Please tune the query

Question

Hi folks..pls tune/rewrite my query
SELECT
bu_code,bu_type,cust_no ,cur_code,sales_date,receipt_no,till_no,card_no,invoice_total,amount_of_goods,(invoice_total - amount_of_goods) AS amount_of_non_goods,
pay_in_advance AS amounts_of_advance_pay,amount_of_discounts, Error_flag
FROM
(select
            distinct  'STO' AS BU_TYPE,
workinv.tot_cust_no AS  cust_no,
workinv.comp_code as comp_code,
workinv.cash_no as till_no,
workinv.receipt_no  as receipt_no,
workinv.sales_date as sales_date,
workinv.cur_code as cur_code,
invhead.acct_usr_no as card_no,
invhead.inv_no as inv_no,
invhead.sto_no as bu_code, (SELECT MAX (DECODE (e.sum_code, 'TOTAL', e.amount_incl))
                                          FROM invoice_sums_t e
                                          WHERE e.inv_no = invsums.inv_no
                                          AND e.comp_code = invsums.comp_code) AS invoice_total,
                                         (SELECT MAX (DECODE (e.sum_code, 'PIA', e.amount_incl))
                                           FROM invoice_sums_t e
                                           WHERE e.inv_no = invsums.inv_no
                                          AND e.comp_code = invsums.comp_code) AS pay_in_advance,
                                         (SELECT SUM(e.amount_incl)
                                          FROM invoice_sums_t e
                                          WHERE E.SUM_CODE LIKE 'GOODS0%'
                                          AND e.inv_no = invsums.inv_no
                                          AND e.comp_code = invsums.comp_code) AS amount_of_goods,
                                         (SELECT SUM(e.amount_incl)
                                          FROM invoice_sums_t e
                                         WHERE E.SUM_CODE LIKE 'DISCOUNT0%'
                                          AND e.inv_no = invsums.inv_no
                                          AND e.comp_code = invsums.comp_code) AS amount_of_discounts ,
                                  CASE workinv.error_flag WHEN 'H' THEN 'Y' ELSE 'N' END
                                  AS Error_flag,
                                  WORKINV.ERROR_FLAG AS invoice_on_hold
FROM  work_invoice_info_t workinv,
          invoice_header_t invhead,
          invoice_sums_t invsums,
          i_invoice_info_t_log invlog,
          o_pam_document_header_log_t opdhlt
WHERE  invhead.comp_code= workinv.comp_code
AND TRIM(workinv.Tot_cust_no) =TRIM(invlog.tot_cust_no)
AND TRIM (workinv.sto_no) = invhead.sto_no
AND TRIM (workinv.sales_date) =TO_CHAR (invhead.sales_date, 'YYMMDD')
AND TRIM (workinv.cash_no) =TO_NUMBER (TRIM (invhead.cash_no))
AND TRIM (workinv.receipt_no) =TO_NUMBER (TRIM (invhead.receipt_no))
AND invhead.comp_code = invsums.comp_code
AND invhead.inv_no = invsums.inv_no
AND TRIM(workinv.sto_no) = invlog.sto_no
AND TRIM(workinv.receipt_no) = invlog.receipt_no
AND TRIM(workinv.cash_no) = invlog.cash_no
AND TRIM(workinv.sales_date) = invlog.sales_date)dear folks am debugging the code as step by step
i have taken inline query and selecting 1 as column from joining the same tables used in the above query
select
   1
FROM  work_invoice_info_t workinv,
          invoice_header_t invhead,
          invoice_sums_t invsums,
          i_invoice_info_t_log invlog,
          o_pam_document_header_log_t opdhlt
WHERE  invhead.comp_code= workinv.comp_code
AND TRIM(workinv.Tot_cust_no) =TRIM(invlog.tot_cust_no) --*if iam firing only this much then output is coming --in 2sec*
AND TRIM (workinv.sto_no) = invhead.sto_no -- if i add the below 2 cols then it is taking lot of time(half an hr)
AND TRIM (workinv.sales_date) =TO_CHAR (invhead.sales_date, 'YYMMDD')Hence should i create indexes on both 'sto_no' and 'sales_date' cols ?
please shed some light on this

Answer 1

newbie wrote:
..so how can i tune please share ideasTuning is a vast area. Many people spend their entire working lives tuning other people's code. Those people make fine livings from their work. They couldn't do that if it was merely a matter of squinting at some shonky piece of SQL and saying, "Ah, that's the badger!" No, tuning requires a great deal of context and additional information. Explain plans, statistcs, metadata, right down to what version of the database you're using.
Now, you already have been provided with links to helpful threads: these explain how you can proceed in collecting this information and investigating your problem. The sooner you start reading those links the sooner you can start diagnosing the poor performance.
If you still can't crack it, by all means post here again. But don't bother until you have gathered all the ibnformation you need to [post so that we can understand your situation.
Cheers, APC