Sean Chen <zysc...@gmail.com> wrote: > 1, delete records ... > 2, insert records ... > > if I add "vacuum analyze" in-between this two steps, will it help > on the performance on the insert? Assuming there are no long-running transactions which would still be able to see the deleted rows, a VACUUM between those statements would allow the INSERT to re-use the space previously occupied by the deleted rows, rather than possibly needing to allocate new space from the OS. -Kevin
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