181 lines
4.5 KiB
Plaintext
181 lines
4.5 KiB
Plaintext
create extension pg_surgery;
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-- create a normal heap table and insert some rows.
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-- use a temp table so that vacuum behavior doesn't depend on global xmin
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create temp table htab (a int);
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insert into htab values (100), (200), (300), (400), (500);
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-- test empty TID array
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select heap_force_freeze('htab'::regclass, ARRAY[]::tid[]);
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heap_force_freeze
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-------------------
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(1 row)
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-- nothing should be frozen yet
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select * from htab where xmin = 2;
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a
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---
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(0 rows)
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-- freeze forcibly
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select heap_force_freeze('htab'::regclass, ARRAY['(0, 4)']::tid[]);
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heap_force_freeze
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-------------------
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(1 row)
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-- now we should have one frozen tuple
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select ctid, xmax from htab where xmin = 2;
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ctid | xmax
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-------+------
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(0,4) | 0
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(1 row)
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-- kill forcibly
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select heap_force_kill('htab'::regclass, ARRAY['(0, 4)']::tid[]);
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heap_force_kill
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-----------------
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(1 row)
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-- should be gone now
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select * from htab where ctid = '(0, 4)';
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a
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---
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(0 rows)
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-- should now be skipped because it's already dead
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select heap_force_kill('htab'::regclass, ARRAY['(0, 4)']::tid[]);
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NOTICE: skipping tid (0, 4) for relation "htab" because it is marked dead
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heap_force_kill
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-----------------
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(1 row)
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select heap_force_freeze('htab'::regclass, ARRAY['(0, 4)']::tid[]);
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NOTICE: skipping tid (0, 4) for relation "htab" because it is marked dead
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heap_force_freeze
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-------------------
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(1 row)
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-- freeze two TIDs at once while skipping an out-of-range block number
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select heap_force_freeze('htab'::regclass,
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ARRAY['(0, 1)', '(0, 3)', '(1, 1)']::tid[]);
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NOTICE: skipping block 1 for relation "htab" because the block number is out of range
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heap_force_freeze
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-------------------
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(1 row)
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-- we should now have two frozen tuples
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select ctid, xmax from htab where xmin = 2;
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ctid | xmax
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-------+------
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(0,1) | 0
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(0,3) | 0
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(2 rows)
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-- out-of-range TIDs should be skipped
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select heap_force_freeze('htab'::regclass, ARRAY['(0, 0)', '(0, 6)']::tid[]);
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NOTICE: skipping tid (0, 0) for relation "htab" because the item number is out of range
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NOTICE: skipping tid (0, 6) for relation "htab" because the item number is out of range
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heap_force_freeze
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-------------------
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(1 row)
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-- set up a new table with a redirected line pointer
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-- use a temp table so that vacuum behavior doesn't depend on global xmin
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create temp table htab2(a int);
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insert into htab2 values (100);
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update htab2 set a = 200;
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vacuum htab2;
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-- redirected TIDs should be skipped
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select heap_force_kill('htab2'::regclass, ARRAY['(0, 1)']::tid[]);
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NOTICE: skipping tid (0, 1) for relation "htab2" because it redirects to item 2
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heap_force_kill
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-----------------
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(1 row)
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-- now create an unused line pointer
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select ctid from htab2;
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ctid
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-------
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(0,2)
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(1 row)
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update htab2 set a = 300;
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select ctid from htab2;
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ctid
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-------
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(0,3)
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(1 row)
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vacuum freeze htab2;
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-- unused TIDs should be skipped
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select heap_force_kill('htab2'::regclass, ARRAY['(0, 2)']::tid[]);
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NOTICE: skipping tid (0, 2) for relation "htab2" because it is marked unused
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heap_force_kill
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-----------------
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(1 row)
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-- multidimensional TID array should be rejected
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select heap_force_kill('htab2'::regclass, ARRAY[['(0, 2)']]::tid[]);
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ERROR: argument must be empty or one-dimensional array
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-- TID array with nulls should be rejected
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select heap_force_kill('htab2'::regclass, ARRAY[NULL]::tid[]);
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ERROR: array must not contain nulls
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-- but we should be able to kill the one tuple we have
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select heap_force_kill('htab2'::regclass, ARRAY['(0, 3)']::tid[]);
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heap_force_kill
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-----------------
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(1 row)
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-- materialized view.
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-- note that we don't commit the transaction, so autovacuum can't interfere.
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begin;
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create materialized view mvw as select a from generate_series(1, 3) a;
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select * from mvw where xmin = 2;
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a
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---
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(0 rows)
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select heap_force_freeze('mvw'::regclass, ARRAY['(0, 3)']::tid[]);
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heap_force_freeze
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-------------------
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(1 row)
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select * from mvw where xmin = 2;
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a
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---
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3
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(1 row)
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select heap_force_kill('mvw'::regclass, ARRAY['(0, 3)']::tid[]);
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heap_force_kill
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-----------------
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(1 row)
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select * from mvw where ctid = '(0, 3)';
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a
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---
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(0 rows)
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rollback;
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-- check that it fails on an unsupported relkind
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create view vw as select 1;
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select heap_force_kill('vw'::regclass, ARRAY['(0, 1)']::tid[]);
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ERROR: cannot operate on relation "vw"
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DETAIL: This operation is not supported for views.
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select heap_force_freeze('vw'::regclass, ARRAY['(0, 1)']::tid[]);
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ERROR: cannot operate on relation "vw"
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DETAIL: This operation is not supported for views.
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-- cleanup.
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drop view vw;
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drop extension pg_surgery;
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