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Add integrity-checking functions to pg_visibility.

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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.
This commit is contained in:
Robert Haas
2016-06-15 14:33:58 -04:00
parent 38e9f90a22
commit e472ce9624
7 changed files with 376 additions and 4 deletions
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contrib/pg_visibility/pg_visibility.control
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@ -1,5 +1,5 @@
# pg_visibility extension
comment = 'examine the visibility map (VM) and page-level visibility info'
default_version = '1.0'
default_version = '1.1'
module_pathname = '$libdir/pg_visibility'
relocatable = true