AnalogWaveform example of tracing

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• AnalogWaveform - problem of memory over time?

  I need to implement multiple graphs, each with a unique set of data.

  WPF, data application is related in an AnalogWaveform proberty XAML.

  For as far as I can see there's no opportunity to clear or reset the AnalogWaveform, if it grows and bigger with time, until that all memory is fed up. (See the example of a link on the next page)

  http://zone.NI.com/reference/en-XX/help/372636F-01/mstudiowebhelp/HTML/wpfgraphplotting/#DataSource

  1. Why is there not a clear option for that? How can I reset without creating a new AnalogWaveform

  2. any other chance to bind data via xaml to NEITHER: Graph?

  Link doesn't seem to work, affecting only "Chart1. Data source"in code-behind will result in a visible plot.

  The example that you have accessed to seeks to demonstrate binding data with the least amount of code possible. With the help of analogWaveform.Append integrated of the waveform change notification is used to warn the new data graphic. However, as you have found, just creates a wave of increasingly wider, leading to memory problems.

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  public partial class MainWindow : Window, INotifyPropertyChanged {

        private AnalogWaveform analogWaveform;

  public MainWindow( ) {

            InitializeComponent( );

            graph1.DataContext = this;

        }

  public AnalogWaveform Data {

            get { return analogWaveform; }

            set {

                analogWaveform = value;

                PropertyChanged( this, new PropertyChangedEventArgs( "Data" ) );

            }

        }

  public event PropertyChangedEventHandler PropertyChanged = delegate { };

  private void button1_Click( object sender, RoutedEventArgs e ) {

            Random random = new Random( );

  int pointCount = 100;

            double[] data = new double[pointCount];

            for( int i = 0; i < pointcount;="" ++i="">

                data[i] = random.NextDouble( );

  Data = AnalogWaveform.FromArray1D( data );

        }

    }

  You can also expose Data as a dependency property in this example, that would manage the notification of changes automatically.

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• Add data to an [existing] the AnalogWaveform < Double >

  Hello

  I'm the life-long tension using DAQmx scene, and I am puzzled as to how I can add new samples in an existing array of waveform.  Whenever I run my program, I receive only 1000 samples of data in the AnalogWaveformarray.  Because I need to do some calculations after each asynchronous reading, I wish I had the waveform table 'accumulate' data until the acquisition stops.  Then, I can trace the entire waveform.  Is this even possible, or do I just store the data in a WaveformPlot?  Any suggestion would be appreciated.  Thank you!! Here's my code for callback:

  public void ReadCallBack_MeteringTask (IAsyncResult ar)
  {
  Try
  {
  If (runningTask is ATR AsyncState)
  {
  read data
  AnalogWaveformof the waveforms [] = daqReader.EndReadWaveform (ar);

  cancel the acquisition if channel trigger is not valid
  If (triggerChannelIndex < 0="" ||="" triggerchannelindex=""> = meteringTask.AIChannels.Count)
  {
  meteringTask.Dispose ();
  runningTask = null;
  System.Windows.Forms.MessageBox.Show ("Invalid trigger channel index.");
  return;
  }

  continue to acquire data until the short-circuit has been detected
  shortCircuitInitiated = IsShortCircuitInitiated (waveforms, triggerChannelIndex, desiredLevel);
  If (shortCircuitInitiated)
  {
  short circuit detected, read more and stop acquisition
  daqReader.MemoryOptimizedReadWaveform (desiredSamplesPerChannel, waveforms);

  Stop the task
  meteringTask.Dispose ();
  runningTask = null;
  return;
  }

  Read the next set of samples
  daqReader.BeginMemoryOptimizedReadWaveform (desiredSamplesPerChannel, callBack, meteringTask, waveforms);
  }
  }
  catch (DaqException ex)
  {
  meteringTask.Dispose ();
  runningTask = null;
  System.Windows.Forms.MessageBox.Show (ex) Message);
  }
  }

  Hi Eric,.

  Unfortunately, it seems that the AnalogWaveform data type has no the possibility of adding a waveform, mainly due to the uncertainty as how to manage with different timing waveforms.  In your case, since it is still the timetable, we should be able to piece together a solution.

  First of all, note that AnalogWaveform[] is an array of the data types AnalogWaveform returned by the function of data acquisition.  The table represents the number of channels that is to measure your task of acquisition.  This example I can give you is for a track, but you should be able to extrapolate in several channels.

  We must create a global variable of AnalogWaveform that will maintain the variable information.  Then, whenever your function will run, you must add the information of waveform at the end of the global variable.  Due to some restrictions in the type of data, we must do a few things to work around this problem, but hopefully the example code below is clear.  If it isn't, please answer any questions you may have.

  public AnalogWaveform = new AnalogWaveformglobalWaveform (0); //set to 0 because it is resized subsequently

  ....

  AnalogWaveformof the waveforms [] = daqReader.EndReadWaveform (ar);

  First, you must create a temporary variable waveform that is as large as the existing data stored in the global data as well as the size of incoming data

  AnalogWaveform tempWaveform = new AnalogWaveform(globalWaveform.Samples.Count + 100); //replace 100 with the known size of your waveform that you read in the previous step

  Then, you must copy the waveform timing information.  Given that your calendar information will not change, we can just do this copy every time your code runs

  tempWaveform.Timing = [0] of the waveforms. Calendar;

  tempWaveform.PrecisionTiming = [0] of the waveforms. PrecisionTiming;

  tempWaveform.ScaleMode = [0] of the waveforms. ScaleMode (ScaleMode);

  Then we need copy the existing data from the globalWaveform to the largest temporary variable.  This must be done because there is no way to add to the global variable.

  int index = 0;

  for (int j = 0; j)< globalwaveform.samples.count;="">

  {

  tempWaveform.Samples [index ++]. Value = globalWaveform.Samples [j]. Value;

  }

  Finally, it copies the data from the new waveform, read in the tempWaveform variable.  This means that tempWaveform is a local variable which contains the entire waveform.

  for (int k = 0; k)< waveforms[0].samples.count;="">

  {

  tempWaveform.Samples [index ++]. Value = [0] of the waveforms. Samples [k]. Value;

  }

  The last step was we do globalWaveform repoint towards the entire waveform.  When this function is out of reach, the data will always exist because globalWaveform is pointing to it.

  globalWaveform = tempWaveform;

• AnalogWaveform time infromation

  I'm performing data acquisition in continuous mode through the Commission NI 6132 under DAQmx, using .NET (c#).

  Everythihng works perfectly, except that every time the AnalogWaveform acquired has exactly the same start time information!

  Each aqcuision files is triggered by the trigger. We must now correct time what relaxation occurs 5 times in the line and acquire some data (for example, 100 samples after trigger). Acquired samples are correct. It's the time for each record information

  For example, my back AnalogInCallback() function call is defined as follows, for the reading of 5 records of the same channel:

  AnalogWaveform[] buffer = new AnalogWaveform[5];

  int counter = 0;

  private void AnalogInCallback (IAsyncResult ar)
  {

  ...
  AnalogWaveform[] data_oneRecord = reader. EndReadWaveform (ar);

  buffer [counter] = data_oneRecord [0];

  counter ++;

  }

  When 5 folders should be acuired, the function above is callsed 5 times.

  The problem is that every time timing of waveform information are exactly the same, as the first time as well as for that of 5th.

  That is to say

  buffer [0]. Timing.StartTime is buffer [4]. Timing.StartTime

  I have egg information exact start time each folder!

  
  

• Tracing of the AMT will not turn on

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  1. don't you turn on track if only requested by oracle support to send the trace files?

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  Can I activate it and continue tracking?

  I am wanting to turn on tracing for more details on what's going on when I get this error TNS.  But since I apply this change sqlnet.ora, I see no longer the TNS errors.

  Thank you.

  greddy09sc wrote:

  The tns error reported in your alert log is probably transitory, and the fact that you don't see them is not necessarily bound by your changes in sqlnet.ora. In fact, I would say that they are absolutely not related.  Sqlnet.ora reached what is written in the newspaper alert databases. These posts are written by the database.  In sqlnet.ora configurations affect only what is written by the sqlnet layer itself.

  I consider the sqlnet.ora doc you mentioned above before this post.  They say that if:

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  which means that it will turn off right? :

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  This is what confused me.

  But the normal monitoring still occurs.  And the difference between "normal" and followed by "ADR" is not in what is traced, but where trace files are written and if there is no extra packaging that goes with it.  Tracing of ADR will add a file '.trm' and the file 'trc '.

  The AMT error may be transient alert.log after a change in sqlnet.ora.  You mention how they are absolutely not related. But I was getting 2-3 TNS error in the alert.log daily minimum. During the 4 days of this sqlnet.ora change I did not receive ANY TNS error.

  There are certainly times that a tns error may appear in the alerts log.  The database interacts with the network - especially when it acts as a client to a different database, via db link. If a network issue resulting occurs - as a result of the database - it will be reported back to the database, because the datbase was the process that requested services network.  But the sqlnet.ora is a configuration file for the network, not the database.

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  .....

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  Answer the questions:

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  2. to turn on tracing

  Under search support Oracle Oracle Data integrator, there is an information center that includes detailed instructions and examples (files) on how to configure tracing.

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  Hi all
  
  I want to using AWR sql tracing.
  
  But I can't find the hits in google for "AWR sql tracing.
  
  Kindly help what is the right keywords.
  
  
  Thank you very much.

  Hello

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• Question of recursion tracing

  Hello
  
  I tried to solve the eight Queens problem. My algorithm has too many lines and don't like it somehow. While searching for some ideas I've found recursion back channels. Interesting approach, compact and elegant.
  
  I read different explanations of what exactly it was, but when it came to implement in my code... Blocked for a few days (again). Reading more, I found this page (http://introcs.cs.princeton.edu/23recursion/) - explanations and examples with answers. Towards the end of the page, it's the same exercise that I was trying to solve (i.e. 21). Initially I didn't watch the answer since I was sure I was going to be able to implement tracing recursion to solve the eight Queens problem. After being struck a wall for a while, I realized that I can't be implemented. I did understand everything at a level that will allow me to implement.
  
  I won't give up. I took a different route (something that I didn't do) - I copied the answer (http://introcs.cs.princeton.edu/23recursion/Queens.java.html) and made the execution step by step to understand recursion back channels. I knew not that I understand it. Nope. I got more confused.
  
  To be precise-, I did not understand
  

  private boolean isConsistent(int q[], int n) {
          for (int i = 0; i < n; i++) {
              if (q[i] == q[n]){
                   return false;  
              }
              if ((q[i] - q[n]) == (n - i)){
                   return false;   
              }
              if ((q[n] - q) == (n - i)){
  
       return false; 
  
  }
  
  }
  
  return true;
  
  }
  
  
  void enumerate(int N) {
  
  int a[] = new int[N]; // Except this line - I know what it does
  
  enumerate(a, 0);
  
  }
  and 
  I understand this is the recursion back channels, but I do not understand exactly what
  happens and why
  private void list (int q [], int n) {}
  If (n == q.length) printQueens (q).
  else {}
  for (int i = 0; i < q.length; i ++) {}
  q [w] = i;
  If (isConsistent (n, q)) {}
  list (q, n + 1);
  }
  }
  }
  }
  When I was step-executing I tried N = 4 in order to look at simpler case. I understood that the author is using q[] to know what the position of the Queen is.
  
  But how is it done and most of all how the backtracking recursion is implemented is what I don't understand.
  
  Any help is greatly appreciated. Thanks in advance.
  
  Edited by: blias on Mar 8, 2011 2:52 PM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
  			 
  I'm sorry to say that I did not: most of my programming concepts have been drawn for decades with implementations in assembler and C. These books are long on the market, but I suggest you take a good look at some of the recursion on the web items. Read the articles in theory first, and then start watching implementations. I know it is very popular to look at implementing immediately by the discussion, but in many cases, it is because the author is unable to express a good explanation without 'images' to follow along with. I found it best get a nice intro and the understanding of the theory, then look at the discussions with implementations - it because it is much easier to look at the code if you are not trying to decypher what is supposed to be going on and see if the code is right at the same time.
  		   

• Tracing SQL

  Hi people
  
  Oracle 11.1.0.7
  
  Is it possible to trace the value retrieved from a select statement?
  
  for example instead of see the County recovered values (here r = 47), I would like to see all 47 lines with their values.
  
  FETCH #9:c = 1000, e = 0, p = 0, cr = 0, cu = 0, set = 0, r = 47, dep = 0, og = 1, plh is 1552592935, tim = 1271851659528802
  
  
  Is there a way to do this?
  
  Background: human application means that the db returns a value which should not be removed, and if I run the sql manually code the specific value is not returned. So, I want to follow the session of the application.
  
  Thank you
  
  Cordially oviwan

  Oviwan wrote:
  No, I'm looking for data that is transferred from the database to the application. I know the SESSION_TRACE_ENABLE procedure, but here you do not see the values of each record that is recovered as far as I know.

  I'll try it with the '12 10046 trace event' event tomorrow

  A 10046 level 12 trace (level 8 or 4) will not give you the information you want to see. Level 4 writes the bind variable definitions and values to a trace file, level 8 writes events to wait and level 12 wrote bind variables and wait events. A 10046 trace will not write the data returned by the database in a log file.

  An option that might work for you is to use a packet, like Wireshark capture utility. Wireshark has an option "follow stream" which re - will combine multiple TCP packets in a conversation that shows the statement SQL sent by the client and the raw data returned by Oracle. Another option is to allow a side client SQL * Net trace, see Metalink Doc ID 779226.1, 219968.1 and 395525.1. If the client computer is running on Windows, take a look at Metalink Doc ID 216912.1 to enable tracing in the batteries of different communication.

  Charles Hooper
  Co-author of "Expert Oracle practices: Oracle Database Administration of the Oak Table.
  http://hoopercharles.WordPress.com/
  IT Manager/Oracle DBA
  K & M-making Machine, Inc.

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