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Date: Thu, 24 May 2007 08:28:06 -0700 (PDT)
From: jing han <jing_han_66@yahoo.com>
Subject: transactionID wraparound problem
To: pgsql-interfaces@postgresql.org
MIME-Version: 1.0
Content-Type: text/plain; charset=ascii
Message-ID: <924920.77151.qm@web53510.mail.re2.yahoo.com>

Hello,

In our project, we create one database named mydbname.

when I use 

select datname from pg_database;

I got:

 datname  
-----------
 postgres
 mydbname
 template1
 template0

According to the postgresql document, in order to prevent transaction ID wraparound failures,
in my code, I use:

SELECT datname, age(datfrozenxid) FROM pg_database; 

  datname  |    age     
-----------+------------
 postgres  | 1086137251
 mydbname  | 1073771662
 template1 | 1086137306
 template0 |   13977307


to check if age of postgres, template1, mydbname are over 1500000000,

if one of them age number is over 1500000000, for example, postgres age number is over 1500000000
I do psql --username=postgres -c 'VACUUM full' -d postgres

I have to do vacuum on template1, mydbname, and postgres, but not at the same time.


Is this the correct way to get rid of transaction ID wraparound failure?

Any answer will be appreciated.
jing


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