Error on creating index

[Ali TOYGAR]

Hi ,     I have a problem with creating an  index ot table AAA with 400000 records.   After I write following sql and run it ORACLE stops. CREATE  INDEX index_1  ON USER1.AAA   ( field1,     field2  )   I copied same table to user2 and when I write above sql it runs !!!!   CREATE  INDEX index_1  ON USER2.AAA   ( field1,     field2  )   Both users ( user1 and user2 ) have same priviliges.(unlimited tables space,connect,resource,...)   what is the problem.   please help me