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Autovacuum and frequent pg_bulkload

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Hello,

i use PostgreSql 8.4.22 and two times a day, i import logs wth pg_bulkload and i delete old data. I move some millions of records in a day.

I noticed that only autovacuum seems not to be able to free unused space.
I need a periodical vacuum full but this operations takes many hours.

Do you think it is due to pk_bulkload that is not able to "see" free-marked space to use when loading new data?

Thank you,
/F

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