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https://github.com/timescale/timescaledb.git
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ea6d826c12
This patch adds 2 new views hypertable_compression_settings and chunk_compression_settings to query the per chunk compression settings.
116 lines
4.3 KiB
SQL
116 lines
4.3 KiB
SQL
-- This file and its contents are licensed under the Timescale License.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-TIMESCALE for a copy of the license.
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\set ECHO ALL
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CREATE VIEW settings AS SELECT * FROM _timescaledb_catalog.compression_settings ORDER BY upper(relid::text) COLLATE "C";
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CREATE VIEW ht_settings AS SELECT * FROM timescaledb_information.hypertable_compression_settings ORDER BY upper(hypertable::text) COLLATE "C";
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CREATE VIEW chunk_settings AS SELECT * FROM timescaledb_information.chunk_compression_settings ORDER BY upper(hypertable::text) COLLATE "C", upper(chunk::text) COLLATE "C";
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CREATE TABLE metrics(time timestamptz not null, device text, value float);
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SELECT table_name FROM create_hypertable('metrics','time');
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ALTER TABLE metrics SET (timescaledb.compress, timescaledb.compress_segmentby='device');
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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SELECT * FROM chunk_settings;
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-- create 2 chunks
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INSERT INTO metrics VALUES ('2000-01-01'), ('2001-01-01');
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-- no change to settings
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SELECT * FROM settings;
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--Enable compression path info
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SET timescaledb.debug_compression_path_info= 'on';
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SELECT compress_chunk('_timescaledb_internal._hyper_1_1_chunk');
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RESET timescaledb.debug_compression_path_info;
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SELECT * FROM settings;
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SELECT * FROM chunk_settings;
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SELECT compress_chunk('_timescaledb_internal._hyper_1_2_chunk');
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SELECT * FROM settings;
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SELECT * FROM chunk_settings;
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-- dropping chunk should remove that chunks compression settings
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DROP TABLE _timescaledb_internal._hyper_1_1_chunk;
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SELECT * FROM settings;
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SELECT * FROM chunk_settings;
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-- decompress_chunk should remove settings for that chunk
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SELECT decompress_chunk('_timescaledb_internal._hyper_1_2_chunk');
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SELECT * FROM settings;
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SELECT * FROM chunk_settings;
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-- compress_chunk should add settings back
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SELECT compress_chunk('_timescaledb_internal._hyper_1_2_chunk');
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SELECT * FROM settings;
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SELECT * FROM chunk_settings;
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-- dropping hypertable should remove all settings
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DROP TABLE metrics;
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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SELECT * FROM chunk_settings;
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CREATE TABLE metrics(time timestamptz not null, d1 text, d2 text, value float);
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SELECT table_name FROM create_hypertable('metrics','time');
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ALTER TABLE metrics SET (timescaledb.compress);
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-- hypertable should have default settings now
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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-- create chunk
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INSERT INTO metrics VALUES ('2000-01-01');
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ALTER TABLE metrics SET (timescaledb.compress_segmentby='d1');
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-- settings should be updated
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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SELECT compress_chunk(show_chunks('metrics'));
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-- settings for compressed chunk should be present
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SELECT * FROM settings;
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SELECT * FROM chunk_settings;
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-- changing settings should update settings for hypertable but not existing compressed chunks
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ALTER TABLE metrics SET (timescaledb.compress_segmentby='d2');
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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SELECT * FROM chunk_settings;
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-- changing settings should update settings for hypertable but not existing compressed chunks
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ALTER TABLE metrics SET (timescaledb.compress_segmentby='');
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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SELECT * FROM chunk_settings;
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-- create another chunk
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INSERT INTO metrics VALUES ('2000-02-01');
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SELECT compress_chunk(show_chunks('metrics'), true);
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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SELECT * FROM chunk_settings;
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ALTER TABLE metrics SET (timescaledb.compress_segmentby='d2');
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SELECT format('%I.%I', schema_name, table_name) AS "CHUNK" FROM _timescaledb_catalog.chunk WHERE compressed_chunk_id IS NOT NULL ORDER BY id LIMIT 1 OFFSET 1\gset
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-- recompressing chunks should apply current hypertable settings
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SELECT compress_chunk(:'CHUNK', recompress:=true);
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SELECT * FROM settings;
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SELECT * FROM ht_settings;
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SELECT * FROM chunk_settings;
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-- test different order by flags with compression settings view
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CREATE TABLE metrics2(time timestamptz not null, d1 text, d2 text, value float);
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SELECT create_hypertable('metrics2','time');
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SELECT * FROM ht_settings;
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ALTER TABLE metrics2 SET (timescaledb.compress_orderby='d1 NULLS FIRST, d2 NULLS LAST, time, value ASC');
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SELECT * FROM ht_settings;
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ALTER TABLE metrics2 SET (timescaledb.compress_orderby='d1 DESC NULLS LAST, d2 ASC NULLS FIRST, value DESC, time ASC NULLS FIRST');
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SELECT * FROM ht_settings;
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