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scan. If the anticipated number of pages is small, all the pages are requested by the initial read ahead; if the pages are contiguous, they are fetched in scatter reads. If the range contains a large number of pages, the initial read ahead is performed, and thereafter, every time another 16 pages are consumed by the scan, the index is consulted to read in another 16 pages. This has several interesting effects:
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Small ranges can be processed in a single read at the data page level whenever the index is contiguous. The scan range (for example, state = NV ) can be used to prevent reading ahead of pages that will not be used, since this information is available in the index. Read ahead is not slowed by having to follow page linkages at the data page level. (Read ahead can be done on both clustered indexes and nonclustered ones.)
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NOTE: Scatter-gather I/O and asynchronous I/O are available only to SQL Server running on Windows NT/2000. This includes the desktop edition of SQL Server if it has been installed on Windows NT/2000 Workstation.
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The Log Manager
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All changes are written ahead by the buffer manager to the transaction log. Write-ahead logging ensures that all databases can be recovered to a consistent state even in the event of a complete server failure, as long as the physical medium (hard disk) survives. A process is never given acknowledgment that a transaction has been committed unless it is on disk in the transaction log. For this reason, all writes to the transaction log are synchronous SQL Server must wait for acknowledgment of completion. Writes to data pages can be made asynchronously, without waiting for acknowledgment, because if a failure occurs the transactions can be undone or redone from the information in the transaction log.
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The log manager formats transaction log records in memory before writing them to disk. To format these log records, the log manager maintains regions of contiguous memory called log caches. Unlike in previous versions, in SQL Server 2000 log records do not share the buffer pool with data and index pages. Log records are maintained only in the log caches. To achieve maximum throughput, the log manager maintains two or more log caches. One is the current log cache, in which new log records are added. The log manager also has two queues of log caches: a flushQueue, which contains log caches waiting to be flushed, and a freeQueue, which contains log caches that have no data and can be reused. When a user process requires that a particular log cache be flushed (for example, when a transaction commits), the log cache is placed into the flushQueue (if it is not already there). Then the thread (or fiber) is put into the list of connections waiting for the log cache to be flushed. The connection does no further work until its log records have been flushed. The log writer is a dedicated thread that goes through the flushQueue in order and flushes the log caches out to disk. The log caches are written one at a time. The log writer first checks to see if the log cache is the current log cache. If it is, the log writer pads the log cache to sector alignment and updates some header information. It then issues an I/O event for that log cache. When the flush for a particular log cache is completed, any processes waiting on that log cache are awakened and can resume work.
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THE SQL SERVER KERNEL AND INTERACTION WITH THE OPERATING SYSTEM
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The SQL Server kernel is responsible for interacting with the operating system. It is a bit of a simplification to suggest that SQL Server has one module for all operating system calls, but for ease of understanding, you can think of it in this way. All requests to
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