Oracle故障处理
1：故障发现
Oracle 启动后发现其他帐户都无法登陆，报告错误如下：
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or dir...
修改了字符集，修改错了，然后不能启动
alter system set nls_language='AMERICA';
shutdown immediate;
startup
报错
[oracle@oracle4 ~]$ sqlplus / as sysdbaSQL*Plus: Release 11.2.0.4.0 Production on Fri ...
SQL中的单记录函数
1.ASCII
返回与指定的字符对应的十进制数;
SQL> select ascii('A') A,ascii('a') a,ascii('0') zero,ascii(' ') space from dual;
A A ZERO SPACE
--------- --------- --------- ---...
SQL中的单记录函数1.ASCII返回与指定的字符对应的十进制数;SQL> select ascii('A') A,ascii('a') a,ascii('0') zero,ascii(' ') space from dual;
A A ZERO SPACE--------- --------- --------- ---------65 97 ...
