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9c6433e6ed
Make truncating a uncompressed chunk drop the data for the case where they reside in a corresponding compressed chunk. Generate invalidations for Continuous Aggregates after TRUNCATE, so as to have consistent refresh operations on the materialization hypertable. Fixes #4362
70 lines
3.4 KiB
SQL
70 lines
3.4 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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--------------------------------------------------------------------------
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-- show_chunks and drop_chunks functions on a compressed table
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-- (issue https://github.com/timescale/timescaledb/issues/1535)
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-- create a table that will not be compressed
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CREATE TABLE public.uncompressed_table(time date NOT NULL, temp float8, device_id text);
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CREATE INDEX ON public.uncompressed_table(time DESC);
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SELECT create_hypertable('public.uncompressed_table', 'time', chunk_time_interval => interval '1 day');
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INSERT INTO public.uncompressed_table VALUES('2020-03-01', 1.0, 'dev1');
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INSERT INTO public.uncompressed_table VALUES('2020-03-05', 2.0, 'dev1');
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INSERT INTO public.uncompressed_table VALUES('2020-03-07', 3.0, 'dev1');
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INSERT INTO public.uncompressed_table VALUES('2020-03-08', 4.0, 'dev7');
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INSERT INTO public.uncompressed_table VALUES('2020-03-09', 5.0, 'dev7');
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INSERT INTO public.uncompressed_table VALUES('2020-03-10', 6.0, 'dev7');
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-- create next table that is going to be compressed:
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CREATE TABLE public.table_to_compress (time date NOT NULL, acq_id bigint, value bigint);
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CREATE INDEX idx_table_to_compress_acq_id ON public.table_to_compress(acq_id);
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SELECT create_hypertable('public.table_to_compress', 'time', chunk_time_interval => interval '1 day');
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ALTER TABLE public.table_to_compress SET (timescaledb.compress, timescaledb.compress_segmentby = 'acq_id');
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INSERT INTO public.table_to_compress VALUES ('2020-01-01', 1234567, 777888);
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INSERT INTO public.table_to_compress VALUES ('2020-02-01', 567567, 890890);
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INSERT INTO public.table_to_compress VALUES ('2020-02-10', 1234, 5678);
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SELECT show_chunks('public.uncompressed_table');
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SELECT show_chunks('public.table_to_compress');
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SELECT show_chunks('public.table_to_compress', older_than=>'1 day'::interval);
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SELECT show_chunks('public.table_to_compress', newer_than=>'1 day'::interval);
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-- compress all chunks of the table:
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SELECT compress_chunk(show_chunks('public.table_to_compress'));
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-- and run the queries again to make sure results are the same
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SELECT show_chunks('public.uncompressed_table');
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SELECT show_chunks('public.table_to_compress');
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SELECT show_chunks('public.table_to_compress', older_than=>'1 day'::interval);
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SELECT show_chunks('public.table_to_compress', newer_than=>'1 day'::interval);
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-- truncate one compressed chunk
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SELECT chunk_schema || '.' || chunk_name as "CHNAME"
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FROM timescaledb_information.chunks
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WHERE hypertable_name = 'table_to_compress' and hypertable_schema = 'public'
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ORDER BY chunk_name LIMIT 1
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\gset
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SELECT count(*) FROM :CHNAME;
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TRUNCATE TABLE :CHNAME;
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SELECT count(*) FROM :CHNAME;
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-- drop all hypertables' old chunks
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SELECT drop_chunks(table_name::regclass, older_than=>'1 day'::interval)
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FROM _timescaledb_catalog.hypertable
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WHERE schema_name = current_schema()
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ORDER BY table_name DESC;
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SELECT show_chunks('public.uncompressed_table');
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SELECT show_chunks('public.table_to_compress');
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-- test calling on internal compressed table
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SELECT
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format('%I.%I', ht.schema_name, ht.table_name) AS "TABLENAME"
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FROM
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_timescaledb_catalog.hypertable ht
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INNER JOIN _timescaledb_catalog.hypertable uncompress ON (ht.id = uncompress.compressed_hypertable_id
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AND uncompress.table_name = 'table_to_compress') \gset
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\set ON_ERROR_STOP 0
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SELECT show_chunks(:'TABLENAME');
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SELECT drop_chunks(:'TABLENAME',now());
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\set ON_ERROR_STOP 1
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