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Using Sets and performance - design question

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  • Using Sets and performance - design question

    I am working on my A5 application. The db is relational and was designed around the concept of a master/parent table with all other tables being detail or child tables to the master/parent. Because of the way I designed the tables it would be possible to create a single set with the containing the parent and all the children. I could then reuse the single set for all my forms, reports, etc. However, I am now thinking this could create a performance problem and it may be better to have a number of smaller sets instead.

    I am wondering if anyone has any experience or thoughts on the matter. I am not certain how A5 handles the tables and sets under the hood, such as when the datasets are loaded with data, etc. Clearly I don't want to design poor performance into my application.

    If this has been answered before my apologies. I have tried to search the forums and the wiki but without success.

    Any advice is appreciated.
    Regards,

    John W.
    www.CustomReportWriters.net

  • #2
    Re: Using Sets and performance - design question

    John, I was informed that the Data in the Set relationship was created when the set was opened, so I'd favour smaller sets on grounds of less complexity.
    Also, sets can be inverted to facilitate ease of reporting, and I have to admit that I have moved away from complicated sets EXCEPT where the view is a single view with no updates.
    Example.
    I have a social care process involving some 78 tables and 21 sets. It's too big to lump into one Set, however the approach I took for the most data to be displayed was to have 18 tables in a Set which can only be Viewed. The Form has Tabbed SubForms so it really does all fit on the page.
    Individual table elements are grouped intop smaller Sets for editing.
    Hope this helps.
    See our Hybrid Option here;
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    • #3
      Re: Using Sets and performance - design question

      Thanks Ted!

      It reinforces my thinking that just because you can do something that does not make it the best choice. Even though my application at this point has only 13 tables, (a few more will need to be added) and 1 Set based on 2 tables that by going to a single one size fits all Set would over time create a performance issue. So I think I will add more sets each based on smaller numbers of tables.
      Regards,

      John W.
      www.CustomReportWriters.net

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