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Applications are developed, tested, and then put into production. A firm usually has development, test, and production versions of the same database in use at any given time, although for smaller companies the test and development versions of the database may be integrated in one database. Development databases are usually owned by the development team, which has full privileges to access and modify data and objects in those databases. The test databases are designed to simulate actual production databases and are used to test the functionality of code after it comes out of the development databases. No new code is usually implemented in the real production databases of the company unless it has been successfully tested in the test databases. When a new application is developed, tested, and put into actual business use (production), the development and production cycle does not end. Application software is always being modified for two reasons: to fix bugs and to improve the functionality of the application. Although most applications go through several layers of testing before they move into production, coding errors and the pressure to meet deadlines contribute to actual errors in software, which are sometimes not caught
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until the application is already in use. In addition, users continually request (or, more appropriately, demand) modifications in the software to improve the application s functionality. Consequently, application code does not remain static; rather, developers and testers are always working on it.
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Your strength as an Oracle DBA is directly related to the amount of effort you put into understanding the conceptual underpinnings of Oracle Database 11g. As you re assimilating the database concepts, it s vital that you implement the various techniques to see if they work as advertised and whether a particular technique is suitable for your organization.
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Tip There s no substitute for hands-on playing with the database. Download the most recent Oracle Database 11g server software, install it, buy some good Oracle DBA books, access the Oracle manuals on Internet sites, and just start experimenting. Create your own small test databases. Destroy them, bring them back to life, but above all have fun. I had great trainers who lived and breathed databases; they made it fun to learn and always had the time to show me new techniques and correct my errors. You ll find database experts willing to share knowledge and skills freely both in the workplace and on the Internet.
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In this section, I discuss the help and services that professional organizations and other resources can provide to enhance your credentials.
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There s no ideal background for an Oracle DBA, but it s highly desirable that one have a real interest in the hardware side of databases, and also have a decent knowledge of operating systems, UNIX and NT servers, and disk and memory issues. It also helps tremendously to have a programming or development background, because you ll be working with developers frequently. The most common operating system for the Oracle database is UNIX, with the Hewlett-Packard (HP) and Sun Microsystems (Sun) versions being the ones commonly adopted. IBM supplies the AIX variant of the UNIX operating system, but it has its own proprietary database, the DB2 Universal Database. If you want to study to become a full-fledged Oracle Database 11g DBA, you need to take these two classes from Oracle or another provider: Oracle Database 11g: Administration Workshop I Oracle Database 11g: Administration Workshop II There are three levels of Oracle certification for DBAs. You must start with the Oracle Certified Associate (OCA) certification first, followed by the Oracle Certified Professional (OCP) certification, which is the most common certification sought by Oracle professionals. The final certification level is the Oracle Certified Master (OCM) certification, which involves a lengthy practical exam over two days. All Oracle Database 11g DBA certification candidates are required to take one in-class or online class from an approved list of courses, in order to meet the new hands-on course requirement. If your firm uses Oracle Real Application Clusters (RAC) or distributed databases, you need to take additional, specialized courses. If your firm uses the UNIX operating system and you don t have experience using it, you may be better off taking a basic class in UNIX (or Linux) from HP, Sun, Red Hat, or another vendor. You don t need to take such a course for Oracle DBA certification purposes, but it sure will help you if you re new to the UNIX or Linux environment. Oracle itself provides several courses in Linux administration and even a certification path for managing Oracle under Linux, under the Oracle Certified Expert Program. Of course, if your databases are going to use the Windows environment, you may get away with not taking a long and formal course in managing
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