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OCP Instructors Guide for Oracle DBA Certification

Chapter 7 - Tuning and Performance

Segment-Level Performance Statistics Collection

When investigating performance problems, administrators would use the system-wide statistics contained in the V$ views to review performance indicators at the instance level.  Segment-level performance statistics can then be used to focus on the specific tables and indexes that may be causing the problem.  

Statistics are captured by setting the statistics_level dynamic initialization parameter to TRUE (default) or ALL.  Although a small section of the SGA is allocated to capture this information, there is no significant impact on database performance.

Three new dynamic performance views are introduced in Oracle 9i Release 2:

  • v$segstat_name  – lists the segment statistics collected

  • v$segstat  – real time monitoring view of segment-level statistics

  • v$segment_statistics  – contains all of the information in v$segstat plus segment owner, tablespace name, etc.

The above text is an excerpt from:

OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot

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