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Re: age(datfrozenxid) - Mailing list pgsql-general

From Tom Lane
Subject Re: age(datfrozenxid)
Date
Msg-id 4170.1055273058@sss.pgh.pa.us
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In response to age(datfrozenxid)  (<mallah@trade-india.com>)
List pgsql-general
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<mallah@trade-india.com> writes:
> can anyone please tell  what does
>  SELECT age(datfrozenxid)  from pg_database
> signify and why it keeps increasing monotonically ?

Basically it measures the time since you last vacuumed each database.
See the Admin Guide:
http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=routine-vacuuming.html#VACUUM-FOR-WRAPAROUND

            regards, tom lane

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