Introduction

Fortran (FORmula TRANslating System) is a general-purpose, imperative programming language that is especially suited to numeric computation and scientific computing. History of FORTRAN can be tracked late 1953 when John W. Backus submitted a proposal to his superiors at IBM. The First FORTRAN compiler appeared in April 1957.

Some notable historical steps where:

FORTRAN II in 1958
FORTRAN III in 1958,
FORTRAN IV in 1962.
FORTRAN 66 or X3.9-1966 become the first industry-standard
FORTRAN 77 or X3.9-1978. This is the version of the Fortran I learned 1996.

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Last week, a SSL connection security vulnerability was reported for MySQL and MariaDB. The vulnerability states that since MariaDB and MySQL do not enforce SSL when SSL support is enabled, it’s possible to launch Man In The Middle attacks (MITM). MITM attacks can capture the secure connection and turn it into an insecure one, revealing data going back and forth to the server.

Issue resolution in MariaDB is visible through the corresponding ticket in MariaDB’s tracking system (JIRA): https://mariadb.atlassian.net/browse/MDEV-7937

The vulnerability affects the client library of the database server in both MariaDB and MySQL. But, the vulnerability does not affect all the libraries, drivers or connectors for establishing SSL connections with the server. …

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About two and a half years ago I wrote about how the MariaDB project moved bug reporting from Launchpad to JIRA. Every now and then I get contacted about how it was done and whether I would be willing to share the tools used for doing it and of course I’ve done that. Especially in one occasion the scripts were even further developed by one company that was in the process of doing exactly the same, i.e. moving bugs from Launchpad to JIRA. Thanks for the enhancements Philip Colmer from Linaro!

In Launchpad there isn’t a readymade tool for exporting bugs and I didn’t find any 3rd party tools for doing it. …

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It’s been almost a year since I benchmarked MariaDB and MySQL on our good old 4 CPU / 32 Cores / 64 Threads Sandy Bridge server. There seem to be a few interesting things happened since that time.

MySQL 5.6.23 peak throughput dropped by ~8% compared to 5.6.14. Looks like this regression appeared in MySQL 5.6.21.
10.0.18 (git snapshot) peak threads increased by ~20% compared to 10.0.9 and reached parity with 5.6.23 (not with 5.6.20 though).
10.1.4 (git snapshot) and 5.7.5 are the champions (though 10.1.4 was usually 1-5% faster). Both have similar peaks @ 64 threads.

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Continue reading “A few interesting findings on MariaDB and MySQL scalability, multi-table OLTP RO”

Note that this post is now outdated. See Table and tablespace encryption on MariaDB 10.1

Introduction

For the moment, the only engines that fully support encryption are XtraDB and InnoDB. The Aria storage engine also supports encryption, but only for temporary tables.

MariaDB supports 2 different way to encrypt data in InnoDB/XtraDB:

Specified table encryption: Only tables which you create with PAGE_ENCRYPTION=1 are encrypted. This feature was created by eperi.
Tablespace encryption: Everything is encrypted (including log files). This feature was created by Google and is based on their MySQL branch.

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Continue reading “Table and tablespace encryption on MariaDB 10.1.3”

Introduction

Causal consistency [1] is one of the consistency criteria that can be used on distributed databases as consistency criteria.

Distributed database provides causal consistency if read and write operations that are causally related are seen by every node of the distributed system in the same order. Concurrent writes may be seen in different order in diffrent nodes. Causal consistency is waker than sequential consistency [2] but stronger than eventual consistency [3]. See earlier blog for more detailed description on eventual consistency https://blog.mariadb.org/eventually-consistent-databases-state-of-the-art/.

When a transaction performs a read operation followed later by a write operation, even on different object, the first read is said to be causally ordered before the write. …

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On February 26th 2015 the first meeting of Germany’s Rhein/Neckar User group will take place in Heidelberg.

Georg Richter, lead of MariaDB’s connectors team will give a talk “Don’t! No! Never!- common mistakes in relational database systems”.

Two special guests (Sanja Byelin, MariaDB Server Core Developer and Lawrin Novitsky, lead developer of MariaDB’s Connector/ODBC) will be available too for answering your questions and discussing/collecting your ideas around MariaDB, Percona, MySQL related and other database management systems.

Celebrate free speech, but also free beer (sponsored by MariaDB Corporation) and join on us on Feb. 26th in Heidelberg! …

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