I got this query from a blog post:
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 post said that it would give me a percentage of hits to the cache. It seemed to indicate that it would be a value of 0-100 (it showed a result of 87).
But when I run it I am getting very high numbers. Here is an example:
object_name counter_name cntr_value SQLServer:Buffer Manager Buffer cache hit ratio 9990
Does this mean 99.90 %?
If not, what does it mean? And how can I get the real value?
NOTE: I have gotten values as low as 257 and as high as 352363
Incase it is relevant, here are a few other server stats:
- Page life expectancy: 145
- Page reads/sec: 1,380,009,009