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Re: poor performance of Openldap/Pgsql-7.4.1
> I installed OpenLDAP-2.2.11/PgSQL-7.4.1 on Solaris9.
> After I added one thousand entries, although I tuned up parameters of
> postgresql.conf, used directorymark tool to test the performance of
> ldapsearch, the results was only 1.7ops. It was very poor.
> (By back-bdb with same entries, I got 387.8ops. )
By definition, back-sql should not be considered a replacement of any
native storage backend, e.g. back-bdb. Read
http://www.openldap.org/faq/data/cache/378.html for details. Any
performance comparison would be unfair and useless.
> Information of my entries like:
> dn: cn=zhang(0-1000),o=sql,c=RU
> objectClass: top
> objectClass: inetOrgPerson
> cn: zhang(0-1000)
> sn: pu
> o: sql
> uid: (0-1000)
> mail: firstname.lastname@example.org
> employeeNumber: (0-1000)
> I used all of default sql files under /back-sql/pgsql/ to create the
> data store, but only added one line in testdb_create.sql as below.
> CREATE UNIQUE INDEX PK_authors_docs ON authors_docs (pers_id,doc_id);
> Has anybody gotten high performance by postgresql?
> Would you please give me suggestions?
I would suggest to add indices on all keys, if you didn't yet.
> Another question:
> Does back-sql support all of matching rules of RFC?
No. It tries to do its best with some of the matching rules; in some
cases, to be conservative, it gives up applying matches at the SQL level
and returns candidates, leaving the matching rule application to slapd; in
other cases it simply gives up. For instance, if you map a value of
"My Name" (note the double space; quotes are not part of the value) to a
"cn", the exact match will always fail, because slapd normalizes it
to "My Name" (note the single space). This could be removed at the
expense of a much higher overhead, because all the occurrences of
"special" chars, e.g. spaces in attributes with directory string syntax,
should be replaced by "%" and substring ("like") assertions should be used
even for exact matches. This is what is done, for instance, for
attributes with telephone number syntax, so that a telephone number "001
234 5678" matches "0012345678" as well as "#001-234-5678". If there's
anything special you need, and you think it could be of general use, feel
free to discuss it on -devel. back-sql is experimental, in the sense that
there is still a lot of work to do about it.
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