Asked by: Abdelmounim Rotbi
technology and computing databases

Why is SQL Server log file full?

Last Updated: 24th March, 2020

When the transaction logs are full, you must reduce the size of the transaction logs. To do this, you have to truncate the inactive transactions in your transaction log, and then shrink the transaction log file. When the transaction logs are full, immediately back up your transaction log file.

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Regarding this, why is SQL Server transaction log full?

When the transaction log becomes full, SQL Server Database Engine issues a 9002 error. The log can fill when the database is online, or in recovery. If the log fills while the database is online, the database remains online but can only be read, not updated.

Subsequently, question is, how do I stop SQL Server transaction log full? How to minimize log operations in SQL Server to avoid "log full" error

  1. Backing up the log.
  2. Freeing disk space so that the log can automatically grow.
  3. Moving the log file to a disk drive with sufficient space.
  4. Increasing the size of a log file.
  5. Adding a log file on a different disk.

Beside this, what happens when SQL log file is full?

When the transaction logs are full, you must reduce the size of the transaction logs. To do this, you have to truncate the inactive transactions in your transaction log, and then shrink the transaction log file. When the transaction logs are full, immediately back up your transaction log file.

Why is SQL log file so large?

It is possible that you're just running out of disk space and it is causing your transaction log to error. You might be able to free disk space on the disk drive that contains the transaction log file for the database by deleting or moving other files. The freed disk space will allow for the log file to enlarge.

Related Question Answers

Plautila Preece


How do I truncate a SQL server log file?

To truncate SQL transaction logs launch SQL Server Management Studio (SSMS), select the desired database (with large transaction log), right click on it and select Properties from the context menu. Go to Options and switch the database Recovery model to Simple.

Keisy Gluhman


What is log file in database?

In computing, a log file is a file that records either events that occur in an operating system or other software runs, or messages between different users of a communication software. Logging is the act of keeping a log. In the simplest case, messages are written to a single log file.

Sandu Raza


How do I view SQL transaction logs?

To view logs that are related to general SQL Server activity
  1. Right-click SQL Server Logs, point to View, and then click either SQL Server Log or SQL Server and Windows Log.
  2. Expand SQL Server Logs, right-click any log file, and then click View SQL Server Log. You can also double-click any log file.

Shelton Margolis


Mahmud Bruhnke


What is log file in SQL?

A transaction log is a file – integral part of every SQL Server database. It contains log records produced during the logging process in a SQL Server database. The transaction log is the most important component of a SQL Server database when it comes to the disaster recovery – however, it must be uncorrupted.

Kelley Hilbrans


Can I delete SQL Server transaction log file?

In some case, the Microsoft SQL Server Database Transaction Log (. LDF) file becomes very huge. It's wasting lot of disk space and causing some problems if you want to backup and restore the database. We can delete log file and create a new log file with the minimum size.

Mee Landgraebe


How does transaction log works in SQL Server?

A transaction log is a sequential record of all changes made to the database while the actual data is contained in a separate file. The transaction log contains enough information to undo all changes made to the data file as part of any individual transaction.

Zoia Birnthaler


Does a full SQL backup include transaction logs?

A full database backup backs up the whole database. This includes part of the transaction log so that the full database can be recovered after a full database backup is restored. For more information, see Differential Backups (SQL Server).

Eleonora Weir


How do I shrink an LDF file?

To shrink an ldf file, you use a command called DBCC SHRINKFILE (documented here). You can do this in SSMS by right-clicking the database, select "Tasks", "Shrink" and "Files". I recommend that you script the command into a query window and execute from there.

Fleta Rosenberger


How do I backup a SQL log file?

SQL Server Management Studio
  1. Right click on the database name.
  2. Select Tasks > Backup.
  3. Select "Transaction Log" as the backup type.
  4. Select "Disk" as the destination.
  5. Click on "Add" to add a backup file and type "C:AdventureWorks.TRN" and click "OK"
  6. Click "OK" again to create the backup.

Anuar Minteguiaga


How can I check the full log file in SQL Server?

  1. Log into the SQL Server Management Studio. You can check the transaction log usage locally on the server or when connected remotely.
  2. Select the database in the Object Explorer. It's in the left panel.
  3. Click New Query.
  4. Find the size of the transaction log.
  5. Find the amount of log space in use.

Marbella Macedo


Where are SQL logs stored?

By default, the error log is located at Program FilesMicrosoft SQL ServerMSSQL. n MSSQLLOGERRORLOG and ERRORLOG.

Trula Mercker


What is a system log?

A system log is a file containing events that are updated by the operating system components.It may contain information such as device drivers,events,operations or even device changes. A system log is used to.

Lesmes Thommas


How do I reduce the size of my database log?

To reduce the size of the transaction log file size, follow the steps as shown below:
  1. In the SQL Server Management Studio, right click on the BizTalk360 database name and select Tasks > Shrink > Files.
  2. Select the file type and file name.
  3. Select the Release unused space radio button.
  4. Click OK.

Xingyu Jidenko


Is full due to Availability_replica?

The transaction log for database ' DBXXXX' is full due to 'AVAILABILITY_REPLICA'. What does this mean? It means the primary database in the primary replica is holding transactions that are not synced to other secondary replicas in the availability group.

Basel Vivien


What is a log backup?

A transaction log backup is a backup of all the transactions that have occurred in the database since the last transaction log backup was taken. You need to perform a full backup before you can create any T-log backups. T-log backups can be thought of as the equivalent of incremental backup.

Lleonard Kunos


Is full due to Log_backup?

This error occurs because the transaction log becomes full due to LOG_BACKUP. Therefore, you can't perform any action on this database, and In this case, the SQL Server Database Engine will raise a 9002 error. Take a Full database backup. Shrink the log file to reduce the physical file size.

Ivonne Espuch


Is it OK to shrink transaction log?

Yes, it's fine. It doesn't affect any existing transactions, nor does it move any data around like database shrinking. Don't shrink it right back though, because growing a log file takes effort.

Iovana Canchado


Why is my transaction log so big?

There are a number of reasons a log file can fill to extreme sizes. The most common one by far is that the database is in full recovery model, and Transaction Log backups are not happening fast enough, or not happening at all.