查询所有用户
select * from all_users;
select * from dba_users;
查询所有会话
select * from v$session
和会话相关的系统表:
v$session_wait,v$session_connect_info, v$session_event,v$session_object_cache,v$session_cursor_cache,v$session_longops
查询所有在执行的sql
select * from v$sqltext
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