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Add new 'old_snapshot' contrib module.

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You can use this to view the contents of the time to XID mapping
which the server maintains when old_snapshot_threshold != -1.
Being able to view that information may be interesting for users,
and it's definitely useful for figuring out whether the mapping
is being maintained correctly. It isn't, so that will need to be
fixed in a subsequent commit.

Patch by me, reviewed by Thomas Munro, Dilip Kumar, Hamid Akhtar.

Discussion: http://postgr.es/m/CA+TgmoY=aqf0zjTD+3dUWYkgMiNDegDLFjo+6ze=Wtpik+3XqA@mail.gmail.com
This commit is contained in:
Robert Haas
2020-09-24 13:55:47 -04:00
parent f5ea92e8d6
commit aecf5ee2bb
8 changed files with 236 additions and 0 deletions
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contrib/old_snapshot/old_snapshot.control Normal file
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# old_snapshot extension
comment = 'utilities in support of old_snapshot_threshold'
default_version = '1.0'
module_pathname = '$libdir/old_snapshot'
relocatable = true