Author Archives: Anna Widenius
You might have heard the story of how we picked a sea-lion as our logo. Now that this lovely beast has been with us for a while, we think it’s high time to give it a name and of course we turn to our wonderful community for suggestions.
The rules are simple: complete this form, telling us what you think we should name the sea lion and why. Later, Maria Widenius will pick her favorite from the submissions, and the winner will get a collection of MariaDB t-shirts and other swag, an artwork by Maria, and of course eternal fame!
Galera Cluster for MySQL is a 100% synchronized cluster in regards to data modification operations (DML). It is ensured by the optimistic locking model and ability to rollback a transaction, which cannot be applied on all nodes. However, schema changes (DDL operations) are not transactional in MySQL, which adds complexity when you need to perform an upgrade or change schema of the database.
Changes made by DDL may affect results of the queries. Therefore all modifications must replicate on all nodes prior next data access. For operations which run momentarily it can be easily achieved, but schema changes may take hours to apply.
Galera R&D team is currently finalizing new features targeted for the next MariaDB 10.5 release. This presentation is a high level overview of the most prominent Galera clustering features under work, such as:
* Non Blocking DDL – for less turbulence of schema upgrades in a cluster
* Cluster Error Voting – for immediate recovery of node failures
* XA transaction Support – for executing XA transactions in a multi-master cluster
* GTID consistency – for consistent GTIDs in hybrid cluster / replication topologies
* Black Box – cluster hardening through more detailed diagnostics
We continue presenting our MariaDB Day Speakers. Please remember to register for the event at the Meetup page.
Application-time periods is another feature of SQL-2011. It’s main purpose is to introduce a per-table PERIOD entity, which generally is a pair of temporal fields: [period start, period end), and to set up a new set of syntax and constraints.
Note: the standard forbids these fields to be of type TIME, and to have more than one period per table.
The eminent part of application-time periods is a UNIQUE semantic extension — it adds a possibility to specify a period there, with adding WITHOUT OVERLAPS after it.
MySQL 8.0 has introduced roles, a feature that was present since MariaDB 10.0. There are quite a number of differences between the two databases.
During the MariaDB day Vicențiu will present a comparison between them and see how roles are useful for your application and what are the key differences to consider when working with both databases.
For a large Open Source project to survive, it needs the right testing infrastructure in place. Because of this, the MariaDB Foundation made the whole build system a community shared resource. In this talk we will show how we have accomplished this and how the community can benefit.
MariaDB Day is part of FOSDEM Fringe and will be held on Sunday 2 February 2020. Attendance is free, but space is limited, so please RSVP on the Meetup page if you plan to attend.
MariaDB has an Open Source engine called ColumnStore which provides columnar storage capabilities. During the MariaDB Day Andrew Hutchings (a.k.a. LinuxJedi) will hold a talk explaining what columnar storage is, how it works and the advantages / disadvantages of it. He will also talk about how you can use it to help with things such as your analytical workloads alongside your traditional OLTP workloads.
eBPF on Linux 4.9+ is probably the best way to study performance problems. Basic usage of ftrace interface, bcc tools and bpftrace, as well as main bpftrace features and commands are presented. Several typical use cases (including adding dynamic probes to MariaDB servers, working with stack traces and creating Flame Graphs) are discussed.