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Set PD_ALL_VISIBLE and visibility map bits in COPY FREEZE

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Make sure COPY FREEZE marks the pages as PD_ALL_VISIBLE and updates the
visibility map. Until now we only marked individual tuples as frozen,
but page-level flags were not updated, so the first VACUUM after the
COPY FREEZE had to rewrite the whole table.

This is a fairly old patch, and multiple people worked on it. The first
version was written by Jeff Janes, and then reworked by Pavan Deolasee
and Anastasia Lubennikova.

Author: Anastasia Lubennikova, Pavan Deolasee, Jeff Janes
Reviewed-by: Kuntal Ghosh, Jeff Janes, Tomas Vondra, Masahiko Sawada,
             Andres Freund, Ibrar Ahmed, Robert Haas, Tatsuro Ishii,
             Darafei Praliaskouski
Discussion: https://postgr.es/m/CABOikdN-ptGv0mZntrK2Q8OtfUuAjqaYMGmkdU1dCKFtUxVLrg@mail.gmail.com
Discussion: https://postgr.es/m/CAMkU%3D1w3osJJ2FneELhhNRLxfZitDgp9FPHee08NT2FQFmz_pQ%40mail.gmail.com
This commit is contained in:
Tomas Vondra
2021-01-17 22:11:39 +01:00
parent 0c7d3bb99f
commit 7db0cd2145
5 changed files with 230 additions and 8 deletions
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77
contrib/pg_visibility/sql/pg_visibility.sql
View File

@ -94,6 +94,82 @@ select count(*) > 0 from pg_visibility_map_summary('test_partition');
select * from pg_check_frozen('test_partition'); -- hopefully none
select pg_truncate_visibility_map('test_partition');
-- test copy freeze
create table copyfreeze (a int, b char(1500));
-- load all rows via COPY FREEZE and ensure that all pages are set all-visible
-- and all-frozen.
begin;
truncate copyfreeze;
copy copyfreeze from stdin freeze;
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\.
commit;
select * from pg_visibility_map('copyfreeze');
select * from pg_check_frozen('copyfreeze');
-- load half the rows via regular COPY and rest via COPY FREEZE. The pages
-- which are touched by regular COPY must not be set all-visible/all-frozen. On
-- the other hand, pages allocated by COPY FREEZE should be marked
-- all-frozen/all-visible.
begin;
truncate copyfreeze;
copy copyfreeze from stdin;
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\.
copy copyfreeze from stdin freeze;
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\.
commit;
select * from pg_visibility_map('copyfreeze');
select * from pg_check_frozen('copyfreeze');
-- Try a mix of regular COPY and COPY FREEZE.
begin;
truncate copyfreeze;
copy copyfreeze from stdin freeze;
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\.
copy copyfreeze from stdin;
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\.
copy copyfreeze from stdin freeze;
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\.
commit;
select * from pg_visibility_map('copyfreeze');
select * from pg_check_frozen('copyfreeze');
-- cleanup
drop table test_partitioned;
drop view test_view;
@ -103,3 +179,4 @@ drop server dummy_server;
drop foreign data wrapper dummy;
drop materialized view matview_visibility_test;
drop table regular_table;
drop table copyfreeze;