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Now you can notice that after the rst eight initial VLFs are used (the ones with a CreateLSN value of 0), the VLFs alternate between the physical les. Because of the amount of log growth each time, several new VLFs are created, rst from FileID 2 and then from FileID 3. The last VLF added to FileID 3 has not been used yet. So there is really no reason to use multiple physical log les if you have done thorough testing and have determined the optimal size of your database s transaction log. However, if you nd that the log needs to grow more than expected and if the volume containing the log does not have suf cient free space to allow the log to grow enough, you might need to create a second log le on another volume.
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SQL Server assumes you re not maintaining a sequence of log backups if any of the following is true:
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You have con gured the database to truncate the log on a regular basis by setting the recovery model to SIMPLE. You have never taken a full database backup.
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Under any of these circumstances, SQL Server truncates the database s transaction log every time it gets full enough. (I ll explain this in a moment.) The database is considered to be in autotruncate mode. Remember that truncation means that all log records prior to the oldest active transaction are invalidated and all VLFs not containing any part of the active log are marked as reusable. It does not imply shrinking of the physical log le. In addition, if your database is a publisher in a replication scenario, the oldest open transaction could be a transaction marked for replication that has not yet been replicated. Full enough means that there are more log records than can be redone during system startup in a reasonable amount of time the recovery interval. You can change the recovery interval manually by using the sp_con gure stored procedure or by using SQL Server Management Studio, as discussed in 1. However, it is best to let SQL Server autotune this value. In most cases, this recovery interval value is set to one minute. By default, sp_con gure shows zero minutes, meaning SQL Server autotunes the value. SQL Server bases its recovery interval on the estimate that 10 MB worth of transactions can be recovered in one minute.
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The actual log truncation is invoked by the checkpoint process, which is usually sleeping and is awakened only on demand. Each time a user thread calls the log manager, the log manager checks the size of the log. If the size exceeds the amount of work that can be recovered during the recovery interval, the checkpoint thread is woken up. The checkpoint thread checkpoints the database and then truncates the inactive portion of the log. In addition, if the log ever gets to 70 percent full while the database is in autotruncate mode, the log manager wakes the checkpoint thread to force a checkpoint. Growing the log is much more expensive than truncating it, so SQL Server truncates the log whenever it can.
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Note If the log manager is never needed, the checkpoint process won t be invoked and the
truncation never happens. If you have a database in autotruncate mode, for which the transaction log has VLFs with a status of 2, you do not see the status change to 0 until some logging activity is required in the database.
If the log is regularly truncated, SQL Server can reuse space in the physical le by cycling back to an earlier VLF when it reaches the end of the physical log le. In effect, SQL Server recycles the space in the log le that is no longer needed for recovery or backup purposes. My AdventureWorks2008 database is in this state because I have never made a full database backup.
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