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Also included in the storage engine are managers for controlling utilities such as bulk load, DBCC commands, backup and restore operations, and the Virtual Device Interface (VDI). VDI allows ISVs to write their own backup and restore utilities and to access the SQL
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Server data structures directly, without going through the relational engine. There is a manager to control sorting operations and one to physically manage the files and backup devices on disk.
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One of the major goals of Microsoft SQL Server 2000 was to scale easily from a laptop installation on Windows 95 or Windows 98 to an SMP server running on Windows NT/2000 Enterprise Edition. This requires an extremely robust policy for managing memory. By default, SQL Server 2000 adjusts its uses of system memory to balance the needs of other applications running on the machine as well as the needs of its own internal components. SQL Server can also be configured to use a fixed amount of memory. Whether memory allocation is fixed or dynamically adjusted, the total memory space is considered one unified cache and is managed as a collection of various pools with their own policies and purposes. Memory can be requested by and granted to any of several internal components.
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The buffer pool is a memory pool that s the main memory component in the server; all memory not used by another memory component remains in the buffer pool. The buffer manager manages disk I/O functions for bringing data and index pages into memory so that data can be shared among users. When other components require memory, they can request a buffer from the buffer pool. Another memory pool is the operating system itself. Occasionally, SQL Server must request contiguous memory in larger blocks than the 8K pages that the buffer pool can provide. Typically, use of large memory blocks is kept to a minimum, so direct calls to the operating system account for a very small fraction of SQL Server s memory usage. The procedure cache can be considered another memory pool, in which can be stored query trees and plans from stored procedures, triggers, or ad hoc queries. Other pools are used by memory-intensive
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System Architecture of SQL Server
queries that use sorting or hashing, as well as by special memory objects that need less than one 8K page.
Access to In-Memory Pages
Access to pages in the buffer pool must be fast. Even with real memory, it would be ridiculously inefficient to have to scan the whole cache for a page when you are talking about hundreds of megabytes, or even gigabytes, of data. To avoid this inefficiency, pages in the buffer pool are hashed for fast access. Hashing is a technique that uniformly maps a key (in this case, a dbid-fileno-pageno identifier) via a hash function across a set of hash buckets. A hash bucket is a page in memory that contains an array of pointers (implemented as a linked list) to the buffer pages. If all the pointers to buffer pages do not fit on a single hash page, a linked list chains to additional hash pages. Given a dbid-fileno-pageno value, the hash function converts that key to the hash bucket that should be checked; in essence, the hash bucket serves as an index to the specific page needed. By using hashing, even when large amounts of memory are presently in use, you can find a specific data page in cache with only a few memory reads (typically one or two).
TIP: Finding a data page might require that multiple hash buckets be accessed via the chain (linked list). The hash function attempts to uniformly distribute the dbid-fileno-pageno values throughout the available hash buckets. The number of hash buckets is set internally by SQL Server and depends on the total size of the buffer pool.
Access to Free Pages (Lazywriter)
A data page or an index page can be used only if it exists in memory. Therefore, a buffer in the buffer pool must be available into which the page can be read. Keeping a supply of buffers available for immediate use is an important performance optimization. If a buffer is not readily available, many memory pages might have to be searched simply to locate a buffer to use as a workspace.
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