JMS / MBD Best Practices

Hello All,
There is currently a dispute in my camp about the limit of "responsibility" to place on a single MDB. In this case, the argument surrounds whether it is "good practice" to allow a MDB's onMessage function to:
- Open a connection to a servlet (the URL object obtained via Connection Manager via JNDI)
- Post some data
- Read the response and log it to local DB via JDBC
Firstly, is this too much responsibility for a single MDB?
Secondly, can someone please point me in the direction of some good MDB "Best Practices" documentation out there, free or otherwise.
I'm looking forward to settling this dispute.
Thank you all in advance.

Hi,
A MDB may become one of your application bottlenecks if it has to perform a time expensive operation. In such a case it may result of messages pilling up in your destination and dependent process blocking for an asynchronous event. But however, if your MDB work is isolated then its message throughput should not impact the overall application speed and can therefore be delegated expensive computation (assuming that the number of messages waiting to be processed is reasonable).
In your particular case, I would say that you should be ok assuming that your servlet doesn�t suffer too long downtimes. Depending of your expected traffic you will have to deploy the right number of servelet and MDB instances.
Hope this helps
Arnaud

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    *bump                                                                                                                                                                                                                                                           

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    I am currently working on a complex OBIEE project/solution where I am going straight to the production tables, so the fact (and dimension) tables are pretty complex since I am using more sources in the logical tables to increase performance. Anyway, what I am many times struggling with is the Logical Levels (in Content tab) where the level of each dimension is to be set. In a star schema (one-to-many) this is pretty straight forward and easy to set up, but when the Business Model (and physical model) gets more complex I sometimes struggle with the aggregates - to get them work/appear with different dimensions. (Using the menu "More" - "Get levels" does not allways give the best solution......far from). I have some combinations of left- and right outer join as well, making it even more complicated for the BI server.
    For instance - I have about 10-12 different dimensions - should all of them allways be connected to each fact table? Either on Detail or Total level. I can see the use of the logical levels when using aggregate fact tables (on quarter, month etc.), but is it better just to skip the logical level setup when no aggregate tables are used? Sometimes it seems like that is the easiest approach...
    Does anyone have a best practice concerning this issue? I have googled for this but I haven't found anything good yet. Any ideas/articles are highly appreciated.

    Hi User,
    For instance - I have about 10-12 different dimensions - should all of them always be connected to each fact table? Either on Detail or Total level.It not necessary to connect to all dimensions completely based on the report that you are creating ,but as a best practice we should maintain all at Detail level only,when you are mentioning any join conditions in physical layer
    for example for the sales table if u want to report at ProductDimension.ProductnameLevel then u should use detail level else total level(at Product,employee level)
    Get Levels. (Available only for fact tables) Changes aggregation content. If joins do not exist between fact table sources and dimension table sources (for example, if the same physical table is in both sources), the aggregation content determined by the administration tool will not include the aggregation content of this dimension.
    Source admin guide(get level definition)
    thanks,
    Saichand.v

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