Expert Oracle Database Architecture: Oracle Database 9i, by Thomas Kyte

By Thomas Kyte

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Extra info for Expert Oracle Database Architecture: Oracle Database 9i, 10g, and 11g Programming Techniques and Solutions, Second Edition

Sample text

Use a Single Connection in Oracle Now, in SQL Server it is a very common practice to open a connection to the database for each concurrent statement you want to execute. If you are going to do five queries, you might well see five connections in SQL Server. In Oracle, on the other hand, if you want to do five queries or five hundred, the maximum number of connections you want to open is one. So, a practice that is common in SQL Server is something that is not only not encouraged in Oracle, it is actively discouraged; having multiple connections to the database is just something you don’t want to do.

However, I can write bad code that does not scale in Oracle as easily—if not more easily—as I can write good, scalable code in Oracle. You can replace Oracle with any piece of software and the same is true. This is a fact: it is easier to write applications that perform poorly than it is to write applications that perform well. It is sometimes too easy to build a single-user system in the world’s most scalable database if you don’t know what you are doing. The database is a tool and the improper use of any tool can lead to disaster.

You’ll find no other language so tightly coupled with SQL, nor any as optimized to interact with SQL. Working with SQL in PL/SQL is a very natural thing—whereas in virtually every other language from Visual Basic to Java, using SQL can feel cumbersome. It never quite feels “natural”— it’s not an extension of the language itself. When PL/SQL runs out of steam—which is exceedingly rare today with current database releases—we’ll use Java. Occasionally, we’ll do something in C, but typically only when C is the only choice, or when the raw speed offered by C is required.

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