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If you aren t sure you want to upgrade to the new version at the conclusion of the DBUA upgrade process, you can simply click the Restore button to revert to the previous database version. If the DBUA backed up your database, then Oracle will automatically restore the original database and the original database settings. If the DBUA didn t do the backup, the DBUA can t automatically revert the database to the previous version. You ll have to use your backups to manually restore the database from the earlier version. You can also run an Oracle-provided script at a later time to go back to the previous database. Oracle automatically creates this script when you select to back up the database during the beginning of the upgrade process.

If you don t use a weight for any of these four parameters, the parameters will be ignored in the computation of the COMPOSITE_LIMIT parameter.

Let s step through the manual database upgrade process in this section so you understand what happens during a database upgrade. Recall that the DBUA does a lot of the following steps for you.

Oracle provides you with a wide variety of parameters to manage user passwords. You can set the following password-related profile parameters to enforce your security policies: FAILED_LOGIN_ATTEMPTS: Specifies the number of times a user can attempt to log in before being locked out. PASSWORD_LIFE_TIME: Sets the time limit for using a particular password. If you don t change the password within this specified time, the password expires.

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Following are the various scripts you use for upgrading to Oracle Database 11g. You ll find all these scripts in the $ORACLE_HOME/rdbms/admin directory. catdwgrd.sql enables a direct downgrade from the Oracle Database 11g release to the Oracle Database 11g release from which you upgraded. catupgrd.sql enables a direct upgrading to the Oracle Database 11g release. utlu111i.sql analyzes the database you re upgrading and shows the requirements and issues for upgrading to Oracle Database 11g. utlu111s.sql shows the component upgrade status after upgrading to Release 11.1. utlrp.sql recompiles PL/SQL modules such as packages, procedures, and types that are in an invalid state. utluppset.sq performs upgrade actions that don t require you to keep the database in upgrade mode. Following is the list of steps to manually upgrade to Oracle Database 11g: 1. Create a spool file. 2. Log in as a user with the SYSDBA privilege, and run the Pre-Upgrade Information Tool. Make any changes it recommends. 3. Back up the database you re going to upgrade. 4. Copy the current init.ora file to the new Oracle Database 11g init.ora file location. 5. Shut down the database and restart it under the new Oracle 11g home in the STARTUP UPGRADE mode. 6. Create the required Sysaux tablespace. 7. Run the catupgrd.sql upgrade script. 8. Check to see if any objects became invalidated during the database upgrade. 9. Run the utlrp.sql script to recompile any objects that became invalid during the database upgrade. 10. Run the Post-Upgrade Status Tool. 11. End the spool file. 12. Shut down and start up the new database. In the following sections, I explain each of the upgrade actions I listed.

PASSWORD_GRACE_TIME: Sets the time period during which you ll be warned that your password has expired. After the grace period is exhausted, you can t connect to the database with that password. PASSWORD_LOCK_TIME: Specifies the number of days a user will be locked out after reaching the maximum number of unsuccessful login attempts. PASSWORD_REUSE_TIME: Specifies the number of days that must pass before you can reuse the same password. PASSWORD_REUSE_MAX: Determines how many times you need to change your password before you can reuse a particular password. PASSWORD_VERIFY_FUNCTION: Lets you specify your own password-verification function if you don t want to use the default Oracle-provided verification function.

Create a spool file to record the upgrade process so that you can easily review it later. SQL> SPOOL upgrade.log

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