插入到從臨時表的表需要較長時間

Question

上午鄉親，

我有135000行24列，這些行的，我需要他們的約8000插入的8列表的臨時表。如果第一次運行我的插入（即，當我的8列表爲空），它將在大約6秒內運行。當我再次運行相同的查詢時（這一次它不應該插入任何東西，因爲這些行已經被插入）需要30分鐘！

我一直無法用一個簡單的小樣本重新創建這個，但是這裏有一些sql可以運行。當程序表中有導致問題的條目時，它正在運行最後一個插入。任何人都可以闡明爲什麼這可能是什麼？

CREATE TEMPORARY TABLE TVTEMPTABLE (
PROGTITLE TEXT, YR YEAR, DIRECTOR TEXT, GENRE TEXT 
); 

CREATE TABLE GENRE (
GENREID INT NOT NULL AUTO_INCREMENT, GENRE TEXT, PRIMARY KEY(GENREID) 
) ENGINE=INNODB; 

CREATE TABLE PROGRAMME (
PROGRAMMEID INT NOT NULL AUTO_INCREMENT, GENREID INT NOT NULL, PROGTITLE TEXT, YR YEAR, 
DIRECTOR TEXT, PRIMARY KEY(PROGRAMMEID), INDEX (GENREID), FOREIGN KEY (GENREID) REFERENCES GENRE(GENREID) 
) ENGINE=INNODB; 

INSERT INTO GENRE(GENRE) VALUES 
('Consumer'),('Entertainment'),('Comedy'),('Film'),('Drama'),('Sport'), 
('Sitcom'),('Travel'),('Documentary'),('Factual'); 

INSERT INTO TVTEMPTABLE(PROGTITLE, YR, DIRECTOR, GENRE) VALUES 
('Breakfast','2011','n/a','Consumer'),('Breakfast','2011','n/a','Consumer'), 
('Wanted Down Under','2011','n/a','Entertainment'),('Wanted Down Under','2011','n/a','Entertainment'), 
('Lorraine','2011','n/a','Comedy'),('Lorraine','2011','n/a','Comedy'), 
('Supernanny USA','2011','n/a','Film'),('Supernanny USA','2011','n/a','Film'), 
('Three Coins in the Fountain','2011','n/a','Drama'),('Three Coins in the Fountain','2011','n/a','Drama'), 
('The Wright Stuff','2011','n/a','Sport'),('The Wright Stuff','2011','n/a','Sport'), 
('This Morning','2011','n/a','Sitcom'),('This Morning','2011','n/a','Sitcom'), 
('Homes Under the Hammer','2011','n/a','Travel'),('Homes Under the Hammer','2011','n/a','Travel'), 
('LazyTown','2011','n/a','Documentary'),('LazyTown','2011','n/a','Documentary'), 
('Jeremy Kyle','2011','n/a','Factual'),('Jeremy Kyle','2011','n/a','Factual'); 

INSERT INTO PROGRAMME (
    PROGTITLE, GENREID, YR, 
    DIRECTOR) 
SELECT 
    T.PROGTITLE, MAX(G.GENREID), 
    MAX(T.YR), MAX(T.DIRECTOR) 
FROM 
    TVTEMPTABLE T 
    INNER JOIN GENRE G ON G.GENRE=T.GENRE 
    LEFT JOIN PROGRAMME P ON P.PROGTITLE=T.PROGTITLE  
WHERE P.PROGTITLE IS NULL 
GROUP BY T.PROGTITLE; 

編輯：這是你的索引是什麼意思？

CREATE TEMPORARY TABLE TVTEMPTABLE (
PROGTITLE VARCHAR(50), YR YEAR, DIRECTOR TEXT, GENRE VARCHAR(50), INDEX(PROGTITLE,GENRE) 
); 

CREATE TABLE PROGRAMME (
PROGRAMMEID INT NOT NULL AUTO_INCREMENT, GENREID INT NOT NULL, PROGTITLE VARCHAR(50), YR YEAR, 
DIRECTOR TEXT, PRIMARY KEY(PROGRAMMEID), INDEX (GENREID,PROGTITLE), FOREIGN KEY (GENREID) REFERENCES GENRE(GENREID) 
) ENGINE=INNODB; 

編輯2：這是從desc擴展的結果。索引後（我可能做錯了？）。插入仍然需要很長的時間

Answer 1

好的是，答案是正確的索引我的表，我不知道但是是

INDEX(A,B,C); 

是從

INDEX(A),INDEX(B),INDEX(C); 

不同