Chapter 3. Plug-in Implemented Server Functionality Reference
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Parameter
Description
Valid Range
500 kilobytes to 4 gigabytes for 32-bit platforms
and 500 kilobytes to 2^64-1 for 64-bit platforms
Default Value
10000000 (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
. To change the
checkpoint interval, add the attribute to
dse.ldif
. This attribute can be dynamically modified using
ldapmodify
. 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
Description
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 Technical Support or Red Hat Professional Services.
Parameter
Description
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
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