HP-UX Directory Server 8.1 configuration, command, and file reference

2.3.2 cn=changelog5,cn=config
Replication changelog configuration is stored in the cn=changelog5,cn=config entry. The
changelog behaves much like a database, and it has many of attributes also used by the ldbm
databases. The changelog entry supports the following attributes with the same meaning as for
databases:
The default values for the cache-related memory parameters (tuned for a single backend replicated
to a single consumer) are as follows:
• nsslapd-cachesize: 3000 (3000 entries)
• nsslapd-cachememsize: 10000000 (10 Mbyte)
When more backends are replicated or when one backend is replicated to more than one consumer,
tune the parameters as below:
nsslapd-cachesize = 2000*#repl_agreements_initiated_from_this_server
nsslapd-cachememsize = 5000000*#repl_agreements_initiated_from_this_server
Also, the relationship between the values assigned to the nsslapd-dbcachesize and
nsslapd-cachememsize parameters should be the same as the relationship that is described
in the database-tuning section.
The cn=changelog5,cn=config entry is an instance of the extensibleObject object class.
NOTE:
Two different types of changelogs are maintained by Directory Server. The first type, which is
stored here and referred to as the changelog, is used by multi-master replication; the second
changelog, which is actually a plug-in and referred to as the retro changelog, is for
compatibility with some legacy applications. See “Retro Changelog plug-in” for further
information about the Retro Changelog Plug-in.
2.3.2.1 nsslapd-changelogdir
This required attribute specifies the name of the directory in which the changelog database is
created. Whenever a changelog configuration entry is created, it must contain a valid directory;
otherwise, the operation is rejected. The GUI proposes by default that this database be stored in
/var/opt/dirsrv/slapd-instance_name/changelogdb.
NOTE:
If the cn=changelog5,cn=config entry is removed, any changelog database files that reside
in the directory specified in the nsslapd-changelogdir parameter are automatically removed.
If removal of these database files leaves the directory empty, the directory itself is also removed.
NOTE:
For performance reasons, store this database on a different physical disk.
The server has to be restarted for changes to this attribute to go into effect.
DescriptionParameter
cn=changelog5,cn=configEntry DN
Any valid path to the directory storing the changelogValid Values
NoneDefault Value
DirectoryStringSyntax
nsslapd-changelogdir: /var/opt/dirsrv/slapd-example/changelogdbExample
72 Core server configuration reference