Ich habe 2 Tabellen verknüpft:Zeitabfrageleistung links eine Ansicht
describe CONSUMO
Field Type Null Key Default Extra
idconsumo int(11) NO PRI NULL auto_increment
idkey int(11) NO MUL NULL
ip varchar(50) NO Unknown
fechahora datetime NO NULL
describe CONTRATADO
Field Type Null Key Default Extra
idkey int(11) NO PRI NULL auto_increment
idusuario int(11) NO MUL NULL
idproducto int(11) NO MUL NULL
key varchar(64) NO MUL NULL
descripcion varchar(50) YES "API KEY"
peticiones int(11) YES NULL
caducidad datetime YES NULL
und einen Blick (die letzten 30 Tage von NOW()
zurück):
CREATE VIEW `last_30_days` AS
SELECT
DATE_FORMAT((NOW() - INTERVAL ((`units`.`i` + (`tens`.`i` * 10)) + (`hundreds`.`i` * 100)) DAY),
'%M %e') AS `fecha`,
DATE_FORMAT((NOW() - INTERVAL ((`units`.`i` + (`tens`.`i` * 10)) + (`hundreds`.`i` * 100)) DAY),
'%Y%m%d') AS `fecha_order`
FROM
((`0_9_range` `units`
JOIN `0_9_range` `tens`)
JOIN `0_9_range` `hundreds`)
WHERE
((NOW() - INTERVAL ((`units`.`i` + (`tens`.`i` * 10)) + (`hundreds`.`i` * 100)) DAY) BETWEEN (NOW() - INTERVAL 1 MONTH) AND NOW())
Immer, wenn ich eine Abfrage ausführen, wie zum Beispiel:
SELECT sub1.fecha, COUNT(idconsumo) as consumo
FROM `last_30_days` `sub1`
LEFT JOIN `CONSUMO` ON sub1.fecha = DATE_FORMAT(fechahora, "%M %e")
LEFT JOIN `CONTRATADO` ON CONSUMO.idkey = CONTRATADO.idkey
WHERE idusuario IS NULL OR idusuario = 1
GROUP BY `sub1`.`fecha`
ORDER BY `sub1`.`fecha_order`
es dauert einige Zeit (~ 20 Sekunden).
Hier ist eine der Abfrage erklären:
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 10 "Using temporary; Using filesort"
1 PRIMARY <derived13> ALL NULL NULL NULL NULL 10 "Using join buffer"
1 PRIMARY <derived23> ALL NULL NULL NULL NULL 10 "Using where; Using join buffer"
1 PRIMARY CONSUMO ALL NULL NULL NULL NULL 908553
1 PRIMARY CONTRATADO eq_ref PRIMARY PRIMARY 4 c1geoapi.CONSUMO.idkey 1 "Using where"
23 DERIVED NULL NULL NULL NULL NULL NULL NULL "No tables used"
24 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
25 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
26 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
27 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
28 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
29 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
30 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
31 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
32 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
NULL "UNION RESULT" <union23,24,25,26,27,28,29,30,31,32> ALL NULL NULL NULL NULL NULL
13 DERIVED NULL NULL NULL NULL NULL NULL NULL "No tables used"
14 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
15 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
16 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
17 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
18 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
19 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
20 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
21 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
22 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
NULL "UNION RESULT" <union13,14,15,16,17,18,19,20,21,22> ALL NULL NULL NULL NULL NULL
3 DERIVED NULL NULL NULL NULL NULL NULL NULL "No tables used"
4 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
5 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
6 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
7 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
8 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
9 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
10 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
11 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
12 UNION NULL NULL NULL NULL NULL NULL NULL "No tables used"
NULL "UNION RESULT" <union3,4,5,6,7,8,9,10,11,12> ALL NULL NULL NULL NULL NULL
Was kann ich tun, um meine Anfrage zu verbessern? Warum dauert das so lange?
Nimmt eine Auswahl aus der Ansicht auch eine lange Zeit in Anspruch? – sagi
Nein, die Auswahl von '*' aus den 'last_30_days' ist so schnell wie es geht. – alexandernst