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https://github.com/timescale/timescaledb.git
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a089843ffd
The `drop_chunks` function is refactored to make table name mandatory for the function. As a result, the function was also refactored to accept the `regclass` type instead of table name plus schema name and the parameters were reordered to match the order for `show_chunks`. The commit also refactor the code to pass the hypertable structure between internal functions rather than the hypertable relid and moving error checks to the PostgreSQL function. This allow the internal functions to avoid some lookups and use the information in the structure directly and also give errors earlier instead of first dropping chunks and then error and roll back the transaction.
46 lines
2.7 KiB
SQL
46 lines
2.7 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE 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.table_to_compress');
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SELECT show_chunks(hypertable=>'public.table_to_compress', older_than=>'1 day'::interval);
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SELECT show_chunks(hypertable=>'public.table_to_compress', newer_than=>'1 day'::interval);
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SELECT show_chunks(); -- across all hypertables
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-- compress all chunks of the table:
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SELECT compress_chunk(show_chunks(hypertable=>'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.table_to_compress');
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SELECT show_chunks(hypertable=>'public.table_to_compress', older_than=>'1 day'::interval);
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SELECT show_chunks(hypertable=>'public.table_to_compress', newer_than=>'1 day'::interval);
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SELECT show_chunks();
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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();
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