Can a slave be replicated to a different column?

Can a slave be replicated to a different column?

It is possible in some cases to replicate to a slave that has a column of a different type on the slave and the master. This process is called attribute promotion (to a larger type) or attribute demotion (to a smaller type). The conditions differ depending on whether statement-based or row-based replication is used.

When does replication increment the identity column value?

When replication inserts data at each Subscriber, it does not increment the identity column value in the Subscriber table; instead, the literal value 65 is inserted. Only user inserts, but not replication agent inserts cause the identity column value to be incremented.

Why are identity columns important in replication topology?

Because identity columns might be included as a part of the primary key, it is important to avoid duplicate values in the identity columns. To use identity columns in a replication topology that has updates at more than one node, each node in the replication topology must use a different range of identity values, so that duplicates do not occur.

Where is the not for replication option in SQL Server?

Replication sets the NOT FOR REPLICATION option on the identity column at the Subscriber. None. This option is recommended only for backwards compatibility with earlier versions of SQL Server and is available only from the stored procedure interface for transactional publications.

How to know MySQL replication status using a SELECT query?

FROM performance_schema.replication_applier_status_by_worker This shows the most recent error on the same row as the SECONDS_BEHIND_MASTER. If this value is non-zero, it’s possible there is a large query running, or there’s an error that you would find in the show slave status; command, or you could find it in the performance_schema.

When do master and slave have different table definitions?

If a column definition is the same or a larger type on the slave than on the master, it can replicate successfully. For example a column defined as VARCHAR (10) will successfully be replicated on a slave with a definition of VARCHAR (12).

What’s the difference between master and slave in replication?

The terms master and slave have historically been used in replication, but the terms terms primary and replica are now preferred. The old terms are used throughout the documentation, and in MariaDB commands, although MariaDB 10.5 has begun the process of renaming.

How to tell slave to start replicating from Master?

You’ll use this to tell the slave at exactly which point it should start replicating from. On the master, flush and lock all tables by running FLUSH TABLES WITH READ LOCK. Keep this session running – exiting it will release the lock. Record the File and Position details.

Can You replicate from MySQL master to MariaDB slave?

In general, when replicating across different versions of MariaDB, it is best that the master is an older version than the slave. MariaDB versions are usually backward compatible, while of course older versions cannot always be forward compatible. See also Replicating from MySQL Master to MariaDB Slave.

How many slaves do I need for MySQL replication?

See Activating the Binary Log and Binary log formats for details. Give the master a unique server_id. All slaves must also be given a server_id. This can be a number from 1 to 2 32 -1, and must be unique for each server in the replicating group.