We have a frequently updated (peak > 5/sec) table with about 1000 rows.
We run VACCUM FULL on this table every 5 minutes.
The regular updates are not long in duration, and the vacuum is fast, so they
do not produce noticeable delays.
When we run a pg_dump on the database:
- the dump takes a long standing AccessShareLock lock on this table
(the database is large, and the table is locked for the duration).
- the regular updates run quite happily
- the VACUUM FULL comes along and asks for a AccessExclusiveLock (which is not granted due to PG_DUMP).
- the regular updates hang until the dump completes
Is it possible to set up a vacuum to fail if a lock is not granted in
a limited period of time (eg. 1 minute)?
We could use lock files to synchronize our dumps with our vacuums, but
were hoping for a way of managing this within the DB so that ad-hoc dumps
will not cause a problem.
----------------------------------------------------------------
Philip Warner | __---_____
Albatross Consulting Pty. Ltd. |----/ - \
(A.B.N. 75 008 659 498) | /(@) ______---_
Tel: (+61) 0500 83 82 81 | _________ \
Fax: (+61) 03 5330 3172 | ___________ |
Http://www.rhyme.com.au | / \| | --________--
PGP key available upon request, | /
and from pgp.mit.edu:11371 |/
