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One session = One connection = One transaction (one user behind its screen)
For session variable, see Oracle Database - (Application) Context
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Session Id
- SESSIONID - The auditing session identifier. You cannot use this attribute in distributed SQL statements.
- SID - The session ID.
You can get the current values for a session with the help of the userenv context.
Vsession
When the username is null, this is server activity not client activity. The program runs oracle.exe.