Temp usage in system tablespace

Question

Hi
I have oracle 9i with dictionary managed tablespaces.
I have put a trigger to capture sql statement which cause temp errors.
Recently, I have found out that the below sql cause:
ORA-1652: unable to extend temp segment by 5394 in tablespace SYSTEM
select distinct i.*
from PREM i, Summ p
WHERE i.Contract_Branch_Id = p.Pol_Branch_Id
AND i.Product_Code = p.Product_Code
AND i.Contract_Pol_No = p.Pol_No
AND p.Transaction_Type = 'V23'
AND p.Accounting_Prd IN
(TO_NUMBER(TO_CHAR(ADD_MONTHS(SYSDATE, -1),'YYYYMM')), TO_NUMBER(TO_CHAR(SYSDATE, 'YYYYMM')))My question is, how come such a sql uses temp segments in System tablespace rather than normal temp tablespace ?

Answer 1

in sqlplus do the following
SET AUTOTRACE TRACEONLY EXPLAIN STATISTICS
select distinct i.*
from PREM i, Summ p
WHERE i.Contract_Branch_Id = p.Pol_Branch_Id
AND i.Product_Code = p.Product_Code
AND i.Contract_Pol_No = p.Pol_No
AND p.Transaction_Type = 'V23'
AND p.Accounting_Prd IN
(TO_NUMBER(TO_CHAR(ADD_MONTHS(SYSDATE, -1),'YYYYMM')), TO_NUMBER(TO_CHAR(SYSDATE, 'YYYYMM')))
post FORMATTED results back here