Modify the Oracle database character set to UTF8

Modify the Oracle database character set to UTF8 to view the character set select userenv ('language') from dual; 1. conn/as sysdba 2. run the following code: shutdown immediate; startup mount exclusive; alter system enable restricted session; alter system set JOB_QUEUE_PROCESSES = 0; alter system set AQ_TM_PROCESSES = 0; alter database open; (------------ if any problem occurs, insert the following statement --------------) alter database national character set UTF8; alter database character set UTF8; SHUTDOWN immediate; STARTUP; if the modification fails, call the following statement and execute the statement again to run alter database national character set INTERNAL_USE UTF8;