SQL> conn scott/scott@test;
Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.1.0
Connected as scott

SQL> drop table t;

Table dropped

SQL> create table t as select * from emp;

Table created

SQL> create user terry identified by terry;

User created

SQL> grant connect,dba to terry;

Grant succeeded

SQL> conn terry/terry@test;
Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.1.0
Connected as terry

SQL> create synonym t for scott.t;

Synonym created

SQL> truncate table t;

truncate table t

ORA-00942: 表或视图不存在

SQL> truncate table scott.t;

Table truncated

在asktom论坛上也找到了tom的确定，但没有具体的原因。

ITPub博客

truncate对表的同义词无效