spool /tmp/a.txt

******執行任何sql操作

spool off

ho cat /tmp/a.txt

啟動sqlplus工具：

su - oracle

$lsnrctl status/start/stop 查看監聽狀態以及啟動停止監聽

sqlplus / as sysdba

sqlplus工具啟動成功，進入SQL提示符!

SQL>

進入SQL提示符要做的第一件事是登錄：

SQL>conn scott/tiger

查看當前使用哪一個用戶登錄的

SQL> show user

在命令行為scott用戶解鎖:

SQL>conn / as sysdba

SQL>alter user scott identified by tiger account unlock;

SQL>conn scott/tiger

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

ERROR:

ORA-01034: ORACLE not available

ORA-27101: shared memory realm does not exist

Linux Error: 2: No such file or directory

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

查看數據庫相關的系統進程:

ps -ef | grep ora_

查看數據庫的共享內存是否分配:

ipcs -sm

系統reboot後怎麽啟動數據庫?

su - oracle

sqlplus / as sysdba

SQL>startup或者shutdown immediate

SQL>select status from v$instance; 查看實例狀態，正常為open

SQL>conn scott/tiger

第0章：oracle_sql語句之基本操作