修改Oracle【12C】字符集

1. select userenv('language') from dual; //查看系统字符集编码
2. select * from nls_database_parameters where parameter in ('NLS_CHARCTERSET','NLS_NCHAR_CHARACTERSET');
3. shutdown immediate
4. startup
5. alter session set sql_trace=true;
6. alter system enable restricted session;
7. show parameter job_queue_processes;
8. alter system set job_queue_processes=0;
9. alter system set aq_tm_processes=0;
10. alter database character set INTERNAL_USE AL32UTF8;
11. update props$ set VALUE$='UTF8' where NAME='NLS_NCHAR_CHARACTERSET';