Oracle Diagnostics Pack Data Sheet

Oracle Diagnostics Pack Data Sheet
Oracle Diagnostics Pack, a part of the Oracle Database 11g product
set, offers a comprehensive set of automatic performance diagnostics
and monitoring functionality built into core database engine and
Oracle Enterprise Manager. Whether you are managing one or
Automatic Database
Diagnostic Monitor (ADDM)
many databases, Oracle Diagnostic Pack offers a complete, cost
Automatic Workload
Repository (AWR)
effective, and easy to use solution for managing the performance
Performance Monitoring
your Oracle Database environment. When used as part of Oracle
Active Session History (ASH)
Enterprise Manager Grid Control, Diagnostic Pack additionally
Advanced Event Notification
provides enterprise-wide performance and availability reporting, a
Automatic Performance
Diagnostic liberates
administrators from this
complex and time consuming
task, and ensures quicker
resolution of performance
Automatically maintained
workload history facilitates
historical performance
Comprehensive System
Monitoring and Advanced
Event Notification reduce
management cost and help
deliver better quality of
centralized performance repository, and valuable cross-system
performance aggregation, significantly simplifying the task of
managing large sets of databases.
Automatic Performance Diagnostic
Diagnosing a slowly performing system is a time consuming task often surrounded
by myths and legends, few of them based on fact. A number of third party tuning
tools are available today but few of them are geared towards answering common
questions such as, ‘How can I make the biggest improvements in the system?’ or
‘Why is the system slower today than it was last week?’ Most products simply
provide a graphical display of raw database statistics, leaving users to determine the
root cause on their own by drilling through large amounts of raw data. Even with the
best of tools, this can be a complex and tedious task.
Oracle Diagnostics Pack 11g includes a self-diagnostic engine built right into the
Oracle Database 11g kernel, called the Automatic Database Diagnostic Monitor
(ADDM). This is a revolutionary, first of its kind performance self-diagnostic
solution that enables the Oracle Database 11g to automatically diagnose its
performance problems, thereby completely liberating administrators from this
complex and arduous task.
ADDM starts its analysis by focusing on the activities that the database is spending
most time on and then drills down through a sophisticated problem classification
tree to determine the root causes of problems. ADDM’s ability to discover the actual
cause behind performance problems, rather than just reporting symptoms, is just one
of the several factors which makes it much superior to any other Oracle database
performance management tool or utility. The problem classification tree used by
ADDM encapsulates decades of performance tuning experience of Oracle’s own
performance experts and it has been specifically designed to accurately diagnose the
most frequently seen problems, such as CPU/IO bottlenecks, poor connection
management, undersized memory, resource intensive SQL statements, lock
contention, etc. Each ADDM finding has an associated impact and benefit measure
to enable prioritized handling of the most critical issues. In Oracle Database 11g,
ADDM findings can be suppressed by DBAs to filter and display only findings of
interest. To better understand the impact of the findings over time, each finding has
a descriptive name that facilitates search, a link to number of previous occurrences
of the finding in last 24 hrs, and affected instances
For Oracle Real Application Cluster (RAC) environments, ADDM has a special
mode for cluster-wide performance analysis. In this mode, ADDM analyses the
RAC cluster and reports on issues that are affecting the entire cluster as well as its
individual instances. It performs database-wide analysis of global resources, such as
high-load SQL, global cache interconnect traffic, network latency issues, skew in
instance response times, I/O capacity, etc. In Oracle Database 11g, ADDM makes
performance analysis of a RAC database as simple as that of a single instance
Figure 1: ADDM displays affected instances in the Findings Table on the cluster database home page.
ADDM for RAC has been enhanced in Oracle Database 11g Release 2. Its reports
now include information on individual blocking sessions across RAC instances.
Automatic Workload Capture
To enable ADDM to accurately diagnose performance problems, it is important that
it has detailed knowledge of database activities and the workload the database is
supporting. Oracle 11g Diagnostics Pack, therefore, includes a built in repository
within every Oracle 11g Database, called Automatic Workload Repository (AWR),
which contains operational statistics about that particular database and other relevant
information. At regular intervals (once an hour by default), the Database takes a
snapshot of all its vital statistics and workload information and stores them in AWR.
AWR is designed to be lightweight and to automatically manage its use of storage
space, ensuring that it does not put additional management burden on administrators.
AWR forms the foundation for all the self-management functionality of Oracle
Database 11g. It is the source of information that gives the database a historical
perspective on how it is being used and enables it to make decisions that are
accurate and specifically tailored for the environment that system is operating in.
The information stored in AWR also facilitates historical performance analysis.
AWR contains all required information to draw a complete picture of database
activities at any given time in the past. This enables easy diagnosis of performance
problems that may be difficult to recreate.
A key component of AWR, is Active Session History or ASH. ASH samples the
current state of all active sessions every second and stores it in memory. The data
collected in memory can be accessed by a V$ view. This sampled data is also
pushed into AWR every hour for the purposes of performance diagnostics. ASH
enables performance analysis of transient problems that occur for a very short
duration and it replaces the need to use facilities like SQL trace.
AWR also supports the creation of performance baselines. A moving window
baseline of 8 days is available out-of-the-box for helping compare performance to
the previous week and can be customized if needed. These AWR Baselines can then
be used for subsequent comparisons of current system performance to the baseline
period to identify performance divergences and their root-causes
Oracle Database 11g Release 2 extends ASH by gathering additional RAC
information to be used by advisors. The ASH report now lists events that account for
the highest percentage of session activity in the cluster wait class along with the
instance numbers of the affected instance. This information gives further visibility
into potential RAC specific issues. ASH has also been extended to run on standby
databases to assist in analysis of Dataguard performance..
Figure 2: Historical performance analysis using AWR data
Comprehensive System Monitoring
Oracle Diagnostics Pack 11g includes powerful technologies that automate the
monitoring of the complete environment and make the required information readily
available to administrators. It automatically examines the vital signs of different
components, such as databases, individual instances and host operating systems, and
stores the required historical information to provide administrators a long-term view
of their system behavior and help them administer service level goals more
Organized in three sections, the Database Performance Page displays host
information, user activity and throughput information on a common screen, for easy
correlation. With this information the DBA can verify that the machine has ample
CPU and memory resources available before analyzing the database. Then the
database health can be assessed from the Active Sessions graph that shows how
Oracle Diagnostics Pack
11g delivers maximum
benefits when used with
the following Oracle
much CPU the users are consuming and if there are users waiting for resources
instead of running on the CPU. Finally the page shows a throughput graph that can
be used to determine if throughput is affected by machine resources, CPU
consumption, or resource contention.
The Host Performance Page provides a quick glimpse of the CPU, memory and disk
bandwidth utilization at the machine level. Using the information presented on this
page and associated drilldowns, the administrator can find out details regarding how
Oracle Tuning Pack
Oracle Configuration
Management Pack
Oracle Provisioning Pack
Oracle Database Change
Management Pack
Oracle Real Application
Testing Option
machine resources are being used and which user or application are consuming most
system resources.
Advanced Event Notification
Enterprises require early problem detection in order to ensure timely resolution, but
over-alerting has historically plagued too many systems with high overhead and
false alarms. The Oracle Database 11g provides a built-in, push-based alerting
mechanism that is extremely efficient and accurate.
Oracle Diagnostics Pack 11g extends this alerting capability by allowing
administrators to be notified when they are away from their desks. Enterprise
Manager’s Notification Methods allow administrators to specify different
mechanisms for sending notifications, including e-mail, SNMP traps and running
custom scripts or PL/SQL procedures.
As alerts are being generated, the Oracle Enterprise Manager framework provides an
advice-driven intuitive response system that walks the administrator through alerts
resolution, including capabilities to setup automated responses where appropriate.
These features may be accessible through Oracle Enterprise Manager , Oracle SQL
Developer and APIs provided with Oracle Database software. The use of these and
other features described in the product licensing documentation requires licensing of
the Oracle Diagnostic Pack regardless of the access mechanism.
Contact Us
For more information about Oracle Diagnostics Pack, please visit or call
+1.800.ORACLE1 to speak to an Oracle representative.
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