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When to use row based replication in MySQL?
Row-based replication allows extra columns to exist at the end of the table, so as long as it is able to write the first columns it will be fine. First apply the change to all slaves, then failover to one of the slaves and then apply the change to the master and attach that as a slave.
Which is better for parallel replication MariaDB or MySQL?
To get around this, both MariaDB and MySQL offer parallel replication. The implementation may differ per vendor and version. MySQL 5.6 offers parallel replication as long as the queries are separated by schema. MariaDB 10.0 and MySQL 5.7 both can handle parallel replication across schemas, but have other boundaries.
What happens to the replication thread in MySQL?
Causes the server to record more messages to the error log about what it is doing. With respect to replication, the server generates warnings that it succeeded in reconnecting after a network or connection failure, and provides information about how each replication thread started. This variable is set to 2 by default.
How to create a unique replication ID in MySQL?
On the source and each replica, you must set the server_id system variable to establish a unique replication ID in the range from 1 to 2 32 − 1. “Unique” means that each ID must be different from every other ID in use by any other source or replica in the replication topology.
Row-based Replication was introduced in MySQL 5.1. It’s not the default (yet), but I really like it. I wanted to tell you what limitations you may face with statement-based, and why you should join me in making the switch. Statement based binary logging requires additional locking to ensure slave-consistency.
When to use row based logging in MySQL?
By Justin SwanhartInsight for DBAs, MySQLHigh Availability, Recovery, Replication, row based logging, Tips14 Comments MySQL 5.1 introduces row-based binary logging.
Which is better row based replication or binary log?
By contrast, row-based replication writes each changed row to the binary log. If the statement changes many rows, row-based replication may write significantly more data to the binary log; this is true even for statements that are rolled back. This also means that making and restoring a backup can require more time.
What are the advantages of RBR in MySQL?
Fewer row locks are required on the replica for any INSERT , UPDATE, or DELETE statement. RBR can generate more data that must be logged. To replicate a DML statement (such as an UPDATE or DELETE statement), statement-based replication writes only the statement to the binary log.
Why does MySQL replication stall the replication stream?
This has to do with the fact that a DDL change will most of the time lock a table and only release this lock once the DDL change has been applied. It even gets worse once you start replicating these DDL changes through MySQL replication, where it will in addition stall the replication stream.
When to stop slave thread in row based replication?
When row based replication detects data drift, it will stop the slave thread to prevent making things worse. Then there is a method in between these two: mixed mode replication.
When to use mixed mode in MySQL replication?
This type of replication will always replicate statements, except when the query contains the UUID () function, triggers, stored procedures, UDFs and a few other exceptions are used. Mixed mode will not solve the issue of data drift and, together with statement-based replication, should be avoided.
Why does MySQL replication need to be single threaded?
Since (traditional) MySQL replication is single threaded, any long running query in the replication may stall the whole ring. Also if any of the servers would go down, the ring would be broken and currently there is no failover software that can repair ring structures.