TAILIEUCHUNG - OCA/OCP Oracle Database 11g All-in-One Exam GOCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P16uide 106 Certain parameters affect the entire system,

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P16:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 106 Certain parameters affect the entire system individual sessions or both. An example of a parameter that applies to the whole instance but can also be adjusted for individual sessions is OPTIMIZER_MODE. This influences the way in which Oracle will execute statements. A common choice is between the values ALL_ROWS and FIRST_ROWS. ALL_ROWS instructs the optimizer to generate execution plans that will run the statement to completion as quickly as possible whereas FIRST_ROWS instructs it to generate plans that will get something back to the user as soon as possible even if the complete execution of the statement ultimately takes longer to complete. So if your database is usually used for long DSS-type queries but some users use it for interactive work you might issue the command alter system set optimizer_mode all_rows and let those individual users issue alter session set optimizer_mode first_rows There are a few parameters that can only be modified at the session level. Principal among these is NLS_DATE_FORMAT. This parameter which controls the display of date and time values can be specified in the parameter file but cannot be changed with ALTER SYSTEM. So it is static as far as the instance is concerned. But it can be adjusted at the session level alter session set nls_date_format dd-mm-yy hh24 mi ss This will change the current session s date time display to the European norm without affecting any other sessions. Exercise 3-1 Query and Set Initialization Parameters In this exercise use either SQL Plus or SQL Developer to manage initialization parameters. 1. Connect to the database which must be open as user SYS with the SYSDBA privilege. Use either operating system authentication or password file authentication. 2. Display all the basic parameters checking whether they have all been set or are still on default select name value isdefault from v parameter where isbasic TRUE order by name 3. Any basic parameters .

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