upc nincs internet Hardware Write Cache The hardware write cache not only caches write requests, but in .NET framework

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Hardware Write Cache The hardware write cache not only caches write requests, but
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also fulfills read requests if the data is still available in the hardware write cache. This is a commonly used I/O caching mechanism. Hardware write cache capabilities can be critical in maintaining OLTP performance goals. With the proper battery backup and algorithms, the hardware write cache can secure the data safely (on stable media) as well as increase the speed of SQL Server by hiding much of the true physical I/O time. Write-Ahead Logging (WAL) Protocol A key to ACID property maintenance is the WAL protocol. The WAL protocol requires that all transaction log records associated with a particular data page be flushed to stable media before the data page can be flushed to stable media. SQL Server 2005 uses 8-KB data pages and sector-aligned transaction log buffers. Log Sequence Number The log sequence number (LSN) value is a three-part, uniquely incrementing value. It is used for maintaining the sequence of the transaction log records in the database. This enables SQL Server to maintain the ACID properties and to perform appropriate recovery actions. When a modification occurs, a log record is generated with a new LSN value. The same LSN value is stored in the data page header so the last log record and matching data page can be associated with each other.
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Latching SQL Server uses latches to provide data synchronization. A latch is a user-
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mode reader-writer lock implemented by SQL Server. Each data page in memory has a buffer (BUF) tracking structure. The BUF structure contains status information (Dirty, On LRU, In I/O) as well as a latch structure. Locking maintains the appropriate lock activity; latching controls physical access. For example, it is possible for a lock to be held on a page that is not in memory. The latch is only appropriate when the data page is in memory (associated with a BUF). SQL Server 2005 utilizes the Win32 APIs WriteFileGather and ReadFileScatter for access to the disk subsystem. The WriteFileGather function gathers data from multiple discontinuous buffers and writes the data to a file. The ReadFileScatter function reads data from a file and distributes the data into multiple discontinuous buffers. These APIs enable SQL Server to avoid multiple physical I/O requests. For example, during the checkpoint process, up to sixteen 8-KB pages can be flushed with a single WriteFileGather invocation. Previous versions of SQL Server had to issue an I/O request for each data page, or would have to sort and buffer a larger request itself, leading to possible performance problems on busy systems.
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Scatter-gather capabilities are hardware specific. When the hardware does not support scatter-gather capabilities, the operating system must intervene and issue separate I/O requests. To maximize SQL Server I/O performance, ensure that your subsystem natively supports scatter-gather I/O operations.
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Lazy Writer The lazy writer in SQL Server 2005 attempts to locate up to 16 unique
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pages for each sweep to return to the free list. If the page reference count has dropped to zero, the page is eligible for return to the free list. If the page is marked dirty, the log records and page date will be flushed to disk. Thus, it is possible for the lazy writer to flush 16 * 16 pages to disk in a single sweep. This is efficient because many of the pages will remain in the SQL Server buffer pool but are now in a clean state. I/O is done in the background from the primary SPID. When the lazy writer needs additional buffers for the free list, the buffers might not need to be flushed to disk, but are returned to the free list. Checkpoint The SQL Server 2005 checkpoint process periodically sweeps the buffer pool for buffers that contain pages from a specified database and flushes all dirty buffers to stable media. This makes recovery quicker because roll-forward operations have less physical work to complete.
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