Re: Question on slapd.conf indexes and attribute properties in schemas

[Pierangelo Masarati <ando@sys-net.it>]

Tak Fujiwara wrote:

> First Question:
> What is the purpose of the "pres" index?  How can I use it when I
> search for particular entries?
>  

searches like "(cn=*)" are sped up by using a "pres" index, which simply 
indicates whether an attribute is present in the entry regardless of its 
value.

> Second Question:
> How do these indexes work?  Like for instance, in the schema, you can
> use substrings for mail.  I can use ldapsearch to search for an email
> and find the entry successfully using substrings without having to
> create a "mail sub" entry for mail in slapd.conf.  However, searching
> for a specfic given name using ldapsearch and setting a "gn eq" in
> slapd.conf would yield no results.
>  

As indicated in the docs, aftr changing indices in slapd.conf you need 
to update/generate them by running slapindex, otherwise not only they're 
ineffective, but the presence of the index directive in the absence of 
the file (or its presence  with incomplete indices) tricks slapd into 
believing that there's no match while actually there's no indices.  Of 
course searches for unindexed attributes work; indices ar only required 
to improve performances (the improvement can be dramatic).

p.


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