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DynaCache with WebSphere Commerce

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Web site caching

1. Web site performance
   1. J2EE Web site topologies and caching
   2. Web site performance issues
      • e-Commerce Web site types
      • Unnecessary re-creation of page data
      • Network traffic between tiers
        • TCP/IP keep-alive and time-out
      • WebSphere Funnel model
      • Reduce thread/process switches and CPU load
   3. Project planning
      • Timing
      • Plan for caching early in the design phase
      • Roadmap
      • System performance tuning
      • Performance tuning skills
      • Training
      • IBM Tech-line assistance
   4. Performance terminology
      • Response time
        • Vertical scaling
        • Horizontal scaling
      • Load
      • Throughput
      • Throughput plateau
      • Throughput saturation
      • Path length
      • Bottleneck
      • Scalability
   5. Vertical scaling
   6. Horizontal scaling

   
   

2. Caching
   1. Caching overview
      • How caches work
        • Cache identifiers
        • Cache hits and misses
        • Cache invalidation
        • Cache item dependencies
      • Where caching is performed
      • The value of Web caching
      • Static versus dynamic object caching
      • Full Web page versus fragment caching
      • Cache considerations
   2. Introduction to DynaCache
      • DynaCache history
        • WebSphere Commerce caching history
   3. Enabling WebSphere Application Server DynaCache
   4. DynaCache technical overview
      • Features of DynaCache
   5. Servlets and DynaCache
      • Servlet technology
      • Request attributes
      • Servlet filters
      • WebSphere Commerce caching filter
      • JSP includes and forwards
        • JSP include
        • JSP forward
   6. Configuring DynaCache using XML-based policies
      • Basic structure of the cachespec.xml file.
      • Cache entry element overview <cache-entry>
      • Cache ID Overview
      • Cache IDs and the cache hit
      • Cache programming support
      • Dependency ID overview <dependency-id>
      • Invalidation rules overview <invalidation>
      • Command-based invalidation
      • Delay-invalidations
      • The effect of updates to the cachespec.xml file
        • Cache entry order is important
   7. Putting items into the DynaCache
      • Caching servlets and JSPs
      • Java objects and the command cache
      • Command interface
      • DynaCache full page caching
        • Consume-subfragments
      • DynaCache fragment caching
        • do-not-cache
        • do-not-consume
   8. Invalidation: Getting stale objects out of the cache
      • Time-based invalidation
      • Command-based invalidation
      • Triggered invalidation
   9. The ConsumerDirect cachespec.xml file
      • Element <class>
      • Element <name>
      • WebSphere Commerce ECActionServlet explained
      • Cache-id definitions for ConsumerDirect
        • TopCategoriesDisplay
   10. Impact of memory cache on JVM garbage collection
       • kCluster
       • How fragmentation occurs
       • How to avoid fragmentation
       • Configuring the kCluster
       • Configuring the pCluster
       • Configuring the LOA
   11. Configure disk offload
       • Tuning the disk cache
       • Custom JVM properties
   12. Displaying cache information
       • Install the cacheMonitor.ear application
       • Cache monitor viewing capabilities
       • Cache monitor operational tasks

   
   

3. DynaCache invalidation
   1. DynaCache invalidation defined
   2. Invalidation overview
   3. DynaCache invalidation mechanisms and tools
   4. The invalidation process
   5. Cachespec.xml invalidation policies
   6. Dependency identifiers
   7. Command-based invalidation
   8. Rule-based invalidation
   9. Timeout
   10. Inactivity
   11. Priority
   12. DynaCache invalidation API
   13. Scheduled invalidation
   14. Cache Monitor
   15. Capabilities
   16. Installation
   17. Invalidation best practices and techniques
   18. Time out considerations
   19. Cache monitor
   20. Dependency IDs
   21. Cache instances
   22. Warm shutdown
   23. Invalidation during the tuning phase
   24. Startup - use warm-up to create cache entries
   25. Impact of maintenance

   
   

4. Clustering DynaCache
   1. Data Replication Service
   2. Failover and caching
   3. DRS and failover
   4. DRS and caching
   5. Replicators
   6. N-way peer to peer
   7. Single replica
   8. WAS v5 to v6 migration
   9. Replication in DynaCache
   10. Sharing policy
   11. Specifying the sharing policy declaration in the cachespec.xml
   12. Troubleshooting
   13. Replication problem: Message size
   14. Best practices

   
   

5. Caching strategy
   1. Site requirements
   2. Identifying cache objects
   3. Characteristics of cacheable objects
   4. Tools and methodology
   5. Analytics
   6. Tools on alphaWorks
   7. Code review
   8. Cache design
   9. Full-page caching and fragment caching
   10. Cache instances
   11. Invalidating cached objects
   12. DynaCache and JSP
   13. JSP dynamic includes
   14. JSTL
   15. Struts
   16. Tiles

   
   

6. Advanced topics
   1. What is new in v6 of DynaCache
      • Disk cache enhancements
      • Cache policy enhancements
        • Property do-not-cache
        • Skip-cache-attribute
        • Value/not-value ranges
        • Store-cookies property
        • Consume-subfragments exclude
        • Portlet caching
   2. Edge Side Include (ESI) caching
   3. Priming the cache
   4. When not cache
   5. Multiple caching pools and cache instances
      • Cache instance
      • Cache instance definition
   6. DynaCache tuning
   7. Memory caching
      • Cache sizing formula
      • Disk caching
        • persist-to-disk
        • Disk cache cleanup
   8. Setting custom system properties
      • com.ibm.ws.cache.CacheConfig.htodDelayOffload
      • com.ibm.ws.cache.CacheConfig.htodDelayOffloadEntiresLimit
   9. Monitoring DynaCache
      • DeveloperWorks tooling for monitoring DynaCache
   10. Reference section
       • Class element
       • Name element
         • <name>Command</name>
         • <name>Servlet</name>
         • <name>webservices</name>
       • Sharing policy
       • Property
       • Cache entry IDs
   11. Component sub-element
   12. Timeout
   13. Inactivity
   14. Priority
   15. Property sub-element
   16. Idgenerato and metadatagenerator sub-elements
   17. Dependency-id element
   18. Invalidation element
   19. Invalidationgenerator sub-element
   20. Cache servlet filtering and Commerce DC_ variables
   21. ConsumerDirect jspStoreDir issue

   
   

7. FAQs
   1. DynaCache FAQs
   2. Clustering FAQs

   
   

8. DynaCache implementation

   
   

   1. DynaCache tutorial
      1. Environment setup
         • Software stack
         • WebSphere Commerce setup
         • Modify the WCS instance to handle "double clicks"
         • Enable DynaCache service
      2. Installing the Cache Monitor
      3. Caching ConsumerDirect store
         • Catalog subsystem URLs
         • TopCategoriesDisplay
         • CategoryDisplay
         • ProductDisplay

      
      

   2. Benchmarking DynaCache
      1. Overview
         • Benchmarking benefits
         • Benchmarking considerations
         • Target criteria
         • Workload characteristics
         • Test vs. production environments
         • Benchmarking DynaCache
         • Obtaining the baseline results and measuring improvements
         • Identifying possible impacts of DynaCache
         • Tuning DynaCache parameters
      2. Benchmark creation process
         • Setting up benchmark-creation tests
         • Environment
         • Tools
         • Test scenarios
         • Executing tests and recording results
         • Performance metrics
         • Execution conditions
         • Information to be recorded
         • Interpreting and analyzing the test results
      3. Benchmarking example
         • Test environment
         • Topology
         • Stack configuration
         • Test data set and scenario
         • Data set
         • Test scenario
         • Execution and results
         • concurrent users without DynaCache
         • concurrent users caching the product display page only
         • concurrent users using cachespec.xml
         • concurrent users without DynaCache
      4. Conclusion

      
      

   3. Case study: A DynaCache anti-pattern
      1. Online shop project brief
      2. Issues encountered
         • DynaCache not enabled
         • Inability to cache page fragments
         • Cache invalidations causing severe performance impacts
         • Cached page sizes greater than 200Kb
         • Large numbers of duplicated similar cache areas
      3. Lessons learned from the exercise
         • Include DynaCache in the design of applications
         • Retrofitting DynaCache will only be a limited success
         • Use accurate workload traffic for simulation
         • Invalidate as little as possible
         • Warm up the cache
      4. Changes in the next version of the online shop
         • Break all pages into cacheable fragments
         • Reduce the number of dependency IDs
         • Remove cache page expiries
         • Incorporate DB triggers to update the CACHEIVL table
         • Write a scheduled task to clean the CACHEIVL table
         • Fix inefficiencies in the search fragments
      5. Conclusion

      
      

   4. Seven steps to get started caching your WebSphere Commerce Web site
      1. Servlet caching
      2. Caching personalized fragments
      3. Excluding self-executing fragments from the cache
      4. Fragment caching
      5. Command caching
      6. Invalidation
      7. Replication

      
      

   5. Appendix A. Web services caching
      1. WebSphere Web service caching support
      2. WebSphere Commerce Web service caching
      3. Overview of the WebSphere Commerce Web services framework
      4. Related information
      5. Caching the business logic
      6. Caching the response

      
      

   6. Appendix B. Caching in WebSphere Extended Deployment
      1. Introduction to WebSphere XD
      2. Dynamic operations
      3. High performance computing
      4. Extended manageability
      5. On-demand router
      6. WebSphere Commerce and WebSphere XD
      7. References

      
      

   7. Appendix C. Sales Center caching
      1. IBM Sales Center
      2. Caching the response in Sales Center

      
      

   8. Abbreviations and acronyms

      
      

   9. Related publications
      1. IBM Redbooks
      2. Online resources
      3. Redbook Home