By Thomas Kyte
Tom Kyte has an easy philosophy: you could deal with Oracle as a black field and simply stick information into it otherwise you can know the way it really works and take advantage of it as a robust computing surroundings. if you happen to pick out the latter path, you then will locate that there are few details administration difficulties that you simply can't resolve fast and elegantly.Tom has chosen an important beneficial properties and strategies and he teaches them in a proof-by-example demeanour, not just discussing the positive aspects on hand, but in addition how one can enforce software program utilizing them and indicating the aptitude pitfalls.This ebook covers:Core database buildings and utilitiesPerformance tuningAdvanced SQL featuresExtensibility utilizing C, Java and OR featuresSecurityImportant provided programs
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You will only achieve this by fixing the application - perhaps by making it do significantly less I/O. Performance is something you have to design for, to build to, and to test for continuously throughout the development phase. It should never be something to be considered after the fact. I am amazed at how many times people wait until the application has been shipped to their customer, put in place and is actually running before they even start to tune it. I've seen implementations where applications are shipped with nothing more than primary keys - no other indexes whatsoever.
Oracle Corporation for example uses this technique in the development of its own database. There is a large amount of code (a small percentage of the database code overall) called OSD (Operating System Dependent) code that is implemented specifically for each platform. Using this layer of abstraction, Oracle is able to make use of many native OS features for performance and integration, without having to rewrite the large majority of the database itself. The fact that Oracle can run as a multi-threaded application on Windows and a multi-process application on UNIX attests to this feature.
Ora. Without a parameter file, you cannot start an Oracle database. This makes this a fairly important file. However, since it is simply a plain text file, which you can create with any text editor, it is not a file you have to guard with your life. For those of you unfamiliar with the term SID or ORACLE_SID, a full definition is called for. The SID is a site identifier. It and ORACLE_HOME (where the Oracle software is installed) are hashed together in UNIX to create a unique key name for attaching an SGA.