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A common question pertaining to the use of SQL Server 7 is what s the best way to copy databases. There are several methods for performing the necessary actions: w Backup and restoration We covered backups in 6. Later in this chapter, we ll cover methods for restoring information. Using the backup and recovery features built into SQL Server 7 is probably the best way to copy all the information in your databases. All database objects, including tables, indexes, and stored procedures, will be properly carried over. The one exception relates to security. As we discussed in 4, SQL Server 7 Architecture, the security architecture of SQL Server involves the creation of logins at the server level. These logins are then mapped to database users and roles. If the database logins do not exist on the destination server, you need to either re-create them or remap existing database users to different logins. Data Transformation Services (DTS) DTS is designed not only to move data between compatible data sources, but also to make changes to data during the transfer operation. DTS is an ideal tool for populating data warehouses or for storing information from various data sources in a central location. (We discussed DTS briefly in 4.) When you want to copy information between databases, DTS s Data Transformation Wizard enables you to quickly copy the data. A major benefit is that you can use many different data sources and destinations for information (including ODBC data sources, text files, other RDBMSs, Microsoft Excel spreadsheets, and Microsoft Access databases). Furthermore, custom packages can be created and scheduled to copy data regularly, as needed. During the process, DTS can perform any number of tasks, including sending e-mail to systems and database administrators regarding the success or failure of an operation, or executing a SQL script. When it comes to copying information between installations of SQL Server 7, the tools and features of DTS might be more than what is needed. If, however, you want to copy data to other data sources or want operations to be regularly scheduled, look into using DTS. Generating scripts Through Enterprise Manager, you can quickly and easily generate scripts for creating database objects. Figure 7-2 shows an example of such a script in SQL Server Query Analyzer. (Review 6 for details on the exact steps required for this operation.) The resulting scripts contain only information about the database objects in your database. For example, they include the definition of a table, including data types and any constraints that might be present. The scripts do not, however, contain the INSERT statements required to copy actual data. Overall, generating scripts is a good way to create a blank copy of an existing database. The scripts are also quite useful to developers and database administrators.
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Bulk copy (bcp) The bcp utility can be used to copy information to and from SQL Server databases (as well as to and from many other data sources). The main purpose of bcp is to transfer data in and out of SQL Server 7. Although the files can be used to transfer information between installations of SQL Server 7, there are better methods (such as performing a backup and restoration). If you need to move or copy large quantities of data between applications or different types of database servers, however, bcp can help properly format the information for interchange. You can get more information on using this utility in 6. Scripting server settings In addition to the database objects you might want to copy, you may want to copy server settings between installations of SQL Server 7. Fortunately, there s an easy way to script the creation (or re-creation) of Jobs, Alerts, and Operators defined in SQL Server. To do so, right-click the appropriate object(s) in Enterprise Manager and choose All Tasks from the context-sensitive menu. As illustrated in Figure 7-2, you ll have the option of generating scripts for the existing objects. The scripts are useful because they avoid manual data reentry and, in some cases, can be easier to use and maintain than the same options accessed via the GUI of Enterprise Manager.
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