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CHAPTER 4 INTRODUCTION TO THE ORACLE DATABASE 10G ARCHITECTURE
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Quite often, you may be called upon to help recover from a logical corruption of the database, rather than from a hardware failure. You can use the following flashback techniques in Oracle Database 10g to recover from logical errors: Flashback Database: Takes the entire database back to a specific point in time Flashback Table: Returns individual tables to a past state Flashback Drop: Undoes a DROP TABLE command and recovers the dropped table Flashback Query, Flashback Version Query, and Flashback Transaction Query: Retrieve data from a time (or interval) in the past The Flashback Database and Flashback Drop features are discussed in 16, which deals with recovery techniques. The Flashback Table, Flashback Query, Flashback Version Query, and Flashback Transaction Query features rely on undo data, and are covered in 6.
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The Oracle Data Dictionary and the Dynamic Performance Views
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Oracle provides a huge number of internal tables to aid you in tracking changes to database objects and to fix problems that will occur from time to time. Mastering these key internal tables is vital if you want to become a savvy Oracle DBA. All the GUI tools, such as OEM, depend on these key internal tables (and views) to gather information for monitoring Oracle databases. Although you may want to rely on GUI tools to perform your database administration tasks, it is important to learn as much as you can about these internal tables. Knowledge of these tables helps you understand what is actually happening within the database. You can divide the internal tables into two broad types: the static data dictionary tables and the dynamic performance tables. You won t access these tables directly; rather, you ll access the information through views based on these tables. 23 is dedicated to a discussion of these views, and you can get a complete list of all the data dictionary views by issuing the following simple query: SQL> SELECT * FROM dict; The following sections examine the role of these two important types of tables (and views).
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The Oracle Data Dictionary
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Oracle maintains a set of tables within the database called the data dictionary. You access these read-only data dictionary tables through views built on them. Views are like logical tables built on an underlying Oracle table, and I discuss them in detail in 5. The data that the data dictionary maintains is also known as metadata. DBAs and developers depend heavily on the data dictionary for information about the various components of the database these tables contain information such as the list of tables, table columns, users, user privileges, file and tablespace names, and so on. A simple query, such as the following, necessitates several calls to the data dictionary before Oracle can execute it: SQL> SELECT employee_name FROM emp WHERE city = 'NEW YORK'; It s important to note that the data dictionary tables don t report on aspects of the running instance. The data dictionary holds only information about the database, such as the database files,
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CHAPTER 4 INTRODUCTION TO THE ORACLE DATABASE 10G ARCHITECTURE
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tables, functions, and procedures, as well as user-related information. Another set of views, called the dynamic performance views, records information about the currently running instance.
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The data dictionary tables describe the entire database: its logical and physical structure, its space usage, Tip its objects and their constraints, and user information. You can t access the data dictionary tables directly; instead, you re given access to views built on them. You also can t change any of the information in the data dictionary tables yourself. Only Oracle has the capability to change data in the data dictionary tables. When you issue a query involving the CITIES column in a table named EMPLOYEES, for example, the database will consult various data dictionary tables to verify that the table and the column exist, and to confirm that the user has the rights to execute that statement. As you can imagine, a heavily used OLTP database will require numerous queries on its data dictionary tables during the course of a day.
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The Oracle super user SYS owns most of the data dictionary tables (though some are created under the system username), and they are stored in the System tablespace.
Oracle recommends that you analyze both the data dictionary and the dynamic performance tables (also Tip referred to as fixed tables) on a regular basis to improve performance. 21 shows you how to analyze these tables.
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