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When do vacuumed pages/tuples become available for reuse?

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Subject: When do vacuumed pages/tuples become available for reuse?
From: rihad <rihad@xxxxxxx>
Date: Thu, 11 Apr 2019 11:19:43 +0400
Reply-to: rihad <rihad@xxxxxxx>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

If an autovacuum job on a huge table runs for 5-6 hours, do its freedpages/tuples become available for reuse immediately when they are markedas free, or only at the end of the multi-hour vacuum operation?

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