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If the upgrade process doesn t go well, and you need to go back to the pre-upgrade database, the DBUAcreated database backup makes it easy to do so. You can also make a backup manually, prior to starting the upgrade process. If you choose the option to let the DBUA do the backup, it will back up the database files to the file location you specify in the Backup Directory field before it starts the upgrade of the database to the 11.1.0 release. The DBUA will also create a file called db_name_restore.sh (db_name_restore.bat in a Windows system), which enables you to easily restore the current database files if necessary.

Besides user profiles, you can also use some third-party tools that include query governs, which limit the types of queries that users can use within the database, thus ensuring that the database is not loaded down by inefficient queries.

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6. In the Management Options window, you can choose to configure the OEM. The options for database control are the Grid Control or Database Control version of the OEM. The Database Control component is bundled with the installation package, and Oracle automatically installs it; the Grid Control must be installed separately. If you haven t installed the Grid Control software, choose the Database Control option at this point. 7. In the Database Credentials window, you have to choose passwords for the default Oracle users, such as SYSMAN and DBSNMP. 8. In the Recovery Configuration window, you can choose to specify a flash recovery area as well as to enable archiving. 9. In the Network Configuration window, you can use the Listener tab to choose whether you want to register the upgraded database with selected listeners or all the listeners. If you have directory services configured in the new Oracle home, you must use the Directory Service tab and choose to either register the upgraded database with your directory service or not. 10. In the Upgrade Summary window, shown in Figure 9-6,the names of the source and target databases and the database versions are displayed, along with a list of all obsolete and new initialization parameters. An estimate of the time it ll take to upgrade the database is also provided. The DBUA automatically shuts down the database that is being upgraded before it starts the upgrade process. Click Finish to begin.

Oracle databases enable you to set limits on several parameters within a profile. The following sections provide brief explanations of these parameters, which can be divided into two broad types: resource parameters, which are concerned purely with limiting resource usage, and password parameters, used for enforcing password-related security policies.

Figure 9-6. The Upgrade Results window 11. When the database upgrade is finished, you ll see the results in the Upgrade Results window for you to review. You have three options at this point: Configure database passwords. Restore the database to what it was before the upgrade and revert all changes made to the database. Close the window to finish the installation.

The main reason for using resource parameters is to ensure that a single user or a set of users doesn t monopolize the database and server resources. Here are the most important resource parameters that you can set within an Oracle Database 10g database: CONNECT_TIME: Specifies the total time (in seconds) a session may remain connected to the database. CPU_PER_CALL: Limits the CPU time used per each call within a transaction (for the parse, execute, and fetch operations). CPU_PER_SESSION: Limits the total CPU time used during a session. SESSIONS_PER_USER: Specifies the maximum number of concurrent sessions that can be opened by the user. IDLE_TIME: Limits the amount of time a session is idle (which is when nothing is running on its behalf). LOGICAL_READS_PER_SESSION: Limits the total number of data blocks read (from the SGA memory area plus disk reads). LOGICAL_READS_PER_CALL: Limits the total logical reads per each session call (parse, execute, and fetch). PRIVATE_SGA: Specifies a session s limits on the space it allocated in the shared pool component of the SGA (applicable only to shared-server architecture systems). COMPOSITE_LIMIT: Sets an overall limit on resource use. A composite limit is a limit on the sum of several of the previously described resource parameters, measured in service units. These resources are weighted by their importance. Oracle takes into account four parameters to compute a weighted COMPOSITE_LIMIT: CPU_PER_SESSION, CONNECT_TIME, LOGICAL_READS_ PER_SESSION, and PRIVATE_SGA. You can set a weight for each of these four parameters by using the ALTER RESOURCE COST statement, as shown in the following example: SQL> ALTER RESOURCE COST 2 cpu_per_session 200 3 connect_time 2; Resource cost altered. SQL>

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