CQL join with 2-channel time-stamped application

Hello

I am trying to join the two channels that are time-stamped application, both are total-ordered. Each of these 2 channels retrieve data in a table source.

The EPN is something like this:

Table A-> processor A-> A channels->
JoinProcessor-> channel C
Table B-> processor B-> B-> channel

My question is, how are "simulated" in the processor events? The first event that happens in any channel and the Treaty as the timestamp, starting point get it? Or fact block treatment until all channels have published its first event?

Channel A
--------------
timestamp
1000
6000


Channel B
-------------
timestamp
4000
12000

Channel B arrived both of system a little later due to the performance of the db,

I would like to know if the following query won't work, whereas I would like to match the elements of channel A and B which are 10 sec window and out matches once in a stream.

The following query is correct?

Select a.*
A [here], B [slide 10 seconds of range 10 seconds]
WHERE a.property = b.property


I'm having a hard time to produce results of the join well I checked the time stamp of application on each stream and they are correct.
What could possibly cause this?

Thank you!

Published by: Jarell March 17, 2011 03:19

Published by: Jarell March 17, 2011 03:19

Hi Jarrell,

I went through your project that had sent you to Andy.

In my opinion, the following query should meet your needs-

ISTREAM (select t.aparty, TrafficaSender [range 15 seconds] t.bparty t, CatSender [range 15 seconds] c where t.aparty = c.party AND t.bparty = c.bparty)

I used the test of CatSender and TrafficaSender data (I show only the part bparty fields and here and that too as the last 4 characters of each)

TrafficaSender (, bparty)
At t = 3 seconds, (9201, 9900)
At t = 14 seconds (9200, 9909)
To t = 28 seconds (9202, 9901)

CatSender (, bparty)
At t = 16 seconds, (9200, 9909)
At t = 29 seconds (9202, 9901)

For query q1 ISTREAM = (select t.aparty, TrafficaSender [range 15 seconds] t.bparty t, CatSender [range 15 seconds] c where t.aparty = c.party AND t.bparty = c.bparty)

the results were-
At t = 16 seconds, (9200, 9909)
At t = 29 seconds (9202, 9901)

and it seems OK for me

Please note the following-

(1) in the query above I do NOT require a "abs1(t.ELEMENT_TIME-c.ELEMENT_TIME)".<= 15000"="" in="" the="" where="" clause.="" this="" is="" because="" of="" the="" way="" the="" cql="" model="" correlates="" 2="" (or="" more)="" relations="" (in="" a="" join).="" time="" is="" implicit="" in="" this="" correlation="" --="" here="" is="" a="" more="" detailed="">

In the above query, either W1 that designating the window TrafficaSender [range 15] and W2 means the CatSender [range 15] window.

Now both W1 and W2 are evaluated to CQL Relations since in the CQL model WINDOW operation over a Creek gives a relationship.

Let us look at the States of these two relationships over time

W1 (0) = W2 (0) = {} / * empty * /.
... the same empty up to t = 2
W1 (3) = {(9201, 9900)}, W2 (3) = {}
same content for W1 and W2 until t = 13
W1 (14) = {9201 (9900) (9200, 9909)}, W2 (14) = {}
same content at t = 15
W1 (16) = {9201 (9900) (9200, 9909)}, W2 (16) = {(9200, 9909)}
same content at t = 17
W1 (18) = {(9200, 9909)}, W2 (18) = {(9200, 9909)}
same content at up to t = 27
W1 (28) = {(9200, 9909), (9202, 9901)}, W2 (28) = {(9200, 9909)}
W1 (29) = {(9202, 9901)}, W2 (29) = {(9200, 9909), (9202, 9901)}

Now, the result.
Let R = select t.aparty, TrafficaSender [range 15 seconds] t.bparty t, CatSender [range 15 seconds] c where t.aparty = c.party AND t.bparty = c.bparty

It is the part of the application without the ISTREAM. R corresponds to a relationship since JOINING the 2 relationships (W1 and W2 in this case) that takes a relationship according to the CQL model.

Now, here's the most important point about the correlation in the JOINTS and the implicit time role. R (t) is obtained by joining the (t) W1 and W2 (t). So using this, we must work the content of R over time

R (0) = JOIN of W1 (0), W2 (0) = {}
the same content up to t = 15, since the W2 is empty until W2 (15)
R (16) = JOIN of W1 (16), W2 (16) = {(9200, 9909)}
same content up to t = 28, even if at t = 18 and t = 28 W1 changes, these changes do not influence the result of the JOIN
R (29) = JOIN of W1 (29), W2 (29) = {(9202, 9901)}

Now the actual query is ISTREAM (R). As Alex has explained in the previous post, ISTREAM leads a stream where each Member in the difference r (t) - R (t-1) is associated with the t. timestamp applying this to R above, we get

R (t) - R (t-1) is empty until t = 15
(16) R - R (16 seconds - 1 nanosecond) = (9200, 9909) associated with timestamp = 16 seconds
R (t) - R (t-1) is again empty until t = 29
(29) R - R (29 seconds - 1 nanosecond) = (9202, 9901) associated with timestamp = 29 seconds

This explains the output

Tags: Fusion Middleware

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    Published by: hot water on 9 January 2013 15:46

    >
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    >
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    >
    , even if said Oracle documentation you can not do, so I created a 3rd version of the function to manage the TIMESTAMPS explicitly. Surprisingly, it works fine. But then I noticed that he did not work with TIMESTAMP with time zones.
    >
    Perhaps due to another error "too many declarations? Because now, there will be THREE possible implicit conversions that might be made.
    >
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    >
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