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Andres Freund 2589434ae0 pg_buffercache: Add pg_buffercache_summary() 
Using pg_buffercache_summary() is significantly cheaper than querying
pg_buffercache and summarizing in SQL.

Author: Melih Mutlu <m.melihmutlu@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: Zhang Mingli <zmlpostgres@gmail.com>
Discussion: https://postgr.es/m/CAGPVpCQAXYo54Q%3D8gqBsS%3Du0uk9qhnnq4%2B710BtUhUisX1XGEg%40mail.gmail.com
 		2022-10-13 09:55:46 -07:00
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pg_buffercache.sql pg_buffercache: Add pg_buffercache_summary() 2022-10-13 09:55:46 -07:00