Odd issue when using UDT (user defined type)

Question

Hi all,
11g.
I ran into an odd issue when using UDT, I have these 4 schemas: USER_1, USER_2, USER_A, USER_B.
Both USER_1 and USER_2 have an UDT (actually a nested table):
CREATE OR REPLACE TYPE TAB_NUMBERS AS TABLE OF NUMBER(10)USER_A has a synonym points to the type in USER_1:
create or replace synonym TAB_NUMBERS for USER_1.TAB_NUMBERS;USER_B has a synonym points to the type in USER_2:
create or replace synonym TAB_NUMBERS for USER_2.TAB_NUMBERS;Both USER_A and USER_B have a procedure which uses the synonym:
CREATE OR REPLACE PROCEDURE proc_test (p1 in tab_numbers)
IS
BEGIN
  NULL;
END;And in the C# code:
OracleConnection conn = new OracleConnection("data source=mh;user id=USER_A;password=...");
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = "proc_test";
cmd.CommandType = CommandType.StoredProcedure;
OracleParameter op = new OracleParameter();
op.ParameterName = "p1";
op.Direction = ParameterDirection.Input;
op.OracleDbType = OracleDbType.Object;
op.UdtTypeName = "TAB_NUMBERS";
Nested_Tab_Mapping_To_Object nt = new Nested_Tab_Mapping_To_Object();
nt.container = new decimal[] { 1, 2 };
op.Value = nt;
......This code works fine, but it raises an error when I change the connection string from USER_A to USER_B, the error says:
OCI-22303: type ""."TAB_NUMBERS" not foundInterestingly, if I change op.UdtTypeName = "TAB_NUMBERS"; to op.UdtTypeName = "USER_2.TAB_NUMBERS", the error is gone, and everything works fine.
Anyone has any clues?
Thanks in advance.

Answer 1

Erase and reformat the ext HD. Then, redo the SuperDuper! backup.