SLAPD-BDB(5)SLAPD-BDB(5)NAMEslapd-bdb - BDB backend to slapd
SYNOPSIS
/etc/openldap/slapd.conf
DESCRIPTION
The BDB backend to slapd(8) is the recommended backend for a normal
slapd database. It uses the Sleepycat BerkelyDB package to store data.
It makes extensive use of indexing and caching to speed data access.
CONFIGURATION
These slapd.conf options apply to the BDB backend database. That is,
they must follow a "database bdb" line and come before any subsequent
"backend" or "database" lines. Other database options are described in
the slapd.conf(5) manual page.
cachesize <integer>
Specify the size in entries of the in-memory cache maintained by
the BDB backend database instance. The default is 1000 entries.
checkpoint <kbyte> <min>
Specify the frequency for checkpointing the database transaction
log. A checkpoint operation flushes the database buffers to
disk and writes a checkpoint record in the log. The checkpoint
will occur if either <kbyte> data has been written or <min> min‐
utes have passed since the last checkpoint. Both arguments
default to zero, in which case they are ignored. See the Berke‐
ley DB reference guide for more details.
dbnosync
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.
directory <directory>
Specify the directory where the BDB files containing this data‐
base and associated indexes live. A separate directory must be
specified for each database. The default is /var/db/openl‐
dap/openldap-data.
dirtyread
Allow reads of modified but not yet committed data. Usually
transactions are isolated to prevent other operations from
accessing uncommitted data. This option may improve perfor‐
mance, but may also return inconsistent results if the data
comes from a transaction that is later aborted. In this case,
the modified data is discarded and a subsequent search will
return a different result.
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.
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 nolang may be specified to
disallow use of this index by language subtypes. 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).
lockdetect {oldest|youngest|fewest|random|default}
Specify which transaction to abort when a deadlock is detected.
The default is the same as random.
mode <integer>
Specify the file protection mode that newly created database
index files should have. The default is 0600.
searchstack <depth>
Specify the depth of the stack used for search filter evalua‐
tion. Search filters are evaluated on a stack to accomodate
nested AND / OR clauses. An individual stack is assigned to each
server thread. The depth of the stack determines how complex a
filter can be evaluated without requiring any additional memory
allocation. Filters that are nested deeper than the search stack
depth will cause a separate stack to be allocated for that par‐
ticular search operation. These allocations can have a major
negative impact on server performance, but specifying too much
stack will also consume a great deal of memory. Each search
stack uses 512K bytes per level. The default stack depth is 16,
thus 8MB per thread is used.
FILES
/etc/openldap/slapd.conf
default slapd configuration file
SEE ALSOslapd.conf(5), slapd(8), slapadd(8), slapcat(8), slapindex(8).
OpenLDAP 2.1.X RELEASEDATE SLAPD-BDB(5)
