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CHAPTER 3 DATABASE DESIGN AND CREATION
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Figure 3-9. General settings in the New Database dialog The General dialog within this option collects the first two pieces of information. The first piece of information required is the database name. No checks are done at this point as to whether the database exists (this comes when you click OK); however, there is some validation in the field so that certain illegal characters will not be allowed.
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Note Illegal characters for a database name are as follows:
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Keep to alphabetic, numeric, underscore, or dash characters. Also, you may want to keep the database name short, as the database name has to be entered manually in many parts of SQL Server.
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Below the database name is the owner of the database. This can be any login that has the authority to create databases. A server in many but not all installations can hold databases that belong to different development groups. Each group would have an account that was the database owner and at this point you would assign the specific owner. For the moment, let it default to the <default> account, which will be the account currently logged in to SQL Server; you ll learn how to change this later. If you re using Windows authentication, then your Windows account will be your user ID, and if you re using SQL Server authentication, it will be the ID you used at connection time. The database owner initially has full administration rights on the database, from creating the database, to modifying it or its contents, to even deleting the database. It is normal practice for a database administrator type account to
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CHAPTER 3 DATABASE DESIGN AND CREATION
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create the database, such as a user that belongs to the Builtin\Administrators group, as this is a member of the sysadmin role, which has database creation rights. Ignore the check box for full-text indexing. You would select this option if you wanted your database to have columns that you could search for a particular word or phrase. For example, search engines could have a column that hold a set of phrases from web pages, and full-text searching could be used to find which web pages contain the words being searched for. The File Name entry (off screen to the right in Figure 3-9) is the name of the physical file that will hold the data within the database you re working with. By default, SQL Server takes the name of the database and adds a suffix of _Data to create this name. The database files are stored on your hard drive with an extension of .MDF for example, ApressFinancial_Data.MDF. In this case, .MDF is not something used by DIY enthusiasts, but it actually stands for Master Data File and is the name of the primary data file. Every database must have at least one primary data file. This file holds not only the data for the database, but also the location of all the other files that make up the database. It is also possible to have secondary data files. These would have the suffix .NDF. Again, you could use whatever name you wished, and in fact you could have an entirely different name from the primary data file. However, if you did so, the confusion that would abound is not worth thinking about. So do use the same name, and if you needed third, fourth, and so on, then add on a numerical suffix. You would place the file name for a secondary data file in the row below the ApressFinancial_Data entry in the Data Files list box, after clicking the Add button. I ll come back to why you can have a secondary data file when I talk about file properties later in this section. The File Type column shows whether the file is a data file or a log file, as in a file for holding the data or a file for holding a record of the actions done to the data. The next column in the grid is titled Filegroup. This allows you to specify the PRIMARY filegroup and any SECONDARY data file groups for your database. Every database must have a Primary filegroup. To designate secondary data files, click the Add button to add a new data or log file and then click on the drop-down arrow on the third row. This will bring up a dialog box where you can enter SECONDARY into a Name field (see Figure 3-10). You may use any name for secondary data files, but it is advisable to choose a name that closely resembles the primary filegroup name. You can also make that new name the default filegroup, which will become the filegroup to which further additions of data files will be assigned. Also, if you make the new name the default filegroup, it will be in to this area that tables, views, and so on will be assigned unless otherwise specified.
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