Retro Changelog Plug-in Attributes2033.6. Retro Changelog Plug-in AttributesTwo different types of changelogs are maintained by Directory Server. The first type, referred to assimply a changelog, is used by multi-master replication, and the second changelog, a plug-in referredto as the retro changelog, is intended for use by LDAP clients for maintaining application compatibilitywith Directory Server 4.x versions.This Retro Changelog Plug-in is used to record modifications made to a supplier server. When thesupplier server's directory is modified, an entry is written to the Retro Changelog that contains both ofthe following:• A number that uniquely identifies the modification. This number is sequential with respect to otherentries in the changelog.• The modification action; that is, exactly how the directory was modified.It is through the Retro Changelog Plug-in that the changes performed to the Directory Server areaccessed using searches to cn=changelog suffix.3.6.1. nsslapd-changelogdirThis attribute specifies the name of the directory in which the changelog database is created the firsttime the plug-in is run. By default, the database is stored with all the other databases under /var/lib/dirsrv/slapd-instance_name/changelogdb.NOTEFor 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.Parameter DescriptionEntry DN cn=Retro Changelog Plugin, cn=plugins,cn=configValid Values Any valid path to the directoryDefault Value NoneSyntax DirectoryStringExample nsslapd-changelogdir: /var/lib/dirsrv/slapd-instance_name/changelogdb3.6.2. nsslapd-changelogmaxage (Max Changelog Age)This attribute specifies the maximum age of any entry in the changelog. The changelog containsa record for each directory modification and is used when synchronizing consumer servers. Eachrecord contains a timestamp. Any record with a timestamp that is older than the value specified in thisattribute is removed. If this attribute is absent, there is no age limit on changelog records, which is thedefault behavior since this attribute is not present by default.
