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    ORACLE_HOME °²×°¹ý³ÌÖÐÏÔʾµÄoracle home Ŀ¼
    ORACLE_SID
    PATH=$PAHT£º$ORACLE_HOME/bin
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    1. Æô¶¯ºÍ¹Ø±Õ¼àÌý
    Æô¶¯¼àÌý£ºlsnrctl start
    ¹Ø±Õ¼àÌý£ºlsnrctl stop
    2. Æô¶¯ºÍÍ£Ö¹Êý¾Ý¿â
    Æô¶¯Êý¾Ý¿â£ºÔÚÖÕ¶ËÊäÈë sqlplus '/ as sysdba' ½øÈë sqlplus£¬ÔÚ sqlplus ÊäÈë startup
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    3. Æô¶¯ºÍÍ£Ö¹ dbconsole ·þÎñ
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    Æô¶¯ dbconsole ·þÎñ£º emctl start dbconsole
    Í£Ö¹ dbconsole ·þÎñ£º emctl stop dbconsole
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  select b.owner,b.object_name,l.session_id,l.locked_mode
  from v$locked_object l, dba_objects b
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¡¡¡¡create table student
¡¡¡¡(
¡¡¡¡id int primary key,
¡¡¡¡name nvarchar2(50) not null,
¡¡¡¡score number not null
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¡¡¡¡¡¡select username from dba_users;
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¡¡¡¡¡¡select * from dba_data_files;
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