Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3 - Mailing list pgsql-performance

I have attached the requested information.

You will see that the query is quite messy and could be easily improved.
Unfortunately, it came from a third party application and we do not have
access to the source code.

Thanks for your help,

Best Regards,
Vincent




Michael Fuhr wrote:
> On Tue, Mar 13, 2007 at 09:19:47AM +0100, vincent.moreau@leroymerlin.fr wrote:
>
>> Is there an option in the 8.2.3 to change in order to have the same
>> execution plan than before ?
>>
>
> Let's see if we can figure out why 8.2.3 is choosing a bad plan.
> Have you run ANALYZE on the tables in 8.2.3?  Could you post the
> query and the complete output of EXPLAIN ANALYZE (preferably without
> wrapping) for both versions?
>
>


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-bash-2.05b$ psql CCM 
Welcome to psql 8.2.3, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

CCM=# VACUUM FULL ANALYZE ;
VACUUM
CCM=# explain ANALYZE SELECT distinct C.cod_couleur_panneau, C.cod_couleur_panneau, cast ('LM05' as varchar), cast
('OMM_TEINTE'as varchar), cast ('IM' as varchar) FROM lm05_t_modele AS A, lm05_t_couleur_panneau AS C,
lm05_t_infos_modeleAS D, lm05_t_tarif_panneau AS G , lm05_t_composition AS E , lm05_t_couleur_profile AS F ,
cm_gestion_modele_caas H, mag_gestion_modele_mag as I WHERE A.cod_type_ouverture = 'OUV_COU' AND A.cod_type_panneau =
'PAN_MEL'AND A.cod_modele = C.cod_modele AND A.cod_modele = D.cod_modele AND A.cod_modele = G.cod_modele AND
G.cod_tarif_panneau= C.cod_tarif_panneau AND A.cod_modele = E.cod_modele AND nb_vantaux >= 2 AND A.cod_modele =
F.cod_modeleAND F.couleur_profile = 'acajou mat' AND F.cod_tarif_profile = G.cod_tarif_profile AND A.cod_fournisseur =
'5132'AND A.cod_gamme_prof = 'Design Xtra' AND C.ht_min < 2000 AND C.ht_max >= 2000 AND D.largeur_maxi_rail >= 1000 AND
C.cod_aspect= 'tons bois et cuirs' AND C.cod_gamme_panneau = 'BOIS et CUIR XTRA 3' AND ((G.lrg_min < 1000 AND G.lrg_max
>=1000) OR (G.lrg_min < 500 AND G.lrg_max >= 500) OR (G.lrg_min < 333.333333333333 AND G.lrg_max >= 333.333333333333)
OR(G.lrg_min < 250 AND G.lrg_max >= 250) OR (G.lrg_min < 200 AND G.lrg_max >= 200) OR (G.lrg_min < 166.666666666667 AND
G.lrg_max>= 166.666666666667) OR (G.lrg_min < 142.857142857143 AND G.lrg_max >= 142.857142857143) OR (G.lrg_min < 125
ANDG.lrg_max >= 125) OR (G.lrg_min < 111.111111111111 AND G.lrg_max >= 111.111111111111) OR (G.lrg_min < 100 AND
G.lrg_max>= 100)) AND H.idmagasin = '011' AND H.idoav='PC_PLACARD' AND H.cod_modele = A.cod_modele AND H.autorise = 1
ANDI.idmagasin = '011' AND I.idoav='PC_PLACARD' AND I.cod_modele = A.cod_modele AND I.selection = 1;
 

 
 

 
 
                                                                                          QUERY PLAN
 
 

 
 

 
 
                                                                    

--------------------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------
 Unique  (cost=5276.93..5276.95 rows=1 width=32) (actual time=28977.716..28980.225 rows=140 loops=1)
   ->  Sort  (cost=5276.93..5276.94 rows=1 width=32) (actual time=28977.712..28978.464 rows=1400 loops=1)
         Sort Key: c.cod_couleur_panneau, c.cod_couleur_panneau, 'LM05'::character varying, 'OMM_TEINTE'::character
varying,'IM'::character varying
 
         ->  Nested Loop  (cost=6.31..5276.92 rows=1 width=32) (actual time=111.982..28945.376 rows=1400 loops=1)
               Join Filter: (a.cod_modele = d.cod_modele)
               ->  Nested Loop  (cost=6.31..5268.80 rows=1 width=60) (actual time=111.790..28626.234 rows=1400
loops=1)
                     Join Filter: (a.cod_modele = e.cod_modele)
                     ->  Nested Loop  (cost=6.31..5246.81 rows=1 width=56) (actual time=111.026..28406.507 rows=280
loops=1)
                           Join Filter: ((a.cod_modele = f.cod_modele) AND ((f.cod_tarif_profile)::text =
(g.cod_tarif_profile)::text))
                           ->  Nested Loop  (cost=6.31..5147.63 rows=1 width=70) (actual time=94.114..27028.607
rows=1120loops=1)
 
                                 Join Filter: (h.cod_modele = a.cod_modele)
                                 ->  Nested Loop  (cost=6.31..4634.34 rows=1 width=66) (actual time=87.369..20023.134
rows=1120loops=1)
 
                                       Join Filter: (i.cod_modele = a.cod_modele)
                                       ->  Nested Loop  (cost=6.31..4623.51 rows=1 width=62) (actual
time=87.018..19664.375rows=1120 loops=1)
 
                                             Join Filter: ((a.cod_modele = c.cod_modele) AND
((g.cod_tarif_panneau)::text= (c.cod_tarif_panneau)::text))
 
                                             ->  Seq Scan on lm05_t_couleur_panneau c  (cost=0.00..1565.60 rows=1
width=62)(actual time=23.551..28.649 rows=280 loops=1)
 
                                                   Filter: ((ht_min < 2000) AND (ht_max >= 2000) AND
((cod_aspect)::text= 'tons bois et cuirs'::text) AND ((cod_gamme_panneau)::text = 'BOIS et CUIR XTRA 3'::text))
 
                                             ->  Hash Join  (cost=6.31..3056.17 rows=116 width=47) (actual
time=60.055..70.078rows=48 loops=280)
 
                                                   Hash Cond: (g.cod_modele = a.cod_modele)
                                                   ->  Seq Scan on lm05_t_tarif_panneau g  (cost=0.00..2977.08
rows=19097width=43) (actual time=0.008..67.670 rows=4062 loops=280)
 
                                                         Filter: (((lrg_min < 1000) AND (lrg_max >= 1000)) OR ((lrg_min
<500) AND (lrg_max >= 500)) OR (((lrg_min)::numeric < 333.333333333333) AND ((lrg_max)::numeric >= 333.333333333333))
OR((lrg_min < 250) AND (lrg_max >= 250)) OR ((lrg_min < 200) AND (lrg_max >= 200)) OR (((lrg_min)::numeric <
166.666666666667)AND ((lrg_max)::numeric >= 166.666666666667)) OR (((lrg_min)::numeric < 142.857142857143) AND
((lrg_max)::numeric>= 142.857142857143)) OR ((lrg_min < 125) AND (lrg_max >= 125)) OR (((lrg_min)::numeric <
111.111111111111)AND ((lrg_max)::numeric >= 111.111111111111)) OR ((lrg_min < 100) AND (lrg_max >= 100)))
 
                                                   ->  Hash  (cost=6.30..6.30 rows=1 width=4) (actual time=0.114..0.114
rows=1loops=1)
 
                                                         ->  Seq Scan on lm05_t_modele a  (cost=0.00..6.30 rows=1
width=4)(actual time=0.040..0.109 rows=1 loops=1)
 
                                                               Filter: (((cod_type_ouverture)::text = 'OUV_COU'::text)
AND((cod_type_panneau)::text = 'PAN_MEL'::text) AND (cod_fournisseur = 5132) AND ((cod_gamme_prof)::text = 'Design
Xtra'::text))
                                       ->  Seq Scan on mag_gestion_modele_mag i  (cost=0.00..8.78 rows=165 width=4)
(actualtime=0.058..0.220 rows=165 loops=1120)
 
                                             Filter: (((idmagasin)::text = '011'::text) AND ((idoav)::text =
'PC_PLACARD'::text)AND (selection = 1))
 
                                 ->  Seq Scan on cm_gestion_modele_ca h  (cost=0.00..511.27 rows=161 width=4) (actual
time=0.030..6.152rows=165 loops=1120)
 
                                       Filter: (((idmagasin)::text = '011'::text) AND ((idoav)::text =
'PC_PLACARD'::text)AND (autorise = 1))
 
                           ->  Seq Scan on lm05_t_couleur_profile f  (cost=0.00..98.86 rows=21 width=22) (actual
time=0.849..1.205rows=32 loops=1120)
 
                                 Filter: ((couleur_profile)::text = 'acajou mat'::text)
                     ->  Seq Scan on lm05_t_composition e  (cost=0.00..14.82 rows=573 width=4) (actual
time=0.010..0.465rows=573 loops=280)
 
                           Filter: (nb_vantaux >= 2)
               ->  Seq Scan on lm05_t_infos_modele d  (cost=0.00..6.06 rows=165 width=4) (actual time=0.004..0.136
rows=165loops=1400)
 
                     Filter: (largeur_maxi_rail >= 1000)
 Total runtime: 28980.630 ms
(35 rows)

CCM=# 

-bash-2.05b$ psql CCM
Welcome to psql 7.3.10-RH, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help on internal slash commands
       \g or terminate with semicolon to execute query
       \q to quit

CCM=# EXPLAIN ANALYZE SELECT distinct C.cod_couleur_panneau, C.cod_couleur_panneau, cast ('LM05' as varchar), cast
('OMM_TEINTE'as varchar), cast ('IM' as varchar) FROM lm05_t_modele AS A, lm05_t_couleur_panneau AS C,
lm05_t_infos_modeleAS D, lm05_t_tarif_panneau AS G , lm05_t_composition AS E , lm05_t_couleur_profile AS F ,
cm_gestion_modele_caas H, mag_gestion_modele_mag as I WHERE A.cod_type_ouverture = 'OUV_COU' AND A.cod_type_panneau =
'PAN_MEL'AND A.cod_modele = C.cod_modele AND A.cod_modele = D.cod_modele AND A.cod_modele = G.cod_modele AND
G.cod_tarif_panneau= C.cod_tarif_panneau AND A.cod_modele = E.cod_modele AND nb_vantaux >= 2 AND A.cod_modele =
F.cod_modeleAND F.couleur_profile = 'acajou mat' AND F.cod_tarif_profile = G.cod_tarif_profile AND A.cod_fournisseur =
'5132'AND A.cod_gamme_prof = 'Design Xtra' AND C.ht_min < 2000 AND C.ht_max >= 2000 AND D.largeur_maxi_rail >= 1000 AND
C.cod_aspect= 'tons bois et cuirs' AND C.cod_gamme_panneau = 'BOIS et CUIR XTRA 3' AND ((G.lrg_min < 1000 AND G.lrg_max
>=1000) OR (G.lrg_min < 500 AND G.lrg_max >= 500) OR (G.lrg_min < 333.333333333333 AND G.lrg_max >= 333.333333333333)
OR(G.lrg_min < 250 AND G.lrg_max >= 250) OR (G.lrg_min < 200 AND G.lrg_max >= 200) OR (G.lrg_min < 166.666666666667 AND
G.lrg_max>= 166.666666666667) OR (G.lrg_min < 142.857142857143 AND G.lrg_max >= 142.857142857143) OR (G.lrg_min < 125
ANDG.lrg_max >= 125) OR (G.lrg_min < 111.111111111111 AND G.lrg_max >= 111.111111111111) OR (G.lrg_min < 100 AND
G.lrg_max>= 100)) AND H.idmagasin = '011' AND H.idoav='PC_PLACARD' AND H.cod_modele = A.cod_modele AND H.autorise = 1
ANDI.idmagasin = '011' AND I.idoav='PC_PLACARD' AND I.cod_modele = A.cod_modele AND I.selection = 1;
 
                                                                                
                                                                                
                                                                                
                                                                                
              QUERY PLAN                                                        
                                                                                
                                                                                
                                                                                
                                      
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------------------------------
 Unique  (cost=232.48..232.51 rows=1 width=497) (actual time=821.34..839.75 rows=140 loops=1)
   ->  Sort  (cost=232.48..232.49 rows=2 width=497) (actual time=821.34..822.06 rows=1400 loops=1)
         Sort Key: c.cod_couleur_panneau, c.cod_couleur_panneau, 'LM05'::character varying, 'OMM_TEINTE'::character
varying,'IM'::character varying
 
         ->  Hash Join  (cost=208.29..232.47 rows=2 width=497) (actual time=777.53..780.99 rows=1400 loops=1)
               Hash Cond: ("outer".cod_modele = "inner".cod_modele)
               ->  Seq Scan on lm05_t_infos_modele d  (cost=0.00..22.50 rows=333 width=4) (actual time=3.93..4.46
rows=165loops=1)
 
                     Filter: (largeur_maxi_rail >= 1000)
               ->  Hash  (cost=208.28..208.28 rows=1 width=493) (actual time=772.34..772.34 rows=0 loops=1)
                     ->  Hash Join  (cost=184.09..208.28 rows=1 width=493) (actual time=582.72..770.73 rows=1400
loops=1)
                           Hash Cond: ("outer".cod_tarif_profile = "inner".cod_tarif_profile)
                           Join Filter: ("inner".cod_modele = "outer".cod_modele)
                           ->  Hash Join  (cost=161.57..185.76 rows=2 width=396) (actual time=535.31..549.63 rows=5600
loops=1)
                                 Hash Cond: ("outer".cod_modele = "inner".cod_modele)
                                 ->  Seq Scan on lm05_t_composition e  (cost=0.00..22.50 rows=333 width=4) (actual
time=1.75..3.23rows=573 loops=1)
 
                                       Filter: (nb_vantaux >= 2)
                                 ->  Hash  (cost=161.57..161.57 rows=1 width=392) (actual time=531.89..531.89 rows=0
loops=1)
                                       ->  Hash Join  (cost=68.10..161.57 rows=1 width=392) (actual time=418.18..530.57
rows=1120loops=1)
 
                                             Hash Cond: ("outer".cod_modele = "inner".cod_modele)
                                             Join Filter: ("outer".cod_tarif_panneau = "inner".cod_tarif_panneau)
                                             ->  Hash Join  (cost=32.35..125.82 rows=1 width=198) (actual
time=229.95..333.14rows=48 loops=1)
 
                                                   Hash Cond: ("outer".cod_modele = "inner".cod_modele)
                                                   ->  Seq Scan on lm05_t_tarif_panneau g  (cost=0.00..90.00 rows=692
width=190)(actual time=0.31..295.15 rows=4062 loops=1)
 
                                                         Filter: (((lrg_min < 1000) AND (lrg_max >= 1000)) OR ((lrg_min
<500) AND (lrg_max >= 500)) OR (((lrg_min)::numeric < 333.333333333333) AND ((lrg_max)::numeric >= 333.333333333333))
OR((lrg_min < 250) AND (lrg_max >= 250)) OR ((lrg_min < 200) AND (lrg_max >= 200)) OR (((lrg_min)::numeric
<166.666666666667)AND ((lrg_max)::numeric >= 166.666666666667)) OR (((lrg_min)::numeric < 142.857142857143) AND
((lrg_max)::numeric>= 142.857142857143)) OR ((lrg_min < 125) AND (lrg_max >= 125)) OR (((lrg_min)::numeric <
111.111111111111)AND ((lrg_max)::numeric >= 111.111111111111)) OR ((lrg_min < 100) AND (lrg_max >= 100)))
 
                                                   ->  Hash  (cost=32.35..32.35 rows=1 width=8) (actual
time=34.88..34.88rows=0 loops=1)
 
                                                         ->  Nested Loop  (cost=0.00..32.35 rows=1 width=8) (actual
time=33.34..34.87rows=1 loops=1)
 
                                                               ->  Seq Scan on cm_gestion_modele_ca h
(cost=0.00..27.50rows=1 width=4) (actual time=0.14..25.64 rows=165 loops=1)
 
                                                                     Filter: ((idmagasin = '011'::character varying)
AND(idoav = 'PC_PLACARD'::character varying) AND (autorise = 1))
 
                                                               ->  Index Scan using lm05_t_modele_cod_modele_key on
lm05_t_modelea  (cost=0.00..4.83 rows=1 width=4) (actual time=0.05..0.05 rows=0 loops=165)
 
                                                                     Index Cond: ("outer".cod_modele = a.cod_modele)
                                                                     Filter: ((cod_type_ouverture =
'OUV_COU'::charactervarying) AND (cod_type_panneau = 'PAN_MEL'::character varying) AND (cod_fournisseur = 5132) AND
(cod_gamme_prof= 'Design Xtra'::character varying))
 
                                             ->  Hash  (cost=35.75..35.75 rows=1 width=194) (actual time=186.04..186.04
rows=0loops=1)
 
                                                   ->  Hash Join  (cost=30.00..35.75 rows=1 width=194) (actual
time=185.26..185.77rows=280 loops=1)
 
                                                         Hash Cond: ("outer".cod_modele = "inner".cod_modele)
                                                         ->  Seq Scan on mag_gestion_modele_mag i  (cost=0.00..4.91
rows=166width=4) (actual time=0.05..1.15 rows=166 loops=1)
 
                                                               Filter: ((idmagas
in = '011'::character varying) AND (idoav = 'PC_PLACARD'::character varying) AND
 (selection = 1))
                                                         ->  Hash  (cost=30.00..30.00 rows=1 width=190) (actual
time=183.99..183.99rows=0 loops=1)
 
                                                               ->  Seq Scan on lm05_t_couleur_panneau c
(cost=0.00..30.00rows=1 width=190) (actual time=146.95..183.67 rows=280 loops=1)
 
                                                                     Filter: ((ht_min < 2000) AND (ht_max >= 2000) AND
(cod_aspect= 'tons bois et cuirs'::character varying) AND (cod_gamme_panneau = 'BOIS et CUIR XTRA 3'::character
varying))
                           ->  Hash  (cost=22.50..22.50 rows=5 width=97) (actual time=46.82..46.82 rows=0 loops=1)
                                 ->  Seq Scan on lm05_t_couleur_profile f  (cost=0.00..22.50 rows=5 width=97) (actual
time=32.07..46.77rows=32 loops=1)
 
                                       Filter: (couleur_profile = 'acajou mat'::character varying)
 Total runtime: 840.40 msec
(42 rows)

CCM=#