Editing tag values logged in tag history / citadel database

Hi,
I having been logging data from input/output tags and memory tags to my citadel database over the past week and due to some errors in my vi (my fault) some values are showing on my trends that are incorrect. These values are affecting my calculations (e.g. zeros, infinite numbers etc) and I would really like to delete them if possible.
Does anyone know a way of going in to the database/tag history and selecting and deleting values whilst still leaving other data in tact?
Many thanks,
Stuart

You can remove the data from a Citadel database using LabVIEW, Lookout or Measurement and Automation Explorer (MAX). This is a two step process:
First you archive the data that you want to delete. When archiving, choose to delete this data from the original database. The archiving operation will move the data from your database to new database.
The second step is to delete the new archived database. This removes the extra database that was created by the archive operation. Once the data has been archived you can remove the archived data by either deleting the database manually or by using file VIs from LabVIEW.
The document elaborates this process for MAX, LabVIEW and Lookout separately
Measurement and Automation Explorer (MAX) You must have Historical Data Viewer installed. It comes with Lookout 5.0 and LabVIEW DSC 6.1.
To remove the historical data in MAX, follow these steps:
Under the Historical Data folder in MAX, select the database that you want to remove data from.
Right-click the database and select New View»Trace. This creates a trace view with the default name of New View under the database folder.
On the Trace Attributes page, click on Add new traces. Select the traces you want to archive.
Select a starting and stopping time.
Right-click New View and select Archive.
Enter a directory path to store the archived data.
Check the Delete data from source database checkbox to delete the data from the source database.
Click Start.
Once it is complete, click Close.

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How do you change values after logging data to the citadel database (DSC)?

How would one go about changing values that already exist in the citadel database. So say I were logging a numeric value with a timestamp for 1 year and then wanted to change a few values for the month of June because my sensor wasn't working at that time. How could I do this? Is it possible without re-creating the whole database over?
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mattyk wrote:
Hey Ben,
Thanks for the quick response. I called NI and asked about this because this would be a big show stopper for me. Their applications engineer said that the best way to change previous data would be to read in the trace that you want to change, modify it and save it as a new trace. I am also looking into SQL querying. I was able to connect to the citadel database by setting up a ODBC data source and using the database connectivity toolkit to query the database. This worked. Now I am trying to come up with a statement in SQL to change previously saved data. I'll Keep you posted.
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That reinforces my suspicions.
I have an app running for about 8 years now that keeps a paper trail to enusr ethe cartdiges used in respirators (operated NIOSH National Institute of Occupational Safety and Health par teh CDC) that use DSC to enusre nobody can ever falsify those records. If they can be hacked I my customer and anyone using a respirator with a NIOSH sticker on the side of it, want to know.
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Logging large .ctl to citadel database is slow

Hi, All
I'm using LV 8.5 with DSC.
I'm logging my own.ctl types shared variables to citadel database. This own.ctl includes 52 piece doubles, strings and boolean datatypes. I have 200 piece this tape of shared variables and I record all that shared variable information to citadel database. All operations as writing, reading, achieving, and deleting database are very slow. They also consume lot CPU time. Is there any capacity limits on citadel database ? Which is best structure to record this kind of data to database? I have tested (see attacment) structure but it seems to be very slow because I have to delete and create database trace references after 1st database is full.
BR,
Attachments:
code_structure.jpg ‏51 KB

When you say "...to Log Data only when necessary... " I assume you are using Set Tag Attribute.vi to establish this behavior.
National Instruments recently added a feature (as a hot-fix) to the DSC Engine to be able to ignore timestamps coming from servers to prevent to log values with "back-in-time" timestamps. Citadel is really critical taking values back in time (logs a ) and therefore retrieval of Citadel data with such back-in-time traces could act wired.
You can find more info from:
Why Do I See a Lot of NaN (Not-a-Number) In My Citadel Database When I Use the Set Tag Attribute.vi?
blic.nsf/websearch/B871D05A1A4742FA86256C70006BBE00?OpenDocument>How Do I Avoid Out-of-Synch (a.k.a....
The Hot-Fix can be found:
LabVIEW Datalogging and Supervisory Control Module Version 6.1 for Windows 2000/95/98/ME/NT/XP -- Fi...
I assume you run into such a use case - maybe. It happen to me, too . And I've created a small VI which would analyze traces on back-in-time (NaN - Not a number) values. I assume the missing Data in DIAdem are those Not-a-Numbers aka Break.
If you still encounter some problems after applying the DSCEngine.ini UseServerTimestamps=false, you might contact a National Instruments Support Engineer.
Hope this helps
Roland
Attachments:
BackInTimeAnalyzer.llb ‏622 KB

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Pilla,
Unfortunately, 6.0.2 does not have the capability. This was one of the new 6.1 features. Check Table 3 on page 7 in this manual. The Archive Database is what you need for programmatic archive. In 6.1 there is also a new utility called Historical Data Viewer, that allows you to do it manually.
http://www.ni.com/pdf/manuals/322955b.pdf
I remember seeing some online document about archiving Citadel database. ... oh, ya, here it is (I searched ni.com for "archiving citadel" and it was the first hit):
http://zone.ni.com/devzone/conceptd.nsf/webmain/2F24997EAD7C53A686256B6E00686D64?opendocument
Have a good weekend.
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I want to produce a template that will let users create pages
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So, you have some number of people who are editing the child
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Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
==================
http://www.projectseven.com/go
- DW FAQs, Tutorials & Resources
http://www.dwfaq.com - DW FAQs,
Tutorials & Resources
==================
"manicbananic" <[email protected]> wrote in
message
news:g7pimq$fvg$[email protected]..
>I want to produce a template that will let users create
pages that list
>items
> as a thumbnail image and a short text description, one
after the other.
>
> I can set this up as a repeating region, but I would
also like to make
> only
> certain attributes of the image editable (src and alt
for example).
> However,
> when I use editable tag attributes to do this, the image
in each repeated
> region ends up with the same attribute values - when I
add a new repeat
> region
> and then change the src tag through the Template
Properties dialog,
>
all
> of the images take on the same src value. Looking at the
code, it looks
> like
> the editable instances in each repeated region get the
same name, and so I
> can
> see that DW will get confused.
>
> Is this a limitation in DW? Is there a work around
anyone can suggest?
>
> TIA
>

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Last edited by SpeedVin (2009-08-07 19:25:33)

toad wrote:
SpeedVin wrote:Ok problem solved to try tag editor you need to have your config files in ~/.ncmpcpp :|
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I think I have the answer.
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Editing tag values logged in tag history / citadel database

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