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In this chapter you will learn to 05241 Set Database Initialization Parameters 05242 Describe the Stages of Database Startup and Shutdown 05243 Use Alert Log and Trace Files 05244 Use Data Dictionary and Dynamic Performance Views

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You should now have a database installed on your learning environment and be ready to investigate and demystify your Oracle instance There are many benefits to learning in a playpen environment, the most important of which is that as you experiment and explore you will inevitably make a mistake, and the authors find that resolving such mistakes provides the best opportunity for learning You could always deinstall and reinstall the software if you believe you have damaged it irreparably, but even such a nonheroic solution still provides valuable OUI experience The database and instance are governed by a set of initialization parameters There are a vast number of them, of which only about 33 are really important to know These parameters determine settings like the amount of memory your instance will request the operating system to allocate at instance startup time, the location of the controlfiles and redo logfiles, and the database name The default parameter values won t suit most production environments, but they are general enough to acceptably run your learning environment Many DBAs are slightly afraid of modifying these parameters, but there is nothing scary here, just a bunch of settings that once configured hardly ever change If you change them during the course of a performance tuning exercise, or while trying to multiplex your controlfiles, and the database behaves worse, it is a simple matter to revert your changes These initialization settings are stored in a parameter file without which your instance will not start The stages of database startup and shutdown will be examined, and although they are quite simple, these fundamental stages have important implications for understanding how the mechanism for instance crash recovery operates and how some of the instance background processes interact with the database The value provided by alert log and trace files cannot be overemphasized when problems arise, and Oracle has contrived a convenient set of initialization parameters used to quickly locate the relevant files This is especially useful when high-powered company executives are intently watching you resolve problems after your company s production database has just decided to go for a loop The alert log file is probably the most important file to a DBA, as it contains a living record of the critical events that occur on your instance, recording events like startups, shutdowns, and serious error conditions The trace files are usually generated by background and server processes and, just like the alert log file, provide a mixture of informational and error messaging Familiarity with these files is vital and will be discussed The chapter closes with a discussion of the database dictionary and the dynamic performance views These objects are interrogated by SQL queries and provide vital information on the current state of your system One of the authors once had a manager who insisted that all DBA support staff memorize the data dictionary objects And they did Thankfully, the manager left when Oracle 7 was the current version The Oracle 11g dictionary is significantly larger and can be intimidating, but fortunately, you do not have to memorize the plethora of information available Knowing the nature of the information available is, however, important and very useful The data available in the dynamic performance views will not persist across instance shutdown and startup cycles These views report on the current database activity and help both the instance and the DBA keep abreast of the happenings in the system Using and befriending these objects will greatly simplify your task of understanding what the database is really about.