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This patch implements changes to the compressed hypertable to allow per chunk configuration. To enable this the compressed hypertable can no longer be in an inheritance tree as the schema of the compressed chunk is determined by the compression settings. While this patch implements all the underlying infrastructure changes, the restrictions for changing compression settings remain intact and will be lifted in a followup patch.
51 lines
1.8 KiB
SQL
51 lines
1.8 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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\c :TEST_DBNAME :ROLE_SUPERUSER
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-- create compressed hypertable
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CREATE TABLE "public"."metrics" (
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"time" timestamp with time zone NOT NULL,
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"device_id" "text",
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"val" double precision
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);
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SELECT create_hypertable('public.metrics', 'time');
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ALTER TABLE metrics SET (timescaledb.compress, timescaledb.compress_orderby = 'time', timescaledb.compress_segmentby = 'device_id');
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-- insert uncompressed row into hypertable
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INSERT INTO metrics (time, device_id, val)
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VALUES('2023-05-01T00:00:00Z'::timestamptz, 1, 1.0);
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SELECT count(*) FROM _timescaledb_internal._hyper_1_1_chunk;
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-- compress these rows, we do this to get compressed row data for the test
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SELECT compress_chunk('_timescaledb_internal._hyper_1_1_chunk');
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-- create custom compressed chunk table
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CREATE TABLE _timescaledb_internal.custom_compressed_chunk( LIKE _timescaledb_internal.compress_hyper_2_2_chunk);
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-- copy compressed row from compressed table into custom compressed chunk table
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INSERT INTO "_timescaledb_internal"."custom_compressed_chunk" SELECT * FROM "_timescaledb_internal"."compress_hyper_2_2_chunk";
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-- decompress the rows, moving them back to uncompressed space
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SELECT decompress_chunk('"_timescaledb_internal"."_hyper_1_1_chunk"');
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-- attach compressed chunk to parent chunk
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SELECT _timescaledb_functions.create_compressed_chunk(
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'"_timescaledb_internal"."_hyper_1_1_chunk"'::TEXT::REGCLASS,
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'"_timescaledb_internal"."custom_compressed_chunk"'::TEXT::REGCLASS,
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8192,
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8192,
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16384,
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8192,
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8192,
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16384,
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1,
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1
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);
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-- select total rows in chunk (should be 2)
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SELECT count(*) FROM "_timescaledb_internal"."_hyper_1_1_chunk";
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