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OCP Instructors Guide for Oracle DBA Certification

Chapter 8 - Miscellaneous Oracle Information

Monitoring Space Utilization and Performance Statistics Historically

The following statements show you how to create a history table and then insert information into it. Run the insert script on a daily basis. It will give you and idea on how to create and load additional tables for performance stats (and whatever else you decide that is important to track historically). Hint: You may want to write PL/SQL to load some statistics into the performance tracker.

Creating the tracking tables:

create table system.extents_tracker (run_date date, tspace varchar2(30),
segtype varchar2(17), segowner varchar2(30),
segname varchar2(81), segext number, segbytes number,
seginit number, segnext number, segpctinc number)
tablespace tools storage (initial 50K next 50k pctincrease 0);
create table system.space_tracker (run_date date, tspace varchar2(30),
fileid number, maxspace number, minspace number, avgspace number, totspace
tablespace tools storage (initial 50k next 50k pctincrease 0);

Run these statements on a daily basis to update the tables:

insert into system.extents_tracker (run_date, tspace, segtype, segowner, segname, segext, segbytes, seginit, segnext, segpctinc) select sysdate, tablespace_name, segment_type, owner, segment_name, extents, bytes, initial_extent, next_extent, pct_increase from DBA_SEGMENTS where owner not in ('SYS', 'SYSTEM') and extents > 20;
insert into system.space_tracker (run_date, tspace, fileid, maxspace, minspace, avgspace, totspace)
select sysdate, tablespace_name, file_id ,
max (bytes) , min (bytes), avg (bytes), sum (bytes)
from sys.dba_free_space

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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