Windows handles left open after opening and closing registry key

When I open a registry key with 'Create Registry Key.vi' or 'Open Registry Key.vi' and thereafter close it with 'Close Registry Key.vi', there are 2 Windows handles left open. As my program polls the registry for changes repeatedly, my system crashes because after a certain time of use, no handles are available anymore.
I'm using Windows XP and Labview 8.6.
The VI in the attachment illustrates the problem (reading and writing of values are left out as these have no influence on the problem).
How can I read and write the registry, without leaving open handles?
Ruud
Attachments:
Registry-handles.vi ‏12 KB

Dear Ruud,
thank you so much for your post on our webforum. I noticed that this is a known issue for Labview 8.6, a while ago it was reported with a Corrective Action Request (CAR# 132471). The issue should be resolved with Labview 2009. I wasn't able to reproduce the issue wit Labview 2010, the number of handles stayed arround 28000,
best regards,
Martijn S
Applications Engineer
NI Netherlands
Attachments:
handles.JPG ‏104 KB

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If the return code is 0 then the document is cleared..
IF sy-subrc = 0.
    WRITE: / T_BKPF-BELNR , ' - Closed'.
Else the document is not cleared.
ELSE.
    WRITE: / T_BKPF-BELNR , ' - Open'.
ENDIF.
ENDLOOP.
Thanks,
Naren

Open and closed cursor

I have some doubts/questions .
What is the difference between open and closed cursor?
Are library cache locks same as parse locks?
What is the difference between latch and mutex?
I would be grateful if experts could answer these questions.
Regards

Almost correct. The terminology is however nor correct.
Simplistically:
The SQL engine receives a SQL. It attempts a soft parse first. This means looking for an existing cursor in the Shared Pool with the same SQL. This existing cursor can be in use by other sessions. It does not matter - if that cursor is in used (opend by other sessions), or not. It may not be in use at all and simply sitting there in the cache. If such a cursor is found, it is used for that session's SQL - and that session gets a cursor handle (reference/pointer) to that existing cursor.
If the SQL engine does not find an existing cursor to use, it needs to create a brand new cursor in the Shared Pool. This is a hard parse. Again, the session receives a cursor handle for that new cursor created.
And that is it.
You now need to decide how to use that cursor handle. The cursor itself is a program. You have a handle to execute that cursor program. Via its bind interface you can input data to this cursor program. Then execute it and receive (fetch) output of that cursor program.
So the ideal is to re-use the cursor handle again and again.
Basic example: the following is not optimal as the same cursor is opened and closed, opened and closed, for each read from the file. A lot of soft parsing results.
while not-eof( filehandle )   // read data from a file
read file data into var1, var2
open cursor for 'insert into testtab values( :1, :2)'   // create a cursor
bind cursor :1 = var, :2 = var2 // bind values to cursor (for insert)
exec cursor // do SQL insert
close cursor
end whileThis is a lot better. A single cursor is used and executed again and again:
open cursor for 'insert into testtab values( :1, :2)'   // create a cursor
while not-eof( filehandle )   // read data from a file
read file data into var1, var2
bind cursor :1 = var, :2 = var2 // bind values to cursor (for insert)
exec cursor // do SQL insert
end while
close cursor In this case a single soft/hard parse - and the client uses that cursor handle to execute that cursor (insert data) program again and again.

I WORK WITH 20+ TABS OPEN, SOMETIMES IF A WINDOW IS ALSO OPEN AND I DON'T CLOSE IT FIRST, MY TABS DON'T REOPEN WHEN I RESTART FIREFOX-HOW CAN I FIND AND REOPEN?

I understand how to set the restore tabs function and have done so. Usually my tabs reopen when I restart, but every once in a while if I have other windows (not tabs) open, and I forget to close them all first, before I close my main window, then when I reopen, my tabs are gone. I have gone to History and I can see the Restore Previous Session and Restore Closed Tabs commands, but they are not highlighted and they don't work. Please advise

Try using the Firefox button > Exit when you go to close Firefox, that should save all your open windows / tabs.

Windows handles left open after opening and closing registry key

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