slapd-ldbm — LDBM backend to slapd
ETCDIR/slapd.conf
The LDBM backend to slapd(8) is an easy−to−configure but obsolete database backend. It does not offer the data durability features of the BDB and HDB backends and hence is considered deprecated in favor of these robust backends. LDBM uses lightweight non−transactional data interfaces, such as those provided by GDBM or Berkeley DB, to store data. It makes extensive use of indexing and caching to speed data access.
These slapd.conf
options apply to the LDBM backend database. That is, they
must follow a "database ldbm" line and come before any
subsequent "backend" or "database" lines. Other database
options are described in the slapd.conf(5) manual
page.
Specify the size in entries of the in-memory cache maintained by the LDBM backend database instance. The default is 1000 entries.
Specify the size in bytes of the in-memory cache associated with each open index file. If not supported by the underlying database method, this option is ignored without comment. The default is 100000 bytes.
Specify that no database locking should be performed. Enabling this option may improve performance at the expense of data security. Do NOT run any slap tools while slapd is running.
Specify that on-disk database contents should not be immediately synchronized with in memory changes. Enabling this option may improve performance at the expense of data security.
Flush dirty database buffers to disk every
<seconds>
seconds. Implies dbnosync
(ie.
individual updates are no longer written to disk). It
attempts to avoid syncs during periods of peak activity
by waiting <delayinterval>
seconds if the server is busy, repeating this delay up
to <maxdelays>
times
before proceeding. It is an attempt to provide higher
write performance with some amount of data security.
Note that it may still be possible to get an
inconsistent database if the underlying engine fills
its cache and writes out individual pages and slapd
crashes or is killed before the next sync. <maxdelays>
and
<delayinterval>
are optional and default to 12
and 5
respectively, giving a total
elapsed delay of 60 seconds before a sync will occur.
<maxdelays>
may
be zero, and <delayinterval>
must be 1 or greater.
Specify the directory where the LDBM files
containing this database and associated indexes live. A
separate directory must be specified for each database.
The default is LOCALSTATEDIR/openldap-data
.
index {<attrlist>|default}
[pres,eq,approx,sub,<special>] Specify the
indexes to maintain for the given attribute (or list of
attributes). Some attributes only support a subset of
indexes. If only an <attr> is given, the indices
specified for default
are maintained.
Note that setting a default does not imply that all
attributes will be indexed. Also, for best performance,
an eq
index
should always be configured for the objectClass
attribute.
A number of special index parameters may be
specified. The index type sub
can be decomposed
into subinitial
, subany
, and subfinal
indices. The
special type notags
(or nolang
) may be
specified to disallow use of this index by subtypes
with tagging options (such as language options). The
special type nosubtypes
may be
specified to disallow use of this index by named
subtypes. Note: changing index settings requires
rebuilding indices, see slapindex(8).
Specify the file protection mode that newly created database index files should have. The default is 0600.