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30 lines
721 B
SQL
30 lines
721 B
SQL
--
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-- Author: Hari Sekhon
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-- Date: 2020-08-05 15:28:12 +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 Indexes Cache-hit Ratio
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--
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-- should be closer to 1, eg. 0.99
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SELECT
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SUM(idx_blks_read) AS idx_read,
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SUM(idx_blks_hit) AS idx_hit,
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(SUM(idx_blks_hit) - SUM(idx_blks_read)) /
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SUM(idx_blks_hit)
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AS ratio
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FROM
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pg_statio_user_indexes
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ORDER BY
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ratio DESC;
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