What is LogLog file in SQL Server?

Question

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. 11 февр. 2014 г.

What is SQL Server log file used for?

Every SQL Server database has a transaction log that records all transactions and the database modifications made by each transaction. The transaction log is a critical component of the database. If there is a system failure, you will need that log to bring your database back to a consistent state.

What is log file in database?

A log file is a computer-generated data file that contains information about usage patterns, activities, and operations within an operating system, application, server or another device.

What happens when SQL 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.

Why is SQL log file so large?

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.

Expert · Answer