Beginning Oracle Database 11g Administration From Novice to Professional

CHAPTER 17 SQL TUNING 391
are the procedures. They can
be used to customize how the collects statistics. The available
options are similar to those of the procedures.
Caution One class of statistics that is not collected automatically is the system statistics; an example is
, the time taken to read one random block from disk. System statistics must be collected manually
by using the procedure. For details, refer to Oracle Database 11g PL/SQL Packages
and Types Reference.
Tuning by Example
Let’s experience the process of tuning an SQL statement by creating two tables,
and , modeled after and , two dictionary views. Every
record in describes one table, and every record in describes one
index. The exercise is to print the details (, , and ) of tables
that have at least one bitmap index.
Note that you will need the and privileges for this
exercise. You may need the help of your database administrator or you may need to use
your own Oracle database on your laptop or PC.
Creating and Populating the Tables
Create and populate the two tables as follows. When I performed the experiment, 1,574
rows of information were inserted into , and 1,924 rows of information were
inserted into .