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The Number of log flushes.
As users make modifications to SQL Server databases, SQL Server records these changes in a memory structure called the Log Cache. Each SQL Server database has its own log cache.
When a user transaction is committed (either explicitly using a COMMIT statement, or implicitly), SQL Server writes all changes from the Log Cache out to the log files on disk. This process is termed a log flush. The user that issued the commit must wait until the log flush is complete before they can continue. If the log flush takes a long time, this will degrade the user's response time.
Time spent by the various sessions waiting for miscellaneous logs.
Time spent by the various sessions waiting for log space to be freed by log truncation, that is, deleting log records from the transaction log.
Even though log transaction is an automatic process, this process can be delayed as a result of several factors, such as long running transaction, a data backup taking place, or if no checkpoint took place since the last log truncation.
Time spent waiting by the various processes waiting for a log operation to complete.
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