Time Stamp Offset end playback TDMS

I am having a problem with a PDM file playback and display a graphic in the shape of wave in LabVIEW.  My table of waveform display always the time with a negative offset of 18 000 samples.

Who make it simple, let's say I'm sampling to 1000 samples per second, and I connect my PDM data. When I read that PDM and visualize my graphic waveform data, the chart display data read from DDHN 18 seconds earlier that the registered wf_start_time, set a deadline for the PDM.  If my wf_start_time is 08:00:20.000 AM 12/02/2014, then my waveform displays a start time of 08:00:02.000 AM 12/02/2014.  Even if I taste 4000 samples per second, my start time is disabled starting 4.5 seconds earlier.

I put my Xscale.offset = wf_start_time it reads properly, but the start time on the waveform table is always false.

Because I'm dealing with large TDMS files (500 MB +), I sometimes decimate the data to view it due to problems of memory. Here, this problem occurs again.  If I decimate the data to display only 1 out of every 10 data points, this offset is more changing by a factor of 10 x. ranging from 18 seconds to 180 seconds.

Is this some sort of gap of stamp UTC/system clock time or something else?

Looks like that I thought about it.  I copy - paste a previous screw waveform graph on a whim, I created a graph of waveform from scratch, and the lag problem has been eliminated.  It must have been an option or shift created in there that I couldn't see or modify.  But it's good now.

Tags: NI Software

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

    >
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    NLS_TIMESTAMP_TZ_FORMAT JJ. MM YYYY HH24:MI:SSXFF TZR
    NLS_DUAL_CURRENCY €
    BINARY NLS_COMP
    NLS_LENGTH_SEMANTICS TANK
    NLS_NCHAR_CONV_EXCP FAKE

    17 Zeilen offiziell

    Rollback
    Rollback abgeschlossen.
    < / pre >

    Look at the strange data that stamp_copy was after the update.

    When run from SQL over, everything is fine. But when I run this code in our application, the same phenomenon occurs. I've even seen a data dating back to the year 11907 (!), giving an exception by selecting from the table.

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    Best regards

    Jürgen

    Did you check metalink for bugs?

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    http://hoopercharles.WordPress.com/2011/02/17/strange-timestamp-behavior/

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    12:43:04:651 09/09/2009

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    our production server is in the United States and the data entered through the India and business also

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    Use a procedure to have time ist

    now I can change the timestamp data type without affecting the data

    I think that its really need and it is not good to store the date in varchar

    the procedure I know to change the data type is as below


    1. Create Table smsrec_dup as select Rowid Row_Id, transaction_date sms_rec;


    2 update sms_rec Set transaction_date = Null;


    3.commit;


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    5 setting a day sms_rec B Set transaction_date = (Select transaction_date of smsrec_dup A where B.Rowid = A.Row_Id);


    6.commit;


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    AS

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    AS
    var_sign varchar2 (2);
    var_zone varchar2 (35);
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    BEGIN

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    IF var_zone = "+ 05:30 ' THEN"

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    dbms_output.put_line (actual);

    ON THE OTHER

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    ON THE OTHER

    Select
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    (to_number (substr (systimestamp, 31.2)) * 60 +)
    TO_NUMBER (substr (systimestamp, 34.2)) + 330)), "dd/mm/yyyy hh24:mi:ss")
    ||':'||
    TO_CHAR (systimestamp, 'ff3'),
    SYSTIMESTAMP
    real-time,.
    Double;

    dbms_output.put_line (actual);

    END IF;

    END;
    /


    and to call that trigger in

    as
    CREATE OR REPLACE TRIGGER 'TEST'.trg_tctn_dtinsrt_sms
    BEFORE INSERT ON sms_received
    FOR EACH LINE
    DECLARE
    VARCHAR2 (55) DT;
    BEGIN
    current_tstamp (DT);
    : new.transaction_date: = DT;
    END;

    Hello

    I just want to explain about this a bit...

    change time zone at the database level is quite a bad idea...
    because if you change the time zone then what about all the data that might be present in the same database used by other applications, as appropriate.
    I'm not sure, but if dbtimezone is changed so if you have date or timestamp columns with tables so the values inside of get them adjusted to the time zone has changed.

    first of all understand the diff between...

    If you use systimestamp (which is not really a timestamp data type appear perfectly what timestamp with time zone) must always dbtimezone time zone (as obtained from timezone database).

    You use localtimestamp (which is a timestamp data type) if the timestamp at the session that you set for him. by default, it will take the client's time zone.

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    SQL> alter session set time_zone='+05:30'
      2  ;
    
    Session altered.
    
    SQL>  select systimestamp,current_timestamp,localtimestamp from dual;
    
    SYSTIMESTAMP
    ---------------------------------------------------------------------------
    CURRENT_TIMESTAMP
    ---------------------------------------------------------------------------
    LOCALTIMESTAMP
    ---------------------------------------------------------------------------
    10-SEP-09 05.15.03.531687 AM -04:00
    10-SEP-09 02.45.03.531716 PM +05:30
    10-SEP-09 02.45.03.531716 PM
    
    SQL> alter session set time_zone='+04:30';
    
    Session altered.
    
    SQL> select systimestamp,current_timestamp,localtimestamp from dual;
    
    SYSTIMESTAMP
    ---------------------------------------------------------------------------
    CURRENT_TIMESTAMP
    ---------------------------------------------------------------------------
    LOCALTIMESTAMP
    ---------------------------------------------------------------------------
    10-SEP-09 05.15.39.840319 AM -04:00
    10-SEP-09 01.45.39.840350 PM +04:30
    10-SEP-09 01.45.39.840350 PM
    

    See above see you systimestamp does not change but current_timestamp and localtimestamp change with session timestamp...

    Until this is localtimestamp... speak frankly... it will get the time stamp of the client... If you use a sql developer then it will show the timestamp on your desktop... But in a 3-tier application... I mean applicationlayer-customer data base, the database client is application layer not the end user PC. He will get the time zone of the server application. So using timestamp with local time zone can be waived if you use 2-tier application or desktop.

    Here's the real story...
    So what I mean is that... This is the application layer send the time zone of the client to the database... If the database when inserting (indirectly, your willingness to insert queries) convert the timestamp to whatever you want...

    for example...
    I am inserting a record into the database table that has a timestamp data type... so... I inserted at 14:56 IST

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    1 row created.
    
    SQL> select col1 from test_tz;
    
    COL1
    ---------------------------------------------------------------------------
    10-SEP-09 05.25.41.497759 AM
    
    SQL> 
    

    If you see he showed he showed the time server by deleting the part of zone. Since then, you would like to insert in the TSI data then...

    SQL> truncate table test_Tz;
    
    Table truncated.
    
    SQL>  insert into test_tz(col1) values(systimestamp at time zone 'Asia/Calcutta');
    
    1 row created.
    
    SQL> select col1 from test_tz;
    
    COL1
    ---------------------------------------------------------------------------
    10-SEP-09 02.59.57.087032 PM
    

    He showed the real time of the insert as IST.

    .....................................
    If you want to set the level of the session then you must use localtimestamp as you used in your post...

    But regardless of how you use... you must spend the time zone of the client to the server, I mean 5:30 ' or "Asia/Calcutta" whatever inside your sql queries.

    Ravi Kumar

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    Create the the ""new folder " action, like this:"

    ---------------

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    --------------

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