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From Looserof7
Subject WAL records
Date
Msg-id CAAeppxYd9_hvumP9UaxFBBGatCVR6bxumduF8-wiXdyAJPMXuA@mail.gmail.com
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Responses Re: WAL records
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I have started to learn postgresql. While going through the WAL dump saw the below records,

rmgr: Heap2       len (rec/tot):     60/    60, tx:          0, lsn: 4F/CFF1F0F8, prev 4F/CFF1EB70, desc: CLEAN remxid 0, blkref #0: rel 1663/16385/1259 blk 1301

rmgr: Heap2       len (rec/tot):     60/    60, tx:          0, lsn: 4F/CF26F808, prev 4F/CF26F7C0, desc: CLEAN remxid 0, blkref #0: rel 1663/16385/3312732 blk 2634

rmgr: Heap2       len (rec/tot):     56/    56, tx:   79718109, lsn: 4F/CF96D970, prev 4F/CF96D930, desc: CLEAN remxid 0, blkref #0: rel 1663/16385/209012 blk 6621


Wanted to know more about these,

      1. Are "CLEAN" vacuum records ? If not, what are those ?
      2. Why is the transaction id "0" ?
      3. What does these records do ?

Postgresql version : 10.6

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