Slides from Oracle's ADF Architecture TV series covering the Design phase of ADF projects, reviewing MDS infrastructure considerations for your ADF applications. Like to know more? Check out: - Subscribe to the YouTube channel - http://bit.ly/adftvsub - Design Playlist - http://www.youtube.com/playlist?list=PLJz3HAsCPVaSemIjFk4lfokNynzp5Euet - Read the episode index on the ADF Architecture Square - http://bit.ly/adfarchsquare

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Real World ADF Design & Architecture Principles
MDS Infrastructure Decisions
ORACLE
PRODUCT
LOGO
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
Image: imagerymajestic/ FreeDigitalPhotos.net

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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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