Maintaining data of view objects in cache memory for repeated usage

Hi,
     We are developing an application which is having around 800 viewobjects that will be used as LOV in different screens. Therefore, it is decided to create a separate project for all such LOV view objects and keep the same in shared scope so that the data can be made availabe across the application.
     The application also communicates with different database schemas based on the logged-in county. For a particular user, LOV view object LovView1 should get the data fetched from Schema1 whereas for user2, the same LovView1 should get the data from Schema2.
     For this, we have created n number of ApplicationModules like AM1, AM2 etc in the project each one being connected to different database. A base application module also has been created and all the county specific AMs extend this base AM. Also all the LOV view object instances are included in this base AM so that they will be available in the county specific AMs also.The entire project is made as an ADF Library jar and this base AM is utilized by other projects for mapping the LOV by attaching the library.
     At runtime, whenever a particular viewobject is accessed, the findViewObject() method of the baseAM has been overridden and the logic is built in such a way to get the logged in user's county code from a session variable and based on the county, the corresponding AM is communicated with and the view object is returned.
     The view objects of the LOV project is used as LOV as well as for doing some other backend processes. In such cases, the view object is obtained and necessary filter conditions are appended to the view criteria and is executed to get the filtered rowset.
Now, my questions are,
1. Is it enough to create the jar for the LOVProject and access the view objects from the same baseAM across the application?
2. I wish to keep all the data in cache memory to avoid repeated DB hits for all the LOV view objects. How it can be achieved? To be more precise, consider two users user1 and user2 logging into the application with different county. When user1 access a LOV viewobject for the first time, data needs to be fetched from the DB, kept in application scoped cache memory and return the rowset. On subsequent calls to the viewobject, the data needs to be retreived from the cache and not from the DB. When user2 also access the same LOV viewobject, the same logic as explained for user1 should happen. How can I achieve this? Actually my doubt is when user2 access, will the data pertaining to user1 remains available in cache? If not, how to make it retain the data in cache?
3. I also wish to append a particular where condition to a viewobject irrespective of other considerations like logged in county, existing view criteria etc.. How can I do this? A separate thread for this requirement has been posted in the forum Including additional where clause conditions to view criteria dynamically
Kindly give me your suggessions.
Thanks in advance.
Regards.

Hi Vijay,
regarding your questions:
1. What is the difference between "TimesTen In-Memory Database" and
"In-Memory Database Cache" in terms of features and licensing model?
==> Product has just been renamed and integrated better with the Oracle database - Times-Ten == In-Memory-Cache-Database
2. Is "In-Memory Database Cache" option integrated with Oracle 10g
installable or a separate installable (i.e. TimesTen installable with only
cache feature)?
==> Seperate Installation
3. Is "In-Memory Database Cache" option same as that of "TimesTen Cache
Connect to Oracle" option in TimesTen In-Memory Database?
==> Please have a look here: http://www.oracle.com/technology/products/timesten/quickstart/cc_qs_index.html
This explains the differences.
4. After integrating "In-Memory Database Cache" option with Oracle 10g, data
access will happen only through Oracle sqlplus or OCI calls. Am I right here
in making this statement?
==> Please see above mentioned papers
5. Is it possible to cache the result set of a join query in "In-Memory
Database Cache"?
==> Again ... ;-)
Kind regards
Mike

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Hi,
1) When user is on dashboard and moves to other pages of the application, is there a way to release the memory used by view objects and underlying entity objects used by the views used to display the dashboard? Another point here is, our application requirement is to refresh the data from database when user moves between screens. Even if user switches back to dashboard screen after moving to other screen the data needs to be queried anyway. So for better memory management of the application we would like to release the memory for GC when user leaves our dashboard screens.
Note that premature optimization can be contra-productive and often is the root of all evil. In other words, as long as you don't experience performance problems, I would let the framework do its job - so be careful wanting too much without a reason. Anyway, to clear the entity cache (and this is the only memory you need to bother for) you can call <ApplicationModuleInstance>.getTransaction().clearEntityCache(String entityName);
clearEntityCache
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Another question I have is:
2) When a application module passivation occurs, will there be a snapshot taken for all view rows and entity caches or will it be only for pending DB state - entities added/modified/deleted? - We have lot of cases in our application where we display read-only dashboards and I am trying to understand if we can turnoff the passivation on view objects used to display read-only data if passivation deals with only pending DB state.
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Frank

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Thanks,
--Anil
http://oracleanil.blogspot.com/

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