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What information is contained in the transaction log files?
The transaction log contains enough information to undo all changes made to the data file as part of any individual transaction. The log records the start of a transaction, all the changes considered to be a part of it, and then the final commit or rollback of the transaction.
What is inside transaction log?
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. When a user issues an INSERT, for example, it is logged in the transaction log.
What does the name of the transaction log file mean?
With multiple files, one file can be corrupted and you’d lose the ability to restore maybe an hour or two of email, which isn’t nearly that big a deal. At any rate, each transaction log file has a name that starts with the letter E and then a string of numbers, followed by the .log extension.
How to find the last exchange transaction log?
When you mount any Exchange database, the Exchange server will do the following: Read the last transaction log property on the database (Assuming the database was properly shut down). Examine the .chk file in the Log Files directory to determine what the last log file that *should* be applied to the database is named.
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.
What happens if there is no transaction log backup?
Recall that only the Transaction Log backup, but NOT the database Full backup, will truncate the Transaction Logs from the Transaction Log file and makes it available for reuse. 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.