SLAPD-BDB(5)

NAME
slapd-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> minutes have passed since the last checkpoint. Both arguments default to zero, in which case they are ignored. See the Berkeley 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 database and associated indexes live. A separate directory must be specified for each database. The default is /var/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 performance, 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 evaluation. 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 particular 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 ALSO
slapd.conf(5), slapd(8), slapadd(8), slapcat(8), slapindex(8).