db2重命名表

设置当前的schema：

db2 => set schema db2admin
DB20000I  The SQL command completed successfully.

此时，命令中包含schema会报错：
db2 => rename table db2admin.test_tab to db2admin.test_tab1
DB21034E  The command was processed as an SQL statement because it was not a 
valid Command Line Processor command.  During SQL processing it returned:
SQL0108N  The name "test_tab1" has the wrong number of qualifiers.  
SQLSTATE=42601

去掉schema可以成功重命名：
db2 => rename table test_tab to test_tab1
DB20000I  The SQL command completed successfully.