Viewed 29k times. Thank you. Improve this question. Josh Haley Josh Haley 1 1 gold badge 1 1 silver badge 9 9 bronze badges. Add a comment. Active Oldest Votes. To summarize: In order for a log backup to be useful for a restore, there needs to be a database backup along with log backups that cover all the LSNs since the time of that database backup. This will be at least one reason why your log backups aren't functioning now.
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Because the ola hallengren scripts check for log shipping roles and skip log backups if it finds the current db in either msdb. Many thanks to all who took the time to chime in! Sign up or log in Sign up using Google.
Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. 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:. Index build operations use minimial logging but may be delayed when there is a concurrently executing backup.
This delay is caused by the synchronization requirements of minimally logged buffer pool pages when using the simple or bulk-logged recovery model. Manage the Size of the Transaction Log File. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Skip to main content. This browser is no longer supported.
Download Microsoft Edge More info. Contents Exit focus mode. Warning Never delete or move this log unless you fully understand the ramifications of doing so. Tip Known good points from which to begin applying transaction logs during database recovery are created by checkpoints. Note Log truncation does not reduce the size of the physical log file.
Note Under the full recovery model , all bulk operations are fully logged. Note Index build operations use minimial logging but may be delayed when there is a concurrently executing backup. Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community.
It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. When I queried sys. DBCC loginfo returns which is high. The recovery model for this DB is Full and log backups are taken every 30 minutes.
I know log backups are happening as I checked from msdb. I changed it as part of config change. I would like to explore some options to reduce the log file size on the disk. I know it is a bad bad thing to trucate and shrink the log file, but at this point I would like to know my options available. Can someone please suggest a graceful way to do this. Before you shrink the log files it is also important for you to understand how you end up with too many or too less number of VLF's.
I suggest you read the following posts. These will give you a better idea about VLF and transaction log management.
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