Fine tuning oracle inline view

Question

Hi All,
i have a sql query (inline view) which is taking very long time (16 mins Approx) in our environment (Oracle 8.1.7 on Sun).
Can anyone have any idea to either fine tune the query OR convert it into PL/SQL.
Query:
SELECT DISTINCT ML.MFG_LEVEL,          
SUBSTR(ML.PROCESS_DESC,
INSTR(ML.PROCESS_DESC, '_', 1, 2) + 1) AS FACILITY,
SUBSTR(ML.PROCESS_DESC, 1, INSTR(ML.PROCESS_DESC, '_') - 1) AS PACKAGE_NAME,
SUBSTR(ML.PROCESS_DESC,
INSTR(ML.PROCESS_DESC, '_') + 1,
INSTR(ML.PROCESS_DESC, '_', 1, 2) -
INSTR(ML.PROCESS_DESC, '_') - 1) AS BASIC_TYPE,
BT.BATCH_TIME_MEAN / BS.BATCH_SIZE AS RUNTIME_BASE,
ML.TASK_DESC,
ML.RESOURCE_DESC AS RESOURCE_NAME,
ML.PROCESS_DESC
FROM (SELECT DISTINCT RP.VALUE AS MFG_LEVEL,
TM.TASK_DESC,
RM.RESOURCE_DESC,
PC.PROCESS_DESC
FROM DWH_MCD.TASK_MASTER TM,
DWH_MCD.TASK_PARAMETER_MASTER TP,
DWH_MCD.RESOURCE_MASTER RM,
DWH_MCD.PROCESS_PLAN PP,
DWH_MCD.PROCESS PC,
DWH_MCD.RESOURCE_PARAMETER RP,
DWH_MCD.PARAMETER_TYPE PT
WHERE PC.PROCESS_ID = PP.PROCESS_ID AND PP.TASK_ID = TM.TASK_ID AND
TM.TASK_ID = TP.TASK_ID AND TP.RESOURCE_ID = RM.RESOURCE_ID AND
RP.RESOURCE_ID = RM.RESOURCE_ID AND
PT.PARAMETER_TYPE_ID = RP.PARAMETER_TYPE_ID AND
PT.PARAMETER_TYPE_ID = 220037 -- AREA i.e MFG_LEVEL
AND(TM.TASK_DESC NOT LIKE '%SUBCON%' OR
PC.PROCESS_DESC NOT LIKE '%VF%')) ML,
(SELECT DISTINCT TP.VALUE AS BATCH_TIME_MEAN,
TM.TASK_DESC,
RM.RESOURCE_DESC,
PC.PROCESS_DESC
FROM DWH_MCD.TASK_MASTER TM,
DWH_MCD.TASK_PARAMETER_MASTER TP,
DWH_MCD.RESOURCE_MASTER RM,
DWH_MCD.PROCESS_PLAN PP,
DWH_MCD.PROCESS PC,
DWH_MCD.RESOURCE_PARAMETER RP,
DWH_MCD.PARAMETER_TYPE PT
WHERE PC.PROCESS_ID = PP.PROCESS_ID AND PP.TASK_ID = TM.TASK_ID AND
TM.TASK_ID = TP.TASK_ID AND TP.RESOURCE_ID = RM.RESOURCE_ID AND
RP.RESOURCE_ID = RM.RESOURCE_ID AND
PT.PARAMETER_TYPE_ID = TP.PARAMETER_TYPE_ID AND
PT.PARAMETER_TYPE_ID = 220030 -- BATCH TIME MEAN
AND(TM.TASK_DESC NOT LIKE '%SUBCON%' OR
PC.PROCESS_DESC NOT LIKE '%VF%')) BT,
(SELECT DISTINCT TP.VALUE AS BATCH_SIZE,
TM.TASK_DESC,
RM.RESOURCE_DESC,
PC.PROCESS_DESC
FROM DWH_MCD.TASK_MASTER TM,
DWH_MCD.TASK_PARAMETER_MASTER TP,
DWH_MCD.RESOURCE_MASTER RM,
DWH_MCD.PROCESS_PLAN PP,
DWH_MCD.PROCESS PC,
DWH_MCD.RESOURCE_PARAMETER RP,
DWH_MCD.PARAMETER_TYPE PT
WHERE PC.PROCESS_ID = PP.PROCESS_ID AND PP.TASK_ID = TM.TASK_ID AND
TM.TASK_ID = TP.TASK_ID AND TP.RESOURCE_ID = RM.RESOURCE_ID AND
RP.RESOURCE_ID = RM.RESOURCE_ID AND
PT.PARAMETER_TYPE_ID = TP.PARAMETER_TYPE_ID AND
PT.PARAMETER_TYPE_ID = 220008 -- BATCH SIZE
AND(TM.TASK_DESC NOT LIKE '%SUBCON%' OR
PC.PROCESS_DESC NOT LIKE '%VF%')) BS
WHERE ML.TASK_DESC = BT.TASK_DESC AND ML.RESOURCE_DESC = BT.RESOURCE_DESC AND
ML.PROCESS_DESC = BT.PROCESS_DESC AND ML.TASK_DESC = BS.TASK_DESC AND
ML.RESOURCE_DESC = BS.RESOURCE_DESC AND
ML.PROCESS_DESC = BS.PROCESS_DESC;
Please feel free to ask me for more information if needed.
Thank You.
Best Regards,
Jawahar.

Answer 1

Jawahar,
Before you run this sql statement analyse those tables which you use in that query using dbms_utility.analyse_schema() then create one Mview for that query. Before you do all this use "Explain Plan for" this query and observe the statistics. See you need to create a table for Explain Plan. You can find that script in ORACLE_HOME/rdbms/admin/utlxplan.sql
Kamalesh JK
jkkstar inc