ORA-02391：exceeded simultaneous SESSIONS_PER_USER limit
错误码
错误描述：exceeded simultaneous SESSIONS_PER_USER limit
错误原因：An attempt was made to exceed the maximum number of concurrent sessions allowed by the SESSION_PER_USER clause of the user profile.
解决方法：End one or more concurrent sessions or ask the database administrator to increase the SESSION_PER_USER limit of the user profile.
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