Hey guys,
We are running our own private koji instance. We are running 1.6 on el5.
Lately this query takes 20mins or so to execute :
SELECT host.id,name,arches,task_load,capacity FROM host
JOIN sessions USING (user_id)
WHERE enabled = TRUE AND ready = TRUE
AND expired = FALSE
AND master IS NULL
AND update_time > NOW() - '5 minutes'::interval
It looks like the 'sessions' table is the culprit. Indeed SELECTing
'host' is immediate whereas SELECT count(id) from 'sessions' takes 15
seconds for only 408312 rows... looks like a vacuum problem you would
say. You are right but my question is why do I have so many sessions
rows ? Can 'sessions' be truncated ? I am just wondering if it's a known
issue to not clean the sessions tables or if I need to tune my
autovacuum to work properly :)
Cheers,
Thomas
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