Red Hat DIRECTORY SERVER 8.0 Command Reference Manual page 127

Parameter
Entry DN
Valid Range
Default Value
Syntax
Example
3.4.1.5. nsslapd-dbcachesize
This performance tuning-related attribute specifies the database index cache size, and is one of the
most important values for controlling how much physical RAM the directory server uses.
This is not the entry cache. This is the amount of memory the Berkeley database backend will use
to cache the indexes (the .db4 files) and other files. This value is passed to the Berkeley DB API
function set_cachesize. If automatic cache resizing is activated, this attribute is overridden when
the server replaces these values with its own guessed values at a later stage of the server startup. For
more technical information on this attribute, see the cache size section of the Berkeley DB reference
guide.
Attempting to set a value that is not a number or is too big for a 32-bit signed integer returns an
LDAP_UNWILLING_TO_PERFORM error message with additional error information explaining the
problem.
The server has to be restarted for changes to this attribute to go into effect.
Parameter
Entry DN
Valid Range
Default Value
Syntax
Example
NOTE
On Solaris, the nsslapd-dbcachesize attribute has no effect on performance because
the disk/filesystem cache overrides it.
3.4.1.6. nsslapd-db-checkpoint-interval
This sets the amount of time in seconds after which the Directory Server sends a checkpoint entry to
the database transaction log. The database transaction log contains a sequential listing of all recent
database operations and is used for database recovery only. A checkpoint entry indicates which
database operations have been physically written to the directory database. The checkpoint entries
are used to determine where in the database transaction log to begin recovery after a system failure.
Database Attributes under cn=config, cn=ldbm database, cn=plugins, cn=config
Description
cn=config, cn=ldbm database, cn=plugins,
cn=config
0 to 99
50 (This will not necessarily optimize operations.)
Integer
nsslapd-cache-autosize-split: 50
Description
cn=config, cn=ldbm database, cn=plugins,
cn=config
500 kilobytes to 4 gigabytes for 32-bit platforms
and 500 kilobytes to 2^64-1 for 64-bit platforms
10000000 bytes
Integer
nsslapd-dbcachesize: 10,000,000
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