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Re: Why index directive has higher cost?

Posted By: ART KAGEL, BLOOMBERG/ 731 LEXIN
Date: Friday, 9 March 2007, at 7:37 a.m.

In Response To: Why index directive has higher cost? (TAN BK)

How do the actual runtime of the two queries compare? It's possible that the
query without the directive is just MUCH cheaper to run than the one with the
directive. Or, more likely, your Data Distributions are not up to snuff. Run
the recommended UPDATE STATISTICS commands as described in the Performance Guide
or the updated rules in John Miller III's white paper on the subject, or get
and run my dostats utility which implements those protocols automatically.
Art S. Kagel
----- Original Message -----
From: Tan Bk <ids@iiug.org>
At: 3/09 3:55:03
Hi all,
Can any explain to me why index directive for the below select statmenet has
higher cost compare with not using the index directive?
This is informix 9.4.
i_sub_info_3 = index by ship_acct,payer_acct,rcvr_acct
QUERY: (Original SQL)
------
select {+INDEX(subscription_info, "i_sub_info_3")} subscriber_id,
subscriber_ref, part_num, subscription_level, subscription_type,
sd_criteria, event_criteria, awb_number, origin_stn, origin_ctry,
origin_ctry_disp, dest_stn, dest_ctry, dest_ctry_disp,
global_prod_code, local_prod_code, ship_acct, payer_acct, rcvr_acct,
category, ckpt_abbr, status_code, ship_ref, ec_charge_type,
registration_dt, subscrib_status, gsub_output_format, piece_id,
origin_route, origin_zip, dest_zip, originator, instance_id
from subscription_info
where
(
(ship_acct = "850557039" and payer_acct is NULL and rcvr_acct is NULL) or
(payer_acct = "" and ship_acct is NULL and rcvr_acct is NULL) or
(rcvr_acct = "" and ship_acct is NULL and payer_acct is NULL) or
(ship_acct = "850557039" and payer_acct = "" and rcvr_acct is NULL) or
(ship_acct = "850557039" and rcvr_acct = "" and payer_acct is NULL) or
(payer_acct = "" and rcvr_acct = "" and ship_acct is NULL) or
((payer_acct = "") or (rcvr_acct = "") or (ship_acct = "850557039"))
or
( (payer_acct="850557039") or (payer_acct="") or (payer_acct="") )
or
( (rcvr_acct="850557039") or (rcvr_acct="") or (rcvr_acct="") )
or
( (ship_acct="850557039") or (ship_acct="") or (ship_acct="") )
)
and subscrib_status = "ACT" and subscription_type IN ('K','k')
DIRECTIVES FOLLOWED:
INDEX ( subscription_info i_sub_info_3 )
DIRECTIVES NOT FOLLOWED:
Estimated Cost: 23949
Estimated # of Rows Returned: 3
1) gsubadm.subscription_info: INDEX PATH
Filters: (gsubadm.subscription_info.subscrib_status = 'ACT' AND
(((((((((((gsubadm.subscription_info.ship_acct = '850557039' AND
gsubadm.subscription_info.payer_acct IS NULL ) AND
gsubadm.subscription_info.rcvr_acct IS NULL ) OR
((gsubadm.subscription_info.payer_acct = '' AND
gsubadm.subscription_info.ship_acct IS NULL ) AND
gsubadm.subscription_info.rcvr_acct IS NULL ) ) OR
((gsubadm.subscription_info.rcvr_acct = '' AND
gsubadm.subscription_info.ship_acct IS NULL ) AND
gsubadm.subscription_info.payer_acct IS NULL ) ) OR
((gsubadm.subscription_info.ship_acct = '850557039' AND
gsubadm.subscription_info.payer_acct = '' ) AND
gsubadm.subscription_info.rcvr_acct IS NULL ) ) OR
((gsubadm.subscription_info.ship_acct = '850557039' AND
gsubadm.subscription_info.rcvr_acct = '' ) AND
gsubadm.subscription_info.payer_acct IS NULL ) ) OR
((gsubadm.subscription_info.payer_acct = '' AND
gsubadm.subscription_info.rcvr_acct = '' ) AND
gsubadm.subscription_info.ship_acct IS NULL ) ) OR
((gsubadm.subscription_info.payer_acct = '' OR
gsubadm.subscription_info.rcvr_acct = '' ) OR
gsubadm.subscription_info.ship_acct = '850557039' ) ) OR
((gsubadm.subscription_info.payer_acct = '850557039' OR
gsubadm.subscription_info.payer_acct = '' ) OR
gsubadm.subscription_info.payer_acct = '' ) ) OR
((gsubadm.subscription_info.rcvr_acct = '850557039' OR
gsubadm.subscription_info.rcvr_acct = '' ) OR
gsubadm.subscription_info.rcvr_acct = '' ) ) OR
((gsubadm.subscription_info.ship_acct = '850557039' OR
gsubadm.subscription_info.ship_acct = '' ) OR
gsubadm.subscription_info.ship_acct = '' ) ) )
(1) Index Keys: ship_acct payer_acct rcvr_acct subscription_type (Key-First)
(Serial, fragments: ALL)
Index Key Filters: (gsubadm.subscription_info.subscription_type IN ('K' , 'k'
))
QUERY: (Original SQL without INDEX Directives)
------
select subscriber_id,
subscriber_ref, part_num, subscription_level, subscription_type,
sd_criteria, event_criteria, awb_number, origin_stn, origin_ctry,
origin_ctry_disp, dest_stn, dest_ctry, dest_ctry_disp,
global_prod_code, local_prod_code, ship_acct, payer_acct, rcvr_acct,
category, ckpt_abbr, status_code, ship_ref, ec_charge_type,
registration_dt, subscrib_status, gsub_output_format, piece_id,
origin_route, origin_zip, dest_zip, originator, instance_id
from subscription_info
where
(
(ship_acct = "850557039" and payer_acct is NULL and rcvr_acct is NULL) or
(payer_acct = "" and ship_acct is NULL and rcvr_acct is NULL) or
(rcvr_acct = "" and ship_acct is NULL and payer_acct is NULL) or
(ship_acct = "850557039" and payer_acct = "" and rcvr_acct is NULL) or
(ship_acct = "850557039" and rcvr_acct = "" and payer_acct is NULL) or
(payer_acct = "" and rcvr_acct = "" and ship_acct is NULL) or
((payer_acct = "") or (rcvr_acct = "") or (ship_acct = "850557039"))
or
( (payer_acct="850557039") or (payer_acct="") or (payer_acct="") )
or
( (rcvr_acct="850557039") or (rcvr_acct="") or (rcvr_acct="") )
or
( (ship_acct="850557039") or (ship_acct="") or (ship_acct="") )
)
and subscrib_status = "ACT" and subscription_type IN ('K','k')
Estimated Cost: 4
Estimated # of Rows Returned: 3
1) gsubadm.subscription_info: INDEX PATH
Filters: (((((((((((gsubadm.subscription_info.ship_acct = '850557039' AND
gsubadm.subscription_info.payer_acct IS NULL ) AND
gsubadm.subscription_info.rcvr_acct IS NULL ) OR
((gsubadm.subscription_info.payer_acct = '' AND
gsubadm.subscription_info.ship_acct IS NULL ) AND
gsubadm.subscription_info.rcvr_acct IS NULL ) ) OR
((gsubadm.subscription_info.rcvr_acct = '' AND
gsubadm.subscription_info.ship_acct IS NULL ) AND
gsubadm.subscription_info.payer_acct IS NULL ) ) OR
((gsubadm.subscription_info.ship_acct = '850557039' AND
gsubadm.subscription_info.payer_acct = '' ) AND
gsubadm.subscription_info.rcvr_acct IS NULL ) ) OR
((gsubadm.subscription_info.ship_acct = '850557039' AND
gsubadm.subscription_info.rcvr_acct = '' ) AND
gsubadm.subscription_info.payer_acct IS NULL ) ) OR
((gsubadm.subscription_info.payer_acct = '' AND
gsubadm.subscription_info.rcvr_acct = '' ) AND
gsubadm.subscription_info.ship_acct IS NULL ) ) OR
((gsubadm.subscription_info.payer_acct = '' OR
gsubadm.subscription_info.rcvr_acct = '' ) OR
gsubadm.subscription_info.ship_acct = '850557039' ) ) OR
((gsubadm.subscription_info.payer_acct = '850557039' OR
gsubadm.subscription_info.payer_acct = '' ) OR
gsubadm.subscription_info.payer_acct = '' ) ) OR
((gsubadm.subscription_info.rcvr_acct = '850557039' OR
gsubadm.subscription_info.rcvr_acct = '' ) OR
gsubadm.subscription_info.rcvr_acct = '' ) ) OR
((gsubadm.subscription_info.ship_acct = '850557039' OR
gsubadm.subscription_info.ship_acct = '' ) OR
gsubadm.subscription_info.ship_acct = '' ) )
(1) Index Keys: subscription_type subscrib_status (Serial, fragments: ALL)
Lower Index Filter: (gsubadm.subscription_info.subscrib_status = 'ACT' AND
gsubadm.subscription_info.subscription_type = 'K' )
(2) Index Keys: subscription_type subscrib_status (Serial, fragments: ALL)
Lower Index Filter: (gsubadm.subscription_info.subscrib_status = 'ACT' AND
gsubadm.subscription_info.subscription_type = 'k' )
regards, BK
*******************************************************************************
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Messages In This Thread

Why index directive has higher cost?
TAN BK -- Friday, 9 March 2007, at 3:54 a.m.
- Re: Why index directive has higher cost?
  Obnoxio The Clown -- Friday, 9 March 2007, at 4:10 a.m.
- Re: Why index directive has higher cost?
  ART KAGEL, BLOOMBERG/ 731 LEXIN -- Friday, 9 March 2007, at 7:37 a.m.

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