Microsoft sql 2005 recovery model

Bulk log does not retain tlog history for certain bulk data modifications, like a reindex and other cases. It does keep the full history for all non-bulk activity.

Bulk logged, like full recovery, keeps anything that is written to the log until it is backed up. It does not discard any log history. The difference from full is that, for some operations see operations that can be minimally logged in Books Online only the page allocations are logged and not the actual row inserts as would happen in full recovery.

I appreciate the clarity and had a funny feeling that I was missing something when I clicked post. Next time, I'll double check first.

In simple because the log is truncated marked as reusable every time a checkpoint occurs allowing log records to be overwritten.

In bulk logged you can restore to point in time unless there was a minimally logged operation during the period covered by that log backup. If there is, you can only restore to the time the log backup was taken, not any random point in that interval. And to regain point in time recovery once again, you could perform another log backup.

Point in time recovery will be available again, after the next log backup following a minimally logged activity. If you do not back up the log frequently enough, the transaction log can expand until it runs out of disk space! Ensure periodic database backups are scheduled. Backing up your database is essential both to protect your data and to truncate the inactive portion of the transaction log.

Create a Job. Disable or Enable a Job. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? For other possible causes of a transaction log that continues to grow unexpectedly please see the following:. When you first create a database using the FULL recovery model, the transaction log will be reused as needed similar to a SIMPLE recovery database , up until the time you create a full database backup.

The log can be safely reused in this situation because media recovery of the log is not possible without a log backup and a log backup cannot be completed until a full database backup is completed first. Once a full database backup has been completed, all log records that have not been backed up must remain in the log to preserve the log chain for possible media recovery until the log is backed up.

One method you can use to see if you have a recent log backup for your database is to use the following T-SQL query. The query should only return 1 row and is designed to give you the type for the latest backup of your database.

Any other type means you likely need to complete a log backup to avoid any log growth. Need more help? If you cannot install this hotfix, you can perform the following workarounds to mitigate an existing issue and to prevent a future occurrence. Wait for the restore or recovery operation to complete If you have a non-recovered database that is experiencing the slow performance when you restore or recovery the database, you may have to wait for the restore or recovery operation to be completed.

Stopping SQL Server usually offers no relief for a slow recovery and may take more time to repeat the same recovery analysis phase, redo phase, or undo phase. Avoid restoring the transaction log sequence that contains thousands of VLFs If you experience the slow performance while you restore and recover a database by using a backup file, you can avoid restoring the transaction log sequences that contain thousands of VLFs.

If you do not fully restore the log sequences up to the latest point in time during a failure recovery scenario, data loss occurs in your database SQL Server. This data loss occurs because not all transactions are being kept. Therefore, there is a business tradeoff decision. You can fully restore a highly fragmented transaction log. However, this operation may take many hours. Or, you can use the STOP AT statement in the recovery to stop the recovery before the highly fragmented part of the log.

However, any missing transactions that you omit are lost. Note Without installing this hotfix, there is typically no safe recourse for expedited recovery after you restart SQL Server.

SQL Server has to locate the list of VLFs to analyze the log files, to redo completed transactions, and then to undo incomplete transactions to finish recovery to bring the database online safely. You cannot safely skip transactions during recovery. Set the autogrow increment of the database to an appropriate size If the size of the autogrow increment is too small, there will be many Virtual Log Files VLFs , and you may experience slow performance in SQL Server. If the size of the autogrow increment is too large, queries that make the transaction logs grow automatically may have to wait for a long time to finish a growth.

Therefore, a time-out error may occur in SQL Server. To work around these issues, you can set the size of the autogrow increment for your database to an appropriate size. Eliminate the large number of VLFs, and use a manual growth If many VLFs are in the transaction log, reduce the size of the transaction log, and make it increase before peak business to meet the demand by using a manual growth. For example, the transaction log increases back to a reasonable average size in a large increment or in a single manual growth.

Therefore, the size of the transaction log reaches a peak capacity, and the log backup files are scheduled on a frequent and periodic basis. Additionally, the transaction log might be truncated, and the VLFs for the transaction log can be reused in a cycle. How to shrink and increase the transaction log manually To correct a log that has too many VLFs, follow these steps to shrink the log and increase it again manually:.