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MariaDB MaxScale Load Balancer with Master/Master Replication

For this how-to we were working with a MariaDB 10.6.5 database server and the newest MariaDB MaxScale 6.3.0 (aka 2.6) load balancer/proxy.

As a starting point we had a working MariaDB Master/Master replication with one active Master (Ma) and one passive Master (Mp). Whereas the passive Master was set to read_only. As a replication user we used the user replication.

Traffic mirroring with MariaDB MaxScale

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Recently we had the case that a customer claimed that MariaDB 10.3 Binary Log is using 150% more space on disk than MySQL 5.7 Binary Log. Because I never observed something similar, but to be honest, I did not look to intensively for this situation, we had to do some clarifications.

First we checked the usual variables which could be candidates for such a behaviour:

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