Data Delivery - Lazy versus Immediate
8.3.3 RangeSize Tuning
This parameter controls the number of records ADFm requests from the BC layer simultaneously. The default RangeSize is 25 records. Consider setting this value to the number of records to be displayed in the UI simultaneously for the View Object so that the number of round-trips between the model and BC layers is reduced to one. This is configured in the Iterator attribute of the corresponding pages page definition XML.8.3.4 Application Module Design Considerations
Designing an applications module granularity is an important consideration that can significantly impact performance and scalability. It is important to note that each root application module generally holds its own database connection. If a user session consumes multiple root application modules, then that user session can potentially hold multiple database connections simultaneously. This can occur even if the connections are not actively being used, due to the general affinity maintained between an application module and a user session. To reduce the possibility that a user can hold multiple connections at once, consider the following options: ■ Design larger application modules to encompass all of the functionality that a user needs. ■ Nest smaller application modules under a single root application module so that the same database connection can be shared among the nested application modules. ■ Use lazy loading for application modules. In the Application Module tuning section, customize runtime instantiation behavior to use lazy loading. Lazy loading can also be set JVM-wide by adding the following JVM argument: -Djbo.load.components.lazily=true More information can be found in the What You May Need to Know About Application Module Granularity and Defining Nested Application Modules sections of Oracle Fusion Middleware Fusion Developers Guide for Oracle Application Development Framework.8.3.5 Application Module Pooling
Application module AM pooling enables multiple users to share several application module instances. The configurations for the AM pool vary depending on the expected usage of the application. For detailed explanations of the different AM pool configurations, see Tuning Application Module Pools in Oracle Fusion Middleware Fusion Developers Guide for Oracle Application Development Framework. Oracle Application Development Framework Performance Tuning 8-19 Most of the AM pool parameters can be set through Oracle JDeveloper. The configurations are saved in bc4j.xcfg, which can be manually edited if needed. Parameters can also be set at the system level by specifying these as JVM parameters -Dproperty=value. The bc4j.xcfg configuration takes precedence over the JVM configuration; this enables a generic system-level configuration to be overridden by an application-specific exception.8.3.5.1 General AM Pool Configurations
The following guidelines can be used as a general starting point when tuning AM and AM pool behavior. Details for each parameter can be found in the Oracle Fusion Middleware Fusion Developers Guide for Oracle Application Development Framework. More specific tuning for memory or CPU usage can be found in Section 8.3.5.2, AM Pool Sizing Configurations . Table 8–7 Application Module AM Pool Tuning Configuration Recommendation Description Optimize the number of AM pools in the application. Parameters applied at the system level are applied per AM pool. If the application uses more than 1 AM pool, then system-level values for the number of AM instances must be multiplied by the number of AM pools to realize the actual limits specified on the system as a whole. For instance, if an application uses 4 separate AM pools to service the application and a system-level configuration is used to limit the max AM pool size to 100, then this can result in a maximum of 400 AM instances 4 pools 100 max pool size. If the intent is to limit the entire application to a max pool size of 100, then the system-level configuration should specify a max pool size of 25 100 max pool size 4 pools. Finer granularity for configuring each AM pool can be achieved by configuring each pool separately through JDev or directly in bc4j.xcfg. Optimize the number of database connections. By default AM instances retain their database connections even when checked back into the AM pool. There are many performance benefits to maintain this association. To maintain performance, consider configuring more AM instances than the maximum number of specified database connections. NOTE: If you have an AM pool that needs to be used as root pool, consider tuning at the specific AM pool level. For pools that are infrequently used, consider tuning pool sizes on the pool level so that top-level application parameters are not used. For more information see Setting Pool Configuration Parameters in Oracle Fusion Middleware Fusion Developers Guide for Oracle Application Development Framework.Parts
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» Related Documentation Oracle Fusion Middleware Online Documentation Library
» About Identifying Top Performance Areas
» Ensure the Hardware Resources are Sufficient
» Selecting a Garbage Collection Scheme
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» Logging Low Memory Conditions
» Monitoring and Profiling the JVM
» Initialization Parameters for Oracle 10g
» Initialization Parameters for Oracle 11g
» Tuning Redo Logs Location and Sizing
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» Reuse Database Connections Oracle Fusion Middleware Online Documentation Library
» Enable Data Source Statement Caching
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» Setting the Maximum Number of Connections for Data Sources Tuning the WebLogic Sever Thread Pool
» Tuning Oracle WebCenter Concurrency
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» About Oracle Fusion Middleware Performance Planning
» Define Operational Requirements Identify Performance Goals
» Understand User Expectations Define Your Performance Objectives
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» Analyze Static Versus Dynamic Requests
» Beware of a Single Data Point Yielding Misleading Results
» Beware of Having More Modules
» Monitoring Oracle HTTP Server
» DMS Nouns Common DMS Terms and Concepts
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» DMS Availability Oracle Fusion Middleware Online Documentation Library
» DMS Architecture Overview Oracle Fusion Middleware Online Documentation Library
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» Understanding DMS Event Output
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» About Oracle Metadata Services MDS
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» Using Database Polling Interval for Change Detection
» Document Cache Tuning Cache Configuration
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» About Oracle ADF Oracle Fusion Middleware Online Documentation Library
» Oracle ADF Faces Configuration and Profiling
» Performance Considerations for ADF Faces
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» Data Delivery - Lazy versus Immediate
» Performance Considerations for DVT Components
» Creating View Objects View Objects Tuning
» Configuring View Object Data Fetching
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» Batch Processing ADF Server Performance
» General AM Pool Configurations
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» Mapping and Descriptor Configurations
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» Optimizing Performance with Oracle ADF
» About SOA Suite Configuration Properties
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» Modifying SOA Configuration Parameters JVM Tuning Parameters About Oracle Business Rules
» Use Java Beans Basic Tuning Considerations
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» Dispatcher Invoke Threads BPEL Threading Model
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» Process Measurement Tuning Process Analytics
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» Entry Cache Enabled Configuration
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» About Oracle Virtual Directory Basic Tuning Considerations
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» Setting HTTP Session Timeout Setting JSP Page Timeout
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» Setting MDS Cache Size and Purge Rate Configuring Concurrency Management
» Tuning Performance of the Announcements Service
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» Enabling Java Object Cache for WSRP Producers
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» Tuning Performance of Oracle PDK-Java Producers
» Setting ExcludedActionScopeRequestAttributes for Portlets
» Setting DefaultServedResourceRequiresWsrpRewrite for WSRP Portlets
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