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Why does MySQL replication read only on slave database?
Arbitrary or unintended updates to a slave may break replication or cause a slave to be inconsistent with respect to its master. Making a slave read_only can be useful to ensure that a slave accepts updates only from its master server and not from clients; it minimizes the possibility of unintended updates.
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.
How to use replication filters in MySQL read replicas?
You can use replication filters to specify which databases and tables are replicated with a read replica. Replication filters can include databases and tables in replication or exclude them from replication. The following are some use cases for replication filters: To reduce the size of a read replica.
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.
Why is MySQL 5.7 Super read only?
I just learned recently that MySQL 5.7 will introduce super_read_only. If the read_only system variable is enabled, the server permits client updates only from users who have the SUPER privilege. If the super_read_only system variable is also enabled, the server prohibits client updates even from users who have SUPER.
Why do MySQL DBAs use their slaves on Ro?
Because almost all MySQL DBAs use their slaves on RO, to prevent data corruption, and always exists one dba who accidentally run wrongly an SQL that modify data on a slave, or an app that won’t change his conf.
Can a slave server be run with are / O mode?
Yes, you’d better run slave servers with R/O modes available. Previously privileged users could modify such a slave’s data anyways but later then they also got theirs R/O restriction “knob”.