I now have 8 hours worth of snapshots from pg_stat_activity and
pg_locks (16 snapshots from each table/view). I have turned off
collection at this point, but I am still able to query pg_locks:
# SELECT mode, count(mode) AS count FROM pg_locks GROUP BY mode ORDER BY mode;
mode | count
------------------+---------
AccessShareLock | 291
ExclusiveLock | 19
RowExclusiveLock | 4
RowShareLock | 1
SIReadLock | 7287531
(5 rows)
SIReadLocks continue to grow. It seems, in general, that our
application code over uses Serializable... we have produced a patch
that demotes some heavy-hitting queries down to Read Committed, and we
will see if this makes an impact on the number of SIReadLocks.
Is it interesting that only 101557 out of 7 million SIReadLocks have a
pid associated with them?
-Dave Owens
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