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* documention wrong or just not clear?
@ 2007-03-22 21:15 Robert Treat <[email protected]>
0 siblings, 1 reply; 2+ messages in thread
From: Robert Treat @ 2007-03-22 21:15 UTC (permalink / raw)
To: pgsql-docs
In http://www.postgresql.org/docs/8.2/static/routine-vacuuming.html it says:
"The age column measures the number of transactions from the cutoff XID to the
current transaction's XID. Immediately after a VACUUM, age(relfrozenxid)
should be a little more than the vacuum_freeze_min_age setting that was used
(more by the number of transactions started since the VACUUM started). "
However my results don't seem to bear that out:
postgres=# show vacuum_freeze_min_age;
vacuum_freeze_min_age
-----------------------
100000000
(1 row)
postgres=# VACUUM ;
VACUUM
postgres=# select min (age(relfrozenxid)) from pg_class where relkind = 'r';
min
--------
253045
(1 row)
--
Robert Treat
Build A Brighter LAMP :: Linux Apache {middleware} PostgreSQL
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: documention wrong or just not clear?
@ 2007-03-22 21:29 Tom Lane <[email protected]>
parent: Robert Treat <[email protected]>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2007-03-22 21:29 UTC (permalink / raw)
To: Robert Treat <[email protected]>; +Cc: pgsql-docs
Robert Treat <[email protected]> writes:
> In http://www.postgresql.org/docs/8.2/static/routine-vacuuming.html it says:
> "The age column measures the number of transactions from the cutoff XID to the
> current transaction's XID. Immediately after a VACUUM, age(relfrozenxid)
> should be a little more than the vacuum_freeze_min_age setting that was used
> (more by the number of transactions started since the VACUUM started). "
> However my results don't seem to bear that out:
I would imagine that your database (or at least some of your tables) are
not yet vacuum_freeze_min_age transactions old.
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
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