Events Table Maintenance
- Table of Contents
- Introduction
- Manual Shrink
Introduction
The size on disk of the GreenArrow events table in Postgres can grow over
time, particularly if there is a service interruption with events delivery.
Periodically, the GreenArrow Event Notification System will rewrite the
events table to reduce this bloat if it accumulates. This is done only
if events are being actively delivered (there are no more than 100,000 events
in the queue) and if the table appears to be bloated.
Manual Shrink
If you recognize a need for the events table to be rewritten and it has
not automatically happened, you can manually invoke the greenarrow shrink_events_table command.
$ greenarrow shrink_events_table
- installing events trigger
- waiting for events table to be freed of transactions
- moving data from events to events__defrag1
- waiting for events__defrag2 table to be freed of transactions
- moving data from events__defrag2 back to events
- recording time of events table shrink
- events table shrink is complete