Scaling Reads with MySQL Replication

Implement Read-Scale Out with Replication

Write MySQL query to help configure read scaling by using replication.

Solution:

-- On the master:
SET GLOBAL binlog_format = 'ROW';
CREATE USER 'read_scale_user'@'%' IDENTIFIED BY 'password';
GRANT SELECT ON *.* TO 'read_scale_user'@'%';

-- On each slave:
CHANGE MASTER TO 
    MASTER_HOST='master_host_ip',
    MASTER_PORT=3306,
    MASTER_USER='repl_user',
    MASTER_PASSWORD='password',
    MASTER_LOG_FILE='mysql-bin.000001',
    MASTER_LOG_POS=154;

START SLAVE;

-- Applications should now direct read queries to slaves:
-- Example in application configuration:
# Use slave for reads
# 'read_scale_user' with appropriate credentials

Explanation:

• Purpose of the Query:
• Configures MySQL for read-scaling by setting up replication to offload read queries from the master.
• Key Components:
• Setting up read-only user accounts on slaves, configuring replication, and directing application read traffic.
• Real-World Application:
• Scales out read operations for better performance under high load.

Notes:

• Ensure applications can dynamically switch read/write operations based on server roles.

For more Practice: Solve these Related Problems:

• Write SQL to configure read scaling where different slaves handle different types of read queries.
• Write SQL to set up a read-scale environment where each slave has a different data subset.

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Previous MySQL Exercise: Handle Replication Errors.