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From: Zubkovsky, Sergey <[email protected]>
To: [email protected]
Subject: pg_total_relation_size() and CHECKPOINT
Date: Thu, 13 Mar 2008 22:49:58 +0300
Message-ID: <[email protected]> (raw)

Hello,

 

I've detected that a result value of pg_total_relation_size() for an
actively updated table might be significantly differ from a result that
is returned after explicit CHECKPOINT command execution.

 

select version(); 

"PostgreSQL 8.2.6 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC)
3.4.2 (mingw-special)"

 

I understand the reasons of such behavior: cache buffers must be flushed
in order to be sure that pg_total_relation_size() result will be like we
expect.

Is this right?

If so I think it would be very useful to add a description of this
peculiarity to the PG documentation.

 

 

Thanks in advance,

Zubkovsky Sergey

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