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https://github.com/timescale/timescaledb.git
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6a9db8a621
A new function, `get_chunk_relstats()`, allows fetching relstats
(basically `pg_class.{relpages,reltuples`) from remote chunks on data
nodes and writing it to the `pg_class` entry for the corresponding
local chunk. The function expects either a chunk or a hypertable as
input and returns the relstats for the given chunk or all chunks for
the given hypertable, respectively.
Importing relstats as described is useful as part of a distributed
ANALYZE/VACUUM that won't require fetching all data into the access
node for local sampling (like the current implemention does).
In a future change, this function will be called as part of a local
ANALYZE on the access node that runs ANALYZE on all data nodes
followed by importing of the resulting relstats for the analyzed
chunks.
119 lines
5.1 KiB
SQL
119 lines
5.1 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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GRANT CREATE ON DATABASE :TEST_DBNAME TO :ROLE_DEFAULT_PERM_USER;
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SET ROLE :ROLE_DEFAULT_PERM_USER;
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CREATE SCHEMA "ChunkSchema";
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CREATE TABLE chunkapi (time timestamptz, device int, temp float);
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SELECT * FROM create_hypertable('chunkapi', 'time', 'device', 2);
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INSERT INTO chunkapi VALUES ('2018-01-01 05:00:00-8', 1, 23.4);
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SELECT (_timescaledb_internal.show_chunk(show_chunks)).*
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FROM show_chunks('chunkapi');
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-- Creating a chunk with the constraints of an existing chunk should
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-- return the existing chunk
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1514419200000000, 1515024000000000], "device": [-9223372036854775808, 1073741823]}');
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\set VERBOSITY default
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\set ON_ERROR_STOP 0
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-- Modified time constraint should fail with collision
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1514419600000000, 1515024000000000], "device": [-9223372036854775808, 1073741823]}');
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-- Missing dimension
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1514419600000000, 1515024000000000]}');
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-- Extra dimension
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1514419600000000, 1515024000000000], "device": [-9223372036854775808, 1073741823], "time2": [1514419600000000, 1515024000000000]}');
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-- Bad dimension name
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1514419600000000, 1515024000000000], "dev": [-9223372036854775808, 1073741823]}');
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-- Same dimension twice
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1514419600000000, 1515024000000000], "time": [1514419600000000, 1515024000000000]}');
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-- Bad bounds format
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": ["1514419200000000", 1515024000000000], "device": [-9223372036854775808, 1073741823]}');
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-- Bad slices format
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1515024000000000], "device": [-9223372036854775808, 1073741823]}');
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-- Bad slices json
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time: [1515024000000000] "device": [-9223372036854775808, 1073741823]}');
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-- Valid chunk, but no permissions
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SET ROLE :ROLE_DEFAULT_PERM_USER_2;
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1515024000000000, 1519024000000000], "device": [-9223372036854775808, 1073741823]}', 'ChunkSchema', 'My_chunk_Table_name');
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SET ROLE :ROLE_DEFAULT_PERM_USER;
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\set ON_ERROR_STOP 1
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\set VERBOSITY terse
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-- Create a chunk that does not collide and with custom schema and name
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SELECT * FROM _timescaledb_internal.create_chunk('chunkapi',' {"time": [1515024000000000, 1519024000000000], "device": [-9223372036854775808, 1073741823]}', 'ChunkSchema', 'My_chunk_Table_name');
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SELECT (_timescaledb_internal.show_chunk(show_chunks)).*
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FROM show_chunks('chunkapi');
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-- Show the new chunks
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\dt public.*
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\dt "ChunkSchema".*
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-- Test getting relation stats for chunk. First get stats
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-- chunk-by-chunk. Note that the table isn't ANALYZED, so no stats
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-- present yet.
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SELECT (_timescaledb_internal.get_chunk_relstats(show_chunks)).*
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FROM show_chunks('chunkapi');
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-- Get the same stats but by giving the hypertable as input
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SELECT * FROM _timescaledb_internal.get_chunk_relstats('chunkapi');
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-- Show stats after analyze
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ANALYZE chunkapi;
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SELECT * FROM _timescaledb_internal.get_chunk_relstats('chunkapi');
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-- Test getting chunk stats on a distribute hypertable
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SET ROLE :ROLE_CLUSTER_SUPERUSER;
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SET client_min_messages TO ERROR;
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DROP DATABASE IF EXISTS data_node_1;
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DROP DATABASE IF EXISTS data_node_2;
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SET client_min_messages TO NOTICE;
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SELECT * FROM add_data_node('data_node_1', host => 'localhost',
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database => 'data_node_1');
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SELECT * FROM add_data_node('data_node_2', host => 'localhost',
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database => 'data_node_2');
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GRANT USAGE
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ON FOREIGN SERVER data_node_1, data_node_2
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TO :ROLE_1;
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SET ROLE :ROLE_1;
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CREATE TABLE disttable (time timestamptz, device int, temp float);
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SELECT * FROM create_distributed_hypertable('disttable', 'time', 'device');
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INSERT INTO disttable VALUES ('2018-01-01 05:00:00-8', 1, 23.4),
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('2018-01-01 06:00:00-8', 4, 22.3),
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('2018-01-01 06:00:00-8', 1, 21.1);
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-- No stats on the local table
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SELECT * FROM _timescaledb_internal.get_chunk_relstats('disttable');
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-- Run ANALYZE on data node 1
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SELECT * FROM distributed_exec('ANALYZE disttable', '{ "data_node_1" }');
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-- Stats should now be refreshed locally
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SELECT * FROM _timescaledb_internal.get_chunk_relstats('disttable');
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-- Run ANALYZE again, but on both nodes
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SELECT * FROM distributed_exec('ANALYZE disttable');
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-- Now expect stats from all data node chunks
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SELECT * FROM _timescaledb_internal.get_chunk_relstats('disttable');
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RESET ROLE;
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-- Clean up
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TRUNCATE disttable;
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SELECT * FROM delete_data_node('data_node_1', force => true);
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SELECT * FROM delete_data_node('data_node_2', force => true);
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DROP DATABASE data_node_1;
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DROP DATABASE data_node_2;
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