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which statements are responsible for a large amount of disk and memory I/O; which statements are taking a long time to run These are the high-load statements that will be subjected to tuning analysis To view and adjust the window schedule, click Configure This will take you to the window shown in Figure 13-9, where there are radio buttons for enabling or disabling the jobs; buttons for configuring Optimizer Statistics Gathering and Automatic SQL Tuning jobs; links for editing the opening and closing times of the daily windows; and check boxes for selecting in which windows the various jobs will run The default settings for the maintenance window may well not be appropriate for you In many Middle Eastern countries, for example, Saturday and Sunday are working days Also, many databases support global organizations: just because it is the middle of the night for you, that doesn t mean it is for many of your end users
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Are their any restrictions on using the tuning and diagnosis wizards There certainly are The Oracle database standard edition license does not include most of the self-management facilities, and even with an Enterprise Edition license you need some extra, separately licensed, products You must check with your account manager before using any of them Always use the self-management capabilities and the tuning wizards and advisors, but use your brain as well You should know the data, the environment, and the patterns of activity of your database better than any wizard All the tools can do is apply rules and heuristics that are applicable to most systems Use your site knowledge to question the recommendations, and improve on them
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Okay, we have all the necessary licenses When should I use the automatic facilities, and when should I manage things the hard way
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13:
Database Maintenance
EXERCISE 13-3 Generate an ADDM Report
In this exercise, you will generate an ADDM report on activity between two snapshots 1 Connect to your database as user SYSTEM with SQL*Plus 2 Force the creation of an AWR snapshot
execute dbms_workload_repositorycreate_snapshot;
3 Simulate a workload by creating a table and running an anonymous PL/SQL block to generate some activity:
create table tmptab as select * from all_objects; begin for i in 110 loop insert into tmptab select * from all_objects; delete from tmptab; end loop; commit; end; /
4 Force the creation of an AWR snapshot, using the command in Step 2 This illustration shows Steps 2 4:
Use the Advisory Framework
5 Connect to your database as user SYSTEM using Database Control 6 Take the Advisor Central link in the Related Links section on the database home page The first report listed will be the ADDM report generated as a result of the snapshot, as shown here:
7 Take the Advisor Central link in the Related Links section on the database home page The first report listed will be the ADDM report generated as a result of the snapshot 8 Select the radio button for the latest ADDM report, and click the View Result button Study the report: it will show a spike of activity in the last few minutes, with a number of Findings beneath Click the findings to see the nature of the activity and the statements that caused it 9 To tidy up, drop the table from your SQL*Plus session:
drop table tmptab;
13:
Database Maintenance
CERTIFICATION OBJECTIVE 1304
Manage Alerts and Thresholds
The Alert system is why, from release 10g onward, the Oracle database can be described as self-managing In earlier releases, the DBA had to spend a great deal of effort on humdrum work that was essential but not always that interesting He/she also had to devise methods of picking up exceptional conditions as they occurred The Alert system can automate a large amount of work that previously fell into the DBA domain
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