Figure 4-19 The Restore Database window in Visual Studio .NET

Creating EAN 13 in Visual Studio .NET Figure 4-19 The Restore Database window

Figure 4-19 The Restore Database window
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From the Restore Database window, select the appropriate backup file to restore, and the options you need (for a complete restore, you do not need to check any of the options) The restore process starts, and the results are shown in the Messages tab Please do not wait until you have lost important data to find out that you missed something in the process Now that you have a few sample tables and data, try doing a backup of your test database After you back up the database, remove it by right-clicking the database object and selecting Delete/Drop from the menu After removing the database, create a new skeleton database, then perform the restore process using your backup file After the restore, you will have to click the database object and then click the Refresh icon in the toolbar The new (or rather old) database objects should now be present View the data in the new tables to make sure the data has also been restored You should also try a few table queries using psql to ensure that the privileges have been restored as well It is important to remember that this backup and restore did not affect any of the Login or Group Roles created in the PostgreSQL system While the backup preserved the privileges assigned to objects, it did not create the roles themselves To fully back up your entire PostgreSQL system, use the pg_dumpall utility This creates the SQL statements to restore your entire PostgreSQL system, including Login and Group Roles
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This chapter walked through the many features of the pgAdmin III program, and demonstrated how to use it to perform all of your database administration needs You can use pgAdmin III to create new tablespaces, databases, schemas, tables, and user accounts (Login Roles) From each new table, you can create new columns to hold data, as well as define constraints, indexes, rules, procedures, and triggers After you create new tables and data, you can create Group Roles to assign group privileges to tables and schemas Finally, you use pgAdmin III to create Login Roles (also known as user accounts), and assign them to the appropriate Group Roles An important part of managing a PostgreSQL system is to maintain the database data You can do this using the table maintenance features provided in pgAdmin III The vacuum and reindex functions are essential to maintaining your database performance as you accumulate more data Backing up the database is another important function of the database manager pgAdmin III provides a simple way to back up and restore individual databases, but to back up and entire PostgreSQL system, you must still use the pg_dumpall utility In this chapter, you got a taste of the other powerful PostgreSQL application, psql The next chapter expands on the psql program, showing all of the functions you can perform using the simple command-line interface
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The psql Program
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PostgreSQL 8 for Windows
fter you have installed the PostgreSQL system and created user accounts, databases, and tables using pgAdmin III, it is time to start interacting with your new system While PostgreSQL provides many interfaces to interact with the system, none is as simple as the psql program This simple console application provides full access to the entire PostgreSQL system using both internal meta-commands and SQL statements This chapter dissects the psql program and shows how to use it for all of your database needs
THE PSQL COMMAND-LINE FORMAT
The psql program is a simple Windows console application that provides a commandline interface to the PostgreSQL system Unlike the pgAdmin III program, discussed in 4, which enables you to see graphically all of the database objects and access information with the click of a mouse button, in the psql program you must enter text commands to view and manipulate data While this method may seem old-fashioned by today s computing standards, a knowledgeable database administrator can be more productive just by entering the desired commands and quickly seeing results The psql program is one of the PostgreSQL utility programs located in the bin directory of the PostgreSQL installation directory (see 3) The easiest way to get to the PostgreSQL bin directory is to use the Command Prompt link provided by the PostgreSQL installer in the Windows Start menu Choose Start | Programs | PostgreSQL 82 | Command Prompt (Do not use the Command Prompt link in the Windows Accessories menu area, because it does not point to the PostgreSQL bin directory) By default, when you enter psql by itself at the Windows command prompt, psql attempts to connect to the default postgres database on the PostgreSQL server running on the local system and uses the Windows operating system user account you are currently logged in with as the PostgreSQL user account If you want to log directly into another database, or log in using a different PostgreSQL user account, you have to include some command-line options with the psql command There are lots of command-line options available for psql The following sections walk through all of them
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