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https://github.com/timescale/timescaledb.git
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00b69ac010
This change is a performance improvement. Previously each insert called a plpgsql function to check if there is a need to close the chunk. This patch implements a c-only fastpath for the case when the table size is less than the configured chunk size.
73 lines
2.5 KiB
PL/PgSQL
73 lines
2.5 KiB
PL/PgSQL
--get the chunk for a given partition and time.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.get_chunk(
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partition_id INT,
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time_point BIGINT
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)
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RETURNS _timescaledb_catalog.chunk LANGUAGE SQL STABLE AS
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$BODY$
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SELECT *
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FROM _timescaledb_catalog.chunk c
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WHERE c.partition_id = get_chunk.partition_id AND
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(c.start_time <= time_point OR c.start_time IS NULL) AND
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(c.end_time >= time_point OR c.end_time IS NULL);
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$BODY$;
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--get the chunk for a given partition and time. The function takes a (shared) row lock
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--on the chunk and might therefore block.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.get_chunk_locked(
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partition_id INT,
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time_point BIGINT
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)
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RETURNS _timescaledb_catalog.chunk LANGUAGE SQL VOLATILE AS
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$BODY$
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SELECT *
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FROM _timescaledb_catalog.chunk c
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WHERE c.partition_id = get_chunk_locked.partition_id AND
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(c.start_time <= time_point OR c.start_time IS NULL) AND
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(c.end_time >= time_point OR c.end_time IS NULL)
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FOR SHARE;
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$BODY$;
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CREATE OR REPLACE FUNCTION _timescaledb_catalog.local_chunk_size(name, name) RETURNS bigint
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AS '$libdir/timescaledb', 'local_chunk_size' LANGUAGE C IMMUTABLE STRICT;
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--returns the current size of a chunk (in bytes) given its ID.
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--The size is typically aligned with the page size in Postgres.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.get_local_chunk_size(
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chunk_id INT
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)
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RETURNS BIGINT LANGUAGE PLPGSQL STABLE AS
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$BODY$
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DECLARE
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chunk_replica_row _timescaledb_catalog.chunk_replica_node;
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BEGIN
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SELECT *
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INTO STRICT chunk_replica_row
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FROM _timescaledb_catalog.chunk_replica_node crn
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WHERE crn.chunk_id = get_local_chunk_size.chunk_id
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AND crn.database_name = current_database();
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IF chunk_replica_row.database_name != current_database() THEN
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RAISE EXCEPTION 'get_local_chunk_size should only be called locally'
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USING ERRCODE = 'IO501';
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END IF;
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RETURN _timescaledb_catalog.local_chunk_size(chunk_replica_row.schema_name, chunk_replica_row.table_name);
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END
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$BODY$;
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--returns the max size (in bytes) that a chunk is allowed to grow to.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.get_chunk_max_size(
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chunk_id INT
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)
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RETURNS BIGINT LANGUAGE SQL STABLE AS
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$BODY$
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SELECT h.chunk_size_bytes
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FROM _timescaledb_catalog.chunk_replica_node crn
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INNER JOIN _timescaledb_catalog.partition_replica pr ON (pr.id = crn.partition_replica_id)
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INNER JOIN _timescaledb_catalog.hypertable h ON (h.id = pr.hypertable_id)
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WHERE (crn.chunk_id = get_chunk_max_size.chunk_id);
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$BODY$;
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