Here are guidelines on maintaining your Grouper implementation, including suggestions ot help keep your database manageable.
Pruning the Change Log
When updates are made in Grouper (group add, membership add, etc), updates are also made to the temp change log (grouper_change_log_entry_temp) as part of the same transaction. The Grouper Daemon later (by default every minute), moves these changes to grouper_change_log_entry with sequence numbers and also adds flattened notifications and permission notifications.
By default, change log entries are retained for 14 days in grouper_change_log_entry. This is configurable in grouper-loader.properties. Note that this option doesn't exist before 2.0.
# number of days to retain db rows in grouper_change_log_entry. -1 is forever. default is 14 loader.retain.db.change_log_entry.days=14
Pruning the Daemon logs
When the Grouper Daemon runs jobs, logs are kept in the grouper_loader_log table with information about the job, such as when it started, ended, and status. Note that these logs don't just get created for the jobs that load data into Grouper, but also for the other jobs that are run by the Grouper Daemon, such as the job to populate grouper_change_log_entry which runs every minute.
By default, these logs are retained for 7 days. This is also configurable in grouper-loader.properties.
# number of days to retain db logs in table grouperloader_log. -1 is forever. default is 7 loader.retain.db.logs.days=7
Pruning the User Audit logs
User Audit logs are created when updates are made in Grouper. These logs are stored in the grouper_audit_entry table. For 2.0, I think the only option for pruning these logs are by deleting them directly from the database.
Here's an example to delete rows based on time. Note that created_on is milliseconds from epoch.
delete from grouper_audit_entry where created_on < '1318599550575'
Pruning the Point in Time logs
Grouper has several tables that have names starting with "grouper_pit_" that are used to store point in time data. These tables are populated by the Grouper Daemon. If an object has been deleted from Grouper, the object remains in the point in time tables with an end date. Using GSH, you can delete objects in the point in time tables that have end dates. See Point in Time Auditing.