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CQL cache query

dmitryz1
dmitryz1 Member Posts: 9
edited Dec 5, 2012 8:19AM in Complex Event Processing
Hello all,
I have an event and cache that suppose to add this event on each occurrence.
I have to build CQL query with following logic:
The same event happened three times during defined period of time (let's say last 7 days) .
Any help would be appreciated .

Regards,
Dmitry
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Answers

  • 887796-Oracle
    887796-Oracle Member Posts: 83 Employee
    One way to go is to build a 2 stage flow:

    First a view with a time window. Some thing like:

    select myField as field, count(*) as count .....
    from myChannel [range 7 days slide 1 hour]
    where whatever
    group by userID


    Then a query that uses the view:

    select field, .....
    from myView
    where count = 3

    This will give every hour a list of user ID (events) that in the last 7 days


    Please note that the events will continue to be created every 1 hour until the window will slide to such a place that count < 3.

    If you want to have the event output only 1 time and not every hour you can also put it in a cache (the output of the query) and add it to where clause in the query. Something like

    where count = 3 and filed not in cache.

    Hope this helps
  • dmitryz1
    dmitryz1 Member Posts: 9
    Thank you,884793 (Sorry,I don't know your name ),
    I believe that I missed some important information in my post.
    I don't have continuous flow of event .
    Time difference from event to event can be an hour or day.

    Regards,
    Dmitry
  • 887796-Oracle
    887796-Oracle Member Posts: 83 Employee
    This is why there is a time window of 7 days.

    It "looks" on all the events from the last 168 hours (7 days) and counts for each instance of field how may events
  • dmitryz1
    dmitryz1 Member Posts: 9
    edited Dec 5, 2012 8:19AM
    Hello 884793 ,
    It seems OK now.

    Thank You!
    Regards,
    Dmitry

    Edited by: dmitryz1 on Dec 5, 2012 5:19 AM
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