Re: Why will vacuum not end?

From: "Shea,Dan [CIS]" <Dan(dot)Shea(at)ec(dot)gc(dot)ca>
To: 'Christopher Kings-Lynne' <chriskl(at)familyhealth(dot)com(dot)au>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Why will vacuum not end?
Date: 2004-04-23 18:19:04
Message-ID: F2D63B916C88C14D9B59F93C2A5DD33F0B924E@cisxa.cmc.int.ec.gc.ca
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PWFPM_DEV=# select * from pg_locks;
relation | database | transaction | pid | mode |
granted
----------+----------+-------------+-------+--------------------------+-----
----
17472 | 17347 | | 2618 | ShareUpdateExclusiveLock | t
| | 10858533 | 28778 | ExclusiveLock | t
17472 | 17347 | | 2618 | ShareUpdateExclusiveLock | t
| | 10803814 | 2618 | ExclusiveLock | t
16759 | 17347 | | 28778 | AccessShareLock | t
(5 rows)

PWFPM_DEV=#

17347 is the database PWFPM_DEV iod, The pids are below

[root(at)murphy root]# ps -ef |grep 28778|grep -v "grep"
postgres 28778 504 0 18:06 ? 00:00:00 postgres: scores PWFPM_DEV
[local] idle
[root(at)murphy root]# ps -ef |grep 2618|grep -v "grep"
postgres 2618 504 8 Apr22 ? 02:31:00 postgres: postgres PWFPM_DEV
[local] VACUUM
[root(at)murphy root]#
A vacuum is running now. I restarted the database, set vacuum_mem =
'196608'; and started a new vacuum. I also stopped inserting into the
database.
I hoping I will get some results.

PWFPM_DEV=# select now();vacuum verbose analyze forecastelement;select
now();
now
-------------------------------
2004-04-22 13:38:02.083592+00
(1 row)

INFO: vacuuming "public.forecastelement"
INFO: index "forecastelement_rwv_idx" now contains 391385895 row versions
in 5051132 pages
DETAIL: 27962015 index row versions were removed.
771899 index pages have been deleted, 496872 are currently reusable.
CPU 4499.54s/385.76u sec elapsed 55780.91 sec.
INFO: "forecastelement": removed 33554117 row versions in 737471 pages
DETAIL: CPU 135.61s/83.99u sec elapsed 1101.26 sec.
-----Original Message-----
From: Christopher Kings-Lynne [mailto:chriskl(at)familyhealth(dot)com(dot)au]
Sent: Tuesday, April 20, 2004 9:26 PM
To: Shea,Dan [CIS]
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] Why will vacuum not end?

> No, but data is constantly being inserted by userid scores. It is
postgres
> runnimg the vacuum.
> Dan.

Well, inserts create some locks - perhaps that's the problem...

Otherwise, check the pg_locks view to see if you can figure it out.

Chris

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