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CHAPTER 3 EXPLORING, CREATING, AND RECOVERING DATABASES
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database with the model database. By contrasting the output from the sp_helpdb system-stored procedure with that for Database_2, you can see changes that the CREATE DATABASE statement makes to the model database design when creating a new database with no clauses. In addition, the script concludes by dropping Database_2 because there is no need to persist the new database. The DROP DATABASE statement removes whatever database you name as an argument when you invoke the statement. This statement operates similarly to the Delete command in Object Explorer for a database, except that it does not automatically refresh the Object Explorer listing of databases. EXEC sp_helpdb model CREATE DATABASE Database_2 EXEC sp_helpdb Database_2 DROP DATABASE Database_2 Figure 3-6 shows the four result sets that the preceding script generates. The first two result sets are for the model database, and the second two result sets are for Database_2. The CREATE DATABASE statement assigns the database name to the primary data file. The statement appends _log to the database name for the name of the log file. Figure 3-6 shows Database_2 settings nearly exactly match settings for the model database. The size of Database_2 is nearly identical to that of the model database (the difference is just 8KB for the log file). The size of the data file in the primary file group is the same in both the model and Database_2 databases. In addition, the growth column values are identical for the data and log files in both databases. The model database explicitly states an UNLIMITED maximum size for its data and log files. Database_2 has essentially unlimited size for both its data and log files. For example, the maximum size of its log file exceeds the capacity of an SSE database (4GB).
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Figure 3-6. Using the CREATE DATABASE statement without clauses creates a near-replica of the model database.
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Designating Data Files in the ON Clause
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The ON clause for the CREATE DATABASE statement lets you specify one or more data files for a database. These files hold the system and user data in a database. Recall that a database can have just one primary data (.mdf) file. The primary data file is the start of a database. Other data files (besides the primary data file) listed in the ON clause are secondary data (.ndf) files. A database can have only one primary data file, but it can have multiple secondary data files. These secondary files can hold data that does not fit in the primary data file or facilitate spreading the data for a database across multiple storage devices with each secondary data file being on a separate storage device.
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CHAPTER 3 EXPLORING, CREATING, AND RECOVERING DATABASES
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The vast majority of applications using SSE should have no need for secondary data files. This is because SSE especially targets smaller database applications in which all data can conveniently fit within the primary data file. In addition, SSE does not support the enterprise features normally associated with advanced hardware options, such as multiple storage devices, and secondary data files are optimized for use with multiple storage devices.
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Data files have logical and operating system file names. In the ON clause, use the NAME keyword to designate a data file s logical name FILENAME keyword to denote the operating system file name, including its path You can specify multiple files in the primary file group, and you can even specify multiple file groups in an ON clause. However, it is common for databases to have a single data file in a single file group. This sole data file serves as the primary data file in the primary file group. The database file specification design of a single data file in a single file group is likely to be particularly common on SSE instances. You can optionally use the PRIMARY keyword in the ON clause to designate the primary file group. The primary file group consists of the primary data file and any secondary files that you include in the file group. If there is just one file group without any other file groups specified, the file group is, by default, the primary file group. Use the FILEGROUP keyword to designate other file groups besides the primary file group. The following script demonstrates the syntax for specifying the primary data file in a CREATE DATABASE statement. As with the preceding CREATE DATABASE sample, this sample concludes by displaying sp_helpdb results for the newly created database. The last line in the following sample drops the database because the only purpose for the database is to show syntax rules. The script s ON clause opens the specification for the primary file group, which has just one data file. A data file s location is not restricted to the Data folder for an SSE instance in the Program Files directory. Notice that the FILENAME argument points at the chapter03 folder within the prosseapps directory on the C: drive. The directory and folder names are for the main test computer used for the book. You can use any directory and folder names on your computer. Although a file s logical name and file specification point to the same file, the logical name and file name in the specification do not have to be the same. Notice the NAME argument has a suffix (_dat) appended to the end of the argument value for the FILENAME keyword. In addition to specifying the names and locations of data files, you can also assign argument values to control the initial size of a file, the maximum size of a file, and how a file grows from its initial size to its maximum size. The SIZE keyword lets you specify the initial size. You can designate the argument value for this keyword as kilobyte (KB), megabyte (MB), gigabyte (GB), or terabyte (TB) units. Fractions are not recognized, but you can designate half a megabyte as 512KB. The MAXSIZE keyword specifies a file s maximum size. You can specify units as KB, MB, GB, and TB. In addition, you can use UNLIMITED to designate a file s maximum size. If you specify a number for either SIZE or MAXSIZE without designating a type of unit, the T-SQL interpreter assumes MB. The FILEGROWTH keyword designates how to grow a data file when a database requires more space. The FILEGROWTH argument value cannot exceed the MAXSIZE argument value. You can specify FILEGROWTH in KB, MB, or percentage units.
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