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From the Oracle Database 11g Release 1 (11.1) environment, run the catupgrd.sql script (found in the $ORACLE_HOME/rdbms/admin directory). This script automatically runs the appropriate upgrade script for the database version you re upgrading and uses procedures from the DBMS_REGISTRY package to execute various component upgrades. Make sure you re logged in as a user with SYSDBA privileges, and run the upgrade script from the new environment: SQL> @$ORACLE_HOME/rdbms/admin/catupgrd.sql The catupgrd.sql script creates and alters certain data dictionary tables and upgrades or installs several database components in the new database.

Remove() Response()

After the catupgd.sql script finishes executing, you must run the new upgrade script called catuppset.sql to perform upgrade actions that don t require the database to be in upgrade mode. SQL> @$ORACLE_HOME/rdbms/admin/catuppst.sql You can run the catuppst.sql script simultaneously with the catupgd.sql script in a different SQL*Plus session.

Restart the instance to reinitialize the system parameters. The restart ensures that all caches and buffers are cleared and ensures the integrity and consistency of the newly upgraded database.

Execute the new upgrade script catuppset.sql to perform the remaining upgrade actions that don t require you to run the database in upgrade mode. SQL> @catuppset.sql You can run the catuppset.sql script simultaneously with the catupgd.sql script to save time.

When a connection is made to a remote server, the connection is kept in a pool. Subsequent requests directed to the same host reuse the connection. Once a connection is used, it may not be needed again. Since you don t want to keep idle connections open indefinitely, keep track of when a connection was last used. If the connection isn t used for a certain amount of time, close it and remove it from the pool. Use a background thread to check the pool periodically for idle connections. The activity diagram in Figure 12-7 shows the basic operations of the connection pool system.

Oracle will create, drop, and alter some database objects as the upgrade process progresses, thus invalidating some internal Oracle packages and procedures. After the upgrade script has finished, you need to check for invalid objects: SQL> SELECT count(*) FROM DBA_OBJECTS WHERE status = 'INVALID';

By running the Oracle-provided utlrp.sql script, you can do a recompilation and validation of all the objects invalidated during the upgrade process. During this process, utlrp.sql calls utlprp.sql (a wrapper based on the UTL_RECOMP package). Note that Oracle will dynamically compile each of the invalidated objects when they are accessed if you don t do it now. However, this runtime compilation of invalidated objects could slow down your database s performance. You can recompile all invalidated Oracle database objects using the utlrp.sql script: SQL> @$ORACLE_HOME/rdbms/admin/utlrp.sql . . . PL/SQL procedure successfully completed. TIMESTAMP ----------------------------------------------COMP_TIMESTAMP UTLRP_END 2008-2-21 15:20:49 PL/SQL procedure successfully completed. SQL> To check that there aren t any invalid objects left, you should run the check again: SQL> SELECT count(*) FROM dba_objects WHERE status = 'INVALID';

Figure 12-7. Managing the connection pool When you create CoordinatorConnectionPool, you instantiate a ConnectionPool and create a separate thread to check for idle connections. This thread runs for the whole life of the system. Figure 12-8 shows the class diagram of the connection pool system.

COUNT(*) --------------0 1 row selected. SQL> Once it has validated all the invalid objects, the utlrp.sql script validates each individual component in the database and updates the DBMS_SERVER_REGISTRY view.

You can revert to the older database as long as you have a backup of the database made before starting the upgrade process. It s vital to have a backup, since the upgrade process may fail before it s completed, leaving you with a database that won t be functional under the pre- or post-upgrade version of Oracle.