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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 at http://www.oracle.com/technology/documentation/berkeley-db/db/api_c/env_set_cachesize.html.

Attempting to set a value that is not a number or is too big for a 32-bit signed integer returns an

LDAP_UNWILLING_T O_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 Descript ion

Entry DN cn=config, cn=ldbm database, cn=plugins,

cn=config

Valid Range 500 kilobytes to 4 gigabytes for 32-bit platforms

and 500 kilobytes to 2^64-1 for 64-bit platforms

Default Value 100000 00 (bytes)

Syntax Integer

Example nsslapd-dbcachesize: 10000000

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. The

nsslapd-db-checkpoint-interval attribute is absent from dse.ldif. T o change the checkpoint

interval, add the attribute to dse.ldif. T his attribute can be dynamically modified using ldapm odify.

For further information on modifying this attribute, see the "Tuning Directory Server Performance"

chapter in the Directory Server Administrator's Guide.

This attribute is provided only for system modification/diagnostics and should be changed only with the

guidance of Red Hat technical support or Red Hat professional services. Inconsistent settings of this

attribute and other configuration attributes may cause the Directory Server to be unstable.

For more information on database transaction logging, refer to the "Monitoring Server and Database

Activity" chapter in the Directory Server Administrator's Guide.

Parameter Descript ion

Entry DN cn=config, cn=ldbm database, cn=plugins,

cn=config

Valid Range 10 to 300 seconds

Default Value 60

Syntax Integer

Example nsslapd-db-checkpoint-interval: 120

3.4 .1.7 . nsslapd-db-circular-logging

This attribute specifies circular logging for the transaction log files. If this attribute is switched off, old

transaction log files are not removed and are kept renamed as old log transaction files. Turning circular

logging off can severely degrade server performance and, as such, should only be modified with the

guidance of Red Hat T echnical Support or Red Hat Professional Services.

Parameter Descript ion

Entry DN cn=config, cn=ldbm database, cn=plugins,

cn=config

Valid Values on | off

Default Value on

Syntax DirectoryString

Example nsslapd-db-circular-logging: on

3.4 .1.8 . nsslapd-db-debug

This attribute specifies whether additional error information is to be reported to Directory Server. To

report error information, set the parameter to on. T his parameter is meant for troubleshooting; enabling

the parameter may slow down the Directory Server.

Parameter Descript ion

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