OS Wait Time: Async_Network_IO

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This metric gives you an indication of how much time is spent waiting to send information over a network. Read more

Average I/O stalls

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This is a general indicator of performance problems. High stall times indicate I/O problems, which can be attributed to busy physical disks or queries that return large data sets to the client. Read more

Buffer pressure

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Trying to determine if you have pressure in your buffer allocations can be difficult. Buffer cache hit ratio is an almost useless metric, so you need a mechanism to let you know if there’s a problem in that area. Read more

WriteLog wait time

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During a transaction, data is written to the log cache so that it’s ready to be written to the log file on commit, or can be rolled back if necessary. When the log cache is being flushed to disk, the SQL Server session will wait on the WriteLog wait type. Read more