CESTLOG: statistics buffer is full

Hi,

We use PostgreSQL version 8.1.4. Autovacuum is on.
The message "CESTLOG: statistics buffer is full" appears repeatedly in the logfile of the database.
I searched on the Internet, but couldn't find much about this message.

What kind of statistics is being kept in the statistics buffer?
Why does this buffer usually fill up? too small? Is the work load on the database too high?
How can we solve the problem?

Kind regards,

Omar.

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