ORA-02391: exceeded simultaneous SESSIONS_PER_USER limit
Cause: An attempt was made to exceed the maximum number of concurrent sessions allowed by the SESSION_PER_USER clause of the user profile.
Action: End one or more concurrent sessions or ask the database administrator to increase the SESSION_PER_USER limit of the user profile.
ORA-02396
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ORA-02391exceeded simultaneous SESSIONS_PER_USER limit