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IDS Forum

Re: IDS 12.1- Query cost High

Posted By: Art Kagel
Date: Thursday, 7 April 2016, at 6:40 a.m.

In Response To: IDS 12.1- Query cost High (MOHD FADZIL JUSOH)

Mohd:

You cannot use the cost figures to determine whether the query is running
better in one version of IDS versus another. The costs are calculated
differently in version 11.70 and later than they were in versions 11.50 and
earlier. One of several changes is that there is now a cost associated with
using an index which was never included in the cost values before. In
general you cannot use the costs to compare two versions of the same query
or performance between two different platforms or engine releases and with
the changes in cost calculations this is now more true than ever.

The only proper measure of whether the query is running better or worse
from one version to another is run time. In your case the query is running
in 5:38 under v11.10 and in 5:34 under v12.10 which is slightly faster. The
difference which is about 1.2% may not be significant at all. I would run
the queries several times both with an empty cache (so right after a
restart) and after having run it once already to prime the cache to see how
it will perform.

BTW, the change in cost calculations will sometimes cause the optimizer to
choose a different query path than it did under v11.10. Sometimes this is a
better path, sometimes it is not. The symptom is that some queries queries
that used to use an index may now use a sequential scan and be slower.
There is an undocumented ONCONFIG parameter, OPT_SEEK_FACTOR, which
controls the value used for calculating the cost of index reads. This has a
range from 0 to 25 and defaults to 6. If you have this problem, you can set
it to zero (0) which will return the costing calculation to something
closer to what v11.10 used and will usually change the query paths back to
those used by v11.10.

Art

Art S. Kagel, President and Principal Consultant
ASK Database Management
www.askdbmgt.com

Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Thu, Apr 7, 2016 at 4:52 AM, MOHD FADZIL JUSOH <fadzil@isianpadu.com>
wrote:

> Hi,
>
> We now plan to migration our IDS from 11.10 to 12.10 on HPUX platform.
>
> I try to run SQL syntax to estimated cost using set explain to determine
> performance will be increase at latest IDS but i surprise, it's not what i
> think, take longer time to execution at new IDS.
>
> 1. Result at ids 11.10
>
> QUERY: (OPTIMIZATION TIMESTAMP: 04-07-2016 14:03:46)
> ------
> select surr_key, pay_dt, ( pay_amt + pay_int_amt - paid_amt - adj_amt),
> rowid, pay_typ, pay_chg_typ, trn_cd, doc_series, yymm, doc_no, bas_doc_no
> from acc_pay where ( pay_amt + pay_int_amt - paid_amt - adj_amt) > 0
> and ref_no ="T00001"
> and ref_typ = "AGT"
> and ( trn_cd is not null and trn_cd != " ")
> and pay_dt <="31/03/2016"
> order by pay_dt
>
> Estimated Cost: 1344
> Estimated # of Rows Returned: 903
>
> 1) informix.acc_pay: INDEX PATH
>
> Filters: (informix.acc_pay.pay_amt + informix.acc_pay.pay_int_amt -
> informix.acc_pay.paid_amt - informix.acc_pay.adj_amt > 0.00 AND
> informix.acc_pay.trn_cd IS N
> OT NULL )
>
> (1) Index Keys: ref_typ ref_no pay_dt pay_typ pay_chg_typ bas_doc_typ
> bas_doc_no clt_cd trn_cd doc_series yymm doc_no (Key-First) (Serial,
> fragments: ALL)
>
> Lower Index Filter: (informix.acc_pay.ref_no = 'T00001' AND
> informix.acc_pay.ref_typ = 'AGT' )
>
> Upper Index Filter: informix.acc_pay.pay_dt <= 31/03/2016
>
> Index Key Filters: (informix.acc_pay.trn_cd != ' ' )
>
> Query statistics:
> -----------------
>
> Table map :
> ----------------------------
> Internal name Table name
> ----------------------------
> t1 acc_pay
>
> type table rows_prod est_rows rows_scan time est_cost
> -------------------------------------------------------------------
> scan t1 0 903 829946 00:00:39 1345
>
> 2. result at ids 12.60
>
> QUERY: (OPTIMIZATION TIMESTAMP: 03-31-2016 13:29:17)
> ------
> select surr_key, pay_dt, ( pay_amt + pay_int_amt - paid_amt - adj_amt),
> rowid, pay_typ, pay_chg_typ, trn_cd, doc_series, yymm, doc_no, bas_doc_no
> from acc_pay where ( pay_amt + pay_int_amt - paid_amt - adj_amt) > 0
> and ref_no ="T00001"
> and ref_typ = "AGT"
> and ( trn_cd is not null and trn_cd != " ")
> and pay_dt <="31/03/2016"
> order by pay_dt
>
> Estimated Cost: 2162855
> Estimated # of Rows Returned: 246479
>
> 1) informix.acc_pay: INDEX PATH
>
> Filters: (informix.acc_pay.pay_amt + informix.acc_pay.pay_int_amt - info
> rmix.acc_pay.paid_amt - informix.acc_pay.adj_amt > 0.00 AND
> informix.acc_pay.trn
> _cd IS NOT NULL )
>
> (1) Index Name: informix.i_acc_pay
> @
> "acc_pay.txt" 78 lines, 3018 characters
>
> QUERY: (OPTIMIZATION TIMESTAMP: 03-31-2016 13:29:17)
> ------
> select surr_key, pay_dt, ( pay_amt + pay_int_amt - paid_amt - adj_amt),
> rowid, pay_typ, pay_chg_typ, trn_cd, doc_series, yymm, doc_no, bas_doc_no
> from acc_pay where ( pay_amt + pay_int_amt - paid_amt - adj_amt) > 0
> and ref_no ="T00001"
> and ref_typ = "AGT"
> and ( trn_cd is not null and trn_cd != " ")
> and pay_dt <="31/03/2016"
> order by pay_dt
>
> Estimated Cost: 2162855
> Estimated # of Rows Returned: 246479
>
> 1) informix.acc_pay: INDEX PATH
>
> Filters: (informix.acc_pay.pay_amt + informix.acc_pay.pay_int_amt -
> informix.acc_pay.paid_amt - informix.acc_pay.adj_amt > 0.00 AND
> informix.acc_pay.trn_cd IS N
> OT NULL )
>
> (1) Index Name: informix.i_acc_pay
>
> Index Keys: ref_typ ref_no pay_dt pay_typ pay_chg_typ bas_doc_typ
> bas_doc_no
> clt_cd trn_cd doc_series yymm doc_no (Key-First) (Serial, fragments: ALL)
>
> Lower Index Filter: (informix.acc_pay.ref_no = 'T00001' AND
> informix.acc_pay.ref_typ = 'AGT' )
>
> Upper Index Filter: informix.acc_pay.pay_dt <= 31/03/2016
>
> Index Key Filters: (informix.acc_pay.trn_cd != ' ' )
>
> Query statistics:
> -----------------
>
> Table map :
> ----------------------------
> Internal name Table name
> ----------------------------
> t1 acc_pay
>
> type table rows_prod est_rows rows_scan time est_cost
> -------------------------------------------------------------------
> scan t1 0 246479 827409 05:38.52 2162855
>
> QUERY: (OPTIMIZATION TIMESTAMP: 03-31-2016 13:29:50)
> ------
> select surr_key, pay_dt, ( pay_amt + pay_int_amt - paid_amt - adj_amt),
> rowid, pay_typ, pay_chg_typ, trn_cd, doc_series, yymm, doc_no, bas_doc_no
> from acc_pay where ( pay_amt + pay_int_amt - paid_amt - adj_amt) > 0
> and ref_no ="T00001"
> and ref_typ = "AGT"
> and ( trn_cd is not null and trn_cd != " ")
> and pay_dt <="31/03/2016"
> order by pay_dt
>
> Estimated Cost: 2162855
> Estimated # of Rows Returned: 246479
>
> 1) informix.acc_pay: INDEX PATH
>
> Filters: (informix.acc_pay.pay_amt + informix.acc_pay.pay_int_amt -
> informix.acc_pay.paid_amt - informix.acc_pay.adj_amt > 0.00 AND
> informix.acc_pay.trn_cd IS N
> OT NULL )
>
> (1) Index Name: informix.i_acc_pay
>
> Index Keys: ref_typ ref_no pay_dt pay_typ pay_chg_typ bas_doc_typ
> bas_doc_no
> clt_cd trn_cd doc_series yymm doc_no (Key-First) (Serial, fragments: ALL)
>
> Lower Index Filter: (informix.acc_pay.ref_no = 'T00001' AND
> informix.acc_pay.ref_typ = 'AGT' )
>
> Upper Index Filter: informix.acc_pay.pay_dt <= 31/03/2016
>
> Index Key Filters: (informix.acc_pay.trn_cd != ' ' )
>
> Query statistics:
> -----------------
>
> Table map :
> ----------------------------
> Internal name Table name
> ----------------------------
> t1 acc_pay
>
> type table rows_prod est_rows rows_scan time est_cost
> -------------------------------------------------------------------
> scan t1 0 246479 827409 05:34.13 2162855
>
> Any parameter i need to configure at IDS 12.10. How to improve performance
> query at ids 12.10? Please advice.
>
> Thank You
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--bcaec502d3009d155a052fe2b528

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