The principal server instance sends each log record immediately to the mirror server instance, which applies the incoming log records to the mirror database, continually rolling it forward. For more information, see Database Mirroring. The transaction log is implemented as a separate file or set of files in the database. The log cache is managed separately from the buffer cache for data pages, which results in simple, fast, and robust code within the SQL Server Database Engine.
For more information, see Transaction Log Physical Architecture. The transaction log can be implemented in several files. This reduces the potential of running out of space in the transaction log, while at the same time reducing administrative overhead. The mechanism to reuse the space within the log files is quick and has minimal effect on transaction throughput.
Log truncation frees space in the log file for reuse by the transaction log. You must regularly truncate your transaction log to keep it from filling the allotted space. Several factors can delay log truncation, so monitoring log size matters. Some operations can be minimally logged to reduce their impact on transaction log size.
Log truncation deletes inactive virtual log files VLFs from the logical transaction log of a SQL Server database, freeing space in the logical log for reuse by the Physical transaction log. If a transaction log is never truncated, it will eventually fill all the disk space allocated to physical log files.
To avoid running out of space, unless log truncation is delayed for some reason, truncation occurs automatically after the following events:. For more information, see Factors that can delay log truncation , later in this topic. Log truncation does not reduce the size of the physical log file.
To reduce the physical size of a physical log file, you must shrink the log file. For information about shrinking the size of the physical log file, see Manage the Size of the Transaction Log File. However, keep in mind Factors that can delay log truncation. If the storage space is required again after a log shrink, the transaction log will grow again and by doing that, introduce performance overhead during log grow operations.
When log records remain active for a long time, transaction log truncation is delayed, and the transaction log can fill up, as we mentioned earlier in this long topic.
Really, Log truncation can be delayed by a variety of reasons. The following table describes the values of these columns.
Minimal logging involves logging only the information that is required to recover the transaction without supporting point-in-time recovery. This topic identifies the operations that are minimally logged under the bulk-logged recovery model as well as under the simple recovery model, except when a backup is running. Under the full recovery model , all bulk operations are fully logged. However, you can minimize logging for a set of bulk operations by switching the database to the bulk-logged recovery model temporarily for bulk operations.
Minimal logging is more efficient than full logging, and it reduces the possibility of a large-scale bulk operation filling the available transaction log space during a bulk transaction.
However, if the database is damaged or lost when minimal logging is in effect, you cannot recover the database to the point of failure. The following operations, which are fully logged under the full recovery model, are minimally logged under the simple and bulk-logged recovery model:.
Partial updates to large value data types, using the. Note that minimal logging is not used when existing values are updated. If the database is set to the simple or bulk-logged recovery model, some index DDL operations are minimally logged whether the operation is executed offline or online. The minimally logged index operations are as follows:.
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Add a comment. Active Oldest Votes. This is a read-only status variable. It tells you why the log cannot be truncated at this point. Improve this answer. David W. SQL Server r2 I needed to modify it slightly.
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Visit site. If that agent cannot keep up with the load, log truncation cannot occur. I forced removal of the replication must have been caused during a restore at some point. FROM sys. The column displays the reason of transaction log space is currently waiting on to clear. Possible reasons include: Log backup needs to be run or if you could lose a day's worth of data, throw this little fella in simple recovery mode. Some more detail: Server A has replication enabled. This rep is run occasionally.
Database A. Server B is new and doesn't have replication enabled yet. Unable to shrink log file due to transactional replication trend dba. It's a non-prod system so I've taken it offline and back online, jiggled with the recovery model, and still, no change. After that, I was able to shrink the log file. Here is one of my earlier posts which has a script to shrink the log file of all databases. As that is usually a quick process you should not see this wait for a long time. Size of Transaction Log Increasing and cannot be truncated In my case it showed "Replication" for my database, then I began below troubleshooting.
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