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Slow Cross level Filter on Form when using Child of a Set

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  • Slow Cross level Filter on Form when using Child of a Set

    I have a set where doing a cross level filter with a from is dreadfully slow when you include any fields from a child (even outside of a form it is slow). The set has two 1:M links as follows:
     ||   ||
     ||   ||===t_clntlg
    Each DBF table has approx. 400,000 - 500,000 records

    To run the following filter would take upwards of 50+ seconds (snippet of code generated by action scripting)
    form.queryrun("T_Clntlg->Clint_Id = Var->v_SrvClient","Date","","No","<Cross Level>",.t.)
    My thought was to individually query the child first to get a list of Foreign Keys and then use those keys to filter the parent. So I wrote some in-line xbasic on a script to do that.
    '...Previous action script already prompted user for a value for v_SrvClient
    dim shared clntlgActlgIDs as c
    dim shared ActlgIDRecNos  as c
    'get FK IDs from the child table
    clntlgActlgIDs = table.external_record_content_get("t_clntlg","actlg1_ID","clint_id","clint_id = " + quote(v_SrvClient))
    'clean up list
    clntlgActlgIDs = remove_blank_lines(clntlgActlgIDs)
    clntlgActlgIDs = *remove_duplicatesi(clntlgActlgIDs) 
    'use FK list to get a list corresponding Recno of the parent
    ActlgIDRecNos = table.external_record_content_from_key_get("t_actlg1","recno() + ''",clntlgActlgIDs,"Actlg1_Id")
    After the above inline xbasic I have an action script line that runs the filter: (action script snippet)
    so this seems to run SUPER fast, basically instantly

    My questions are:
    • Do you guys see any "gotchas" in my code?
    • Do you see any issues running this in a network environment?
    • Is there an easier or better way to do this?
    • Is there a limit that I should keep in mind with using Is_recno_in() or the any variables I feed into it?

    I really would welcome and appreciate any feedback and critiques