birt code 39

birt code 39

birt code 39

birt code 39

birt code 39

birt code 39,
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birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
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birt code 39,
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birt code 39,

In the database creation example I show later, I use the traditional init.ora file to create the database. Once I create my database, I ll create an SPFILE from this init.ora file. Oracle provides a template to make it easy for you to create your own initialization parameter file. This template is located in the $ORACLE_HOME/dbs directory in UNIX/Linux systems and in the $ORACLE_HOME/database directory in Windows systems. Copy this init.ora template, rename it initdb_name.ora, and then edit it to meet your own site s requirements. Don t be too nervous about trying to make correct estimates for the various configuration parameters, because most of the configuration parameters are easily modifiable throughout the life of the database. Just make sure you re careful about the handful of parameters that you can t change without redoing the entire database from scratch. I point out these parameters in the Important Oracle Database 11g Initialization Parameters section later in this chapter. The interesting thing about the initialization parameter file is that it contains the configuration parameters for memory and some I/O parameters, but not for the database filenames or the tablespaces that the datafiles belong to. The control file holds all that information. The initialization

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file, though, has the locations of the control files and the dump directories for error messages. It also specifies the modes chosen for undo management, the optimizer, and archiving for the redo logs. With the exception of DB_NAME, all Oracle initialization parameters are optional. Oracle will simply use the default values for all the initialization parameters you leave out of the initialization parameter file. Of course, when you let Oracle use default values for a parameter, you relinquish control over that parameter. You should leave parameters out of the init.ora file only if you determine that their default values are okay for your database. In general, it s a good idea to use approximate sizes for the important configuration parameters and use a trial-and-error method to determine whether you need to use parameters that are new or that you haven t used before. Oracle Database 11g is highly configurable, but that benefit also carries with it the need for DBAs to learn not only how the large number of parameters work, but also how they may interact with one another to produce results at variance with your original plans. For example, an increase in the SGA size may increase database performance up to a point, but too big an increase might actually slow the database down, because the operating system might be induced to swap the higher SGA in and out of real memory. Be cautious about making configuration changes; always think through the implications of tinkering with initialization parameters.

You can change the value of any initialization parameter by simply editing the init.ora file. However, for the changes to actually take effect, you have to bounce the database stop it and start it again. As you can imagine, this is not always possible, especially if you are managing a production database. However, you can change several of the parameters on the fly these are called dynamic parameters for that reason. The parameters you can change only by changing the init.ora file and then restarting the database are called static parameters. You have three ways to change the value of dynamic parameters: the ALTER SESSION, ALTER SYSTEM, and ALTER SYSTEM . . . DEFERRED commands.