Oracle 常用

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忘记Oracle SYSTEM密码：

  1,打开Command命令提示符黑窗口 (win+R   >  cmd)

  2,启动Oracle相关服务（服务名可能不一样，若服务已启动可直接跳过）

net start OracleOraDb11g_home1TNSListener

net start OracleServiceORCL

  3,进入SQLPLUS

sqlplus/nolog

  4,连接到SYSDBA

conn / as sysdba

 
  5,修改SYSTEM密码

alter user system identified by systempassword

 
  6,解锁SYSTEM账户

alter user system account unlock

 
  7,登录连接到SYSTEM

conn system/systempassword

 

 

Oracle建表空间建用户：

/***** 共四步 *****/
/*第1步：创建临时表空间  */
create temporary tablespace user_temp  
tempfile 'D:\app\Administrator\oradata\orcl\user_temp.dbf' 
size 100m  
autoextend on  
next 50m maxsize 20480m  
extent management local;  

/*第2步：创建数据表空间  */
create tablespace user_data  
logging  
datafile 'D:\app\Administrator\oradata\orcl\user_data.dbf' 
size 100m  
autoextend on  
next 50m maxsize 20480m  
extent management local;  

/*第3步：创建用户并指定表空间  */
create user myusername identified by mypassword  
default tablespace user_data  
temporary tablespace user_temp;  

/*第4步：给用户授予权限  */
grant connect,resource,dba to username;
 

 

 Oracle Kill Session

select Distinct 'alter system kill session ' || chr(39) || b.sid || ',' ||
                b.serial# || chr(39) || ';' As CopyTheSQLToKillSession,
                b.username,
                b.logon_time
  from v$locked_object a, v$session b
 where a.session_id = b.sid
 order by b.logon_time;

 

Oracle 查看内存占用情况

SELECT trunc(sum(b.value) / 1024, 2) || 'K' 占用内存, A.PROGRAM 映像名称
  FROM V$SESSION A
  JOIN (SELECT B.SID, SUM(B.value) AS VALUE, C.name
          FROM v$sesstat B, v$sysstat C
         WHERE B.statistic# = C.statistic#
           and C.name in ('session pga memory') --,'session uga memory')
         GROUP BY B.SID, C.name) b
    ON A.SID = B.SID
 group by a.program
 order by sum(b.value) desc;

Oracle 查看字符集

 --客户端字符集环境

SELECT * FROM V$NLS_PARAMETERS;

SELECT USERENV('language') FROM DUAL;

--数据库服务器字符集

SELECT * FROM NLS_DATABASE_PARAMETERS;

--会话字符集环境

SELECT * FROM NLS_SESSION_PARAMETERS;

 Oracle 备份（导入导出）

exp 用户名/密码@远程的IP:端口/实例 file=存放的位置