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Displaying posts with tag: Internals (reset)

Performance Impact of InnoDB Transaction Isolation Modes in MySQL 5.7
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During the process of reviewing our server defaults for MySQL 5.7, we thought that it might be better to change the default transaction isolation level from REPEATABLE-READ to READ-COMMITTED (the default for PostgreSQL, Oracle, and SQL Server). After some benchmarking, however, it seems that we should stick with REPEATABLE-READ as the default for now.

It’s very easy to …

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Extent Descriptor Page of InnoDB
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Within the MySQL data directory, the InnoDB storage engine creates two types of files — the data files and the redo log files. Each data file (or ibd file) belongs to exactly one tablespace. Each tablespace is given a unique identifier called the space_id. One tablespace can have 1 or more data files. If a tablespace has more than one data file, then the data files have a specific order or sequence. The data files can be thought of as being concatenated to each other in that specific order.

The data file is made up of a …

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Using the row buffer in Drizzle (and MySQL)
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Here’s another bit of the API you may need to use in your storage engine (it also seems to be a rather unknown. I believe the only place where this has really been documented is ha_ndbcluster.cc, so here goes….

Drizzle (through inheritance from MySQL) has its own (in memory) row format (it could be said that it has several, but we’ll ignore that for the moment for sanity). This is used inside the server for a number of things. When writing a Storage Engine all you really need to know is that you’re expected to write these into your …

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Building MySQL Server with CMake on Linux/Unix
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CMake is a cross-platform, open-source build system, maintained by Kitware, Inc.

From the CMake.org home page:

CMake is a family of tools designed to build, test and package software. CMake is used to control the software compilation process using simple platform and compiler independent configuration files. CMake generates native makefiles and workspaces that can be used in the compiler environment of your choice.

It has been used for …

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2010 will be a good year,
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I suppose I should make it official: 2010 should see me being much more active in the Community.Why? Simply because I am now working for Blizzard Entertainment where I hope to help them make better, more efficient, use of MySQL/MariaDB. I expect to be working on some of MySQL's internals and storage engines in order to achieve what is wanted and helping them enhance their existing use of

A year in review; new direction.
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It has been more than a year since my self-imposed hiatus from serious MySQL development started and I think it is about time that I get back into the saddle. I have a handful of working prototypes but I should get the code out there, back into the community.I learned a bunch of stuff during the past year at Google but in the end, working on JavaScript, HTML/CSS and Google proprietary languages

MySQL Error of the day
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Just spotted the following posting from Paul DuBois on the internals mailing list:

I'm engaged in a project (WL#3403) to compile information that will provide better information about our errors and error messages:

  • What an error means
  • Likely causes of the error
  • How to rectify or work around the error

The general idea is to …

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Perl and Java Stored Procedures for MariaDB 5.1
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I just applied the external stored procedure patch to a branch of MariaDB and uploaded it to LaunchPad.You can see the branch at https://code.launchpad.net/~atcurtis/maria/5.1-wl820Note that this is not in any reasonable condition to merge into MariaDB. Hopefully we can engage in dialog as to how we can bring this feature properly to MariaDB, MySQL and Drizzle, hopefully making the plugins

InnoDB Conference Presentations Now Online
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Well, it took us a little while (we’ve been busy !), but we’ve now posted our presentations on InnoDB from the MySQL Conference and Expo 2009. You can download these presentations by Heikki Tuuri, Ken Jacobs and Calvin Sun from the InnoDB website, as follows:

  • Ken and Heikki: …
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Perl Stored Procedures for MySQL
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Files used in conference presentation here: UC2009 presentationI think todays presentation for Perl Stored Procedures for MySQL was quite successful. The audience was quite engaged and asked questions throughout (yes, I invited questions through the talk). I made sure to mention Eric Herman's Java plugin because even though he didn't get time to submit a talk, the work is noteworthy. Sometimes I

Showing entries 1 to 10 of 20 10 Older Entries

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