How oracle 12c flexes its muscles against oracle 11g r2

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11/21/2014

How Oracle 12c Flexes Its Muscles Against Oracle 11gR2

Ajith NarayananOracle ACE Associate

17th Nov-2014, Bangkok, Thailand.


11/21/2014

The views/contents in this slides are those of the author and do not necessarily reflect that of General Electric Company or Oracle Corporation and/or their respective affiliates/subsidiaries.

The material in this document is for informational purposes only, and is provided on an AS-IS basis.

Disclaimer


11/21/2014

Ajith Narayanan

∗ 10+ years of Oracle [APPS] DBA/Technical Architect experience.

∗ Oracle ACE Associate

∗ Blogger :- http://oracledbascriptsfromajith.blogspot.com

∗ Member:-OAUG, AIOUG

∗ Website Chair (2011-2013) – Oracle RACSIG http://www.oracleracsig.org

∗ AIOUG Real Application Clusters SIG Leader

Who Am I?


11/21/2014

Take away : End of the session, we should be able to clearly understand the high availability features provided by Oracle 12C version.

Agenda

� Introduction

� Oracle RAC – Over the years

� Oracle 11g R2 – Standard Cluster

� Oracle 12c Flex Cluster

� Oracle 12C – Flex ASM

� Conclusion

� Q & A


11/21/2014

Introduction


11/21/2014

∗ Oracle 12C, “C” stands for cloud, this database version is specially designed for the cloud.

∗ Heard about CDB, PDB, SEED etc.

∗ This session is all about, the introduction of high availability features like Flex Cluster & Flex ASM.

Introduction


11/21/2014

Oracle RAC – Over the years

� Oracle 9i

Database files, OCR & Voting disk on raw devices

� Oracle 10g

ASM for datafiles comes into picture

� Oracle 11g

OCR & Voting disk can be created in ASM too

� Oracle 11g R2

CRS home, ASM Home Consolidated,

Called “Grid infrastructure”

� Oracle 12C

Flex ASM, Flex Cluster

Oracle RAC – Over the years

GI GI GI GIApp1

App2

App3

App4

+ASM1 +ASM2 +ASM3 +ASM4

• Raw Devices• Voting Disk• OCR (9i Days)

+DATA+FRA

Datafiles


11/21/2014

Oracle 11g R2 – Standard Cluster

• A number of nodes/servers forming a cluster with a shared storage

• Being a member of the cluster all the nodes typically has the below running.

� Grid Infrastructure

� ASM

� Listener(s)

� Database Instance(s)

Oracle 11g R2 – Standard Cluster


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Oracle 12c Flex Cluster

• All nodes in an Oracle Flex Cluster belong to a single Oracle Grid Infrastructure cluster.

• Concept of Hub & Leaf nodes introduced

• Provide high availability , scalability and flexibility

� Hub

Hub Nodes are similar to Oracle Grid Infrastructure nodes in an Oracle

Clusterware standard Cluster configuration.

� Leaf

Leaf Nodes are different from standard Oracle Grid Infrastructure nodes,

in that they do not require direct access to shared storage, but instead

request data through Hub Nodes.

Oracle 12c Flex Cluster

∗ If a Leaf-node has access to shared storage, it can

perform a role change to a HUB-node.

∗ A Standard Cluster can be converted to a Flex Cluster

at any time after the installation.

∗ Once a cluster is configured as a Flex Cluster this

configuration is irreversible.

Oracle 12C – Flex Cluster

GI GI GI GI

App1

App2

App3

App4

+ASM1 +ASM2 +ASM3 +ASM4+DATA+FRA

DatafilesApp2

App2

App1

App1

App3

App3

App4

App4

Leaf Nodes

Leaf Nodes Leaf Nodes Leaf Nodes

Hub Nodes

Oracle 12C – Flex ClusterFlex Cluster can be configured during GI installation

Oracle 12C – Flex ClusterFlex Cluster can be configured using crsctl, later, But remember GNS setup should be done

#cluvfy stage –pre crsinst –n nodelist

#srvctl add gns --domain domain_name --vip vip_name

#srvctl start gns

#cluvfy comp gns --precrsinst --domain domain --vip gns_vip

#srvctl modify network --nettype MIXED

#srvctl update scan_listener

#srvctl update listener

#srvctl update database --db db_unique_name

SQL> alter database set remote_listener=["scan_name:scan_port"];

#cluvfy stage --post crsinst --n all

#srvctl modify network --nettype DHCP

#srvctl update database --db db_unique_name

#srvctl update scan_listener

#srvctl update listener

#srvctl modify scan --scanname scan_name

[root@ajithEBS1~]#crsctl set cluster mode flex

Cluster is configured for ”flex" mode

[root@ajithEBS1~]#crsctl stop crs

[root@ajithEBS1~]#crsctl start crs --wait

[root@ajithEBS1~]#crsctl set cluster mode flex

Cluster is already configured in "flex" mode

Oracle 12C – Flex ClusterNode Roles

� Once the node is converted to a leaf node, check

“crs_stat –t –v” it will have a local listener.

� # of ASM Instances also reduces

� VIP Fails over to available node

[root@ajithEBS1~]#./crsctl get node role config

Node 'ajithEBS1' configured role is 'hub’

[root@ajithEBS1~]#./crsctl set node role leaf

CRS--4408: Node 'ajithEBS1' configured role successfully changed;restart Oracle

High Availability Services for new role to take effect.

[root@ajithEBS1~]#./crsctl stop crs

[root@ajithEBS1~]#./crsctl start crs

Oracle 12C – Flex Cluster∗ ASM Network

• By default, it will share the interconnect NIC

• Can be changed during install, or later

∗ Grid Naming Services (GNS), Was optional during 11g days, and /etc/hosts were a workaround, But in 12C, it is mandatory to have the Grid Naming Service setup

• You can install GI in Standard Mode and reconfigure it with GNS prior to conversion to Flex Mode.

Oracle 12C – Flex ASM

Oracle 12C – Flex ASM∗ The Next generation Automatic Storage Management (ASM) has a new name

“Flex ASM”.

∗ Gone are the days, like, One ASM instance per node in a cluster.

∗ Your ASM configured to run on

fewer nodes in a cluster

∗ Allows for seamless client

connection failover

Oracle 12C – Flex ASM∗ Network

� Public Network

� Private Network

� Storage FC/ISCI

� ASM Network

With Oracle Flex ASM you can

– Consolidate all the storage requirements into a

single set of disk groups.

– Small set of Oracle ASM instances running in a single cluster manages all the diskgroups.

– Number of Oracle ASM instances can be set with cardinality setting. The default is three instances.

[oracle@ajithEBS2~]$srvctl modify asm --count 4

[oracle@ajithEBS2~]$srvctl modify asm --count ALL

Oracle 12C – Flex ASM

If installing an Oracle Flex Cluster, Oracle Flex ASM is enabled by default because an Oracle Flex Cluster requires Oracle Flex ASM.[oracle@ajithEBS2~]$ asmcmd Showclustermode

ASM cluster : Flex mode enabled

Oracle 12C – Flex ASMConnectivity

∗ Connections from a database instance to an ASM instance are based on SQLnet

using listeners.

∗ The listener directs the connection to the least loaded ASM instance based on the load metric it maintains.

∗ The ASM instance to which the database instance connects to is listed in the database alert log

∗ ASM instance die, it will be restarted automatically

– If an ASM instance crashes, it will be automatically restarted if ASM COUNT is set to ALL

– If an ASM instance crashes, and ASM COUNT is not set to ALL, it will be restarted on the first

available hub node

∗ 41

Oracle 12C – Flex ASMWhy use Oracle Flex ASM∗ Oracle Flex ASM supports larger LUN sizes for Oracle Database 12c clients.

∗ Maximum number of Disk Groups supported is 511.

∗ Flexibility to rename an ASM Disk in a Disk Group.

Network enhancement in Oracle Flex ASM∗ In previous versions the cluster requires:

- A public network for client application access

- One or more private networks for inter-node communication within the cluster including ASM traffic.

∗ Flex ASM adds the ASM network, which can be used for communication between ASM and its clients to isolate and offload ASM traffic Physical Metadata

Conclusion

– Clients are automatically relocated if an ASM Instance goes down

– Adding a new node to a cluster (which currently exists as a standalone) and

migration to ASM is easier

– Even though with previous releases, there is very little over-head of ASM

• Fewer resources on a Hub nodes without ASM to manage

– The database is not the super-star in the cluster!

Conclusion

Thank YouPlease contact me

@ [email protected] or http://oracledbascriptsfromajith.blogspot.com

How oracle 12c flexes its muscles against oracle 11g r2

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