Our production RT instance (3.6.3 - old, I know) takes a really,
really long time to add and remove group members.
Our database is MySQL and the CachedGroupMembers table has the index:
I recall that index on Via is relevant for the shredder, so may be
it’s also relevant for removing a member as it also means dropping
records. Without full SQL log it’s hard to say. It’s better to write a
script that adds a user to a group and deletes him right after. Use
this script to collect all queries with hi-res timings. All queries
required to see queries that are executed many times even if those are
What can we do to improve the situation (yes, I would be upgrading if
that were possible at the moment)?
Would running shrink_cgm_table.pl be a good idea?
Shrinking would make lookups faster. Let’s say 30% faster as table
gets ~30% smaller. As far as I know there is no harm in running it on
Best regards, Ruslan.