Module 8 operation

One 、 Homework ： Design message queue to store message data  MySQL  form

【 Job requirements 】

1.  Include table name 、 Field 、 Indexes ;

2.  Use words to describe the design ideas and reasons , for example ： Why design an index ？

3.  One page  PPT  that will do .

【 Tips 】

1.  You need to consider one table per message queue , Or put all the messages in one table , Add a “ Queue name ” Field of .

Two 、 Table design

CREATE TABLE 

topic_{xxx}

 (

id

 bigint(11) unsigned NOT NULL AUTO_INCREMENT COMMENT ' news  id',

content

 text NOT NULL COMMENT ' The message content ',

producer_id

 bigint(11) unsigned NOT NULL COMMENT ' producer  id',

consumer_id

 bigint(11) unsigned NOT NULL COMMENT ' consumer  id',

consumer_status

 tinyint(1) unsigned NOT NULL DEFAULT '0' COMMENT ' Consumption ,0  newly build  1  Consumption success  2  Consumption failure  3  Need retry ',

create_time

 bigint(11) unsigned NOT NULL COMMENT ' Creation time ',

update_time

 bigint(11) unsigned NOT NULL COMMENT ' Update time ',

PRIMARY KEY (

id

),

KEY 

idx_consumer_situation

 (

consumer_id

,

consumer_status

),

KEY 

idx_producer

 (

producer_id

)

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

3、 ... and 、 Design thinking

Put all the messages in one table , The later expansibility is not good , When a certain amount of data is reached, a sub table must be made . Instead, it's better to create a table directly according to the queue , For example, above  topic_ Is the prefix of the queue , hinder {xxx} You need to replace it with a specific queue name .

Field description ：

It has been explained above . I won't repeat .

among  consumer_status  This field determines whether the message has been successfully created 、 Successful consumption 、 Or maybe for some reason , Consumption failed or needs to be retried and marked . The index shows that ：

idx_consumer_situation  This index is to facilitate the query of consumers

producer_id  This index facilitates the query of producers' messages