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df4f3ab517
Allow users to opt out of returning FPI data and block data from
pg_get_wal_block_info as an optimization. Testing has shown that this
can make function execution over twice as fast in some cases.
When pg_get_wal_block_info is called with "show_data := false", it
always returns NULL values for its block_data and block_fpi_data bytea
output parameters. Nothing else changes. In particular, the function
will still return the usual per-block summary of block data/FPI space
overhead. Use of "show_data := false" is therefore feasible with all
queries that don't specifically require these raw binary strings.
Follow-up to recent work in commit 122376f0. There still hasn't been a
stable release with the pg_get_wal_block_info function, so no bump in
the pg_walinspect extension version.
Per suggestion from Melanie Plageman.
Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAAKRu_bJvbcYBRj2cN6G2xV7B7-Ja+pjTO1nEnEhRR8OXYiABA@mail.gmail.com
Discussion: https://postgr.es/m/CAH2-Wzm9shOkEDM10_+qOZkRSQhKVxwBFiehH6EHWQQRd_rDPw@mail.gmail.com
43 lines
1.3 KiB
SQL
43 lines
1.3 KiB
SQL
/* contrib/pg_walinspect/pg_walinspect--1.0--1.1.sql */
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-- complain if script is sourced in psql, rather than via ALTER EXTENSION
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\echo Use "ALTER EXTENSION pg_walinspect UPDATE TO '1.1'" to load this file. \quit
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-- Unsupported functions after 1.1.
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DROP FUNCTION pg_get_wal_records_info_till_end_of_wal(pg_lsn);
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DROP FUNCTION pg_get_wal_stats_till_end_of_wal(pg_lsn, boolean);
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--
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-- pg_get_wal_block_info()
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--
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CREATE FUNCTION pg_get_wal_block_info(IN start_lsn pg_lsn,
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IN end_lsn pg_lsn,
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IN show_data boolean DEFAULT true,
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OUT start_lsn pg_lsn,
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OUT end_lsn pg_lsn,
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OUT prev_lsn pg_lsn,
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OUT block_id int2,
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OUT reltablespace oid,
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OUT reldatabase oid,
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OUT relfilenode oid,
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OUT relforknumber int2,
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OUT relblocknumber int8,
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OUT xid xid,
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OUT resource_manager text,
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OUT record_type text,
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OUT record_length int4,
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OUT main_data_length int4,
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OUT block_data_length int4,
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OUT block_fpi_length int4,
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OUT block_fpi_info text[],
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OUT description text,
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OUT block_data bytea,
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OUT block_fpi_data bytea
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)
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RETURNS SETOF record
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AS 'MODULE_PATHNAME', 'pg_get_wal_block_info'
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LANGUAGE C STRICT PARALLEL SAFE;
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REVOKE EXECUTE ON FUNCTION pg_get_wal_block_info(pg_lsn, pg_lsn, boolean) FROM PUBLIC;
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GRANT EXECUTE ON FUNCTION pg_get_wal_block_info(pg_lsn, pg_lsn, boolean) TO pg_read_server_files;
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