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https://github.com/ClickHouse/ClickHouse.git
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76 lines
3.1 KiB
SQL
76 lines
3.1 KiB
SQL
DROP TABLE IF EXISTS recompression_table;
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CREATE TABLE recompression_table
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(
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dt DateTime,
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key UInt64,
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value String
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) ENGINE MergeTree()
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ORDER BY tuple()
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PARTITION BY key
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TTL dt + INTERVAL 1 MONTH RECOMPRESS CODEC(ZSTD(17)), dt + INTERVAL 1 YEAR RECOMPRESS CODEC(LZ4HC(10))
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SETTINGS min_rows_for_wide_part = 0, min_bytes_for_wide_part = 0;
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SHOW CREATE TABLE recompression_table;
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SYSTEM STOP TTL MERGES recompression_table;
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INSERT INTO recompression_table SELECT now(), 1, toString(number) from numbers(1000);
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INSERT INTO recompression_table SELECT now() - INTERVAL 2 MONTH, 2, toString(number) from numbers(1000, 1000);
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INSERT INTO recompression_table SELECT now() - INTERVAL 2 YEAR, 3, toString(number) from numbers(2000, 1000);
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SELECT COUNT() FROM recompression_table;
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SELECT name, default_compression_codec FROM system.parts WHERE table = 'recompression_table' and active = 1 and database = currentDatabase() ORDER BY name;
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OPTIMIZE TABLE recompression_table FINAL;
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SELECT name, default_compression_codec FROM system.parts WHERE table = 'recompression_table' and active = 1 and database = currentDatabase() ORDER BY name;
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ALTER TABLE recompression_table MODIFY TTL dt + INTERVAL 1 DAY RECOMPRESS CODEC(ZSTD(12)) SETTINGS mutations_sync = 2;
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SHOW CREATE TABLE recompression_table;
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SELECT name, default_compression_codec FROM system.parts WHERE table = 'recompression_table' and active = 1 and database = currentDatabase() ORDER BY name;
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SYSTEM START TTL MERGES recompression_table;
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OPTIMIZE TABLE recompression_table FINAL;
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SELECT name, default_compression_codec FROM system.parts WHERE table = 'recompression_table' and active = 1 and database = currentDatabase() ORDER BY name;
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SELECT name, recompression_ttl_info.expression FROM system.parts WHERE table = 'recompression_table' and active = 1 and database = currentDatabase() ORDER BY name;
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DROP TABLE IF EXISTS recompression_table;
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CREATE TABLE recompression_table_compact
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(
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dt DateTime,
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key UInt64,
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value String
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) ENGINE MergeTree()
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ORDER BY tuple()
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PARTITION BY key
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TTL dt + INTERVAL 1 MONTH RECOMPRESS CODEC(ZSTD(17)), dt + INTERVAL 1 YEAR RECOMPRESS CODEC(LZ4HC(10))
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SETTINGS min_rows_for_wide_part = 10000;
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SYSTEM STOP TTL MERGES recompression_table_compact;
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INSERT INTO recompression_table_compact SELECT now(), 1, toString(number) from numbers(1000);
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INSERT INTO recompression_table_compact SELECT now() - INTERVAL 2 MONTH, 2, toString(number) from numbers(1000, 1000);
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INSERT INTO recompression_table_compact SELECT now() - INTERVAL 2 YEAR, 3, toString(number) from numbers(2000, 1000);
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SELECT name, default_compression_codec FROM system.parts WHERE table = 'recompression_table_compact' and active = 1 and database = currentDatabase() ORDER BY name;
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ALTER TABLE recompression_table_compact MODIFY TTL dt + INTERVAL 1 MONTH RECOMPRESS CODEC(ZSTD(12)) SETTINGS mutations_sync = 2; -- mutation affect all columns, so codec changes
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SELECT name, default_compression_codec FROM system.parts WHERE table = 'recompression_table_compact' and active = 1 and database = currentDatabase() ORDER BY name;
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DROP TABLE recompression_table_compact;
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