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Given the diverse nature of business, a DBA s job description is not exactly the same in all organizations There are several variations in the job s classification and duties across organizations In a small firm, a single DBA might be the UNIX or Windows administrator and the network administrator as well as the Oracle DBA, with all job functions rolled into one A large company might have a dozen or more Oracle DBAs, each in charge of a certain database or a certain set of tasks Sometimes you ll hear the terms production DBA and development (or logical ) DBA Production DBA refers to database administrators in charge of production databases Because a production database is already in production (meaning it is already serving the business functions), such DBAs aren t required to have design or other such developmental skills.

DBAs who are involved in the preproduction design and development of databases are usually called development or logical DBAs Ideally, you should strive to acquire the relevant skill sets for both development and production administration, but reality demands that you usually are doing more of one thing than the other at any given time In general, large establishments usually have a number of DBAs and can afford to assign specialized tasks to their personnel If you work for a small organization, chances are you ll be doing a little bit of everything Individual preference, the availability of financial and technical resources, and the necessary skill sets determine whether a DBA is doing production or development work A DBA who comes up from the developer ranks or who s happiest coding is usually more likely to be a development or logical DBA.

In C#, you can use the += operator to bind a delegate to a new handler, without removing other handlers already in the delegate s invocation list. Similarly, you can use the -= operator to remove a method reference from a delegate. Here are a couple C# examples:

This same person also may not really want to carry a pager day and night and be woken up in the dead of night to perform a database recovery On the other hand, a person who likes to do production work and to work with business analysts to understand their needs is less likely to enjoy programming in SQL or in any other language Although all of the preceding is true, both development and production DBAs are well advised to cross-train and learn aspects of the other side of Oracle database administration Too often, people who characterize themselves as production DBAs do not do much beyond performing backups and restores and implementing the physical layout of databases.

Similarly, development DBAs, due to their preference for the programming and design aspects of the job, may not be fully cognizant of the operational aspects of database management, such as storage and memory requirements..

In many organizations, you will be working with different types of databases daily, and thus with different types of data and management requirements. You may find yourself working on simple SQL queries with users and simultaneously wrestling with decision-support systems for management. Databases perform a variety of functions, but you can group all of those functions into two broad categories: online transaction processing (OLTP) and decision-support systems (DSSs; sometimes also called online analytical processing, or OLAP). Let s take a quick look at some of the basic classifications of Oracle databases.