Beginning Oracle Database 11g Administration From Novice to Professional

CHAPTER 16 INSTANCE TUNING 375
Using the Statspack Report
A Statspack report is generated from two snapshots of the database. These snapshots are
a copy of the contents of the various dynamic performance tables that are continuously
accumulating information about activity in the database. Automatic Workload Repository
(AWR) and Automatic Database Diagnostic Monitor (ADDM) were offered as replacements
for Statspack beginning with Oracle Database 10g and are no longer documented
in the Oracle manuals. However, you can use AWR and ADDM only with Enterprise Edition
and only if you have a license for Diagnostics Pack—an extra-cost option available
only with Enterprise Edition. In my experiences, very few organizations have the requisite
licenses. I therefore emphasize the use of Statspack and use it a lot in my own work. Note
that Oracle did make several incremental enhancements to Statspack in Oracle Database
10g and 11g, thus further increasing its usefulness and relevance. However, you will have
to refer to Chapter 21 of Oracle Database 9i Performance Tuning Guide and Reference for