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2 Commits

Author SHA1 Message Date
Robert Haas
e472ce9624 Add integrity-checking functions to pg_visibility. 
The new pg_check_visible() and pg_check_frozen() functions can be used to
verify that the visibility map bits for a relation's data pages match the
actual state of the tuples on those pages.

Amit Kapila and Robert Haas, reviewed (in earlier versions) by Andres
Freund.  Additional testing help by Thomas Munro.
 2016-06-15 14:33:58 -04:00
Robert Haas
ba0a198fb1 Add pg_visibility contrib module. 
This lets you examine the visibility map as well as page-level
visibility information.  I initially wrote it as a debugging aid,
but was encouraged to polish it for commit.

Patch by me, reviewed by Masahiko Sawada.

Discussion: 56D77803.6080503@BlueTreble.com
 2016-03-08 08:42:01 -05:00