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robertmhaasrobertmhaas
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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.
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-4
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7 files changed

+376
-4
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‎contrib/pg_visibility/Makefile

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@@ -4,7 +4,7 @@ MODULE_big = pg_visibility
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OBJS = pg_visibility.o $(WIN32RES)
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EXTENSION = pg_visibility
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DATA = pg_visibility--1.0.sql
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DATA = pg_visibility--1.1.sql pg_visibility--1.0--1.1.sql
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PGFILEDESC = "pg_visibility - page visibility information"
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ifdef USE_PGXS

‎contrib/pg_visibility/pg_visibility--1.0--1.1.sql

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/* contrib/pg_visibility/pg_visibility--1.0--1.1.sql */
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-- complain if script is sourced in psql, rather than via ALTER EXTENSION
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\echo Use "ALTER EXTENSION pg_visibility UPDATE TO '1.1'" to load this file. \quit
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CREATE FUNCTION pg_check_frozen(regclass, t_ctid OUT tid)
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RETURNS SETOF tid
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AS 'MODULE_PATHNAME', 'pg_check_frozen'
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LANGUAGE C STRICT;
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CREATE FUNCTION pg_check_visible(regclass, t_ctid OUT tid)
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RETURNS SETOF tid
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AS 'MODULE_PATHNAME', 'pg_check_visible'
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LANGUAGE C STRICT;
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REVOKE ALL ON FUNCTION pg_check_frozen(regclass) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_check_visible(regclass) FROM PUBLIC;

‎contrib/pg_visibility/pg_visibility--1.0.sql renamed to ‎contrib/pg_visibility/pg_visibility--1.1.sql

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@@ -1,4 +1,4 @@
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/* contrib/pg_visibility/pg_visibility--1.0.sql */
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/* contrib/pg_visibility/pg_visibility--1.1.sql */
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION
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\echo Use "CREATE EXTENSION pg_visibility" to load this file. \quit
@@ -44,9 +44,24 @@ RETURNS record
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AS 'MODULE_PATHNAME', 'pg_visibility_map_summary'
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LANGUAGE C STRICT;
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-- Show tupleids of non-frozen tuples if any in all_frozen pages
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-- for a relation.
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CREATE FUNCTION pg_check_frozen(regclass, t_ctid OUT tid)
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RETURNS SETOF tid
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AS 'MODULE_PATHNAME', 'pg_check_frozen'
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LANGUAGE C STRICT;
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-- Show tupleids of dead tuples if any in all_visible pages for a relation.
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CREATE FUNCTION pg_check_visible(regclass, t_ctid OUT tid)
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RETURNS SETOF tid
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AS 'MODULE_PATHNAME', 'pg_check_visible'
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LANGUAGE C STRICT;
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-- Don't want these to be available to public.
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REVOKE ALL ON FUNCTION pg_visibility_map(regclass, bigint) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility(regclass, bigint) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility_map(regclass) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility(regclass) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_visibility_map_summary(regclass) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_check_frozen(regclass) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_check_visible(regclass) FROM PUBLIC;

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