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Figure 9-5. The DBUA Welcome window 3. In the Selecting a Database Instance window, first ensure that the database you want to upgrade is running. Then select the instance you want to upgrade, and click Next. 4. In the Recompile Invalid Objects window, select the option to recompile invalid objects. The upgrade process always invalidates several database objects, and you have the option of letting the DBUA automatically recompile invalid database objects as soon as the upgrade is over.

To drop a user, you use the DROP USER statement, as shown here: SQL> DROP USER salapati; User Dropped. SQL> The DROP USER command will remove not only the user, but all objects owned by the user as well. If other objects in the database depend on this user, you won t be able to use the simple DROP USER command you must use the DROP USER . . . CASCADE statement, which drops the user, the user s schema objects, and any dependent objects as well. Here s an example: SQL> DROP USER salapati CASCADE; User Dropped. SQL>

Telling Oracle to recompile invalid objects as part of the upgrade process is the same as running the

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In 16, you ll learn about Oracle s new Recycle Bin, which keeps the database from dropping a table permanently when you issue a DROP TABLE statement. This gives you the chance to revive a dropped table if necessary. When you drop a user, however, all tables and other objects in the user s schema will be dropped permanently, without using the Recycle Bin! Therefore, if you aren t sure whether you will need a user s objects later, but you want to deny access, simply leave the user and the user s schema intact, but deny the user access to the database by using the following command: SQL> REVOKE CREATE SESSION FROM salapati; Revoke succeeded. SQL>

5. In the next window, Choosing a Database Backup Procedure, you can select the option to do a cold backup of your database. If you have already made backups, choose the I Have Already Backed Up My Database option.

We have so far created a new user, assigned the user a set of default and temporary tablespaces, and granted the user the privileges to connect to the database. What is the limit on the amount of database resources this person can use What if he or she unwittingly starts a SQL program that guzzles the CPU resource like crazy and brings your system to its knees You can set the individual resource limits in Oracle by using what are known as profiles. A profile is a collection of resource-usage and password-related attributes that you can assign to a user. Multiple users can share the same profile, and you can have an unlimited number of profiles in an Oracle database. Profiles set hard limits on resource consumption by the various users in the database and help you limit the number of sessions a user can simultaneously keep open, the length of time these sessions can be maintained, and the usage of CPU and other resources. Here, for example, is a profile called miser (because it limits resource usage to a minimum): SQL> CREATE PROFILE miser 2 LIMIT 3 connect_time 120 4 failed_login_attempts 3 5 idle_time 60 6* sessions_per_user 2; Profile created. SQL> When a user with the miser profile connects, the database will allow the connection to be maintained for a maximum of 120 seconds and will log the user out if he or she is idle for more than 60 seconds. The user is limited to two sessions at any one time. If the user fails to log in within three attempts, the user s accounts will be locked for a specified period or until the DBA manually unlocks them.

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