在SQL*PLUS 中，以DBA登录
命令：
1 >shutdown immediate; (把database停了) 2
3 >startup mount; (把database重开) 4
5 >alter system enable restricted session; 6
7 >alter system set job_queue_processes=0; 8
9 >alter system set aq_tm_processes=0; 10
11 >alter database open; 12
13 >alter database character set utf8; 14
15 OR
16
17 >alter database character set internal_use utf8; 18
19 >shutdown immediate; 20
21 >startup; (重开正常oracle)