Alter question about MonetDB

Hi,All: I am a MonetDB user from China. I have some troubles when I was using MonetDB. I use mclient and enter this sql : "alter table t1 rename to t2；", while this mclient is alive,I use anthor mclient to connect the same database as the former and I enter this sql : "select * from t2" then I get an error : no such table. So how can I use alter command to make all mclients take effect?