mirror of https://github.com/citusdata/citus.git
68 lines
2.6 KiB
PL/PgSQL
68 lines
2.6 KiB
PL/PgSQL
SELECT count(*) AS columnar_table_count FROM cstore.cstore_data_files \gset
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CREATE TABLE t(a int, b int) USING cstore_tableam;
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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INSERT INTO t SELECT i, i * i FROM generate_series(1, 10) i;
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INSERT INTO t SELECT i, i * i FROM generate_series(11, 20) i;
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INSERT INTO t SELECT i, i * i FROM generate_series(21, 30) i;
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SELECT sum(a), sum(b) FROM t;
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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-- vacuum full should merge stripes together
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VACUUM FULL t;
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SELECT sum(a), sum(b) FROM t;
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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-- test the case when all data cannot fit into a single stripe
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SET cstore.stripe_row_count TO 1000;
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INSERT INTO t SELECT i, 2 * i FROM generate_series(1,2500) i;
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SELECT sum(a), sum(b) FROM t;
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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VACUUM FULL t;
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SELECT sum(a), sum(b) FROM t;
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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-- VACUUM FULL doesn't reclaim dropped columns, but converts them to NULLs
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ALTER TABLE t DROP COLUMN a;
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SELECT stripe, attr, block, minimum_value IS NULL, maximum_value IS NULL FROM cstore.cstore_skipnodes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t' ORDER BY 1, 2, 3;
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VACUUM FULL t;
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SELECT stripe, attr, block, minimum_value IS NULL, maximum_value IS NULL FROM cstore.cstore_skipnodes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t' ORDER BY 1, 2, 3;
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-- Make sure we cleaned-up the transient table metadata after VACUUM FULL commands
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SELECT count(*) - :columnar_table_count FROM cstore.cstore_data_files;
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-- do this in a transaction so concurrent autovacuum doesn't interfere with results
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BEGIN;
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SAVEPOINT s1;
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SELECT count(*) FROM t;
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SELECT pg_size_pretty(pg_relation_size('t'));
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INSERT INTO t SELECT i FROM generate_series(1, 10000) i;
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SELECT pg_size_pretty(pg_relation_size('t'));
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SELECT count(*) FROM t;
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ROLLBACK TO SAVEPOINT s1;
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-- not truncated by VACUUM or autovacuum yet (being in transaction ensures this),
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-- so relation size should be same as before.
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SELECT pg_size_pretty(pg_relation_size('t'));
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COMMIT;
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-- vacuum should truncate the relation to the usable space
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VACUUM t;
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SELECT pg_size_pretty(pg_relation_size('t'));
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SELECT count(*) FROM t;
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DROP TABLE t;
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-- Make sure we cleaned the metadata for t too
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SELECT count(*) - :columnar_table_count FROM cstore.cstore_data_files;
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