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The database compatibility level is set by the value of the COMPATIBLE initialization parameter the compatibility level specifies the release with which the database must remain compatible. This is important because the COMPATIBLE parameter helps you guarantee backward compatibility with an earlier release. The parameter s default value in Oracle Database 11g Release 1 is 11.0.0.0, and the minimum value is 10.0.0. When you are upgrading to Oracle Database 11g, and you set the COMPATIBLE parameter to 10.0.0, it means that you can undo the changes made by the upgrade process and go back to the older release if the upgrade doesn t pan out. Otherwise, the only way to go back to the older release is to restore from a backup. Oracle recommends that you set the COMPATIBLE parameter to 10.0.0 before you upgrade to Oracle Database 11g, which ensures that you can always revert to the Oracle Database 10g release if necessary. However, the price you pay for this convenience is that you can only use a limited subset of the new Oracle Database 11g features. After you ve upgraded your database and are sure that you want to continue further, you can set the COMPATIBLE initialization parameter in your SPFILE to match the new release number (11.1.0).

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The Post-Upgrade Status Tool provides you with the following information: The name and status (VALID or INVALID) of each database component The version compatibility of the component with the current database version Suggestions for corrective action if it finds invalid components (such as the names of appropriate scripts to run) The Post-Upgrade Status Tool is also a SQL script, called utlu111s.sql and located in the $ORACLE_HOME/rdbms/admin directory. While manual upgrades are easy, the burden of due diligence is on you, and you can lose a lot of time if you make any mistakes.

Which of the two upgrade methods (DBUA or manual upgrade) is superior The underlying scripts and upgrade procedures are identical for both methods choose the method you re most comfortable with.

Idle()

Before you upgrade to Oracle Database 11g, you must be aware of the following changes concerning privileges, timestamps, and the Oracle Database Vault.

In Oracle Database 11g, the CONNECT role has only the CREATE SESSION privilege and nothing else. In previous versions, the CONNECT role had other privileges, which are automatically revoked during an upgrade to Oracle Database 10g. If you think any of the users with the CONNECT role in the previous release need the privileges that used to be a part of the CONNECT role, you must grant the specific required privileges prior to upgrading to Oracle Database 11g.

If the time zone versions used by the Oracle Database 11g server and the database that s being upgraded are different, the upgrade will fail. To avoid this, you must first update the existing database to time zone file version 4 (path 5632264 TZ v4 FILE).

Response()

You must disable the Oracle Database Vault before upgrading the database, in case you ve enabled it.

The DBUA combines the work of the Pre-Upgrade Information Tool and the manual upgrade process. The DBUA performs the following pre-upgrade steps automatically: Sets ORACLE_HOME to the new Oracle Database 11g locations. Changes the oratab file entries to the new location. Copies your current init.ora file to the new Oracle Database 11g default init.ora location ($ORACLE_HOME/dbs in UNIX and Linux systems). Checks that your tablespaces have adequate space before the upgrade process begins. These checks also cover the undo tablespace and the rollback segments. Checks for unsupported character sets and invalid data types and usernames, and so on. Performs backups, if you choose. Updates obsolete initialization parameters. Configures the database with the Enterprise Manager, if you choose. Writes detailed trace and log files, as well as showing the upgrade progress. The DBUA can upgrade not only a single instance configuration, but also Oracle Real Application Clusters and standby database configurations as well.

Start the DBUA by simply typing dbua at the operating system prompt. You have to log in as the oracle user first. On a Windows server, you start the DBUA tool by going to Start All Programs Oracle Configuration and Migration Tools Database Upgrade Assistant. As mentioned previously, you can do a silent upgrade using the DBUA if you don t want to use the GUI. This means you won t see any prompts when you invoke the DBUA.

Create()