In the previous post, I loaded table into the buffer cache of PostgreSQL (Using pg_prewarm).

PostgreSQL: Load table into Buffer Cache, Increase the Speed of Accessing data

In this post, I am sharing a script for checking the status of Shared buffer area of PostgreSQL.
Using pg_buffercache, we can check this. I took the script from the this official.

Please check the below script and output:

Create pg_buffercache module:

CREATE EXTENSION pg_buffercache;

Script to check the status of Shared Buffer:

SELECT 
    c.relname, 
    count(*) AS buffers
FROM pg_buffercache b 
INNER JOIN pg_class c
   ON b.relfilenode = pg_relation_filenode(c.oid) 
    	AND b.reldatabase IN (0, (SELECT oid FROM pg_database
WHERE datname = current_database()))
GROUP BY c.relname
ORDER BY 2 DESC;