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commits. This is one reason why many people have a bad habit of committing every statement, instead of processing well-formed transactions consisting of all of the statements needed to take the database from one consistent state to the next. Updates interfere with reads in most other databases. The really bad news in this scenario is that we are making the end user wait for the wrong answer. We still receive an answer that never existed in the database at any point in time, as with the dirty read, but this time we made the user wait for the wrong answer. In the next section, we ll look at what these other databases need to do to achieve read-consistent, correct results. The important lesson here is that various databases executing in the same, apparently safe isolation level can and will return very different answers under the exact same circumstances. It is important to understand that, in Oracle, non-blocking reads are not had at the expense of correct answers. You can have your cake and eat it too, sometimes.

The V$TRANSPORTABLE_PLATFORM view is useful when you re transporting tablespaces across OS platforms. The view tells you whether the endian formats of two OS platforms are compatible or not. 14, which discusses the Data Pump utilities, shows how to use this view for this purpose.

The V$SYSAUX_OCCUPANTS view shows you details about the space usage by each occupant of the SYSAUX tablespace. It also provides you with the move procedure to use for a given occupant, if you want to move the occupant to a different tablespace. Here s a sample query using this view:

Summary

The goal of REPEATABLE READ is to provide an isolation level that gives consistent, correct answers and prevents lost updates. We ll take a look at examples of both, see what we have to do in Oracle to achieve these goals, and examine what happens in other systems.

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SQL> SELECT occupant_name, schema_name, space_usage_kbytes, 2* move_procedure FROM V$SYSAUX_OCCUPANTS; OCCUPANT_NAME SCHEMA_NAME SPACE_USG_KB MOVE_PROCEDURE ------------------------------------------------------------------LOGMNR SYSTEM 7488 SYS.DBMS_LOGMNR_D.SET_TABLESPACE . . . ULTRASEARCH WKSYS 7296 MOVE_WK 20 rows selected. SQL> If you wish to move the SYSAUX occupant ULTRASEARCH to a new tablespace called ULTRA1, you can do so using the MOVE_WK procedure owned by the WKSYS schema, as shown here: SQL> EXECUTE WKSYS.MOVE_WK('ULTRA1'); This chapter introduced you to several useful data dictionary views that help you manage the database. Although using the OEM Database Control reduces the need to use most of these views on a frequent basis, it s important to master the contents of these views, so you know where the database stores important information.

racle supplies a large number of PL/SQL packages that help both developers and DBAs extend database functionality. This chapter focuses on the packages that DBAs can use to manage the database. Oracle implements most of its special features with these PL/SQL packages, and the number of Oracle-supplied PL/SQL packages is growing with each version of the software. Several packages are available for you to use to manage routine database tasks, and you need other packages only occasionally to perform special tasks. Some specialized packages, such as UTL_FILE and UTL_SMTP , enable you to perform some tasks easily, such as reading operating system files or sending pages without having to write lengthy pieces of code. You ll begin with an overview of the Oracle-supplied packages. You ll then review the key PL/SQL packages in detail, including examples of their use. Don t be intimidated by the many procedures and functions that are part of most of these packages. In most cases, you ll probably need to use just a couple of the key procedures to perform a task.

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