3Copyright © 2008, Oracle. All rights reserved.

Using Automatic Workload Repository

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Objectives

After completing this lesson, you should be able to do the following:• Create and manage AWR snapshots• Generate AWR reports• Create Compare Periods reports

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Automatic Workload Repository: Overview

SGA

V$ DBA_*

ADDM Self-tuningcomponent

Self-tuningcomponent

…Internal clients

External clients EM SQL*Plus …

Efficientin-memorystatisticscollection

AWRsnapshotsMMON

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Automatic Workload Repository Data

Advisorresults

AWR

SQLstatistics

Basestatistics

Metrics ASH

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Workload Repository

SYSAUXSGA

In-memorystatistics

6:00 a.m.7:00 a.m.8:00 a.m.

Snapshot 1Snapshot 2Snapshot 3Snapshot 49:00 a.m.

9:30 a.m.

ADDM finds top problems.MMON

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Database Control and AWR

Edit snapshot parameters

Run AWR report

Manage snapshots

Manage baselines

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AWR Snapshot Purging Policy

SYSAUX tablespace

sys schema

SnapshotSnapshotSnapshotSnapshot

8days

Snapshot

MMON

Every night

60 min

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AWR Snapshot Settings

DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS ( retention IN NUMBER DEFAULT NULL, interval IN NUMBER DEFAULT NULL, topnsql IN NUMBER DEFAULT NULL);

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Manual AWR Snapshots

Create a snapshot

DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT (};

DBMS_WORKLOAD_REPOSITORY.DROP_SNAPSHOT_RANGE(LOW_SNAP_ID => 102,HIGH_SNAP_ID => 105);

Drop one or more snapshots

Create and delete snapshots using EM

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Managing Snapshots with PL/SQL

DBMS_WORKLOAD_REPOSITORY Package

Procedure Name DescriptionCREATE_SNAPSHOT Create a manual snapshot immediately

DROP_SNAPSHOT_RANGE Drop a range of snapshots

MODIFY_SNAPSHOT_SETTINGS Modify the snapshot settings

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Generating AWR Reports in EM

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Generating AWR Reports in SQL*Plus

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Reading the AWR Report

• The first section provides– Overview – Most significant diagnostics

• Additional pages– Detailed statistical information for specific areas

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Snapshots and Periods Comparisons

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Compare Periods: Benefits

DBA

≠

DBA

≠

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Compare Periods: Results

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Compare Periods: Report

WORKLOAD REPOSITORY COMPARE PERIODS REPORT

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Compare Periods: Load Profile

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Compare Periods: Top Events

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Summary

In this lesson, you should have learned how to:• Create and manage AWR snapshots• Generate AWR reports• Create Compare Periods reports

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Practice 3 Overview: Using AWR-Based Tools

This practice covers the following topics:• Create and manage Automatic Workload Repository (AWR)

snapshots• Generate and view the sections of an AWR report• Generate and view the sections of a Compare Periods report