Shows the value of a SQL*Plus system variable, or the
current SQL*Plus environment.
SHO[W] option
where option represents one of the following terms or clauses:
system_variable
ALL
BTI[TLE]
ERR[ORS] [{FUNCTION | PROCEDURE | PACKAGE | PACKAGE BODY | TRIGGER
| VIEW | TYPE | TYPE BODY | DIMENSION | JAVA CLASS} [schema.]name]
LNO
PARAMETERS [parameter_name]
PNO
REL[EASE]
REPF[OOTER]
REPH[EADER]
SGA
SPOO[L]
SQLCODE
TT[ITLE]
USER
SHOW SPOOL is not available in iSQL*Plus
4.TNSPING
TNS连接问题检测
TNSNAME.ORA
5.执行SQL Script
SQL>@C:\RUN.SQL
6.查看执行结果（开启/关闭）
SQL>SET ECHO ON(OFF)
7.常用配置
SQL>SET LINESIZE 1000
SQL>ECHO ON
SQL>SET TIMING ON
SQL>SPOOL C:\TEST.LOG
SQL>SELECT * FROM XXXXX
SQL>SPOOL OFF
8.授权
建立连接 GRANT CREATE SESSION TO USERNAME
移除连接 REVOKE CREATE SESSION TO USERNAME
其他授权
GRANT SELECT,INSERT,DELETE,UPDATE ON SCOTT.EMP TO USERNAME
确认更改
SQL>COMMIT
9.更改密码
Alter user username identified by password
10.察看Datafile
SQL>SELECT * FROM V$DATAFILE
11察看结构
SQL>DESC V$DATAFILE
12,察看DB File
SQL>SELECT * FROM V$DBFILE
13.察看Tablespace
SQL>SELECT * FROM V$TABLESPACE
14.察看SGA大小
SQL> SHOW PARAMETER SGA
15.更改 SGA大小，
SQL>ALTER SYSTEM SET SHARED_POOL_SIZE=..M
16.察看CONTROLFILE
SQL> SELECT * FROM V$CONTROLFILE
17察看REDO LOG
SQL> SELECT * FROM V$CONTROLFILE
18.察看所有的用户
SQL> SELECT USERNAME FROM DBA_USERS
19.在Offline状态下搬迁数据库文件
关闭数据库
SQL>SHUTDOWN IMMEDIATE
搬迁数据文件
连接数据库
SQL>CONN / AS SYSDBA
SQL>STARTUP MOUNT
SQL>Alter database rename file ‘e:\.......’ to ‘c:\.......’
SQL>ALTER DATABASE OPEN
SQL>SHUTDOWN
删除旧的数据文件
