Many years ago, when I first started working with SQL Server, there were a number of performance counters that were on the radar of all conscientious DBAs, and were used to track SQL Server performance and assess the general health of a server. One of those counters was SQLServer:Buffer Manager\Buffer Cache Hit Ratio, described as follows in the Books Online topic for the SQL Server:Buffer Manager Object'...
Great SQL Server Debates: Buffer Cache Hit Ratio
'One of the more popular counters used by DBAs to monitor the performance, the Buffer Cache Hit Ratio, is useless as a predictor of imminent performance problems. Worse, it can be misleading. Jonathan Kehayias demonstrates this convincingly with some simple tests.
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