How big should my log file be?

Question

A good STARTING POINT for your log file is twice the size of the largest index in your database, or 25% of the database size. Whichever is larger. 13 июл. 2018 г.

What should be the log file size in SQL Server?

VersionDefault valuesStarting with SQL Server 2016 (13.x)Data 64 MB. Log files 64 MB.Starting with SQL Server 2005 (9.x)Data 1 MB. Log files 10%.Prior to SQL Server 2005 (9.x)Data 10%. Log files 10%.

Why is my log file so big?

Large database transactions, such as importing large amounts of data, can lead to a large transaction log file. Transaction log backups not happening fast enough causes the SQL log file to become huge. SQL log files also enlarge due to incomplete replication or availability group synchronization.

What is the size of a log?

OperationSizePut persistent message750 bytes + message length If the message is large, it is divided into segments of 261844 bytes, each segment adding an extra 300 bytes.Get message260 bytesSync point, commit750 bytes

What happens when log file is 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.

Expert · Answer