Netscape NETSCAPE DIRECTORY SERVER 6.02, Руководство администратора

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Tuning Database Performance
428 Netscape Directory Server Administrator’s Guide • May 2002
Changing the Location of the Database
Transaction Log
By default, the database transaction log file is stored in the
/usr/netscape/servers/slapd-
serverID
/db
directory along with the database
files themselves. Because the purpose of the transaction log is to aid in the recovery
of a directory database that was shut down abnormally, it is a good idea to store
the database transaction log on a different disk from the one containing the
directory database. Storing the database transaction log on a separate physical disk
may also improve directory performance.
To change the location of the database transaction log file, use the following
procedure:
1.
Stop the Directory Server.
For instructions, refer to “Starting/Stopping the Server From the Console,” on
page 32.
2.
Use the
ldapmodify
command-line utility to add the
nsslapd-db-logdirectory
attribute to the
cn=config,cn=ldbm
database,cn=plugins,cn=config
entry. Provide the full path to the log
directory in the attribute.
For information on the
nsslapd-db-logdirectory
attribute syntax, see the
Netscape Directory Server Configuration, Command, and File Reference. For
instructions on using
ldapmodify
, refer to “Adding and Modifying Entries
Using ldapmodify,” on page 53.
3.
Restart Directory Server.
Changing the Database Checkpoint Interval
At regular intervals, the Directory Server writes operations logged in the
transaction log to the disk, and logs a checkpoint entry in the database transaction
log. By indicating which changes have already been written to the directory,
checkpoint entries indicate where to begin recovery from the transaction log, thus
speeding up the recovery process.
By default, the Directory Server is set up to send a checkpoint entry to the database
transaction log every 60 seconds. Increasing the checkpoint interval may increase
the performance of directory write operations. However, increasing the checkpoint
interval may also increase the amount of time required to recover directory