When to enable read only in MySQL replication?
When it is enabled, the server permits no updates except from users that have the SUPER privilege or (on a slave server) from updates performed by slave threads. In replication setups, it can be useful to enable read_only on slave servers to ensure that slaves accept updates only from the master server and not from clients.
How does group replication work in MySQL server?
MySQL Group Replication is a MySQL Server plugin that enables you to create elastic, highly-available, fault-tolerant replication topologies. Groups can operate in a single-primary mode with automatic primary election, where only one server accepts updates at a time.
What should backup period be for MySQL read replicas?
Before a MySQL DB instance can serve as a replication source, make sure to enable automatic backups on the source DB instance. To do this, set the backup retention period to a value other than 0. This requirement also applies to a read replica that is the source DB instance for another read replica.
Should a replication slave be set to read only?
In replication setups, it can be useful to enable read_only on slave servers to ensure that slaves accept updates only from the master server and not from clients. Thus, anyone with SUPER privilege can read and write at will to such a Slave… Make sure all non-privileged users do not have the SUPER Privilege.
What happens when MySQL slave is read only?
When a Slave is read-only, it is not 100% shielded from the world. According to MySQL Documentation on read-only This variable is off by default. When it is enabled, the server permits no updates except from users that have the SUPER privilege or (on a slave server) from updates performed by slave threads.
How many read replicas in azure database for MySQL?
Read replicas in Azure Database for MySQL. The read replica feature allows you to replicate data from an Azure Database for MySQL server to a read-only server. You can replicate from the master server to up to five replicas.