Ensuring continuity and open collaboration

MariaDB 10.1.1: Galera support

MariaDB 10.1 server is now “Galera ready” with the latest 10.1.1 release. It includes wsrep (write set replication) patch that enables server to load the wsrep provider (galera) library and interact with it to provide multi-master synchronous replication support. The patch implements hooks inside server and storage engines to populate and apply the write sets […]

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MariaDB 10.1.1: triggers for RBR

Sometimes users ask for something that doesn’t really make sense. On the first glance. But then you start asking and realize that the user was right, you were wrong, and it is, actually, a perfectly logical and valid use case. I’ve had one of these moments when I’ve heard about a request of making triggers […]

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MariaDB 10.1.1: engine_condition_pushdown flag deprecated

Let me start with a little story. You sit in your house near the fireplace in the living room and need a book from the library… Eh, no, sorry, wrong century. You’re building a robotic arm that will open your beer or brew your coffee or supply you with whatever other drinks of your choice… […]

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MariaDB 10.1.1: system variables and their metadata

I don’t think it’ll surprise anybody if I say that MariaDB or MySQL server knows a lot more about server system variables, then just their values. Indeed, every variable can be session or global only, read-only or writable, it has an associated help text (that is printed on mysqld –help –verbose), certain variables only accept […]

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MariaDB 10.1.1: Defragmenting unused space on InnoDB tablespace

Introduction When you e.g. delete rows, these rows are just marked as deleted not really physically deleted from indexes and free space introduced is not returned to operating system for later reuse. Purge thread will physically delete index keys and rows, but still free space introduced is not returned to operating system and this operation […]

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