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ALTER DATABASE Examples
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The following examples demonstrate some of the changes that you can make using the ALTER DATABASE command. This example increases the size of a database le:
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USE master GO ALTER DATABASE Test1 MODIFY FILE ( NAME = 'test1dat3', SIZE = 2000MB);
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Microsoft SQL Server 2008 Internals
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The following example creates a new legroup in a database, adds two 500-MB les to the legroup, and makes the new legroup the default legroup. You need three ALTER DATABASE statements:
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ALTER DATABASE Test1 ADD FILEGROUP Test1FG1; GO ALTER DATABASE Test1 ADD FILE ( NAME = 'test1dat4', FILENAME = 'c:\program files\microsoft sql server\mssql.1\mssql\data\t1dat4.ndf', SIZE = 500MB, MAXSIZE = 1000MB, FILEGROWTH = 50MB), ( NAME = 'test1dat5', FILENAME = 'c:\program files\microsoft sql server\mssql.1\mssql\data\t1dat5.ndf', SIZE = 500MB, MAXSIZE = 1000MB, FILEGROWTH = 50MB) TO FILEGROUP Test1FG1; GO ALTER DATABASE Test1 MODIFY FILEGROUP Test1FG1 DEFAULT; GO
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A database consists of user-de ned space for the permanent storage of user objects such as tables and indexes. This space is allocated in one or more operating system les. Databases are divided into logical pages (of 8 KB each), and within each le the pages are numbered contiguously from 0 to x, with the value x being de ned by the size of the le. You can refer to any page by specifying a database ID, a le ID, and a page number. When you use the ALTER DATABASE command to enlarge a le, the new space is added to the end of the le. That is, the rst page of the newly allocated space is page x + 1 on the le you re enlarging. When you shrink a database by using the DBCC SHRINKDATABASE or DBCC SHRINKFILE command, pages are removed starting at the highest-numbered page in the database (at the end) and moving toward lower-numbered pages. This ensures that page numbers within a le are always contiguous. When you create a new database using the CREATE DATABASE command, it is given a unique database ID, and you can see a row for the new database in the sys.databases view. The rows returned in sys.databases include basic information about each database, such as its name, database_id, and creation date, as well as the value for each database option that can be set with the ALTER DATABASE command. I ll discuss database options in more detail later in the chapter.
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Space Allocation
The space in a database is used for storing tables and indexes. The space is managed in units called extents. An extent is made up of eight logically contiguous pages (or 64 KB of space). To make space allocation more ef cient, SQL Server 2008 doesn t allocate entire extents to tables with small amounts of data. SQL Server 2008 has two types of extents:
Uniform extents These are owned by a single object; all eight pages in the extent can be used only by the owning object. Mixed extents These are shared by up to eight objects.
SQL Server allocates pages for a new table or index from mixed extents. When the table or index grows to eight pages, all future allocations use uniform extents. When a table or index needs more space, SQL Server needs to nd space that s available to be allocated. If the table or index is still less than eight pages total, SQL Server must nd a mixed extent with space available. If the table or index is eight pages or larger, SQL Server must nd a free uniform extent. SQL Server uses two special types of pages to record which extents have been allocated and which type of use (mixed or uniform) the extent is available for:
Global Allocation Map (GAM) pages These pages record which extents have been allocated for any type of use. A GAM has a bit for each extent in the interval it covers. If the bit is 0, the corresponding extent is in use; if the bit is 1, the extent is free. After the header and other overhead are accounted for, there are 8,000 bytes, or 64,000 bits, available on the page, so each GAM can cover about 64,000 extents, or almost 4 GB of data. This means that one GAM page exists in a le for every 4 GB of le size. Shared Global Allocation Map (SGAM) pages These pages record which extents are currently used as mixed extents and have at least one unused page. Just like a GAM, each SGAM covers about 64,000 extents, or almost 4 GB of data. The SGAM has a bit for each extent in the interval it covers. If the bit is 1, the extent being used is a mixed extent and has free pages; if the bit is 0, the extent isn t being used as a mixed extent, or it s a mixed extent whose pages are all in use.
Table 3-2 shows the bit patterns that each extent has set in the GAM and SGAM pages, based on its current use.
TABLE 3-2
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