Here’s a rundown of Thursday (day 3) of the MySQL Conference and Expo. This day’s sessions were much more interesting to me than Wednesday’s, and in fact I wanted to go to several of them in a single time slot a couple of times.

Inside the PBXT Storage Engine

This session was, as it sounds, a look at the internals of PBXT, a transactional storage engine for MySQL that has some interesting design techniques. I had been looking forward to this session for a while, and Paul McCullagh’s nice explanations with clear diagrams were a welcome aid to understanding how PBXT works. Unlike some of the other storage engines, PBXT is being developed in full daylight, with an emphasis on community involvement and input. (Indeed, I may be contributing to it myself, in order to make its monitoring and tuning capabilities second to none).

PBXT has not only a unique design, but a …

Yesterday, Oracle‘s Ken Jacobs and Heikki Tuuri, creator of InnoDB, have announced the immediate release of InnoDB Plugin 1.0 for MySQL 5.1. I’ve already downloaded it and played around with it a bit. I haven’t had time to do any performance benchmarks or similar just yet. Those will come in due time.

This release is the beginning of two exciting things: InnoDB is now officially decoupled from MySQL release-wise, and lots of new features have been added to this new release. I will come to what the decoupling means in a moment, but first, the major new features in this release of InnoDB (from my …

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As per MySQL documentation, this pool is used to store data …

Today is the first day at the conference (aside from the tutorials, which were yesterday). Here’s what I went to:

New Subquery Optimizations in 6.0

By Sergey Petrunia. This was a similar session to one I went to last year. MySQL has a few cases where subqueries are badly optimized, and this session went into the details of how this is being addressed in MySQL 6.0. There are several new optimization techniques for all types of subqueries, such as inside-out subqueries, materialization, and converting to joins. The optimizations apply to scalar subqueries and subqueries in the FROM clause. Performance results are very good, depending on which data you choose to illustrate. The overall point is that the worst-case subquery nastiness should be resolved. I’m speaking of WHERE NOT IN(SELECT…) and friends. It remains to be seen how this shakes out as 6.0 matures, and what edge cases will pop up.

The Lost Art Of the Self …

Here is the notes from “InnoDB status, architecture and new features” by Heikki Tuuri and Ken Jocobs.

• Introduction
  • Announced Plugin 1.0 for MySQL 5.1
  • fast, reliable, proven
  • fast
    • row-level locking, MVCC -> high concurrency & throughput
    • high performance CPU, memory and I/O architecture
    • efficient indexing (covering)
  • reliable
    • automatic crash recovery
    • integrated referencial integrity and transactions
    • online backup
    • well written, well tested and large user community
  …

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The solidDB for MySQL database engine for MySQL may have lost its sponsor following IBM’s acquisition of Solid Info Tech but events at this week’s MySQL Conference and Expo prove the certified engines program is alive and well.

Not only has Oracle announced that its Innobase subsidiary has updated InnoDB transactional storage engine, but there is also a new member of the certified engines program.

Kickfire has recently …

Even though I didn’t go to MySQL conf this year (really sad about this), this week is gonna be most active in the community so I decided to do some community stuff too Today I’ve released version 0.3 of our innodb recovery toolkit. Now it became much faster, stable and accurate. At this moment it is possible to recover almost any table from corrupted/deleted tablespace without so much effort as it was before. Here is a short changes list (since 0.1 announced here):

• More MySQL data types added: DECIMAL (both old and new), DATE, TIME
• CHAR data type handling improved in table definitions generator
• Indexes filtering added to page_parser
• 64-bit stat() support added to all tools
• Linux has no isnumber() function so we define our own …

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According to the official documentation, this variable defines "The number of logical reads that InnoDB could not satisfy from the buffer pool …

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