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Re: is it safe to clear oroginal xlog after archiving it?

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On Thu, 4 Jun 2009, hubert depesz lubaczewski wrote:

is it safe, if i would do:
dd if=/dev/zero of=$ORIGINAL_XLOG_SEGMENT bs=1M count=16
before returning from archive_command script?

Nope. At that point, the files are still needed for crash recovery on that system. There will be a future point where a checkpoint will note the files aren't needed anymore, and at that point they'll be recycled (renamed with a new id and used again) or deleted. You can't change the files until then though, and that time can be several minutes after archive_command is called.

--
* Greg Smith gsmith@xxxxxxxxxxxxx http://www.gregsmith.com Baltimore, MD

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