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https://github.com/timescale/timescaledb.git
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201a948452
Add check that time dimensions are set as NOT NULL in the main table that a hypertable is created from. If it is not set, the constraint will be added.
67 lines
4.1 KiB
Plaintext
67 lines
4.1 KiB
Plaintext
CREATE TABLE vacuum_test(time timestamp, temp float);
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-- create hypertable with three chunks
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SELECT create_hypertable('vacuum_test', 'time', chunk_time_interval => 2628000000000);
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NOTICE: Adding NOT NULL constraint to time column time (NULL time values not allowed)
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create_hypertable
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-------------------
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(1 row)
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INSERT INTO vacuum_test VALUES ('2017-01-20T09:00:01', 17.5),
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('2017-01-21T09:00:01', 19.1),
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('2017-04-20T09:00:01', 89.5),
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('2017-04-21T09:00:01', 17.1),
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('2017-06-20T09:00:01', 18.5),
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('2017-06-21T09:00:01', 11.0);
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-- no stats
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SELECT tablename, attname, histogram_bounds, n_distinct FROM pg_stats
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WHERE schemaname = '_timescaledb_internal' AND tablename LIKE '_hyper_%_chunk'
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ORDER BY schemaname, tablename;
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tablename | attname | histogram_bounds | n_distinct
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-----------+---------+------------------+------------
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(0 rows)
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VACUUM (VERBOSE, ANALYZE) vacuum_test;
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INFO: vacuuming "_timescaledb_internal._hyper_1_1_chunk"
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INFO: index "_hyper_1_1_chunk_vacuum_test_time_idx" now contains 2 row versions in 2 pages
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INFO: "_hyper_1_1_chunk": found 0 removable, 2 nonremovable row versions in 1 out of 1 pages
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INFO: analyzing "_timescaledb_internal._hyper_1_1_chunk"
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INFO: "_hyper_1_1_chunk": scanned 1 of 1 pages, containing 2 live rows and 0 dead rows; 2 rows in sample, 2 estimated total rows
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INFO: vacuuming "_timescaledb_internal._hyper_1_2_chunk"
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INFO: index "_hyper_1_2_chunk_vacuum_test_time_idx" now contains 2 row versions in 2 pages
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INFO: "_hyper_1_2_chunk": found 0 removable, 2 nonremovable row versions in 1 out of 1 pages
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INFO: analyzing "_timescaledb_internal._hyper_1_2_chunk"
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INFO: "_hyper_1_2_chunk": scanned 1 of 1 pages, containing 2 live rows and 0 dead rows; 2 rows in sample, 2 estimated total rows
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INFO: vacuuming "_timescaledb_internal._hyper_1_3_chunk"
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INFO: index "_hyper_1_3_chunk_vacuum_test_time_idx" now contains 2 row versions in 2 pages
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INFO: "_hyper_1_3_chunk": found 0 removable, 2 nonremovable row versions in 1 out of 1 pages
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INFO: analyzing "_timescaledb_internal._hyper_1_3_chunk"
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INFO: "_hyper_1_3_chunk": scanned 1 of 1 pages, containing 2 live rows and 0 dead rows; 2 rows in sample, 2 estimated total rows
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-- stats should exist for all three chunks
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SELECT tablename, attname, histogram_bounds, n_distinct FROM pg_stats
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WHERE schemaname = '_timescaledb_internal' AND tablename LIKE '_hyper_%_chunk'
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ORDER BY schemaname, tablename;
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tablename | attname | histogram_bounds | n_distinct
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------------------+---------+---------------------------------------------------------+------------
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_hyper_1_1_chunk | time | {"Fri Jan 20 09:00:01 2017","Sat Jan 21 09:00:01 2017"} | -1
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_hyper_1_1_chunk | temp | {17.5,19.1} | -1
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_hyper_1_2_chunk | time | {"Thu Apr 20 09:00:01 2017","Fri Apr 21 09:00:01 2017"} | -1
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_hyper_1_2_chunk | temp | {17.1,89.5} | -1
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_hyper_1_3_chunk | time | {"Tue Jun 20 09:00:01 2017","Wed Jun 21 09:00:01 2017"} | -1
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_hyper_1_3_chunk | temp | {11,18.5} | -1
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(6 rows)
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-- Run vacuum on a normal (non-hypertable) table
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CREATE TABLE vacuum_norm(time timestamp, temp float);
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INSERT INTO vacuum_norm VALUES ('2017-01-20T09:00:01', 17.5),
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('2017-01-21T09:00:01', 19.1),
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('2017-04-20T09:00:01', 89.5),
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('2017-04-21T09:00:01', 17.1),
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('2017-06-20T09:00:01', 18.5),
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('2017-06-21T09:00:01', 11.0);
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VACUUM (VERBOSE, ANALYZE) vacuum_norm;
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INFO: vacuuming "public.vacuum_norm"
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INFO: "vacuum_norm": found 0 removable, 6 nonremovable row versions in 1 out of 1 pages
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INFO: analyzing "public.vacuum_norm"
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INFO: "vacuum_norm": scanned 1 of 1 pages, containing 6 live rows and 0 dead rows; 6 rows in sample, 6 estimated total rows
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