How many sessions can open at a time for 10g DB

Hi,
My App Server is connects with min 200 users , But from last week onwards
we are facting automatically disconnecting to the app server.
What was the problem we don't know .
Let me know how many sessions can open at a time ?
Thanks,

You need to capture any connection errors from the app server.
Otherwise we're just guessing.
The SESSIONS parameter restricts the number of open sessions (select * from v$parameter).
Presumably you're using DEDICATED server connections rather than SHARED server connections?

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