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3. If it locates the page, it acquires the latch to prevent further modifications if the page might be dirty. 4. It checks to ensure that the page is dirty and needs to be written. If it isn t, SQL Server releases the latch and considers the end of contiguous I/O block as established and submits the asynchronous I/O request. If the page is dirty, SQL Server follows the steps described earlier that detail how it flushes a single page. After the set of pages to be flushed is determined, the WriteFileGather function is invoked to post (Async / OVERLAPPED) the I/O request with the associated callback function to complete the I/O operation. When SQL Server determines that HasOverlappedIoCompleted returns TRUE, GetOverlappedResults is used to gather completion information from the system and the callback function is invoked. The callback makes an appropriate determination regarding the success of the I/O operation and releases the latch on each page.

You can configure transactional replication with two options, the Queued Updat ing Subscriber option and the Immediate Updating Subscriber option, as shown in Figure 11-5.

The process for flushing log records to disk is very similar to the way that data pages are written. The log manager is responsible for all writes for all transaction log records for all databases. When a request to flush all log records up to a certain LSN is requested by any worker on the system, the request is queued to the log manager. The worker then waits for a response from the log manager specifying that the I/O has completed successfully. The log manager retrieves from the queue and formats the request; it then posts the I/O on sector-aligned boundaries. The I/O is posted with WriteFile using the OVERLAPPED (async) mechanisms. The log manager can then return to service other queued requests. When the I/O is completed, the completion routine is run to check the success of the write. If the write is successful, the waiting workers can be signaled to continue their operations. Write ordering is critical at this stage. Because multiple log write requests can be posted for the same transaction log, the LSN order must be maintained. For example, pages 5, 10, and 20 are modified by separate transactions. Page 5 was modified first, then 10, and then 20. LSN flush requests occurred for page 5, 10, and 20 and were put in motion in the same order. If the log record(s) for page 5 and 20 are flushed to stable media, only the flush to LSN for page 5 is considered done and SQL Server might only flush page 5. The LSN 10 must be flushed to stable media before 10 and then 20 can be considered to be flushed to the LSN.

11

The only updates the computer had were the regular security updates These updates hadn t caused problems on servers with identical hardware and software configurations, so I didn t think that was the problem After pulling out various components such as network cards and the graphics adapter, but still having the computer bluescreen randomly once every 24 hours, I finally rebooted into a memory diagnostic application This application performed a battery of tests on the server s RAM After 45 minutes of watching the text-only application successfully perform almost all its tests, I was becoming convinced I d hit another dead end in my search for the cause of the problem The final test, however, produced a series of errors indicating a problem with one of the sticks of RAM I removed the troublesome stick and ran the battery of tests again, receiving no errors.