Re: caching magic

[Howard Chu <hyc@symas.com>]

Igor Brezac wrote:

> On Thu, 17 Jun 2004, Quanah Gibson-Mount wrote:

> > No, it goes in slapd.conf in OpenLDAP 2.2 or later.  It is documented in
> > the slapd-bdb manpage:
> >
> >     shm_key <integer>
> >          Specify a key for a shared memory BDB  environment.  By
> >          default  the  BDB environment uses memory mapped files.
> >          If a non-zero value is specified, it will  be  used  as
> >          the  key  to  identify a shared memory region that will
> >          house the environment.

> > > From my slapd.conf:
> >
> > database    bdb
> > shm_key     5

> This can go in DB_CONFIG:
> http://www.sleepycat.com/docs/api_c/env_set_shm_key.html

No, that alone is not enough. If it were enough by itself, I would never 
have added this code to back-bdb. You also need to set the DB_SYSTEM_MEM 
flag when creating the environment, and this flag cannot be set in 
DB_CONFIG. Using the shm_key keyword tells back-bdb the key *and* tells 
it to set the flag when creating the environment.
--
  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support