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Displaying posts with tag: MySQL Documentation (reset)

Tracking Server Variables, Documentation, Manuals, Changelogs for MySQL, InnoDB, MariaDB, and XtraDB
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I find myself constantly looking up server variables (and manuals and changelogs) for MySQL, MariaDB, and XtraDB, which versions they are in, and so forth. So I finally created a couple pages which contain the links to all of these various bits of information across the various flavors of MySQL.

I’ve been using them every day, so I thought some others might want to bookmark these as well.

I’ve created the following:

o Changelogs
o Documentation
o Server Variables
o InnoDB Plugin Versions

The Changelogs page contains links for MySQL 3.23 up through 5.6, MariaDB 5.1 – 5.3, XtraDB 5.1 – 5.5, Xtrabackup 1.3 – 1.6,




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No Silver Bullet
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Giuseppe Maxia’s new article at the MySQL DevZone rightly points out that using partitions doesn’t work by magic; as with any other enhancement, it requires a bit of know-how to realise its value. MySQL 5.1 Partitions in Practice reviews some of the basics and points out a few gotchas (if you want to partition on a DATE or DATETIME column, pay close attention here). He then provides some realistic examples showing how you actually get partition pruning working for your queries and backs it up with some interesting performance figures.

On a related note, I recently reorganised the MySQL Manual’s discussion of

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ISBN 978-1-8479-9168-3
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A little over a year since the project to write this book began, the MySQL 5.1 Cluster Certification Study Guide is now at long last available. It covers everything you’ll need to know to pass the Certified MySQL Cluster 5.1 Database Administrator exam (http://www.mysql.com/certification/), including MySQL Cluster Concepts, Architecture, Configuration, Deployment, NDB Internals basics, High Availability techniques, Security Issues, and more.

(It does not cover MySQL Cluster 5.1 Carrier Grade Edition, for the simple reason that MCCGE features are not part of the official mainline MySQL 5.1 release. However, those features will be part of MySQL 6.0 [yes, MySQL 6.0 is already starting to happen, and there are already some cool new

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Partitioning Optimizations
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We’ve been getting lots of questions about how MySQL 5.1 optimises queries on partitioned tables. Recently, we added some new information about this to our Internals Manual provided by one of our developers, Sergey Petrunia. (I hope that my edits and formatting haven’t messed up anything — if there are any problems with what’s been published in the Internals Manual, then the fault’s probably mine and not his.)

The new section can be accessed here, and includes coverage of the following topics:

  • An overview of how MySQL performs partition pruning
  • What partitioning and subpartitioning intervals are, and why they’re important
  • Converting WHERE and ON clauses into intervals
  • Partition
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NDB API Examples Updated and Expanded
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Recently, MySQL Cluster developer and team leader Martin Sköld committed some major revisions and additions in the storage/ndb/ndbapi-examples directory of the MySQL 5.1 source. Although I don’t think these have yet been pushed out to the public 5.1 tree, I went ahead late last week and added them to the Practical Examples section of the NDB API Guide so that interested parties can take advantage of a number of corrections and other improvelements that Martin’s made.

There’s two new additions, also — here and here — these demonstrate for the first time in the Guide

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Cluster Utilities Revealed
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Ever wonder what all those binaries with names starting in “ndb” were doing in mysql/bin? Not surprisingly, they’re MySQL Cluster monitoring, utility, and demonstration programs, and after a couple of fun-filled weeks of experimenting with them (and asking a few of the usual sorts of silly questions I’m know for asking in the right quarters) I’ve been able to document most of them in a new Cluster Utility Programs section of the MySQL Manual (I’ve linked to the 5.1 version, but they’re available in 4.1 and 5.0, too).

If you’ve not looked at these before, check them out. A couple of them — like ndb_waiter and ndb_desc — are handy for monitoring a MySQL Cluster or

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Something?s Fishy with the MySQL Documentation?
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If you’re interested in looking at what goes into the MySQL documentation, there’s a new and kind of cool gizmo we’ve just installed that makes browsing the docs sources a breeze. Fisheye lets you browse by project, directory, author, date, and other criteria. It also provides an easy way to get to the complete changelogs, and even provides a customisable changelog RSS feed — for example, this feed has commits for just the NDB API documentation, and this is a feed of (all) my commits to the

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The Truth About Keys and Partitioning
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I recently discovered that I’d made a huge blunder in the Partitioning Limitations section of the MySQL 5.1 Manual. I’d had the idea that unique keys don’t effect your choice of partitioning columns unless there’s no primary key.

My latest revision of the documentation for this limitation isn’t much better.

Then, as I was sitting here just now trying to persuade my daughter that she really ought to have something for lunch besides marshmallows, it came to me.

It’s very simple, really.

For any user-partitioned table in MySQL 5.1:

  • If a table has any unique keys, then all columns used in the partitioning expression must also be part of any and all of these keys.
  • By definition, a primary key
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    API vs SQL, DB vs Data
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    I did a bunch of housekeeping in the MySQL Cluster documentation today.

    Confession: I’m the bright light who came up with the term “SQL node” because I didn’t like “API node”. At the time, it seemed like a good idea, but as time has gone on, I’ve come to see the error of my ways. However, lots of people now use the term, so I guess it’s not a good idea to change it out from under them. So here’s what I’ve decided:

    API node - Any application that accesses Cluster data. Basically this means any NDB API application.

    SQL node - A subspecies of API node that provides an SQL interface to a Cluster. Basically, this means a MySQL Server that’s part of a Cluster. (mysqld itself isn’t an NDB API application, but the bits that let it talk to a

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    Showing entries 1 to 9

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