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45 lines
1.2 KiB
SQL
45 lines
1.2 KiB
SQL
--
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-- Author: Hari Sekhon
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-- Date: 2020-08-05 16:22:42 +0100 (Wed, 05 Aug 2020)
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--
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-- vim:ts=2:sts=2:sw=2:et:filetype=sql
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--
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-- https://github.com/harisekhon/bash-tools
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--
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-- License: see accompanying Hari Sekhon LICENSE file
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--
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-- If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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--
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-- https://www.linkedin.com/in/harisekhon
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--
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-- PostgreSQL query times from pg_stat_statement
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-- postgresql.conf needs before start:
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-- shared_preload_libraries = 'pg_stat_statements'
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--
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CREATE extension pg_stat_statements;
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SELECT
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calls,
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rows,
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shared_blks_hit,
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shared_blks_read,
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-- using greatest() to avoid divide by zero error, by ensuring we divide by at least 1
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shared_blks_hit /
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GREATEST((shared_blks_hit + shared_blks_read), 1)::float AS shared_blks_hit_ratio,
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-- casting divisor to float to avoid getting integer maths returning zeros instead of fractional ratios
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local_blks_hit,
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local_blks_read,
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local_blks_hit /
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GREATEST((local_blks_hit + local_blks_read), 1)::float AS local_blks_hit_ratio,
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query
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FROM
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pg_stat_statements
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--ORDER BY rows DESC
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ORDER BY
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shared_blks_hit_ratio DESC,
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local_blks_hit_ratio DESC,
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rows DESC
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LIMIT 100;
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