generate barcode in vb.net Lesson 1: Designing Database Tables in Visual C#

Make UPC A in Visual C# Lesson 1: Designing Database Tables

Lesson 1: Designing Database Tables
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2. Which of the following objects can be used in a check constraint (Choose all that apply.) A. System function B. Stored procedure C. User-defined function (UDF) D. View 3. Which data type would you use to store up to 2 GB of text data and still be able to query and manipulate it using standard functions and operators A. text B. varbinary C. varchar(max) D. varchar 4. Which column definition is the best choice for a primary key A. text data type B. integer data type with the identity property C. decimal data type that allows nulls D. integer data type based on a physical attribute of a business entity
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12
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Designing the Physical Database
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Lesson 2: Designing Filegroups
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Filegroups define the basic storage architecture for all objects within a database. A properly defined set of filegroups can enable you to target backup and restore opera tions at a portion of a database. The filegroup structure that you define can also affect performance characteristics for disk operations and enable partitioning capabilities. This lesson describes how to appropriately define filegroups within your databases.
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After this lesson, you will be able to:
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Design file groups.
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Design file groups for performance. Design file groups for recoverability. Design file groups for partitioning.
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Estimated lesson time: 90 minutes
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Designing Filegroups
Filegroups provide the structural organization for the physical files on disk that com pose a database. Although it is impossible to have a database without also having a filegroup, having more than one filegroup for a database is not required. The primary reasons why databases are designed with multiple filegroups are for performance and recoverability.
Designing Filegroups for Recoverability
Filegroups need to have at least one file and can contain multiple files that span disk drives. A filegroup provides the storage boundary for all objects within a database except for tables, indexes, and indexed views, all of which are partitioned. Unparti tioned objects must reside within a single filegroup, although the data contained within an unpartitioned object can span more than one file. To understand this concept, let s take a look at a table. The data within a table must be stored on disk to ensure persistence. The physical storage structure in which data from a table is stored is one or more database files. However, the table itself is defined to reside on a single filegroup. The filegroup is the storage structure that contains one or more files, so that when a table is defined for a given filegroup, the data is stored within one or more files.
Lesson 2: Designing Filegroups
If a filegroup contains only a single file, understanding the physical location of data is simple. However, if a filegroup contains more than one file, it is impossible to tell which piece of the table resides in which physical file. SQL Server effectively stripes the data across all of the files within a filegroup. The location of data is important when dealing with recoverability. SQL Server 2005 allows for online restore operations. As long as you do not need to restore the primary filegroup, the database can remain online through a restore oper ation. The only data that will be unavailable will be within the filegroup(s) that is(are) being restored. SQL Server 2005 allows for either a file or filegroup backup. However, file backups are essentially worthless and should not be part of your backup strategy. If a filegroup contains only a single file, backing up the filegroup is the same as backing up the file. However, if the filegroup contains more than one file, backing up one of the files is a waste of time; it is impossible to restore just a single file within a filegroup because all files are required to reconstitute any objects within the filegroup. Therefore, simply using filegroup backups in the first place means that you are backing up along the most granular boundary of the database that you can use for a restore operation.
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