The current database system is more popular

If you are going to be a DBA, it is recommended that you choose a database system that is now more popular. This means that you will have more opportunities for employment, communication and training, and that there are popular reasons why you can worry a lot. Of course, the employment competition pressure is also relatively big. The average beginner chooses Microsoft SQL Server, a database system that is ideal for small and midsize enterprises, and readers who are familiar with access can easily become a DBBS by using Microsoft SQL Server initially. Microsoft SQL Server 7.0 quotes, 5 user version 1399 USD, increase user, 127 USD per user.

Oracle

If you have access to Oracle, that's a good chance. Oracle is currently the most promising database manufacturer, because of its powerful capabilities and configurable, manageable, Oracle DBA salaries are generally higher than other database administrators. Moreover, Oracle's key applications in large and medium-sized enterprises are more common. Oracle can run on platforms such as Windows NT, Sun Solaris, Linux, and so on. In many cases, you are not only familiar with NT, but you are also familiar with UNIX, and Oracle's unfriendly interface and box of Oracle product data can also be a hindrance.

Oracle 8i Standard Quote, if run in Windows NT, with Jserver and intermedia, support 5 concurrent users, quote 3925 USD per CPU. When adding concurrent users, 785 dollars per user. Add additional named users when 392.5 dollars per user.

IBM UDB/DB2

As a result of the 30 database research, IBM DB2 really called "the aristocracy of the database system". Whether it's a small business system or a big banking system, it's safe to use DB2. Recently introduced new DB2 6.1, management and adjustment tools are more outstanding and easy to use. DB2 can run on the Intel architecture or run on IBM's s/390 mainframe computers. If your industry is particularly praised for IBM machines, it is recommended that you learn IBM DB2.

There are two versions of DB2: Workgroup Edition and Enterprise Edition. Workgroup Edition 999 USD per server, plus 249 USD per concurrent user. And the Enterprise version is 12500 dollars per CPU, unlimited number of concurrent users.

Java-centric Database-sybase adaptive Server Enterprise (ASE) 12.0

The upcoming Sybase ASE 12.0 is directed toward Java programmers. This Java-centric database system is the best choice for businesses that are ready to build enterprise applications under the Java platform. But ASE is not a leader in the database field, although it has improved a lot compared to its previous version, and supports multiple CPUs and more concurrency, and there are many new features. But Sybase's scenery seems to have ceased.

Informix Centaur

Informix is one of the first large database vendors to add multimedia features to relational database systems. But today, IBM, Oracle, and Sybase have all crossed the concept. So Informix has to look for new support to differentiate itself from other database vendors. This is the goal of Informix Centaur.