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If you have multiple undo tablespaces in your database, however, you must specify which undo tablespace you want the database to use, by specifying the UNDO_TABLESPACE parameter in the initialization parameter file. You can have multiple tablespaces in your database, but only one of them can be active at any given time. You activate an undo tablespace by using the ALTER SYSTEM SET UNDO_TABLESPACE command, which you ll see shortly. You create an undo tablespace when you create your database. The following database creation statement shows how to create the undo tablespace during database creation: SQL> CREATE DATABASE cust_prod ... UNDO TABLESPACE undotbs_01 datafile DATAFILE '/u10/orcl/oradata/undotbs01_01.dbf' size 750M; ...

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I also explain the creation of the undo tablespace in 9, which deals with creating an Oracle database.

After each file has been edited, we want to see how the script was called to determine whether it needs to be checked back in. Recall that a soft link to the script was created when the script was installed. If the script was called with this vir soft link instead of with a vi/vim command, which we can find out by examining $ME, then we can assume that even if the file was not under RCS control before, it needs to be checked in so it will be available in the future. The script checks to see if the RCS-controlled version of the file exists. If the controlled version does not exist, the script checks the file into the RCS with the initial check-in (-i) switch; otherwise it checks it in as normal.

You may choose not to create the undo tablespace when you create a new database, and even if you create an undo tablespace at database creation time, you may choose to add another undo tablespace later on. Creating an undo tablespace is like creating any other tablespace, except that you use the keyword UNDO in the CREATE TABLESPACE statement. To create an undo tablespace by itself, in an existing database, use this statement: SQL> CREATE UNDO TABLESPACE undotbs_02 DATAFILE 'c:\oracle10g\oradata\finance\undotbs01_01.dbf' SIZE 500M; Tablespace created. SQL> You can add space to an existing undo tablespace by using the ALTER TABLESPACE statement, as shown here: SQL> ALTER TABLESPACE undotbs_01 ADD DATAFILE '/u09/oradata/test/undo01dbf' 500M; You can create several undo tablespaces for your database, but the instance can only use a single undo tablespace at any given time. Let s say you are using the undo tablespace undotbs_01 as your current undo tablespace. The following ALTER SYSTEM SQL statement will dynamically change the undo tablespace for your database: SQL> ALTER SYSTEM SET UNDO_TABLESPACE = undotbs_02;

In this section you ll briefly review the important Oracle features that facilitate object-oriented programming. Abstract types, also called object types, are at the heart of Oracle s object-oriented programming. Unlike a normal data type, an abstract data type contains a data structure along with the functions and procedures needed to manipulate the data; thus, data and behavior are coupled. Object types are like other schema objects, and they consist of a name, attributes, and methods. Object types are similar to the concept of classes in C++ and Java. Oracle support for object-oriented features, such as types, makes it feasible to implement object-oriented features, such as encapsulation and abstraction, while modeling complex real-life objects and processes. Oracle also supports single inheritance of user-defined SQL types.

No, unless you produce a mixed-code assembly, because of other linker inputs that were compiled with /clr or to native code Yes, unless you produce a mixed-code EXE No, unless you produce a mixed-code assembly No

Object types are created by users and stored in the database like Oracle data types such as VARCHAR2, for example. The CREATE TYPE command lets you create an abstract template that corresponds to a real-world object. Here s an example: SQL> 2 3 4 Type SQL> CREATE TYPE person AS object (name varchar2(30), phone varchar2(20)) / created.

Object tables contain objects such as the person type that was created in the previous section. Here s an example: SQL> CREATE TABLE person_table OF person; Table created. SQL> Here s the interesting part. The person_table table doesn t contain single value columns like a regular Oracle table its columns are types, which can hold multiple values. You can use object tables to view the data as a single-column table or a multicolumn table that consists of the components of the object type. Here s how you would insert data into an object table: SQL> INSERT INTO person_table 2 VALUES 3 ('john smith', '1-800-555-9999'); 1 row created. SQL>

if [ "$ME" = "vir" ] then $TEST ! -f "$PATH/RCS/$FILENAME,v" -o ! -f "$PATH/$FILENAME,v" && $CI -i $file else $TEST -f "$PATH/RCS/$FILENAME,v" -o -f "$PATH/$FILENAME,v" && $CI -u $file fi done