Oracle Cluster 11GR2 with Oracle Applications

#11900

Yury Velikanov & Maris Elsins

Agenda

Applications & Single Client Access Name

Applications & RAC Load Partitioning

Autoconfig & ClusterAutoconfig & ASM

About Yury

Google: Yury Oracle[phone|email]

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Oracle ACE Director (1 from 8 Apps, RAC SIG board)

Oracle Certified Master (9i/10g/11g + 15 OCP certificates)

Oracle DBA with 12+ years Apps experience

Oracle 11G SCAN: Concepts and Implementation Experience Sharing (author)3000+ views on SlideShare.net

About Maris Elsins

Google: Elsins Oracle[phone|email]

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• Oracle [Apps] DBA 8 years PL/SQL Developer 3 years

• Oracle Certified Master OCP 9i/10g/11g/11i OC

• Speaker at Oracle conferences since 2007

• Pythian since 2011 (1 year = 3 years)Running E-Business Suite Database on Oracle Database ApplianceRoom 507, Mon. Apr. 8, 9:45 am - 10:45 am

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Applications & Single Client Access Name

1. Concepts introduction2. Implementation

SCAN Introduction• Single Client Access Name• Addresses the TNSNAMES multi address issue

• Old - 10G FAILOVER• Complex TNS entries• Complex to manage (add a node)• Previous Oracle Clients support

• New - 11GR2• One Simple TNS entry on client side• Easy to add nodes (address forwarding)• Transparent to Oracle Client versions• Load balancing & Failover management on Cluster side

SCAN Introduction

RAC: Frequently Asked Questions [ID 220970.1]How to Troubleshoot Connectivity Issue with 11gR2 SCAN Name [ID 975457.1]11gR2 Grid Infrastructure SCAN Explained [ID 887522.1]SCAN & EBS 11i [ID 823581.1 ] R12 [823587.1]

scan.clustgrid-prod.yourdomain.com + service

Oracle 11G SCAN: Concepts and Implementation Experience Sharing

Node 1

LISTENER (default) remote_listener

local_listener

LISTENER_ERP (custom)

Node 2

DNS resolves scan-cluster_a.mycomany.com to 3 SCAN IP addresses

SCAN (remote) listeners register and distribute information about local listeners serving a SERVICE

Oracle Instance: 1. registers SERVICES it running in LOCAL listeners 2. registers LOCAL listeners serving a service in SCAN listeners

LISTENER LISTENER LISTENER

1.

2.

service_name

SCAN & Apps

• R12 Apps & SCAN integration is optional• Apps could be configured to use traditional failover setup• Third party applications can leverage SCAN if necessary

• R12 & SCAN• There is a separate Apps listener• Running from Apps DB home• Managed by crvstl utility

Applications & Single Client Access Name

Implementation

SCAN & Apps Implementation

Using Oracle 11g Release 2 Real Application Clusters with Oracle E-Business Suite Release 12 [ID 823587.1]

Appendix D : Enabling/Disabling SCAN Listener Support in Autoconfig

• Step1: Configure SCAN context variables on DB nodes

<scanName oa_var="s_scan_name">mg-prod-oda01

<scanPort oa_var="s_scan_port">1524

<scanUpdateFlag oa_var="s_update_scan">TRUE

SCAN & Apps Implementation

• s_scan_name • a SCAN name used during initial RAC installation. This name should be

resolved all SCAN IP addresses by a network DNS service and shouldn’t be defined in any hosts file

• s_scan_port • a port SCAN listeners are listening on. This port is defined during initial

RAC installation

• s_update_scan • instructs AutoConfig to update database with the parameters specified

earlier (s_scan_name and s_scan_port)

SCAN & Apps Implementation

• s_db_listener • EBS listener name. EBS uses local listener started from EBS database oracle

home. Note that the name should be in the LISTENER_<ENV> formant on all DB nodes. This allows to define and manage the listeners as one listener cluster resource across all RAC nodes

• s_dbport• EBS listener port. This port should be different from Cluster’s VIP listener port• Both EBS local and Cluster’s local listeners uses the same VIP addresses

• s_instRemoteListener • the variable sets remote_listener parameter in the init.ora file. The variable is set

by AutoConfig utility if s_update_scan variable is set to TRUE.

• s_instLocalListener • the variable sets local_listener parameter in the init.ora file. The variable it

updated by AutoConfig utility if s_update_scan variable is set to TRUE.

SCAN & Apps Implementation

• Step 2: Run AutoConfig on ALL database nodes

• updates database init.ora• generates SCAN related configuration files

• populates several tables including • FND_DATABASES => IS_RAC_DB, SCAN_NAME,SCAN_PORT• FND_TNS_ALIASES• FND_DATABASE_INSTANCES …

• It is very important AutoConfig executed successfully on ALL RAC nodes

SCAN & Apps Implementation

• Step 3: Run AutoConfig on ALL application nodes

• generate INST1, INST2, etc and <SID>_BALANCE tns aliases that uses the SCAN parameters

• Verify that ALL tns aliases reference SCAN listener• INSTANCE_NAME=INSTx

• All set• Check SCAN & EBS listeners• Check connectivity from apps nodes

SCAN & Apps Implementation

PRDB1= (DESCRIPTION= (ADDRESS=(PROTOCOL=tcp)(HOST=mg-prod-oda01)(PORT=1524)) (CONNECT_DATA= (SERVICE_NAME=PRDB) (INSTANCE_NAME=PRDB1) ) )

PRDB_BALANCE= (DESCRIPTION= (ADDRESS_LIST= (LOAD_BALANCE=YES) (FAILOVER=YES) (ADDRESS=(PROTOCOL=tcp)(HOST=mg-prod-oda01)(PORT=1524)) ) (CONNECT_DATA= (SERVICE_NAME=PRDB) ) )

SCAN & Apps ImplementationPROBLEMS • Missing sqlnet.ora file reference

[ID 823587.1]• ADD IT

• Wrong "<scan_name>:<scan_port>" entry on database side’s tnsnames.ora• REMOVE IT

• Missing ORA_NLS10 parameter• ADD ITsrvctl setenv database -d <database_name> -t "TNS_ADMIN=$ORACLE_HOME/network/admin,ORA_NLS10=$ORACLE_HOME/nls/data/9idata“

APPLICATIONS & RAC LOAD PARTITIONING

CONCURRENT PROCESSING

Default configuration

Default configuration

• Good for small & other provisioned hardware systems

• Pros• easy to configure and maintain• high availability out of the box• allows smaller number of apps nodes

• Cons• opened to performance issues

Parallel Concurrent Processing

Parallel Concurrent Processing

• Pros• controlled load partitioning• controlled high availability• good performance

• Cons• requires at least the same number of apps nodes as DB

nodes• expensive to maintain

Target Instance (concurrent program)

Target Instance

• Pros• functional load partitioning• good performance• doesn’t requires the same number of applications nodes as

RAC nodes

• Cons • complex to maintain• limited fail-over options• can use instances names only (tns aliases)• doesn’t support all concurrent programs / managers

Using Services (vision)

Using Services (vision)

• Pros• No dependences from number of Apps nodes• Easy and well planed failover• Leverages setup we are use for years now• Single service balances across one or many nodes• Easy switchover or reconfiguration• Most reconfiguration is online• Leverages Oracle 11GR2 Cluster services • Resource manager • Resources (e.g. CPU, IO, etc) per service (e.g. payroll,

finance, etc.)• Cons

• Oracle Dev work :)

CONCLUSIONS

Conclusions• SCAN is One of the biggest Cluster 11GR2 features

• Oracle Applications R12 supports SCAN• Implementation is optional• There are still missing bits (services support)

• You should be careful implementing SCAN• There are some know issues

• You should consider functional load partitioning for big and active systems• Today the options are still a bit limited

Questions? Comments?

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