echo $ORACLE_HOME
echo $ORACLE_SID
ps -ef | grep smon

/proc/<PID>/environ

exp \"sys/oracle as sysdba\" file=/mnt/exp/db.dmp log=/mnt/exp/db.log full=y rows=n compress=y direct=n

imp \"sys/oracle as sysdba\" file=db.dmp ignore=y full=y


select tablespace_name,file_name from SYS.DBA_DATA_FILES;


alter tablespace TABLE_SPACE_NAME add datafile 'xxx.dbf' size 5000M reuse AUTOEXTEND ON NEXT 200M MAXSIZE UNLIMITED;

计算表空间空闲空间：

SELECT UPPER(D.TABLESPACE_NAME) "TableSpaceName",
       D.TOT_GROOTTE_MB "Total(M)",
       D.TOT_GROOTTE_MB - nvl(F.TOTAL_BYTES, 0) "Used(M)",
       TO_CHAR(ROUND((D.TOT_GROOTTE_MB - nvl(F.TOTAL_BYTES, 0)) / D.TOT_GROOTTE_MB * 100, 2), '990.99')||'%' "Used(%)",
       nvl(F.TOTAL_BYTES, 0) "Free(M)", F.MAX_BYTES "MaxBlock(M)"
  FROM (SELECT TABLESPACE_NAME,
               ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
               ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
          FROM SYS.DBA_FREE_SPACE
         GROUP BY TABLESPACE_NAME) F,
       (SELECT DD.TABLESPACE_NAME,
               ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
          FROM SYS.DBA_DATA_FILES DD
         GROUP BY DD.TABLESPACE_NAME) D
 WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)
 ORDER BY F.TABLESPACE_NAME;

权限

授予权限：

GRANT privilege [, privilege...] TO user [, user| role, PUBLIC...]
       [WITH ADMIN OPTION];  // 是否用户可再授权限给别的用户

CREATE SESSION	创建会话
CREATE SEQUENCE	创建序列
CREATE SYNONYM	创建同名对象
CREATE TABLE	在用户模式中创建表
CREATE ANY TABLE	在任何模式中创建表
DROP TABLE	在用户模式中删除表
DROP ANY TABLE	在任何模式中删除表
CREATE PROCEDURE	创建存储过程
EXECUTE ANY PROCEDURE	执行任何模式的存储过程
CREATE USER	创建用户
DROP USER	删除用户
CREATE VIEW	创建视图

查看权限：

SELECT grantee,privilege,admin_option FROM dba_sys_privs
               WHERE grantee IN ('_DB_');

• 显示所有用户：select * from all_users;
• 显示所有Table：select * from all_tables;
• 查看tablespace空间：select tablespace_name,round(sum(bytes)/1024/1024,2) "M" from dba_free_space group by tablespace_name;

账号被锁：

• 查看被锁用户及时间： select username,lock_date from dba_users;
• 解锁：ALTER USER username [IDENTIFIED BY password] ACCOUNT UNLOCK;
• 查看设置：select * from dba_profiles where RESOURCE_NAME = 'FAILED_LOGIN_ATTEMPTS';
• 修改为30次：alter profile default limit FAILED_LOGIN_ATTEMPTS 30;
• 修改为没有限制：alter profile default limit FAILED_LOGIN_ATTEMPTS unlimited;