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Column sorting is slow

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    Column sorting is slow

    Hello,

    I have a grid that displays with 17 columns. 5 are editable, 1 is a button, and the remaining 11 are read-only. The user asked for all of these fields to display so they can see from a quick view what they need to see. Currently, their file is 564 records long. All display on one page (Records per page is all of them). When they click on a column heading to sort by that column, it can take 12 seconds to resort the page.

    Okay, first, I know you are going to say there is too much information on the page to display at once, and I should be happy with that speed. I get it. When I shrink the records per page down to 50, it re-sorts in 3 seconds.

    Aside from knowing that, is there anything I should be doing to speed it up? If Indexing the table is the answer, how should I do that not knowing what column they will pick? Does anyone have any thoughts on speeding this up?

    Thanks in advance.

    #2
    Re: Column sorting is slow

    I suspect the number or records will continue to grow so this problem will just get worse. The answer, of course, is to do the sorting in the database in the "order by" clause and not in Alpha. I think (but I have not tested) that if you have a search section for the grid, then you can use the "Sorting listbox" property and Alpha will create the SQL statement for you.
    Pat Bremkamp
    MindKicks Consulting

    Comment


      #3
      Re: Column sorting is slow

      Originally posted by cozzitech View Post
      Hello,

      I have a grid that displays with 17 columns. 5 are editable, 1 is a button, and the remaining 11 are read-only. The user asked for all of these fields to display so they can see from a quick view what they need to see. Currently, their file is 564 records long. All display on one page (Records per page is all of them). When they click on a column heading to sort by that column, it can take 12 seconds to resort the page.

      Okay, first, I know you are going to say there is too much information on the page to display at once, and I should be happy with that speed. I get it. When I shrink the records per page down to 50, it re-sorts in 3 seconds.

      Aside from knowing that, is there anything I should be doing to speed it up? If Indexing the table is the answer, how should I do that not knowing what column they will pick? Does anyone have any thoughts on speeding this up?

      Thanks in advance.
      Where is the actual bottleneck? You need to do some profiling to determine where the slowness is coming from.

      Note that the Grid's HTML is going to be computed on the Server before it is sent to the client, so you are downloading the HTML for the page from the server in one batch. If the payload is large, it can take a while to generate the HTML and download it.

      See https://documentation.alphasoftware....ies%20property to learn how to turn on the timer property in a Grid to profile your component.

      You may want to consider using a List in a UX rather than a grid to accomplish this task. The List can be sorted on the client, eliminating the callback to the server.
      Sarah Mitchell
      Director of Customer Success | [URL="https://www.alphasoftware.com"]Alpha Software Corporation[/URL]
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