Oracle - SQL*Plus

What's SQL*Plus?
It's a client for oracle database. It's used to excute sql commond,generate basic report. After 8i, you can start and stop db instantce from SQL*Plus.
HOWTO: SS Instance
             sqlplus/nolog ->connect sys/password as sysdba -> startup  [mount, nomount](start instance,database mount, database open) -> shutdown [immediate,transactional,abort]
Notice: a. Sys account must login as sysdba! So you can not use isqlplus with sys account.
            b. Set sqlblankline on.
            c. Sql language is not sensitive to case of charactor. But Recommoned that Sql commond should be Upper case.
            d. subsititution varible is recommoned to use. "SELECT * FROM test where ID=&tt" .
            e. "L" view cached sql commonds  "/" excute  "DEL" delete cached comoonds "A" append to cached commond  "Save" save commond in file. "@" excute saved commond in file.

 Tips: Auto Archive Mode Startup:

$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.1.0.3.0 - Production on Wed Apr 13 09:53:25 2005
Copyright (c) 1982, 2004, Oracle.  All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - 64bit Production
With the Partitioning and Data Mining options
SQL> archive log list;
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     25
Current log sequence           27
SQL> show parameter log_archive_start
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_start                    boolean     FALSE
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 3204448256 bytes
Fixed Size                  1304912 bytes
Variable Size             651957936 bytes
Database Buffers         2550136832 bytes
Redo Buffers                1048576 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     25
Next log sequence to archive   27
Current log sequence           27
SQL>