,eq
> > index mailacceptinggeneralid eq
> > index apuidnumber eq
> > index rid eq
> > 1. slapadd is *very* slow compared to the using slapadd with back-ldbm on
> > openldap 2.0.25. slapadd now takes about 45 minutes, whereas it used to
> > take about 4 minutes. The only way I have found to fix this, is to
> > slapadd with all the indexes turned off. Which leads to my next
> > point...
> > 2. slapindex is *very* slow. It takes about 45 minutes to reindex. It
> > doesn't matter if slapd is running or not. It still take forever.
> > 3. My "uidNumber" index is corrupt. I rebuilt the database from an LDIF
> > when I upgraded the slave to 2.1.8, so there still must be index
> > corruption issues.
> > Anyone else experiencing this? Anyone have ideas on what might be going
> > on? I have never had OpenLDAP behave this slowly on me before.
> > - Christoph
> Ian Logan
> Information and Communication Technologies
> New Mexico State University
> Email: email@example.com Phone: 505-646-6034 Fax: 505-646-4560