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USERS SQL> You can create a default permanent tablespace when you first create a database, as shown here: CREATE DATABASE DATAFILE '/u01/app/oracle/test/system01.dbf' SIZE 500M SYSAUX DATAFILE '/u01/app/oracle/syaux01.dbf' SIZE 500M DEFAULT TABLESPACE users DATAFILE '/u01/app/oracle/users01.dbf' SIZE 250M . . . The previous CREATE DATABASE statement results in the creation of a default permanent tablespace named users, created by using the DEFAULT TABLESPACE clause (shown in the last two lines of the statement).

Oracle uses the OFA standards in creating filenames, so filenames are unique and datafiles are easily identifiable as belonging to a certain tablespace. Table 17-1 shows the naming convention for various kinds of OMF files and an example of each type. Note that the letter t stands for a unique tablespace name, g stands for an online redo group, and u is an 8-character string.

As mentioned above, CORBA notifications have a header containing properties. Some of these properties have standard names and are used to support QoS options. Of all the Notification Services in current use, CORBA probably defines the greatest number of QoS features. It supports the following features: Reliability: This option determines the reliability of notification delivery. Two settings are possible: transient and persistent. If the event channel fails before delivering a notification with transient reliability, that notification will be lost. Notifications using persistent reliability are kept in a local store by the Notification Service and can be recovered after a failure and delivered. Priority: Notifications can be assigned a priority value. Priorities are significant only if notifications can t be delivered as fast as they are generated. For example, using push delivery, the event channel delivers notifications as soon as they are received, regardless of their priority. If notifications arrive faster than they can be delivered, the event channel uses the notification priority to determine the delivery order of buffered notifications.

Datafile Temp file (default size is 100MB) Online redo log file (default size is 100MB) Control file

You can use OMF to create all three types of files that the Oracle database requires: control files, redo log files, and, of course, datafiles. However, there are interesting differences in the way OMF requires you to specify (or not specify) each of these types of files. The following sections cover how Oracle creates the three different types of files.

As you have probably noticed already, there is no specific parameter that you need to include in your init.ora file to specify the OMF format. If you specify the CONTROL_FILES parameter, you will, of course, have to specify a complete file location for those files, and obviously they will not be OMF files they are managed by you. If you don t specify the CONTROL_FILES parameter, and you use the DB_CREATE_ FILE_DEST or the DB_CREATE_ONLINE_LOG_DEST_n parameter, your control files will be OMF files. If you are using a traditional init.ora file, you need to add the control file locations to it. If you are using an SPFILE, Oracle automatically adds the control file information to it.

Timing: The supplier can constrain the timing of delivery by giving the earliest delivery time, the latest delivery time, or a timeout value In the first case, the event channel will buffer the notification When the specified time arrives, the channel will attempt to deliver the notification When the latest time is specified, the channel will try to delivery the notification immediately, and discard the notification when the deadline occurs Timeout constraints are similar, except they indicate the amount of time the channel has to complete delivery Queue sizes: The event channel administrator can specify the size of queues used to store notifications in transit Queue sizes affect two things: the total number of queued notifications in the channel, and the maximum number of queued notifications allowed for a particular consumer Delivery order: When notifications get queued, the delivery order indicates in which order to deliver them.

OMF redo log file creation is similar to control file creation. If you don t specify a location for the redo log files, and you set either of the DB_CREATE_FILE_DEST or the DB_CREATE_ONLINE_LOG_DEST_n parameters in the init.ora file, Oracle automatically creates OMF-based redo log files.