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10 Newer Entries Showing entries 61 to 70 of 187 10 Older Entries

Displaying posts with tag: code (reset)

Is your Storage Engine buggy or the database server?
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If your storage engine returns an error from rnd_init (or doStartTableScan as it’s named in Drizzle) and does not save this error and return it in any subsequent calls to rnd_next, your engine is buggy. Namely it is buggy in that a) an error may not be reported back to the user and b) everything may explode horribly when rnd_next is called after rnd_init returned an error.

Unless it is running on MariaDB 5.2 or (soon, when the patch hits the tree) Drizzle.

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HandlerSocket plugin – NoSQL/SQL interactions
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HandlerSocket is cool. But, it turns out there are a few issues.

Justin Swanhart points out HandlerSocket currently lacks atomic operations . Since HandlerSocket uses different connections for reading and writing, you can’t increment/decrement a value without creating a race condition.

Still, the idea of skipping SQL interpretation and just reading the data you know you want is a great one.  Writing data might even be better. But being able to use both SQL and NoSQL could be really wonderful.  What if we …

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Using HandlerSocket Plugin for MySQL with PHP
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This document was updated and tested for CentOS 6.0

In my last two posts I installed the HandlerSocket plugin into MariaDB and showed how to use it with Perl.  That’s good, but if you are thinking of using HandlerSocket  I’m guessing you have a very high traffic website and it’s written in PHP.  In this post I’m going to connect HandlerSocket with PHP.  In the next post I’ll discuss using HandlerSocket on a production system.

There are a couple of HandlerSocket php modules projects.  I tried each of them and I found PHP-HandlerSocket was the best.  Both …

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MySQL 5.5 is GA and 5.5.8 missing from launchpad…
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While it’s great that MySQL 5.5 is GA with the 5.5.8 release (you can download it here), I’m rather disappointed that the bzr repositories on launchpad aren’t being kept up to date. At time of writing, it looked like this:

Yep – nothing for five weeks in the 5.5 repo – nothing since the 5.5.7 release :(

There hasn’t been zero changes either – the changelog has a decent number of fixes.

Innobase 1.1.3 in Drizzle
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In case you haven’t heard yet, I’ve merged in the latest InnoDB from MySQL 5.5.7 into Drizzle. The innobase plugin is now based on InnoDB 1.1.3.

This gets a lot of bug fixes and improvements from 1.1.2 (and on 1.1.1). Enjoy!

Using LOAD DATA INFILE with Stored Procedure Workaround-MySQL
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Okay! So here we will use Load Data syntax to load file into MySQL Server in a Stored procedure. Yep! It’s a workaround. Download MySQL UDF: [root@localhost kedar]# wget http://www.mysqludf.org/lib_mysqludf_sys/lib_mysqludf_sys_0.0.3.tar.gz [refer: http://www.mysqludf.org/] Extract and Install: [root@localhost kedar]# tar -xzvf lib_mysqludf_sys_0.0.3.tar.gz install.sh lib_mysqludf_sys.c lib_mysqludf_sys.html lib_mysqludf_sys.so lib_mysqludf_sys.sql Makefile [root@localhost kedar]# sh install.sh Compiling the MySQL UDF gcc […]

Limiting functions to 32k stack in Drizzle (and scoped_ptr)
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I wonder if this comes under “Code Style” or not…

Anyway, Monty and I finished getting Drizzle ready for adding “-Wframe-larger-than=32768″ as a standard compiler flag. This means that no function within the Drizzle source tree can use greater than 32kb stack – it’s a compiler warning – and with -Werror, it means that it’s a build error.

GCC is not perfect at detecting stack usage, but it’s pretty good.

Why have we done this?

Well, there is a little bit of recursion …

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Cursor states
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Following on from my post yesterday on the various states of a Storage Engine, I said I’d have a go with the Cursor object too. A Cursor is used by the Drizzle kernel to get and set data in a table. There can be more than one cursor open at once, and more than one per thread. If your engine cannot cope with this, it is its responsibility to figure it out and return the appropriate errors.

Let’s look at a really simple operation, inserting a couple of rows and then reading them back via a full table scan.

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Storage Engine API state graph
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Drizzle still has a number of quirks inherited from the MySQL Storage Engine API (e.g. BLOBs, row buffer, CREATE SELECT and lack of DDL transaction boundaries, key tuple format). One of …

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HailDB being built by default in Drizzle
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It just it trunk – if you have HailDB installed when you build Drizzle, you will now get the HailDB plugin built. You can even run Drizzle with it (remove innobase plugin, load HailDB plugin). Previously, we had problems building both due to symbol conflicts between innobase and HailDB. We’ve fixed this thanks to the linker.

So, enjoy HailDB… welll, test it and report bugs that I can fix :)

10 Newer Entries Showing entries 61 to 70 of 187 10 Older Entries

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