Creat too many instance when writing an oracle database

Hi
I want to write Oracle database with database toolkits;
but..i found there are too many instance or called session（exceed the upper limit) created when the program running . that makes the Orace server stop responding
Is there anything i need to modify？
Attachments:
Oracle DB.vi ‏36 KB

Frankly I have never seen this problem, but then I make a point of never using the database connectivity toolkit. Assuming a Windows platform, Windows implements something called connection pooling so when you "close" a connection the OS inserts it into a pool so If you ask for another connection it doesn't actually open a new one it just gives you back a reference to one of the ones you "closed" before.
What OS are you running on?
What version of Oracle?
Is the instance of Oracle local or on another computer?
How are you communicating with Oracle (odbc, oledb, etc)?
Mike...
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Creat too many instance when writing an oracle database

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