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What is a transaction log and what is its function give a detailed answer?
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 log file in Mobile?
In Android, logs are a shared resource and are available to an application with the READ_LOGS permission. Even though the phone log data is temporary and erased on reboot, inappropriate logging of user information could inadvertently leak user data to other applications.”
What are the contents of the transaction log file?
The transaction log will record that the row in the table with the column values 9, ‘New Loc22′, ’41BC2FF6-F0FC-475F-8EB9-CEC1805AA0F6’, and ‘2002/06/01 00:00:00.000’ is deleted. From the table structure, the tool will read that the Primary key is the AddressType column, and will create the following redo script:
Where are transaction logs stored in SQL Server?
Physically, the sequence of log records is stored efficiently in the set of physical files that implement the transaction log. There must be at least one log file for each database. The SQL Server Database Engine divides each physical log file internally into a number of virtual log files (VLFs).
How is the transaction log represented in a VLF?
Internally it is split into the smaller parts called Virtual Log Files (VLFs). When one VLF becomes full logging continue to write into the next available in the transaction log. The transaction log file can be represented as a circular file.
When to truncate SQL Server transaction log file?
If no Transaction Log backup is taken from the database, the Transaction Log file will grow continuously, without truncation, until it runs out of free space. The SQL Server Transaction Log backup can be taken only from the database when the recovery model of that database is Full or Bulk-Logged.