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What is the use of transaction log file?

Contents
  1. What is the use of transaction?
  2. What is the use of transaction logs in forensics?
  3. What type of file is a transaction log file?
  4. What happens when transaction log is full?
A transaction log is used to record the fact that a transaction is set to occur as well as the information needed by the database server to recover the data back to a consistent state in event of a sever failure while it is writing information to disk.


What is the use of transaction?

A transaction is any unit of work done against the database. A transaction can be used to save the changes made to the database, it can be used to rollback the database to any save point. For example say if you are creating or updating a record or deleting a record from the table then you are performing a transaction.

What is the use of transaction logs in forensics?

Because it keeps track of all transaction happens in database and modification done by each transaction. In fact, it is used to restore the entire database in a system failure situation. Along with this, SQL Transaction log file is the only way used in forensic analysis of database tampering on a specific time.

What type of file is a transaction log file?

A SQL Server transaction log file is an integral part of every SQL Server database. Along with the data file, which has an MDF extension, the transaction log file with a LDF extension, makes a SQL Server database. A SQL Server database can have more than one data file. These additional data files have an NDF extension.

What happens when transaction log 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.

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