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Physically, the transaction log is one or more les associated with a database at the time the database is created or altered Operations that perform database modi cations write records in the transaction log that describe the changes made (including the page numbers of the data pages modi ed by the operation), the data values that were added or removed, information about the transaction that the modi cation was part of, and the date and time of the beginning and end of the transaction SQL Server also writes log records when certain internal events happen, such as checkpoints Each log record is labeled with a Log Sequence Number (LSN) that is guaranteed to be unique.

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All log entries that are part of the same transaction are linked so that all parts of a transaction can be located easily for both undo activities (as with a rollback) and redo activities (during system recovery) The Buffer Manager guarantees that the transaction log will be written before the changes to the database are written (This is called write-ahead logging) This guarantee is possible.

because SQL Server keeps track of its current position in the log by means of the LSN Every time a page is changed, the LSN corresponding to the log entry for that change is written into the header of the data page Dirty pages can be written to the disk only when the LSN on the page is less than or equal to the LSN for the last record written to the log The Buffer Manager also guarantees that log pages are written in a speci c order, making it clear which log blocks must be processed after a system failure, regardless of when the failure occurred The log records for a transaction are written to disk before the commit acknowledgement is sent to the client process, but the actual changed data might not have been physically written out to the data pages.

11. From the Select Item and Add to List Below drop-down list, select Separator, and click the Add button. Change its ForeColor property to System:HotTrack. 12. From the Select Item and Add to List Below drop-down list, select MenuItem, and click the Add button. Change the control s properties using the values shown in Table 9-6. Property (Name) ForeColor Text

Although the writes to the log are asynchronous, at commit time the thread must wait for the writes to complete to the point of writing the commit record in the log for the transaction (SQL Server must wait for the commit record to be written so that it knows the relevant log records are safely on the disk) Writes to data pages are completely asynchronous That is, writes to data pages need only be posted to the operating system, and SQL Server can check later to see that they were completed They don t have to be completed immediately because the log contains all the information needed to redo the work, even in the event of a power failure or system crash before the write completes The system would be much slower if it had to wait for every I/O request to complete before proceeding.

Logging involves demarcating the beginning and end of each transaction (and savepoints, if a transaction uses them) Between the beginning and ending demarcations is information about the changes made to the data This information can take the form of the actual before and after data, or it can refer to the operation that was performed so that those values can be derived The end of a typical transaction is marked with a Commit record, which indicates that the transaction must be re ected in the database s data les or redone if necessary A transaction aborted during normal runtime (not system restart) due to an explicit rollback or something like a resource error (for example, an out-of-memory error) actually undoes the operation by applying changes that undo the original data modi cations The records of these changes are written to the log and marked as compensation log records.

As mentioned previously, there are two types of recovery, both of which have the goal of making sure the log and the data agree A restart recovery runs every time SQL Server is started The process runs on each database because each database has its own transaction log Your SQL Server error log reports the progress of restart recovery, and for each database, the error log tells you how many transactions were rolled forward and how many were rolled back This type of recovery is sometimes referred to as crash recovery because a crash, or unexpected stopping of the SQL Server service, requires the recovery process to be run when the service is restarted If the service was shut down cleanly with no open transactions in any database, only minimal recovery is necessary upon system restart.

In SQL Server 2008, restart recovery can be run on multiple databases in parallel, each handled by a different thread..