Re: stale WAL files?
От
Michael Paquier
Тема
Re: stale WAL files?
Дата
Msg-id
20190329125811.GF1954@paquier.xyz
Ответ на
Re: stale WAL files? (Rob Sargent)
Список
Дерево обсуждения
stale WAL files? Rob Sargent <robjsargent@gmail.com>
Re: stale WAL files? Adrian Klaver <adrian.klaver@aklaver.com>
On Thu, Mar 28, 2019 at 09:53:16AM -0600, Rob Sargent wrote: > This is pg10 so it's pg_wal. ls -ltr > > > -rw-------. 1 postgres postgres 16777216 Mar 16 16:33 > 0000000100000CEA000000B1 > -rw-------. 1 postgres postgres 16777216 Mar 16 16:33 > 0000000100000CEA000000B2 > > ... 217 more on through to ... > > -rw-------. 1 postgres postgres 16777216 Mar 16 17:01 > 0000000100000CEA000000E8 > -rw-------. 1 postgres postgres 16777216 Mar 16 17:01 > 0000000100000CEA000000E9 > -rw-------. 1 postgres postgres 16777216 Mar 28 09:46 > 0000000100000CEA0000000E In Postgres 10 and older versions, the server keeps WAL segment for the last completed segment, and the previous completed segment. So even if a checkpoint is issued, the current WAL insert point is never really going to be on the first segment in pg_wal. Isn't that the origin of what you think is a problem? So, say, if you issue a checkpoint again, don't you see 0000000100000CEA000000B1 going away? In Postgres 11, WAL segments worth only one checkpoint are kept around. -- Michael
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