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e472ce9624
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.
68 lines
2.5 KiB
SQL
68 lines
2.5 KiB
SQL
/* 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
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-- Show visibility map information.
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CREATE FUNCTION pg_visibility_map(regclass, blkno bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean)
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RETURNS record
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AS 'MODULE_PATHNAME', 'pg_visibility_map'
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LANGUAGE C STRICT;
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-- Show visibility map and page-level visibility information.
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CREATE FUNCTION pg_visibility(regclass, blkno bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean,
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pd_all_visible OUT boolean)
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RETURNS record
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AS 'MODULE_PATHNAME', 'pg_visibility'
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LANGUAGE C STRICT;
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-- Show visibility map information for each block in a relation.
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CREATE FUNCTION pg_visibility_map(regclass, blkno OUT bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean)
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RETURNS SETOF record
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AS 'MODULE_PATHNAME', 'pg_visibility_map_rel'
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LANGUAGE C STRICT;
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-- Show visibility map and page-level visibility information for each block.
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CREATE FUNCTION pg_visibility(regclass, blkno OUT bigint,
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all_visible OUT boolean,
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all_frozen OUT boolean,
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pd_all_visible OUT boolean)
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RETURNS SETOF record
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AS 'MODULE_PATHNAME', 'pg_visibility_rel'
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LANGUAGE C STRICT;
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-- Show summary of visibility map bits for a relation.
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CREATE FUNCTION pg_visibility_map_summary(regclass,
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OUT all_visible bigint, OUT all_frozen bigint)
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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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