Wie zu meiner gespeicherten Prozedur machen es schnell und schön ... (Wählen Sie. Wählen Sie. Wählen Sie ..)

Question

Ich bin Junior Ruby-MySQL-Programmierer und ich möchte wissen, wie ich meine Abfrage (gespeicherte Prozedur) schnell machen. .

hier ist mein Stored Procedure und ich bin mit SQL_CACHE .. aber ich bin mir nicht sicher .. der Cache schnell mein Verfahren macht ..: (

DROP PROCEDURE IF EXISTS GET_AV // 
    CREATE PROCEDURE GET_AV() 
    BEGIN 
     DECLARE OVERALL FLOAT ; 
     DECLARE MALE FLOAT ; 
     DECLARE FEMALE FLOAT ; 
     DECLARE UNDER25 FLOAT ; 
     DECLARE ABOVE25 FLOAT ; 
     DECLARE UNDER25MALE FLOAT ; 
     DECLARE UNDER25FEMALE FLOAT ; 
     DECLARE ABOVE25MALE FLOAT ; 
     DECLARE ABOVE25FEMALE FLOAT ; 
     DECLARE CNT FLOAT; 



    #AVERAGE OVERALL 
    select SQL_CACHE avg(r.frq) as AVG_OVERALL INTO OVERALL from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id; 


    #AVERAGE MALE 
    select SQL_CACHE avg(r.frq) as AVG_MALE INTO MALE from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id WHERE GENDER = 1; 

    #AVERAGE FEMALE 
    select SQL_CACHE avg(r.frq) as AVG_FEMALE INTO FEMALE from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id WHERE GENDER = 2; 

    #AVERAGE UNDER25 
    select SQL_CACHE avg(r.frq) as AVG_UNDER_25 INTO UNDER25 from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id where AGE <= 25; 

    #AVERAGE ABOVE25 
    select avg(r.frq) as AVG_ABOVE_25 INTO ABOVE25 from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id where AGE >= 25; 


    #AVERAGE UNDER 25 & MALE 
    select SQL_CACHE avg(r.frq) as AVG_UNDER_25_MALE INTO UNDER25MALE from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id WHERE AGE <= 25 AND GENDER = 1; 

    #AVERAGE UNDER 25 & FEMALE 
    select SQL_CACHE avg(r.frq) as AVG_UNDER_25_FEMALE INTO UNDER25FEMALE from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id WHERE AGE <= 25 AND GENDER = 2; 

    #AVERAGE ABOVE25 & MALE 
    select SQL_CACHE avg(r.frq) as AVG_ABOVE_25_MALE INTO ABOVE25MALE from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id where AGE >=25 AND GENDER = 1; 

    #AVERAGE ABOVE25 & FEMALE 
    select SQL_CACHE avg(r.frq) as AVG_ABOVE_25_FEMALE INTO ABOVE25FEMALE from tbl_survey as s inner join tbl_respondent as r on s.s_id = r.s_id WHERE AGE >= 25 AND GENDER = 2; 







    SELECT OVERALL,MALE,FEMALE,UNDER25 ,ABOVE25 , UNDER25MALE,UNDER25FEMALE , 
    ABOVE25MALE ,ABOVE25FEMALE; 


    END // 

glücklicherweise jetzt nicht zu seinem langsamen .. aber ich möchte wissen, wie man es immer schneller und schöner code way macht :(

Answer 1

BEGIN 
SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED; // These line helps to avoid locking table 

<Your select Query> 

SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ; 
END 

// As you are using same table number of times in the stored procedure 
// You can create temp table for that. This will avoid scan whole table from db. 

CREATE TEMPORARY TABLE IF NOT EXISTS tmptbl_survey ENGINE=MEMORY AS SELECT 
    * FROM tbl_survey 

// Use temp table in the query 

//Then drop temp table 
DROP TABLE tmptbl_survey 

Probieren Sie es viel Glück