Red Hat DIRECTORY SERVER 7.1, Administrator'S Manual, Page: 485 / 652

Tuning Database Performance
Chapter 14 Tuning Directory Server Performance 485
directory databases after a disorderly shutdown and require more disk space due
to large database transaction log files. Therefore, you should only modify this
attribute if you are familiar with database optimization and can fully assess the
effect of the change.
To modify the checkpoint interval while the server is running, use the
ldapmodify
command-line utility to add the
nsslapd-db-checkpoint-interval
attribute to
the
cn=config,cn=ldbm database,cn=plugins,cn=config
entry.
For more information on the syntax of the
nsslapd-db-checkpoint-interval
attribute, refer to the Red Hat Directory Server Configuration, Command, and File
Reference . For instructions on using
ldapmodify
, refer to “Adding and Modifying
Entries Using ldapmodify,” on page 58.
Disabling Durable Transactions
Durable transaction logging means that the temporary database transaction log is,
in fact, physically written to disk.
When durable transaction logging is disabled, every directory database operation
is written to the database transaction log file but may not be physically written to
disk immediately. If a directory change was written to the logical database
transaction log file but not physically written to disk at the time of a system crash,
you cannot recover the change. When durable transactions are disabled, the
recovered database is consistent but does not reflect the results of any LDAP write
operations that completed just before the system crash.
By default, durable database transaction logging is enabled. To disable durable
transaction logging, use the following procedure:
1.
Stop the Directory Server.
For instructions, refer to “Starting and Stopping the Server from the
Command-Line,” on page 38.
2.
Use the
ldapmodify
command-line utility to add the
nsslapd-db-durable-transactions
attribute to the
cn=config,cn=ldbm
database,cn=plugins,cn=config
entry, and set the value of this attribute to
off
.
For information on the syntax of the
nsslapd-db-durable-transactions
attribute, see the Red Hat Directory Server Configuration, Command, and File
Reference . For instructions on using
ldapmodify
, refer to “Adding and
Modifying Entries Using ldapmodify,” on page 58.
3.
Restart the Directory Server.