Oracle Database 12c Release 2 QoS Management FAQs

Oracle Database 12c Release 2 QoS Management FAQs
ORACLE FAQ
Oracle Database
Quality of Service Management
Frequently Asked Questions
Q: What is Oracle’s goal in developing QoS Management?
A: QoS Management is a full Oracle stack development effort
to provide effective runtime monitoring and management of
datacenter SLAs by ensuring when there are sufficient
resources to meet all objectives they are properly allocated
and should demand or failures exceed capacity that the
most business critical SLAs are preserved at the cost of
less critical ones.
Q: What type of applications does Oracle QoS
Management manage?
A: QoS Management is currently able to manage OLTP open
workload types for database applications where clients or
middle tiers connect to the Oracle database through OCI or
JDBC. Open workloads are those whose demand is
unaffected by increases in response time and are typical of
Internet-facing applications.
Q: What does QoS Management manage?
A: In datacenters where applications share databases or
databases share servers, performance is made up of the
sum of the time spent using and waiting to use resources.
Since an application’s use of resources is controlled during
development, test, and tuning it cannot be managed at
runtime; however, the wait for resources can. QoS
Management manages resource wait times.
Q: What types of resources does QoS Management
manage?
A: Currently QoS Management manages CPU resources both
within a database including between PDBs and between
databases running on shared or dedicated servers. It also
monitors wait times for I/O, Global Cache, and Other
database waits.
Q: What type of user interfaces does QoS Management
support?
A: QoS Management is integrated starting with Enterprise
Manager 12c Cloud Control and above and is accessible
from the cluster target administration page.
Q: What QoS Management functionality is in Oracle
Enterprise Manager?
A: Enterprise Manger supports the full range of QoS
Management functionality organized by task. A Policy
Editor wizard presents a simple workflow that specifies the
server pools to manage; defines performance classes that
map to the database applications and associated SLAs or
objectives, and specifies performance policies that contain
performance objectives and relative ranking for each
performance class and baseline server pool resource
allocations. An easy to monitor dashboard presents the
entire cluster performance status at a glance as well as
recommended actions should resources need to be reallocated due to performance issues. Finally, a set of
comprehensive graphs track the performance and metrics
of each performance class.
Q: What types of performance objectives can be set?
A: QoS Management currently supports response time
objectives. Response time objectives up to one second for
database client requests are supported. Additional
performance objectives are planned for future releases.
Q: Does QoS Management require any specific database
deployment?
A: Oracle databases must be created as RAC or RAC One
Node Admin or Policy-Managed databases. For the later,
this means the databases are deployed in one or more
server pools. In both cases applications and clients must
connect using CRS-managed database services. Each
managed database must also have Resource Manager
enabled and be enabled for QoS Management. It is also
recommended that connection pools that support Fast
Application Notification (FAN) events be used for maximum
functionality and performance management.
Q: What are Server Pools?
A: Server Pools are a new management entity introduced in
Oracle Clusterware 11g to give IT administrators the ability
to better manage their applications and datacenters along
actual workload lines. Server Pools are a logical container,
where like hardware and work can be organized and given
importance and availability semantics. This allows
administrators as well as QoS Management to actively
ORACLE FAQ
grow and shrink these groups to meet the hour-to-hour,
day-to-day application demands with optimum utilization of
available resources. The use of Server Pools does not
require any application code changes, re-compiling or relinking. Server Pools also allow Admin-managed
supported databases and middleware to co-exist in a
single cluster without interfering with the management of
newer supported versions.
Q: What methods does QoS Management support for
classifying applications and workloads?
A: QoS Management use database entry points to “tag” the
application or workload with user-specified names.
Database sessions are evaluated against classifiers that
are sets of Boolean expressions made up of Service
Name, Program, User, Module and Action.
Q: What is the overhead of using QoS Management?
A: The QoS Management Server is a set of Java MBeans that
run in a single J2EE container running on one node in the
cluster. Metrics are retrieved from each database once
every five seconds. Workload classification and tagging
only occurs at connect time or when a client changes
session parameters. Therefore, the overhead is minimal
and is fully accounted for in the management of objectives.
Q: Does QoS Management negatively affect an
application’s availability?
separate database, both depend upon being able to deliver
performance with competing workloads. QoS Management
provides both the monitoring and management of these
shared resources, thus complementing the flexible
deployment of databases as a service to also maintain a
consistent level of performance and availability.
Q: Which versions of Oracle databases does QoS
Management support?
A: QoS Management is supported on Oracle RAC EE and
RAC One EE databases from 11g Release 2 (11.2.0.4)
forward. Starting in Oracle Database 12c (12.1.0.2) support
for Admin-managed databases was added.
Q: Is this a product to be used by an IT administrator or
DBA?
A: The primary user of QoS Management is expected to be
the IT or systems administrator that will have QoS
administrative privileges on the RAC cluster. As QoS
Management actively manages all of the databases in a
cluster it is not designed for use by the DBA unless that
individual also has the cluster administration responsibility.
DBA level experience is not required to be a QoS
Management administrator.
However, as QoS Management provides montoring
cablability and alerts on the individual database targets,
DBAs will find its dashboard useful for ensuring the
availability and performance of their databases.
A: No, the QoS Management server is not in the transaction
path and only adjusts resources through already existing
database and cluster infrastructure.
Q: Where can I find more information about Oracle Database
QoS Management?
Q: What happens should the QoS Management Server
fail?
A: Information on Oracle Database QoS Management is
available on OracleTechNetwork:
http://www.oracle.com/goto/qos.
A: The QoS Management Server is a managed Clusterware
singleton resource that is restarted or failed over to another
node in the cluster should it hang or crash. Even if a failure
occurs, there is no disruption to the databases and their
workloads running in the cluster. Once the restart
completes, QoS Management will continue managing in
the exact state it was when the failure occurred.
Q: How does QoS Management enable the on-premise
database clouds or DBaaS?
A: Database clouds fundamentally depend upon shared
resources. Whether deploying a database service or a
2 | Oracle Autonomous Health Famework FAQ
Oracle Database QoS Management also has its own user
guide which can be referred to at:
http://docs.oracle.com/database/122/APQOS/toc.htm.
Q: Do I need a separate license for Oracle Database QoS
Management?
A: Oracle Quality of Service Management, require an Oracle
RAC license. Please follow this link to the license guide for
more information:
http://docs.oracle.com/database/122/DBLIC/toc.htm
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