Hello, I have installed postgres 9.0 that is supposed has by default auto
vacuum enabled

 

But sometimes when I click over a table in the pgadmin, this application
recommend me to vacuum 

The message is:

"The estimated rowcount on the table XXX deviates significantly from the
actual rowcount. You should run VACUUM ANALYZE on this table.

 

Why this happened? The auto vacuum is not doing a good job?

 

Thanks

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