Guide to SQL Server Transaction Log ArchitectureKristen Smith
All SQL Server databases like those offered by Microsoft maintain a transaction log. It aims to record all the database modifications made on each transaction. For effective database management, this transaction log is a critical component. Which comes into use when there is a system failure. This log is also essential in ensuring small businesses with data backup. A transaction log is a must to bring the database back to the consistent state in system failure. This is a brief overview of the architecture (physical and logical) of an ideal transaction log. Understanding this will improve your ability to manage the transaction logs better.
The Logical Architecture of SQL Server
- A logical operation gest logged
- To roll it forward, one needs to perform the operation again.
- To roll it back, one performs a reverse logical operation
- Logging of before & after images
- To roll operation forward, one must apply an afterimage
- To roll an operation back, before the image applies
- Many of these operations go into the transaction log.