Index et total dup

Bonjour,

J'ai un index qui comprends les 3 champs suivants :
Champ1 Champ2 Champ3
OYFF T5 09/02/2016 09:00:00
OYFF T3 09/02/2016 09:00:00
OYFF T2 09/02/2016 09:00:00
OYFF T4 09/02/2016 09:00:00
OYFF T1 09/02/2016 09:00:00
2CEVV T3 09/02/2016 09:00:00
1VINC T4 09/02/2016 09:00:00
CEHOC T2 09/02/2016 09:00:00
BEVR T2 09/02/2016 09:00:00
1VINC T2 09/02/2016 09:00:00
BEVR T1 09/02/2016 09:00:00
CEHOC T1 09/02/2016 09:00:00
ARFO T5 09/02/2016 09:00:00
2CEVf T4 09/02/2016 09:00:00
2CEVf T1 09/02/2016 09:00:00
ARFO T3 09/02/2016 09:00:00
ASTC T2 09/02/2016 09:00:00
ASTC T4 09/02/2016 09:00:00
ADFDS T4 09/02/2016 09:00:00
2CEVV T4 09/02/2016 09:00:00
2CEVf T5 09/02/2016 09:00:00
ADFDS T2 09/02/2016 09:00:00
2CEVV T1 09/02/2016 09:00:00

L'ensemble de ces 3 champs est normalement unique et pourtant j'ai un total dup (qui représente le nombre de clés dupliqués?) qui est proche de keys.
J'ai : Depth Keys Key Len Max Dup Total Dup Uniques Size, mb AvgFill
3 22820364 0.22 19 21350966 1469398 131.05 100
Merci

Salut Calou_33.

J'ai repris ton exemple et j'ai mis des statistiques afin de voir ce que cela donne :

Code:

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CREATE DATABASE '..\Data\Base.fdb' page_size 4096 DEFAULT CHARACTER SET ISO8859_1;   set stats on;   -- =========================== -- Création de la table 'test' -- ===========================   create table test ( champ1 char(05) NOT NULL collate fr_fr, champ2 char(02) NOT NULL collate fr_fr, champ3 timestamp NOT NULL ); Current memory = 3181168 Delta memory = 565176 Max memory = 3227880 Elapsed time= 0.023 sec Buffers = 256 Reads = 71 Writes = 43 Fetches = 774   -- ========================= -- Création Index sur 'test' -- =========================   create unique index idx on test (champ1,champ2,champ3); Current memory = 3410432 Delta memory = 227200 Max memory = 3523448 Elapsed time= 0.009 sec Buffers = 256 Reads = 7 Writes = 13 Fetches = 318   -- ===================== -- Insertion dans 'test' -- =====================   insert into test (champ1,champ2,champ3) values ('OYFF', 'T5', '09/02/2016 09:00:00'); Current memory = 3526016 Delta memory = 113520 Max memory = 3596960 Elapsed time= 0.002 sec Buffers = 256 Reads = 2 Writes = 0 Fetches = 73 insert into test (champ1,champ2,champ3) values ('OYFF', 'T3', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 472 Max memory = 3596960 Elapsed time= 0.000 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('OYFF', 'T2', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.000 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('OYFF', 'T4', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('OYFF', 'T1', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('2CEVV', 'T3', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('1VINC', 'T4', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('CEHOC', 'T2', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('BEVR', 'T2', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('1VINC', 'T2', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('BEVR', 'T1', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('CEHOC', 'T1', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('ARFO', 'T5', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.003 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('2CEVf', 'T4', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.000 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('2CEVf', 'T1', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.004 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('ARFO', 'T3', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.000 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('ASTC', 'T2', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('ASTC', 'T4', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('ADFDS', 'T4', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.000 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('2CEVV', 'T4', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.002 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('2CEVf', 'T5', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.001 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('ADFDS', 'T2', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.000 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6 insert into test (champ1,champ2,champ3) values ('2CEVV', 'T1', '09/02/2016 09:00:00'); Current memory = 3526488 Delta memory = 0 Max memory = 3596960 Elapsed time= 0.000 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 6   -- ================ -- Vidage de 'test' -- ================   select * from test;   CHAMP1 CHAMP2 CHAMP3 ====== ====== ========================= OYFF T5 2016-09-02 09:00:00.0000 OYFF T3 2016-09-02 09:00:00.0000 OYFF T2 2016-09-02 09:00:00.0000 OYFF T4 2016-09-02 09:00:00.0000 OYFF T1 2016-09-02 09:00:00.0000 2CEVV T3 2016-09-02 09:00:00.0000 1VINC T4 2016-09-02 09:00:00.0000 CEHOC T2 2016-09-02 09:00:00.0000 BEVR T2 2016-09-02 09:00:00.0000 1VINC T2 2016-09-02 09:00:00.0000 BEVR T1 2016-09-02 09:00:00.0000 CEHOC T1 2016-09-02 09:00:00.0000 ARFO T5 2016-09-02 09:00:00.0000 2CEVf T4 2016-09-02 09:00:00.0000 2CEVf T1 2016-09-02 09:00:00.0000 ARFO T3 2016-09-02 09:00:00.0000 ASTC T2 2016-09-02 09:00:00.0000 ASTC T4 2016-09-02 09:00:00.0000 ADFDS T4 2016-09-02 09:00:00.0000 2CEVV T4 2016-09-02 09:00:00.0000   CHAMP1 CHAMP2 CHAMP3 ====== ====== ========================= 2CEVf T5 2016-09-02 09:00:00.0000 ADFDS T2 2016-09-02 09:00:00.0000 2CEVV T1 2016-09-02 09:00:00.0000   Current memory = 3530480 Delta memory = 3992 Max memory = 3596960 Elapsed time= 0.119 sec Buffers = 256 Reads = 0 Writes = 0 Fetches = 51   -- ==== -- Show -- ====   Show table test; CHAMP1 CHAR(5) CHARACTER SET ISO8859_1 Not Null COLLATE FR_FR CHAMP2 CHAR(2) CHARACTER SET ISO8859_1 Not Null COLLATE FR_FR CHAMP3 TIMESTAMP Not Null Show Indexes test; IDX UNIQUE INDEX ON TEST(CHAMP1, CHAMP2, CHAMP3)   exit;   Database "E:\23.FIREBIRD\99.EXERCICES\DATA\BASE.FDB" Database header page information: Flags 0 Generation 10 System Change Number 0 Page size 4096 ODS version 12.0 Oldest transaction 1 Oldest active 2 Oldest snapshot 2 Next transaction 7 Sequence number 0 Next attachment ID 1 Implementation HW=AMD/Intel/x64 little-endian OS=Windows CC=MSVC Shadow count 0 Page buffers 0 Next header page 0 Database dialect 3 Creation date Feb 5, 2016 11:29:39 Attributes force write   Variable header data: *END*     Database file sequence: File E:\23.FIREBIRD\99.EXERCICES\DATA\BASE.FDB is the only file   Analyzing database pages ... TEST (128) Primary pointer page: 224, Index root page: 225 Total formats: 1, used formats: 1 Average record length: 23.00, total records: 23 Average version length: 0.00, total versions: 0, max versions: 0 Average fragment length: 0.00, total fragments: 0, max fragments: 0 Average unpacked length: 24.00, compression ratio: 1.04 Pointer pages: 1, data page slots: 1 Data pages: 1, average fill: 23% Primary pages: 1, secondary pages: 0, swept pages: 0 Empty pages: 0, full pages: 0 Fill distribution: 0 - 19% = 0 20 - 39% = 1 40 - 59% = 0 60 - 79% = 0 80 - 99% = 0   Index IDX (0) Root page: 228, depth: 1, leaf buckets: 1, nodes: 23 Average node length: 25.70, total dup: 0, max dup: 0 Average key length: 24.65, compression ratio: 1.35 Average prefix length: 11.65, average data length: 21.70 Clustering factor: 1, ratio: 0.04 Fill distribution: 0 - 19% = 1 20 - 39% = 0 40 - 59% = 0 60 - 79% = 0 80 - 99% = 0     Appuyez sur une touche pour continuer...

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Dans la partie statistique sur l'index idx, dup = 0.
Il y a bien un index sur ces trois colonnes et il est unique.

Peut-on savoir comment as-tu déclaré ta table et ton index ?

@+

Merci beaucoup!
Je n'étais pas sûr de ma compréhension de total dup. Du coup j'ai bien regardé la table et ca m'a permis de voir qu'il y avait un bug! En effet des valeurs sont dupliquées