50 lines
2.3 KiB
Plaintext
50 lines
2.3 KiB
Plaintext
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SET max_parallel_maintenance_workers TO 4;
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SET min_parallel_index_scan_size TO '128kB';
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-- Bug #17245: Make sure that we don't totally fail to VACUUM individual indexes that
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-- happen to be below min_parallel_index_scan_size during parallel VACUUM:
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CREATE TABLE parallel_vacuum_table (a int) WITH (autovacuum_enabled = off);
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INSERT INTO parallel_vacuum_table SELECT i from generate_series(1, 10000) i;
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-- Parallel VACUUM will never be used unless there are at least two indexes
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-- that exceed min_parallel_index_scan_size. Create two such indexes, and
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-- a third index that is smaller than min_parallel_index_scan_size.
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CREATE INDEX regular_sized_index ON parallel_vacuum_table(a);
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CREATE INDEX typically_sized_index ON parallel_vacuum_table(a);
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-- Note: vacuum_in_leader_small_index can apply deduplication, making it ~3x
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-- smaller than the other indexes
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CREATE INDEX vacuum_in_leader_small_index ON parallel_vacuum_table((1));
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-- Verify (as best we can) that the cost model for parallel VACUUM
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-- will make our VACUUM run in parallel, while always leaving it up to the
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-- parallel leader to handle the vacuum_in_leader_small_index index:
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SELECT EXISTS (
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SELECT 1
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FROM pg_class
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WHERE oid = 'vacuum_in_leader_small_index'::regclass AND
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pg_relation_size(oid) <
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pg_size_bytes(current_setting('min_parallel_index_scan_size'))
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) as leader_will_handle_small_index;
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leader_will_handle_small_index
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--------------------------------
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t
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(1 row)
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SELECT count(*) as trigger_parallel_vacuum_nindexes
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FROM pg_class
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WHERE oid in ('regular_sized_index'::regclass, 'typically_sized_index'::regclass) AND
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pg_relation_size(oid) >=
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pg_size_bytes(current_setting('min_parallel_index_scan_size'));
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trigger_parallel_vacuum_nindexes
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----------------------------------
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2
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(1 row)
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-- Parallel VACUUM with B-Tree page deletions, ambulkdelete calls:
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DELETE FROM parallel_vacuum_table;
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VACUUM (PARALLEL 4, INDEX_CLEANUP ON) parallel_vacuum_table;
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-- Since vacuum_in_leader_small_index uses deduplication, we expect an
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-- assertion failure with bug #17245 (in the absence of bugfix):
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INSERT INTO parallel_vacuum_table SELECT i FROM generate_series(1, 10000) i;
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RESET max_parallel_maintenance_workers;
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RESET min_parallel_index_scan_size;
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-- Deliberately don't drop table, to get further coverage from tools like
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-- pg_amcheck in some testing scenarios
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