Acquisition of data high-speed with time stamp

Similar Questions

• acquisition of data high-speed and simultaneous sampling

  I'm quite familiar with the coding for NOR-DAQ boards in Labview. What worries me with labview, is that each tick is about milliseconds. I intend to retrieve the data simultaneously from 32 channels at 2 MS/s/chan using SMU 6368 s. Wouldn't not possible to enter data, on average 20 to 50 samples to get a unique value, perform simple algebraic manipulations on it and send it to the PC / software to approximately tens of kHz? We already have labview code to perform similar tasks, but it is quite slow and limiting the rate of experience. I said that Simulink is slightly better than Labview in this regard, but suffers a poor user interface and that if something C/C++ offers the ability to perform at high speeds with the same cards OR data acquisition. Could someone advise me please on this issue?

  You can use your PC! You can use a PCI/PCI-e card as the interface to your computer and it should work perfectly. Take a look at these pages (http://sine.ni.com/nips/cds/view/p/lang/en/nid/10389) for more information.

• Rough terrain when the data is plotted with time stamp of AM / PM or to the right!

  Hi to all programmers.

  I'm attached Datafile. Can someone tell me how to draw this line! I need all of the data plotted on the right and the x - axis with the date and time stamp.

  I understand that the chart cannot understand that after the time: 12:59:59.999, it's 01:00:00.000 afternoon.

  Thanks to Labview 7.1

  Concerning

  HFZ

  Apart from a code that can be simplified by the use of other functions, what I see, it's that the file you provided does not match the format that expects the VI.

  Other comments:

  • I don't understand why you're going to all the trouble of the evolution of the time string when all what you need to do is:

    

  • All the way at the beginning, use the function of path of the band to get the file name rather than the gymnastics that you're doing.
  • Your time loop must be indexed for auto-loop.
  • I can't quite understand what you're trying to do with all these sliders.

• A few days, I bought a mac mini which I transferred the data and programs with time machine: programs have been updated except for iMovie, and now it seems that I have to pay for the update: possible? What I am doing wrong?

  A few days ago, I bought a mac mini and I transferred all my data and programs with time machine: all programs have been updated but iMovie (7.1.4)... However, it seems that, to update to the latest version, I have to pay to download on Appstore: is it possible? what I am doing wrong?

  If it were a new mac mini, you need already installed 10.1 iMovie.  Otherwise, but you already have iMovie 9 registered version to your Apple ID, you can upgrade to version 10 for free, but if (as it appears) is an earlier version then you have to buy version 10.

  Geoff.

• Use two assistants for the acquisition of data at the same time

  Hello

  I want to read multiple data channels of analog inputs on my DAQ hardware. However, when I try to create two separate data acquisition assistants for each entry, it gives an error saying "is reserved for the specified resource. The operation could not be performed as indicated "." Can't use two assistants for the acquisition of data at the same time?

  I have to add different channels in the same assistant DAQ? I tried, but I couldn't separate the data in different graphs.

  How does this work?

  Kind regards

  Allard

  You can't have multiple tasks of the same type (in this case inputs analog) on the same device.  Just so having 1 DAQ Assistant read all your channels and separate your channels for individual transformation.

• Check out when a last accessed table (select, insert, update) with time stamp. Auditing enabled

  Hello world

  IM pretty new to audit the database. Auditing is enabled in the database. I would like to retrieve the news all of the objects belonged to a certain pattern when it was last accessed (select, insert, update) with time stamp. Is there any script for this? Your time and your reply is greatly appreciated. Thank you.

  Database version: 11.2.0.4

  Enable audit is not quite enough to get the details when the table is updated/inserted/selected.

  You must activate audting on the object level, then you may only be able to see your report of your choice.

  SELECT OBJ_NAME, ACTION_NAME, to_char (timestamp, ' dd/mm/yyyy, hh') of sys.dba_audit_object.

• PDM Viewer do not display data with time stamp

  Need help with the timestamp of the data in a PDM file generated by the DAQ Assistant.

  When I use the PDM Viewer, with x the value absolute time scale, the date starts in 1903. If I use Excel to look at the file that the start time is correct (i.e. 2013).

  Bo_Xie, I simplified my VI and now able to display the correct time stamp. Thanks for your time!

• overloading a DATE with time STAMP function to avoid the "too many declarations.

  CREATE OR REPLACE PACKAGE util
  AS
    FUNCTION yn (bool IN BOOLEAN)
      RETURN CHAR;
  
    FUNCTION is_same(a varchar2, b varchar2)
      RETURN BOOLEAN;
  
    FUNCTION is_same(a date, b date)
      RETURN BOOLEAN;
  
    /* Oracle's documentation says that you cannot overload subprograms
     * that have the same type family for the arguments.  But, 
     * apparently timestamp and date are in different type families,
     * even though Oracle's documentation says they are in the same one.
     * If we don't create a specific overloaded function for timestamp,
     * and for timestamp with time zone, we get "too many declarations 
     * of is_same match" when we try to call is_same for timestamps.
     */
    FUNCTION is_same(a timestamp, b timestamp)
      RETURN BOOLEAN;
  
    FUNCTION is_same(a timestamp with time zone, b timestamp with time zone)
      RETURN BOOLEAN;
  
    /* These two do indeed cause problems, although there are no errors when we compile the package.  Why no errors here? */
    FUNCTION is_same(a integer, b integer) return boolean;
  
    FUNCTION is_same(a real, b real) return boolean;
  
  END util;
  /
  
  CREATE OR REPLACE PACKAGE BODY util
  AS
    /********************************************************************************
       NAME: yn
       PURPOSE: pass in a boolean, get back a Y or N
    ********************************************************************************/
    FUNCTION yn (bool IN BOOLEAN)
      RETURN CHAR
    IS
    BEGIN
      IF bool
      THEN
        RETURN 'Y';
      END IF;
  
      RETURN 'N';
    END yn;
  
    /********************************************************************************
       NAME: is_same
       PURPOSE: pass in two values, get back a boolean indicating whether they are
                the same.  Two nulls = true with this function.
    ********************************************************************************/
    FUNCTION is_same(a in varchar2, b in varchar2)
      RETURN BOOLEAN
    IS
      bool boolean := false;
    BEGIN
      IF a IS NULL and b IS NULL THEN bool := true;
      -- explicitly set this to false if exactly one arg is null
      ELSIF a is NULL or b IS NULL then bool := false;
      ELSE bool := a = b;
      END IF;
      RETURN bool;
    END is_same;
  
    FUNCTION is_same(a in date, b in date)
      RETURN BOOLEAN
    IS
      bool boolean := false;
    BEGIN
      IF a IS NULL and b IS NULL THEN bool := true;
      -- explicitly set this to false if exactly one arg is null
      ELSIF a is NULL or b IS NULL then bool := false;
      ELSE bool := a = b;
      END IF;
      RETURN bool;
    END is_same;
    
    FUNCTION is_same(a in timestamp, b in timestamp)
      RETURN BOOLEAN
    IS
      bool boolean := false;
    BEGIN
      IF a IS NULL and b IS NULL THEN bool := true;
      -- explicitly set this to false if exactly one arg is null
      ELSIF a is NULL or b IS NULL then bool := false;
      ELSE bool := a = b;
      END IF;
      RETURN bool;
    END is_same;
  
    FUNCTION is_same(a in timestamp with time zone, b in timestamp with time zone)
      RETURN BOOLEAN
    IS
      bool boolean := false;
    BEGIN
      IF a IS NULL and b IS NULL THEN bool := true;
      -- explicitly set this to false if exactly one arg is null
      ELSIF a is NULL or b IS NULL then bool := false;
      ELSE bool := a = b;
      END IF;
      RETURN bool;
    END is_same;
  
    /* Don't bother to fully implement these two, as they'll just cause errors at run time anyway */
    FUNCTION is_same(a integer, b integer) return boolean is begin return false; end;
    FUNCTION is_same(a real, b real) return boolean is begin return false; end;
    
  END util;
  /
  
  declare
   d1 date := timestamp '2011-02-15 13:14:15';
   d2 date;
   t timestamp := timestamp '2011-02-15 13:14:15';
   t2 timestamp;
   a varchar2(10);
   n real := 1;
   n2 real;
  begin
   dbms_output.put_line('dates');
   dbms_output.put_line(util.yn(util.is_same(d2,d2) ));
   dbms_output.put_line(util.yn(util.is_same(d1,d2) ));
   dbms_output.put_line('timestamps'); -- why don't these throw exception?
   dbms_output.put_line(util.yn(util.is_same(t2,t2) ));
   dbms_output.put_line(util.yn(util.is_same(t,t2) ));
   dbms_output.put_line('varchars');
   dbms_output.put_line(util.yn(util.is_same(a,a)));
   dbms_output.put_line(util.yn(util.is_same(a,'a')));
   dbms_output.put_line('numbers');
   -- dbms_output.put_line(util.yn(util.is_same(n,n2))); -- this would throw an exception
  end;
  /

  Originally, I had just the a function with the arguments of VARCHAR2. It worked not correctly because when the dates were gone, the automatic conversion into VARCHAR2 lowered the timestamp. So, I added a 2nd function with the arguments to DATE. Then I started to get "too many declarations of is_same exist" error during the passage of time stamps. This made no sense to me, so, although documentation Oracle says you can't do this, 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. Therefore, the fourth version of the function. Docs of the Oracle say that if your arguments are of the same family, you can't create an overloaded function, but in the example above shows, it's very bad.
  
  Finally, just for grins, I created the functions of number two, one number, the other with REAL and even these are allowed - they are compiled. But then, at runtime, it fails. I'm really confused.
  
  Here's the apparently erroneous Oracle documentation on this subject: http://docs.oracle.com/cd/B12037_01/appdev.101/b10807/08_subs.htm (see overload subprogram names) and here are the different types and their families: http://docs.oracle.com/cd/E11882_01/appdev.112/e17126/predefined.htm.
  
  Published by: hot water on 9 January 2013 15:38
  
  Published by: hot water on 9 January 2013 15:46

  >
  So, I added a 2nd function with the arguments to DATE. Then I started to get "too many declarations of is_same exist" error during the passage of time stamps. It makes no sense for me
  >
  This is because when you pass a TIMESTAMP Oracle cannot determine whether to implicitly convert to VARCHAR2 and use your first function or implicitly convert to DATE and use your second function. Where the "too many declarations" error exist.
  >
  , 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.
  >
  Therefore, the fourth version of the function. Docs of the Oracle say that if your arguments are of the same family, you can't create an overloaded function, but in the example above shows, it's very bad.
  >
  I think that the documentation, of the family of 'date', is wrong as you suggest. For WHOLE and REAL, the problem is that those are the ANSI data types and are really the same Oracle data type; they are more like "alias" that different data types.

  See the doc of SQL language
  >
  ANSI SQL/DS and DB2 data types

  The SQL statements that create tables and clusters allows also ANSI data types and products IBM SQL/DS and DB2 data types. Oracle recognizes the ANSI or IBM data type name that differs from the Oracle database data type name. It converts the data type for the equivalent Oracle data type, stores the Oracle data type under the name of the column data type and stores the data in the column in the data type Oracle based on the conversions listed in the following tables.

  INTEGER NUMBER

  INT

  SMALLINT
  NUMBER (38)

  FLOAT (Note b)

  DOUBLE-PRECISION (Note c)

  REAL (Note d)
  FLOAT (126)

  FLOAT (126)

  FLOAT (63)

• file lvm recorded with time stamp graphic display

  Hello

  I have headaches display my data with correct timestamp. There are so many methods to save the data. Here, I decided to save it in a text delimited as lvm. a screenshot of my vi segment is attached. I want to use this way rather than other methods is the flexibility it offers. I'll be able to add more data to store that I develop the vi. (So I'm storing data of the DAQ assistant and my calculated values.) I've attached a screenshot of the file I also read.

  I would use another vi to open this file and it draw a chart/graph to show a trend of the acquired data. Can someone pls Advisor mid on which is a better way for mi to do?

  Thank you very much!

  POH

  Hi Malou,

  Sorry for the late reply, I was rushing to complete my project, has not been able to answer.

  Yes, I managed to solve it. In any case, I've used this high rate in the acquisition of data wizard is to allow the acquisition of continuous mode & use a software filter instead of filter material. However writes to the folder this way - write string in .lvm, max is 10 samples/s unless I have use tdm (I'll then everything in the newspaper).

  I was not able to display the correct timestamp was due to the fact that I have does not add to the timestamp of the start time for the timestamp in waveform display. I won't be able to go down to my lab, & my machine have no LabVIEW, so what I do is to extract some parts of my report to share.

  For the part that I used to display the graph (can be seen on the attachment), I deleted the 1st column, which is the time stamp (for display of the spreadsheet), but extract the 1st element - convert timestamp DBL it when I start recording in the DAQ vi (written with the header).

  This excerpt (which could be considered as a group of numbers in the file lvm) and converted to the type timestamp and wired for generating waveform block, providing the start time of the wave.

  Then I replace the use of the chart with graphic, graphic is suitable for data acquired and graphic tracing is better for the time of execution of the data display. now it seems to work fine for me, except for the load time may take some time for larger files.

  Thank you for your participation in this thread!

  See you soon!

  POH

• A measure of speed high speed with encoder in quadrature and NI 9401 on cDaq

  Greetings,

  We use an encoder in quadrature with 360 pulses/turn on the tracks (track A and B) and no trace of Z to measure motor speed at startup. Data acquisition, we use a NI 9401 in 9178 cDaq chassis and a pc with LabVIEW. The problem is that the start-up period is relatively short (less than 1 second), during which we measure speed as precisely as possible. The speed range is from 0 to 10000 RPM.

  What type of measurement method that you would recommend.

  Here are a few methods that we have already tried:

  -Measure with DAQmx CIFreq--> high frequency with 2 counters: speed measurement, but with a very big mistake (+ 166 RPM).

  -CIFreq DAQmx--> wide range with 2 counters: good speed data but more slow measurement,

  -CICntEdges DAQmx (counting separated the two lanes, speed conversion): very incoherent speed data.

  Thanks in advance for your help.

  Matej

  I would definitely say a 4, the measure of a low freq called option with 1 meter.  (Frankly, I've never been

  fond of this name because it is useful for freqs much higher than what I expect most people think "low freq".)   This

  is the method that I almost * always * use for frequency of counter measures.  It works really well to capture transitional

  variations in speed.

  10000 rpm and 360 cycles/rev, you are looking at a maximum frequency of 60 kHz.  The frequency measurement mode 1 meter

  There will be 80 MHz internal clock by encoder cycle edges, then you will get more than 1000 strokes per measure.  The point

  that means only 1 number of quantization errors, you can expect<>

  Further, you can average overall, say, 10 samples to you give even better accuracy and you could still be a data capture

  rate significantly higher than the probable bandwidth of your mechanical system.  (The average would just clean the jitter and noise and would not

  Hide answer true mechanical characteristics).

  -Kevin P

• Super High speed internet Time Warner installed (50mbps) but foxfire operating only at 1.35Mbps, while the internet Explorer works fine

  Internet (50mbps) Time Warner installed high-speed yesterday on my computer, but when the guy left I noticed that the speed was very slow. SIS one test on speedtest.net and found I was getting a maximum of 1.35mbps (sometimes as low as .62mbps). So I had them come back and they tried all kinds of things, only to discover Internet Explorer gets 50mbps, so it's something with Foxfire. What would it be?

  Hello, when you use speedtest.net or a similar site based on flash to measure your connection speed, it could be a problem with the protected mode that adobe has implemented for its flash plugin for firefox. Some older versions of f-secure or report of trusteer are known to cause slowdowns with flash, or it could be something similar on your system that interferes (maybe security software that block/sandbox the container used for protected mode, etc...).

  as a solution, you could try downgrading of 10.3 flash (which is always supported) or Disable protected mode & see if that makes a difference.

• T3i sync high speed with popup flash?

  When shooting outdoors with a light background, it would be nice to be able to use the flash pop-up as a fill light (to the shadows on a face, etc..). However, the shutter speed is set to 1/200 when the popup flash is in place, overexpose the scene. Is there a reason why the pop-up flash can't sync high speed like an external flash to allow a faster shutter speed and always get a filling?

  Thank you

  David

  It has to do with the amount of energy is available for the flash.  A more powerful flash can more easily manage the sync high speed.

  Sync and sync high speed are related to the work the Shutter curtain on any SLR digital.  There are two doors.  A slides open, and close other slides.  The reason for which there must be two doors (instead of one) is because that if there is only one, then the door would slide open, then reverses to slide.

  Assume the following scenario were true:

  Suppose it takes the shutter a full 1 second door to slide open.  If we set an exposure time of 2 seconds, the following should happen if there was only one door.

  -l' shutter starts to slide open from left to right, allowing light to reach the pixels on the left edge of the sensor.  The right edge is always in the dark.

  -as slides of doors, more and more pixels are eposed to light.

  -a second later reached the opposite end and all the pixels are exposed to light, but the door must immediately reverse and start close because it will take a full second to slide the door closed.

  -the door begins to move and immediately the pixels on the edge of most on the right are in the dark, because they are covered by the shutter, but the pixels on the left edge are still exposed to the light.

  -the door has finally reached the edge against a second later and no pixel is exposed to light.

  Think to what just happened... the pixels on the edge of 'left' of the sensor got a second exhibition 2... but the pixels on the right edge of the probe were barely exposed for a fraction of a second.  You'd have a horrible blow to look.

  To resolve this problem, the camera uses TWO doors... begins a sliding open... the other follows a moment later (based on the selected shutter speed) and starts sliding closed.  Now, all pixels are exposed for the same period of time, regardless of the shutter speed you use.

  But the reality is they are mechanically sliding doors and it takes time to move.  Flash sync speed is shortest possible exposure that can be turned where the first door has enough time to COMPLETELY slide open so that when the flash goes off, the entire sensor is exposed and benefit of lightning.  The second door can slide THEN closed.

  If you do not use flash and you set a very fast shutter speed (say 1/1000th) the second door actually starts closeing long before the end of the first door opening.  In fact the second door is "hunting" the first establishes a "slot" which sweeps the sensor.

  With this in mind... now think just what a flash how to predict sync high speed.

  Assume that your camera has a maximum speed of flash-sync of 1/200th, but you want to shoot at 1/400th.

  This means that the first door must begin to open.  When he reached the midpoint, the flash must trigger to light the subject - but half the sensor did not lightning.  The second door closes as the first door continues to open up.  When the first door reaches the opposite edge, the second door will now be in the middle.  The flash needs to fire AGAIN - this time to expose the pixels on the 2nd half of the sensor.

  This means that the flash should fire TWICE in quick succession and the impulses must be PRECISELY 1/800th second (half or your second 1/400th total exposure times) apartment.    No flash would be able to recycle in just 1/800th dry if she gave a burst of the power of the light.  In other words, that it must reserve at least half of its power for the second round.

  If you increase the shutter speed to 1/800th... now the flash to trigger FOUR times and no single burst may be stronger than 25% of the power of lightning - and gusts must precisely timed occurs 1/1600e seconds, independently of the other.

  You can quickly see how this is going to require a flash with a power or you won't be able to finish the sync high speed on something more than just a few feet.

  For the light of day, the most brilliant exhibition is going to be the sunny 16 rule... f/16 with the shutter speed, the value in contrast to ISO.  So, for 100 ISO, you can use 1/100th sec.  To f/8, you can use 1/200th (and now you are still below the max flash sync speed).

• BEFORE the UPDATE of relaxation with time stamp does not work as expected

  We have a scenario where I check update operations on a table.

  I created a before update TRIGGER, so that every time he goes an update on the main table statement, one before the image of the lines is captured in the table of audit with timestamp.

  Since it is before updating, ideally the audit table timestamp (TRG_INS_TMST) should be less main table timestamp (IBMSNAP_LOGMARKER) VALUE, I mean TRIGGER should happen before the update.

  (I could understand in a way that the UPDATE statement is formulated with SYSTIMESTAMP earlier before the TRIGGER is evaluated and so UPDATE is to have a time stamp prior to TRIGGER, but this isn't what we wanted. We want PRIOR update)

  'Table' IBM_SNAPOPERATION IBM_SNAPLOGMARKER            
  ---- ----------------- -------------------------------
  T1   U                 13-OCT-15 03.07.01.775236 AM   <<---------- This is the main table, This should have the latest timestamp
  T2   I                 13-OCT-15 03.07.01.775953 AM
  

  Here is my test case.

  DELETE FROM TEST_TRIGGER_1;
  
  DELETE FROM TEST_TRIGGER_2;
  
  SELECT 'T1', ibm_snapoperation, ibm_snaplogmarker FROM TEST_TRIGGER_1
  UNION
  SELECT 'T2', ibm_snapoperation, TRG_INS_TMST FROM TEST_TRIGGER_2;
  
  INSERT INTO TEST_TRIGGER_1 (ID,ibm_snapoperation, ibm_snaplogmarker)
       VALUES (1, 'I', SYSTIMESTAMP);
  
  COMMIT;
  
  SELECT 'T1', ibm_snapoperation, ibm_snaplogmarker FROM TEST_TRIGGER_1
  UNION
  SELECT 'T2', ibm_snapoperation, TRG_INS_TMST FROM TEST_TRIGGER_2;
  
  UPDATE TEST_TRIGGER_1
     SET IBM_SNAPOPERATION = 'U', ibm_snaplogmarker = SYSTIMESTAMP;
  
  COMMIT;
  
  SELECT 'T1', ibm_snapoperation, ibm_snaplogmarker FROM TEST_TRIGGER_1
  UNION
  SELECT 'T2', ibm_snapoperation, TRG_INS_TMST FROM TEST_TRIGGER_2;
  

  Def trigger:

  CREATE OR REPLACE TRIGGER etl_dbo.TEST_TRIGGER_1_TRG BEFORE UPDATE OF IBM_SNAPOPERATION
  ON TEST_TRIGGER_1 REFERENCING OLD AS OLD NEW AS NEW
  FOR EACH ROW
  WHEN (
  NEW.IBM_SNAPOPERATION= 'U'
        )
  DECLARE
  V_SQLCODE  VARCHAR2(3000);
  --PRAGMA AUTONOMOUS_TRANSACTION;
  BEGIN
  INSERT INTO etl_dbo.TEST_TRIGGER_2
  (ID,
  IBM_SNAPOPERATION,
  IBM_SNAPLOGMARKER,
  TRG_INS_TMST
  )
  VALUES (:OLD.ID,:OLD.IBM_SNAPOPERATION,:OLD.IBM_SNAPLOGMARKER,SYSTIMESTAMP)
  ;
  --COMMIT;
  END;
  /
  

  Output is something like this

  1 row deleted.
  1 row deleted.
  no rows selected.
  1 row created.
  Commit complete.
  
  'T1' IBM_SNAPOPERATION IBM_SNAPLOGMARKER            
  ---- ----------------- -------------------------------
  T1   I                 13-OCT-15 03.07.00.927546 AM 
  1 row selected.
  1 row updated.
  Commit complete.
  
  'T1' IBM_SNAPOPERATION IBM_SNAPLOGMARKER            
  ---- ----------------- -------------------------------
  T1   U                 13-OCT-15 03.07.01.775236 AM   <<---------- This is the main table, This should have the latest timestamp
  T2   I                 13-OCT-15 03.07.01.775953 AM 
  
  2 rows selected.
  

  But for some reason, even after the creation of the 'AFTER' trigger for update, it works as expected. Sense - the main table is not having the last timestamp given

  It's OKAY - I told you in my reply earlier. Reread my answer.

  could understand somehow that the UPDATE statement is made with earlier

  SYSTIMESTAMP until the TRIGGER is assessed and updated so is to have

  time stamp prior to the trigger, but this isn't what we wanted. We want to

  BEFORE the update)

  As I told you before that your UPDATE statement occurs BEFORE the trigger is activated.

  Despite what the other speakers have said, it makes NO DIFFERENCE if you use a BEFORE UPDATE or an AFTER UPDATE trigger. Your UPDATE statement runs ALWAYS BEFORE the trigger.

  HE has TO - it's your update processing statement that causes the trigger to fire.

  Your update statement includes SYSTIMESTAMP. If during the processing of your return to update the value of SYSTIMESTAMP "at this exact time" is captured.

  Then your trigger is activated and starts to run. ANY reference to SYSTIMESTAMP that you use in your trigger cannot be earlier than the value of until the trigger was executed. It's IMPOSSIBLE.

  The trigger can use the SAME value by referencing: NEW and the column name you store the value. Or the trigger can get its own value that your code is doing.

  But the SYSTIMESTAMP value in the trigger will NEVER earlier than the value in your query.

  And none of these values can actually be used to tell when the changes are really ENGAGED since the trigger does not work and CAN NOT, to know when, or if, a validation occurs.

  Reread my first answer - he explains all this.

• record in the table with time stamp

  Hello
  I use Forms6i and db 10g
  I have a datablock in my form, which is based on a table hlp_user_master.
  The table has fields crt_on, upd_on. who is date type.
  Now I'm set sysdate to these areas, before saving it to the database.
  He is now in the database, just.
  But I want it to be like date with the time.
  My Manager said to set the data type of the fields in the form.
  I did the DateTime data type, in the form
  but still in the database, just when saving
  
  Help, please

  Hello
  If you have changed in the form of the datetime data type and the mask format as I said in my previous post. Then, the database will have time also after saving it. I guess that you are checking in via SQL * more. If so, try the following query.

  SELECT TO_CHAR(DATE_COLUMN,'DD-MON-YY HH24:MI:SS');
  FROM TABLE_NAME;
  

  If the form is stalling as it will display then with time.

  -Clément

• Slow response from the user interface with acquisition of data of type long time

  Hi all

  I have a question to ask more out of curiosity than necessity right now. I've built a program that acquires data from the accelerometer and the Treaty in a number of ways: filtering, FFT, FRFS, things like that, but the answer of the UI is still slow, because I need a resolution of frequency of 0.2 Hz for my data domain, which means that the sample acquisition time is 5s and all this awaits before execution.

  My question is this: is there a way to completely isolate the user interface of data acquisition so that it responds immediately?

  I tried a design model of producer consumer with queues, but found everything to be always waiting for samples to be taken. Maybe it was exactly as I did.

  Thank you

  Phil

  If you need to sample for 5 seconds in order to have enough data to analyze, so unless you can "predict the future" and "knowing" the five seconds of data, simply wait for the data that arrives.  Using parallel loops of producer-consumer will allow data acquisition to proceed (for the next 5 seconds of data) while you do the analysis, but you still have to wait for the data to be analyzed.

  Note that the previous paragraph assumes you are collecting data in 5 seconds 'chunks' and analyze each "chunk" (independent) on arrival.  You could also do something like having a "second 5 sliding window" which moves, say, a second at a time, giving your FFT a finer resolution of 'time' (at the expense of their independence).  This would be a (slight) change in your loop of producer (you want to taste in 1 second pieces, accumulate 5 these pieces) and the consumption loop (start analyzing, spewing a FFT every second, while replacing the older "chunk" with the most recent - a queue with loss can do for you).

  Bob Schor