查询查询缓存命中率的脚本:"Buffer cache hit ratio"

SELECT 
CAST(CAST((a.cntr_value * 1.0 / b.cntr_value)*100 as int) AS VARCHAR(20)) as BufferCacheHitRatio
FROM (
        SELECT * FROM sys.dm_os_performance_counters
        WHERE counter_name = 'Buffer cache hit ratio'
        AND object_name = CASE WHEN @@SERVICENAME = 'MSSQLSERVER'
        THEN 'SQLServer:Buffer Manager'
        ELSE 'MSSQL$' + rtrim(@@SERVICENAME) +
        ':Buffer Manager' END 
    ) a
CROSS JOIN
(
    SELECT * from sys.dm_os_performance_counters
    WHERE counter_name = 'Buffer cache hit ratio base'
    and object_name = CASE WHEN @@SERVICENAME = 'MSSQLSERVER'
    THEN 'SQLServer:Buffer Manager'
    ELSE 'MSSQL$' + rtrim(@@SERVICENAME) +
    ':Buffer Manager' END 
) b  

https://www.cnblogs.com/wy123/p/5272675.html