RE: growth pains, ldbm or bdb?

[Quanah Gibson-Mount <quanah@stanford.edu>]

--On Monday, January 19, 2004 10:18 PM +0100 "J.J. van Gorkum" 
<job@knowzone.org> wrote:

> On nscd,
> from: man page of nscd
>
> Nscd caches libc-issued requests to the Name Service. If retrieving NSS
> data is fairly expensive, nscd is able to speed up consecutive access to
> the same data dramatically and increase overall system performance.
>
> Key is here: NSS data (that's user/group/host/etc info) so no caching of
> other entries...
> And if it would what would you do with updates to records in the LDAP
> database? The main problem with caching is: who should you trust to hold
> the most accurate information...

Very correct, and nscd is one of the first things we turn off in our 
Solaris builds.  One reason we don't use any sort of caching system for 
maildrop entries is that any user can change their mail delivery 
preferences at any time, so where the mail is to be delivered can change 
between one lookup and the next.

--Quanah

--
Quanah Gibson-Mount
Principal Software Developer
ITSS/TSS/Computing Systems
ITSS/TSS/Infrastructure Operations
Stanford University
GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html