DEVELOPING SUCCESSFUL ORACLE APPLICATIONS in Objective-C

Paint Data Matrix in Objective-C DEVELOPING SUCCESSFUL ORACLE APPLICATIONS

CHAPTER 1 DEVELOPING SUCCESSFUL ORACLE APPLICATIONS
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object implementations as well) is the database itself. The front ends to the data change almost yearly, and as they do, the applications that have all of the security built inside themselves, not in the database, become obstacles, roadblocks to future progress. The Oracle database provides a feature called fine-grained access control (FGAC). In a nutshell, this technology allows developers to embed procedures in the database that can modify queries as they are submitted to the database. This query modification is used to restrict the rows the client will receive or modify. The procedure can look at who is running the query, when they are running the query, what application is requesting the data, what terminal they are running the query from, and so on, and can constrain access to the data as appropriate. With FGAC, we can enforce security such that, for example: Any query executed outside of normal business hours by a certain class of users returns zero records. Any data can be returned to a terminal in a secure facility but only non-sensitive information can be returned to a remote client terminal.
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Basically, FGAC allows us to locate access control in the database, right next to the data. It no longer matters if the user comes at the data from a bean, a JSP, a Visual Basic application using ODBC, or SQL*PLUS the same security protocols will be enforced. You are well-situated for the next technology that comes along. Now I ask you, which implementation is more open The one that makes all access to the data possible only through calls to the Visual Basic code and ActiveX controls (replace Visual Basic with Java and ActiveX with EJB if you like I m not picking on a particular technology but an implementation here) or the solution that allows access from anything that can talk to the database, over protocols as diverse as SSL, HTTP, and Oracle Net (and others) or using APIs such as ODBC, JDBC, OCI, and so on I have yet to see an ad hoc reporting tool that will query your Visual Basic code. I know of dozens that can do SQL, though. The decision to strive for database independence and total openness is one that people are absolutely free to take, and many try, but I believe it is the wrong decision. No matter what database you are using, you should exploit it fully, squeezing every last bit of functionality you can out of that product. You ll find yourself doing that in the tuning phase (which again always seems to happen right after deployment) anyway. It is amazing how quickly the database independence requirement can be dropped when you can make the application run five times faster just by exploiting the software s capabilities.
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How Do I Make It Run Faster
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The question in the heading is one I get asked all the time. Everyone is looking for the fast = true switch, assuming database tuning means that you tune the database. In fact, it is my experience that more than 80 percent (frequently 100 percent) of all performance gains are to be realized at the application design and implementation level not the database level. You can t tune a database until you have tuned the applications that run on the database. As time goes on, there are some switches we can throw at the database level to help lessen the impact of egregious programming blunders. For example, Oracle 8.1.6 added a new parameter, CURSOR_SHARING=FORCE. This feature implements an auto binder, if you will. It will silently take a query written as SELECT * FROM EMP WHERE EMPNO = 1234 and rewrite it for us as SELECT * FROM EMP WHERE EMPNO = :x. This can dramatically decrease the number of hard parses, and decrease the library latch waits we discussed in the Architecture sections but (there is always a but) it can have some side effects. A common side effect with cursor sharing is something like this:
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