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Why is transaction log important?
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.
How do I clear the transaction log?
Some things you don’t want to do
- Back up the log with TRUNCATE_ONLY option and then SHRINKFILE .
- Detach the database, delete the log file, and re-attach.
- Use the “shrink database” option.
- Shrink the log file to 1 MB.
- Create a second log file.
How do I clear the database transaction log?
To delete data or log files from a database Expand Databases, right-click the database from which to delete the file, and then click Properties. Select the Files page. In the Database files grid, select the file to delete and then click Remove. Click OK.
What does Circular logging mean on an exchange?
What circular logging means is that when Exchange has completed all operations needing the transaction log files (which has different meanings for non-replicated, replicated HA copies and replicated lagged copies), Exchange will truncate those logs. It deletes them upon truncation.
Why is my transaction log cannot be truncated?
When I run the command DBCC LOGINFO, a few of the Status rows contain 2. Now I want to check why my transaction log cannot be truncated. How do I see this? Does the 2 mean in the Status that they are not reusable or an action is waiting (backup, restore)? Is it saying that it cannot be truncated?
How is the transaction log implemented in SQL Server?
The transaction log is implemented as a separate file or set of files in the database. The log cache is managed separately from the buffer cache for data pages, which results in simple, fast, and robust code within the SQL Server Database Engine.
Do you need to turn off Circular logging?
If you plan to use anything other than Full copies each day you will have to turn circular logging off otherwise you won’t be able to restore back multiple incremental backups and hence roll forward. MS, DAG’s are the best thing since sliced bread, well done.