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Practice Exercise 2:

Objectives

View the replication configuration and identify if there are any issues such as replication lag

Scenario

As seen earlier, we have setup the Master-Slave replication for you, now you are tasked to view the replication configuration

Tasks

  • db1 = master
  • db2 = slave
  • Use the command below while running mysql on the slave: 
    SHOW REPLICA STATUS\G
    Here you can see the configuration of the slave. Look for the Seconds_Behind_Master value, which indicates the replication lag in seconds. This value should ideally be close to 0. Any positive value suggests lag.

Conclusion

To understand replication, you need to know it's crucial for building fault-tolerant and scalable database systems. Replication offers data redundancy and allows you to offload read operations to the slave server while keeping your data consistent. It's important to monitor replication lag to make sure your system is running smoothly and to help you identify and resolve potential issues.