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Repeat the same steps we showed here, starting from the Prepare for Upgrade section for every node in the cluster. Once the Clusterware upgrade is complete across all RAC nodes in the cluster, you can confirm that the Oracle Clusterware active version is the same as the software version: crs > crsctl query crs activeversion Oracle Clusterware active version on the cluster is [11.1.0.5.0] rac1.dbaexpert.com:/apps/oracle/general/sh crs > crsctl query crs softwareversion Oracle Clusterware version on node [rac1] is [11.1.0.5.0] The output shows the Oracle Clusterware version for each RAC node.

Use a check integrity constraint to define a SQL check for a column. There are several methods for creating a check constraint. For example, you can define a check constraint when you create a table. The following defines that the ST_FLG column must be either a 0 or a 1: create table emp_id emp_name st_flg ); emp( number, varchar2(30), number(1) CHECK (st_flg in (0,1))

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Adopting new technologies is too often a double-edged sword, making you more efficient and thus providing a competitive advantage while simultaneously introducing uncertainty and potential instability into key production systems Change assurance, which involves making sure major changes such as new software releases and database upgrades don t negatively impact performance, has always been a prime concern for Oracle application developers and database administrators Even if you can simulate real production workloads, the effort is just that a simulation, not the real deal In a world that is technologically advancing at a mindnumbing pace, you need to know which of the technologies have the potential to benefit you; therefore, you need to perform real testing with real data in real conditions Oracle Database 11g places considerable emphasis on the proactive testing of changes by making change assurance one of the cornerstones of the new release.

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A slightly better method is to give the check constraint a name: create table emp_id emp_name st_flg ); emp( number, varchar2(30), number(1) constraint st_flg_chk CHECK (st_flg in (0,1))

It does this through the Real Application Testing feature; this feature encompasses two components, Database Replay and the SQL Performance Analyzer, that dramatically reduce the risks inherent in adopting changes by offering you a realistic method of testing changes using real-life workloads The tools unearth problems and give you the opportunity to fix them before you actually introduce the changes into your production systems Here s a brief summary of the two key components of Real Application Testing in Oracle Database 11g: Database Replay: You can use the Database Replay feature to test the impact of the database upgrade on the production workload by capturing and replaying the production workload on a test system before you actually perform the upgrade on your production database Using the Database Replay reports from a test server, you can fix potential problems before they occur on the production database.

A more descriptive way to name the constraint would be to embed information in the constraint name that actually describes the condition that was violated. For example: CREATE table emp_id emp_name st_flg ); emp( number, varchar2(30), number(1) constraint "st_flg must be 0 or 1" check (st_flg in (0,1))

We discuss the Database Replay feature later in this chapter SQL Performance Analyzer (SPA): You can use the SQL Performance Analyzer to predict the impact of any change, such as an upgrade to a new release, on the SQL workload as captured by a SQL tuning set By knowing ahead of the actual upgrade about any adverse impact on performance and the root cause for it, you can prevent it from actually occurring in a production database after a database upgrade We discuss the SPA later in this chapter In addition to the Database Replay and the SQL Performance Analyzer features, there s also a third new feature pertaining to change management, called SQL Plan Management, which replaces the stored outlines feature in earlier releases The SQL Plan Management feature relies on the use of SQL plan baselines, which represent efficient execution plans.

You can also alter an existing column to include a constraint. The column must not contain any values that violate the constraint being enabled: alter table emp add constraint "st_flg must be 0 or 1" check (st_flg in (0,1));

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