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数据库面试题笔试题

...Dmachine = '&A'  ORDER BYhash_value, piece; exec dbms_system.set_sql_trace_in_session(sid,serial#,&sql_trace); select sid,serial# from v$session where sid = (select sidfrom v$mystat where rownum = 1); execdbms_system.set_ev(&sid,&serial#,&event...