In this article, we will consider the SQL Server transaction log reading for the following purposes: Rolling back changes Replicating changes to another database. A schema of a recruiting agency database It is worth noting that with the current functionality of the tool you can view a transaction log only offline. Creating a new project Step 2. Selecting a. Configuring options to customize the log output The screen will display the Transaction Log loading window showing the process of collecting information according to the configured options.
A project for finding database operations in a transaction log Step 4. Project window As you can see, the project window displays a table and the details for each selected row. The details include: 1 Properties that describe the transaction itself. Properties of the transaction 2 T-SQL transaction script. T-SQL script to undo the transaction Step 5. Selecting committed transactions Step 6. Selecting the transactions associated with the Employee table Thus, we get all committed transactions associated with the Employee table.
Generating a script to roll back all committed transactions associated with the Employee table Step 8. Generated script to undo the changes Read SQL transaction log files for replicating changes to another database Similarly, you can generate a script that was used to create the transactions.
Generating a script to replicate all committed transactions associated with the Employee table Conclusion Thus, the generated scripts allow you to change the previously committed SQL Server transactions and replicate those transactions in case of data loss. This is a special configuration option that is quite similar to the Full Recovery Model. The only difference between this model and the Full Recovery Model is that this model allows some operations to be minimally logged. This model should be used when the database is subjected to bulk operations on a regular basis and the growth of the Microsoft SQL Server Transaction Log file has to be prevented.
The query to perform the operation is as follows:. The Transaction Log Space has to be monitored regularly. If the database has a lot of users, this monitoring has to be done on daily basis. The Transaction Log file should be cleared every time a backup is made to ensure that no Auto Growth Operations take place.
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Your email address will not be published. You may use these HTML tags and attributes:. All the transactions must fullfil these characteristics:. Adding multiple transaction log files will not improve performance of the SQL Server database in any way. Having multiple transaction log files is recommended only if the first one is full or the disk drive is running out of space.
Either way, these problems should be addressed earlier and handled by creating transaction log backups and monitoring available space on the disk drive. Every transaction is followed by logging into the online transaction log. During SQL Server work, the transaction log grows if changes are made into a database, therefore maintaining the transaction log is crucial for proper SQL Server operation. The transaction log is an integral part of SQL Server.
Every database has a transaction log that is stored within the log file that is separate from the data file. A transaction log basically records all database modifications. This enables the database to roll back or restore the transaction if a failure were to occur and prevents data corruption.
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