added postgres_cache_hit_ratio.sql
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--
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-- Author: Hari Sekhon
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-- Date: 2020-08-05 14:57:37 +0100 (Wed, 05 Aug 2020)
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--
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-- vim:ts=4:sts=4:sw=4:et
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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 Cache-hit ratio (should be closer to 1, eg. 0.99)
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SELECT SUM(heap_blks_read) AS heap_read,
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SUM(heap_blks_hit) AS heap_hit,
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SUM(heap_blks_hit) /
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(SUM(heap_blks_hit) + SUM(heap_blks_read))
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AS ratio
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FROM pg_statio_user_tables;
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