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18 the topic

As a programmer, most of the programs we write every day are supported by data. MySql is a powerful tool in data processing. MySql is a powerful tool in data processing. MySql is a powerful tool in data processing.

My answer

The connector
The solution

1. Release the long link periodically and create it again.

2. Mysql 5.7 provides mysql_reset_connection to reset a connection. This operation does not disconnect the connection, but only resets the connection to its initialized state.

The query cache
                                SELECT SQL_CACHE * 
                                    FROM tableA WHERE id = 
                                        9;
                                Copy the code
analyzer

elect * from student 

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'elect * from student' at line 1Copy the code
The optimizer
SELECT * FROM tableA JOIN tableB ON tableA.id = tableB.id WHERE tableA.a1 = 2 AND tableB.b1 = 3Copy the code
actuator
conclusion

Gold and silver and four,A question every day to make the offer easier.

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