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Part III
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SQL Server requires that a transaction is written to the log file on disk first, before any data file changes are written to disk. Thus, the SQL Server transaction log is known as a write-ahead log. This guarantees that no data is written to disk until its associated log record is written to disk. Once the data is written to disk, it is made permanent in the database.
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Since data changes are not written to disk immediately, the transaction log file is the only means by which transactions can be recovered in the event of a system failure. Any data in memory, including the data buffer cache and the log buffer cache, are lost in the event of system failure and therefore cannot be used for recovery. There are two ways in which the transaction log may be used for data recovery: through automatic recovery performed by SQL Server and through restoring backups of the transaction logs. Note
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Transaction log backups are required in order to recover a damaged database up to the point of failure. If SQL Server automatic recovery will not suffice and if you have only data backups without transaction log backups, then you can recover data only up to the last data backup. Therefore, be sure to perform transaction log backups for critical databases that allow modifications. If a database is read-only, then you do not need transaction log backups and can set the database to the simple recovery model as described later in the chapter.
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SQL Server uses the records stored in the transaction log to perform automatic data recovery in the case of a power failure or an unclean shutdown of SQL Server in which data is not damaged or corrupted in any way. In this case, backups are not needed to recover the database. This is normal SQL Server operation. Automatic recovery occurs per database every time SQL Server starts up and occurs with all of the recovery models simple, bulk-logged, or full discussed in the next section. SQL Server always logs enough data in the transaction log to be able to perform automatic recovery when necessary, even with the simple recovery model. When a system failure such as a power loss occurs, there may be transactions in flight, or active, that have uncommitted records written to the log file. There may also be committed transactions whose records were written to the log file with a commit record but whose associated changes to the data files have not yet been written. To resolve these inconsistencies and maintain data integrity, SQL Server performs automatic recovery on each database upon restart. No user intervention is required other than restarting SQL Server.
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During automatic recovery, transactions that were committed in the log file but whose data changes were not yet written to the data files are rolled forward, meaning that by reading the committed transaction records from the log and replaying those records (in other words, rolling forward the transaction), the appropriate data changes are written to the data files on disk and thus made permanent in the database. Any transactions that were not committed yet and have uncommitted records in the transaction log are rolled back, meaning the changes to the data files made by those records are reversed as if the transaction never started. This leaves each database in a consistent state.
Recovery Models and Logging
Each database is configured with a particular SQL Server recovery model that determines the manner in which transaction logging and SQL Server recovery are handled. When you create a database, the recovery model for that database is set to the recovery model of the system model database. If you do not change the model database recovery model setting after SQL Server installation, then all user databases are created with the Full recovery model setting, the default of the model database. The recovery model can be changed using the Management Studio or T-SQL commands. The following sections describe the three possible recovery models: simple, full, and bulk-logged. For all three recovery models, data backups must be taken to ensure that data can be recovered when automatic recovery will not suffice. The main difference between the types is the method in which transaction logs are managed and backed up.
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