我是初级Ruby-mysql程序员,我想知道如何快速制作我的(存储过程)查询结果..
这是我的存储过程 我正在使用SQL_CACHE ..但我不确定..缓存使我的程序变得快...... :(
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 //
幸运的是它现在不太慢..
但我想知道如何让它越来越快速和美丽的代码方式:(
答案 0 :(得分:0)
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
祝你好运