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Real World ADF Design & Architecture Principles MDS Infrastructure Decisions

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15th Feb 2013 v1.0

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Learning Objectives

•  At the end of this module you should be able to:

–  Identify the server infrastructure for your application MDS requirements

– Understand the MDS runtime architecture –  Identify the number of MDS repositories to create

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Program Agenda

•  MDS Repository •  MDS Runtime Architecture •  Deployment & Performance •  How Many MDS Repositories Do You Need?

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Oracle Metadata Service Repository

•  File based or database based •  Contains metadata (data about data) for Oracle Fusion Middleware

components, like –  Oracle BPEL Process Manager –  Oracle WebCenter –  Oracle Business Activity Monitoring –  Oracle Event Processing etc.

•  Contains information about your ADF application metadata

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Oracle Metadata Service Repository

•  Use Oracle Fusion Middleware Metadata Repository Creation Utility (RCU) to create the metadata repository in an existing database

•  A database can have multiple repositories installed •  A WLS domain can use multiple MDS installations •  For better performance, install metadata repositories on same site

as customizable components –  Keep network latency small

Database Repository

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MDS Database Repository Benefits

•  Better query performance •  A database-based MDS Repository uses the database transaction

semantics, to roll back any failed import or deployment •  Maintains versions of the documents in a database-based repository

–  Changes to metadata objects can be stored as separate version Provides version history and label

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MDS Structure

•  Independent logical repository within MDS repository •  MDS repository can have multiple partitions •  Can be associated with more than one application

–  Recommendation though is to use 1 partition for 1 application for ease of administration and maintenance

•  Can be deleted, cloned, imported and exported to move metadata from one environment to another

Partition

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Program Agenda

• MDS Repository • MDS Runtime Architecture • Deployment & Performance • How Many MDS Repositories Do You Need?

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MDS Runtime Architecture

•  Consists of MDS runtime engine and a set of Mbeans –  Applied to domain as part of the Java Runtime Files (JRF) template

•  Runtime engine –  Manages MDS Repository access and the import of Metadata Archive

(MAR) files contained in an EAR file –  Provides in-built runtime cache for application specific metadata objects

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MDS Runtime Architecture

•  MBeans are provided for WebLogic Sever Scripting Tool (WLST) and Enterprise Manager to – Clear cache –  Import and export application specific customizations – Manages

• The built-in meta object cache –  Cache size, purge interval, external change detection

• Repository connection retry

•  WLS MBeans are not the same as JSF Managed Beans

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MDS Runtime Architecture

WLS Admin Server

Managed WLS Server

Custom ADF Application

MDS Runtime

MDS Repository (RDBMS)

Enterprise Manager Fusion Middleware Control

MDS Administration MBean

WLST

MDS App MBean

Import/ Export

De- / Register Repositories

Repository Access MAR Import

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Program Agenda

•  MDS Repository •  MDS Runtime Architecture •  Deployment & Performance •  How Many MDS Repositories Do You Need?

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ADF Application Deployment Considerations

•  MDS personalization and customization for ADF applications is enabled at development time –  Configuration in adf-config.xml

•  MDS enabled ADF applications must be explicitly associated with a specific MDS repository and partition –  JDeveloper –  MDS WLST commands –  Enterprise Manager Deployment Wizard

•  Seeded customization require application EAR file to contain special MAR file

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Metadata Cache

•  MDS uses a cache to store metadata objects in memory •  Shared cache is accessible to all users of the application that are on

the same JVM •  Metadata object that are requested repeatedly, with the same

customizations, are retrieved more quickly from the cache •  Initial cache size can be configured in adf-config.xml prior

deployment

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MDS Performance Tuning Hints

•  Tuning Database Repository –  For MDS database indexes to work best RDBMS schema statistics are

needed –  Generally, larger redo log files provide better performance –  Have database administrators manually rebuild indexes and shrink MDS

tables to increase performance and to reclaim disk space –  See: Oracle Database Performance Tuning Guide

•  Purging Document Version History –  Choose a sensible auto purge frequency –  Setting in adf-config.xml that can be changed at runtime

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MDS Performance Tuning Hints

•  Using Database Polling Interval for Change Detection –  MDS poll the database to gauge if the data in the MDS cache is out of

sync with data in the database –  If it is out of sync, MDS clears any invalid data from the cache for

subsequent operations –  Default poll interval is 30 seconds. Try to find the best setting for your

deployment –  Polling interval can be configured or changed post deployment through

Mbeans or, before deployment, in the adf-config.xml file

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Program Agenda

• MDS Repository • MDS Runtime Architecture • Deployment & Performance • How Many MDS Repositories Do You Need?

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How many MDS repositories and partitions do we need and what should they contain?

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There is no hard rule, but there is a strategy to share

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MDS Repository Infrastructure Consideration

•  Define a MDS repository infrastructure that guarantees ease of administration, ease of configuration and best performance –  Many small repositories vs. one monolithic repository –  Infrastructure cost vs. cost of administration for large repository

•  Plan for application versioning –  You may have the requirement to run two versions of an application in

parallel –  ISVs may sell and maintain different versions of your product

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MDS Repository Infrastructure Consideration

•  Consider different Fusion Middleware releases and patch sets –  Application may not be able to migrate to a new FMW patch set or

release with all FMW components at once

•  Consider repository version de-commission –  You should be able to easily get rid of metadata of application and FMW

versions that are no longer in use

•  Ensure the production environment is secure

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MDS Repository Recommendation

•  Use database repositories –  Exception: When developing seeded customization in JDeveloper,

development uses a file based repository

•  Use different repositories for Dev, QA and Prod •  Use partitions for application versions

–  fod-v1-dev, fod-v1-test, fod-v1-prod –  fod-v2-dev, fod-v2-test, fod-v2-prod

•  Create distinct repositories for FMW components

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MDS Repository Strategy and Blueprint

•  "APPLICATION MDS REPOSITORIES" - SOA - WebCenter - Application - etc.

•  "APPLICATION MDS INFRASTRUCTURE" –  Instances of " APPLICATION MDS REPOSITORIES " for Dev, Test,

Production

•  Duplicate APPLICATION MDS INFRASTRUCTURE for each FMW version or patch set

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Conclusion

•  Customization and Personalization should be considered as part of the application design to avoid unnecessary coding

•  Consider performance aspects when applying customizations and personalization features

•  Customization may be used to enforce security. If you do so –  Ensure application is save when MDS repository content is missing –  Implement defense in depth in that you backup MDS security

definitions in the application

•  Consider a deployment strategy that allows you to upgrade applications and FMW components

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Further Reading

•  Oracle Fusion Middleware WebLogic Scripting Tool Command Reference –  http://docs.oracle.com/cd/E12839_01/web.1111/e13813/custom_mds.htm

•  Oracle Fusion Middleware Administrator's Guide –  http://docs.oracle.com/cd/E17904_01/core.1111/e10105/repos.htm

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