Streams Help - Stuck in PAUSED FOR FLOW CONTROL

Hi All,
I am brand new to Streams and i'm trying to configure streams between two db's on different machines on the same network. Initially i was getting errors trying to connect to the remote database during Propagation(ORA-02019 connection description for remote database not found ). I think this was due to my db link being created incorrectly. I recreated my db link and i'm no longer getting those messages.
Now everything on my Source db looks like it's running except the Capture state is stuck in PAUSED FOR FLOW CONTROL and nothing is being propagated. The propagation process is enabled and i can see it in the dba_jobs views. I have never gotten this working yet.
Does anyone have general troublshooting tips for this. I have found detailed instructions on how to setup the stream but not much on how to troubleshoot.
Any advise would be greatly appreciated.
null

This error was due to a 'bad' database link. I'm still not positive why the link was bad but i recreated my db link and tested. After i confirmed it was active I re-setup my capture and propagation processes and all is good now.
thanks, dave

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Paused for Flow Control but no flow occurring

10.2.0.2
Our destination database had problems this AM and it was bounced. The capture process on the source went into "Paused for Flow Control" status and never recovered. Here's the process I went through.
1. There was nothing being propagated according to v$propagation_sender.
2. The apply process was running but was not receiving any messages according to v$streams_apply_reader, v$streams_apply_server
3. I stopped and restarted the apply process - no change.
4. I stopped and restarted the capture process and after the dictionary initilization it went back into the paused state.
5. alter logs showed nothing for either database.
6. dbms_propagation_adm.stop_propagation resulted in an ORA-24082
I finally had to run dbms_propagation_adm.stop_propagation with force=>true and restart it for data to start flowing again, albeit slowly.
So the question is - why? Why did I have to forcefully stop the propagation process and restart it when this is all supposed to be seamless? Is this expected behavior that others have run into and the proces you need to perform whenever your destination becomes unavailable for a time period?
Just curious.
Thanks - Brian

I've tried setting up a Streams for schema replication and have run into the "Paused for Flow Control issue". I'm not getting any streams errors so i don't know what's wrong with it.
I'm not that familiar with Streams so i'm not sure where to start to diagnose the problem. I used the Enterprise Manager to set up the streams and tried stopping and restarting the capture process but i'm still getting the "Paused for Flow Control issue". Where is the best place to start to look for a solution?
Thanks!

Need help with LabVIEW code for motor control.

Hi,
My name is Sasi. I am a BME grad student working on my thesis topic of evaluating spine implants for low back pain. For this I am building a test machine that would apply pure moments to a spine specimen. I am using LabVIEW 8.5 to implement control of a brushless AC servo motor. My requirement is,
Step 1: Initialize the motor.
Step 2: Start moving it at a uniform RPM to the right (This RPM value too user can enter).
Step
3: While doin Step 2; simultaneously read torque cell data (Using DAQ
asst.). DAQ o/p is from 0 V to 10 V; 0 V being -10 Nm n
10 V being +10 Nm
Step 4: When Torque value reaches +10 Nm, i.e 10 V, the motor stops.
Step
5: From the position where motor stopped (i.e no need to reset to
initial position) Start moving in the opposite direction at the same
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Step 6: Once again when torque reaches -10 Nm, i.e. 0 V, the motor should stop.
Step 7: Repeat 'Step 2' to 'Step 6' 3 times.
Step 8: Reset motor postion.
Till now I have managed to get the motor to move forward n backward @ a desired vel, accl, n deceleration for 3 cycles. I am attaching my code. I am having problem inserting the code for reading DAQmx amidst all this. Can anyone help me out.
Thnks,
Sasi.
Solved!
Go to Solution.
Attachments:
Test_012609.vi ‏35 KB

Hi Sasidhar,
I took a look at your problem and I think I have a workable solution for you. I definitely agree with Lynn's suggestion of using parallel loops. This will allow the DAQmx portion to run uninhibited by the motion portion, and vice versa. Plus, you only need to iterate the motion loop whenever the voltage level crosses a threshold. So, by iterating on the motion code in the same loop that you are iterating on DAQmx code, you are essentially wasting processor.
I created a VI that should do what you are wanting. I tested it out myself and it works great. You might have a tweak a few things to apply to your system (like motion board ID and DAQmx physical channel, etc.). I used two parallel loops and event-based programming. Basically the motion loop starts the motor spinning at the specified velocity. Once the motor is spinning, it waits for the DAQmx loop to tell it that the voltage value has crossed the threshold. When the voltage value exceeds the maximum threshold (which I set to a value slightly less than 10 to allow for jitter and saturation), the DAQmx loop signals the motion loop that it can finish its iteration. The motion loop stops the motion, reverses the direction, and starts the motion again. Once motion has started, it again waits for the DAQmx loop to tell it that a threshold has occurred, but this time, it is looking for a minimum threshold. I used "Occurrences" to implement the event-based programming in LabVIEW.
I have commented the code rather thouroughly, so hopefully the comments will answer any remaining questions. The benefit of using event-based programming for this is that you save processor time, and your motion is more closely synchonized with the DAQmx. Instead of iterating the motion loop as fast as you can, checking for updates each time, you just pause it, and wait for the other loop to tell you when to start up again. In the mean time, the processor doesn't have to worry about iterating that loop over and over again. Also, when the occurrence does occur, you catch it immediately, instead of having to wait until the next iteration. Thus, you are more closely synchronized with the DAQmx portion of the code.
I hope this will help you. Please post back if you have any questions about the code or its implementation. Good Luck!
Message Edited by Wes P on 02-03-2009 05:18 PM
Wes P
Certified LabVIEW Developer
Attachments:
Motion and DAQ.vi ‏59 KB
DAQmx Loop.png ‏24 KB
Motion Loop.png ‏17 KB

ORA-25307: Enqueue rate too high, flow control enabled

I am stuck. I have my stream setup and they were previously working on two of my dev environments well. Now when I get the streams setup the CAPTURE process has a state of "CAPTURING CHANGES" for like 10 seconds and then changes to state "PAUSED FOR FLOW CONTROL". I believe this is happening because the PROPAGATION process is showing an error of "ORA-25307: Enqueue rate too high, flow control enabled".
I don't know what to tweak to get rid of this error message. The two environments are dev databases and there is minimal activity on them so i don't think it's a case of the APPLY process is lagging behind the PROPAGATION process. Has anyone run into this issue?? I've verified my db link works, my stream admin user has dba access. Any help or advise would be greatly appreciated.
thanks, dave

As rule of thumb, you don't need to set GLOBAL_NAME=TRUE as long as your are 100% GLOBAL_NAME compliant.
So, setting GLOBAL_NAME=TRUE will not have any effect if your dblink is not global_name compliant
and if your installation is global_name compliant, you don't need to set GLOBAL_NAME=TRUE.
The first thing when you diagnose is to get the exact facts.
Please run this queries both on source and target so that to see what are in the queues and where.
Run it multiple time to see if figures evolves.
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- if they are not fixed then your apply really lag behind for what ever good reason, but this is usually easy to find.
set termout off
col version new_value version noprint
col queue_table format A26 head 'Queue Table'
col queue_name format A32 head 'Queue Name'
select substr(version,1,instr(version,'.',1)-1) version from v$instance;
col mysql new_value mysql noprint
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col secondary_instance format 9999 head 'Sec|inst'
col owner_instance format 99 head 'Own|inst'
COLUMN MEM_MSG HEADING 'Messages|in Memory' FORMAT 99999999
COLUMN SPILL_MSGS HEADING 'Messages|Spilled' FORMAT 99999999
COLUMN NUM_MSGS HEADING 'Total Messages|in Buffered Queue' FORMAT 99999999
set linesize 150
select case
when &version=9 then ' distinct a.QID, a.owner||''.''||a.name nam, a.queue_table,
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How to implement autotuning pid in labview in flow control process????

I tried the same way as Example available in LabVIEW..... that is general auto PID simulator... But that didn't worked out for me.....

The 'General Auto PID Simulator.vi' example uses the technique "PID Relay" feedback where it tries to calculate the PID values based on the relay feedback, but using the PID also in the loop:
(http://zone.ni.com/reference/en-XX/help/370401H-01/lvpidmain/pidrelay_alg/)
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C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\control\PID\Autotuning PID Online.vi
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Hi,
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Streams Help - Stuck in PAUSED FOR FLOW CONTROL

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