MySQL InnoDB Cluster provides automatic failover to ensure high availability by promoting another node when the primary node fails. It also supports synchronous replication to ensure data consistency across the cluster.

DECIMAL is the best choice for storing exact fixed-point numbers, such as currency, because it does not lose precision, unlike floating-point datatypes like FLOAT and DOUBLE.

Read-write splitting in MySQL InnoDB Cluster improves performance by directing read queries to replica nodes and write queries to the primary node, which is particularly beneficial in read-heavy workloads.

The SHOW GRANTS command is used to display the privileges assigned to a specific user. This is helpful when checking what access levels a user has within the MySQL system.

The REVOKE ALL ON *.* command removes all privileges for the specified user on all databases and tables.