Buffer Cache Hit Ratio

Buffer Cache Hit Ratio shows how SQL Server utilizes buffer cache
“Percent of page requests satisfied by data pages from the buffer pool”

SELECT object_name, counter_name, cntr_value
FROM sys.dm_os_performance_counters
WHERE [object_name] LIKE '%Buffer Manager%'
AND [counter_name] = 'Buffer cache hit ratio'

The recommended value for Buffer Cache Hit Ratio is over 90. A lower value indicates a memory problem.

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