c# barcode generator source code Figure 3-10. New filegroup in Visual C#.NET

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Figure 3-10. New filegroup
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CHAPTER 3 DATABASE DESIGN AND CREATION
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The logic behind secondary data files is relatively straightforward. A primary filegroup will always and must always contain the system tables that hold the information about the database, the tables, the columns, and so on. If you have the Autogrowth file option (covered shortly) switched off, then the primary filegroup is likely to run out of space at some point. If this happens, and no secondary data files are specified, then the database will grind to a halt until some space is added. However, in most instances, especially when you re first starting out, you can leave the database with only a primary filegroup. Don t misunderstand filegroups and space, though: filegroups are there to help you organize your files within your database storage, and the files that make up the filegroup may span several disks for a performance issue. You will move files around filegroups for speed, efficiency, security, backups, and a number of other reasons. However, you can still hold all the files in one filegroup the primary filegroup which is what you ll do throughout this book.
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Note Remember that the primary filegroup may hold not only data, but also the system tables, so the
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primary filegroup could fill up purely with information about tables, columns, and so forth.
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The next item is the Initial Size (MB) column. The initial size of the database is its size when empty. Don t forget that the database won t be totally empty, and some of the space will be initially taken up with the system tables. It is impossible to say, I m creating a database, and the initial size must be nnMB the database size depends on many factors, such as the number of tables, how much static information is stored, to what size you expect the database to grow, and so on. Moving on to the next, and possibly most important, area: Autogrowth. This option indicates whether SQL Server will automatically handle the situation that arises if your database reaches the Initial Size limit. If you don t set this option, you will have to monitor your database and expand its size manually, if and when required. Think of the overhead in having to monitor the size, let alone having to increase the size! It is much easier and less hassle, and much less of a risk, to let SQL Server handle this when starting out.
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Note In a production environment, or even when you re developing in the future, it will be more common to switch Autogrowth off and fix the size. This prevents your hard drive from filling up and your server from being unable to continue. At least when you fix the size, you can keep some hard drive space in reserve to enable your SQL Server to continue running while the development team tries to clear out unwanted data.
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While SQL Server handles increasing the size of the database for you, it has to know by how much. This is where the Autogrowth option comes in. You can let SQL Server increase the database either by a set amount each time in megabytes or by a percentage. The default is By Percent, and at this stage it doesn t really matter. In our example, the first increase will be 2MB; the second increase will be 2.2MB. For our example, this is sufficient, as there won t be a great deal of data being entered. However, the percentage option does give uneven increases, and if you like order, then By MB the option for you. If you want to change these options by selecting the autogrowth options button (the ellipsis) to the right of the current setting, you can disable autogrowth of your database in the dialog that appears. You can also, as discussed, alter it to increase by By MB rather than By Percent.
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