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10 Newer Entries Showing entries 31 to 40 of 42 2 Older Entries

Displaying posts with tag: MySQL 5.5 (reset)

IDC Insight Report: "MySQL Thrives"
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In its "Insight" Research Report from October 2010 "Messages from Oracle OpenWorld 2010: Exadata Exceeds Expectation and MySQL Thrives", IDC Carl W. Olofson notes:


"Last but not least, Oracle announced the MySQL 5.5 release candidate, which solidifies the commitment the company has made to continuing the development and the independence of MySQL as an open source relational DBMS. This announcement came along with continued assurances that MySQL is and will remain autonomous. Nonetheless, useful MySQL intellectual property may find its way into other Oracle products, and Oracle's database development engineers will almost certainly lend their expertise to helping make MySQL better...


...MySQL users should take heart from the 5.5 release candidate and the ongoing

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Mark Callaghan over at Facebook wrote a note recently about InnoDB disk IO counters in SHOW STATUS, with some extra things that he wanted to track. I posted a quick comment over there, but I thought this deserved it’s own write up.

MySQL 5.5’s PERFORMANCE_SCHEMA has had a fair bit written about it in terms of tracking synchronization point contention (mutexes etc.), but it currently tracks two orders within the wait class - these are /wait/synch and /wait/io.

Actually, allow me to detour first, it’s not clear from the documentation, though it is clear in the worklog. Each

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Discover What's New in MySQL 5.5 Replication
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UPDATE: An on-demand replay for the webinar discussed below is available here:

And there is a new whitepaper for MySQL Replication posted here:

The recent announcement of the MySQL 5.5 Release Candidate included some pretty staggering increases in performance and scalability. 

Replication is also an area where many enhancements have been made including semi-synchronous replication, replication heartbeating, fsync tuning, relay log recovery, per-server replication filtering, etc.

On Tuesday 12th October, Dr. Lars Thalmann

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Found a nasty COALESCE() related bug in 5.5.6-rc
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Seeing as it looks like 5.5 is shortly about to go GA I thought I’d give it a run and see how well it works. The only way really to test it is to give it a bit of load and look for things which break. That I did with the 5.5.6-rc community rpms, compared to the 5.1 advanced rpms I usually run.

My colleagues, Ben and Peter, found a horrible problem which means that I can’t use this even for any real usage on my real servers. See: bug#57095 for all the gory details. Thanks to them both for finding the problem and then digging down and figuring out the real cause. Sometimes developers work a long way from the database so their errors don’t translate into something I can really look at in the database. They delved into the problem and then found the cause and a nice easy test

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Tracking mutex locks in a process list, MySQL 5.5’s PERFORMANCE_SCHEMA
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Internally MySQL uses various methods to manage (or, block) concurrent access to shared structures within the server - the most common being mutexes (or Mutual Exclusion locks), RW Locks, or Semaphores. Each have slightly different properties on how different threads are allowed to interact when trying to access these synchronization points.

There has been much written on the various hot spots in the server around these locking/blocking constructs over the past couple of years, so I won’t go further in to that here. See the excellent blogs from Mikael or Dimitri from within Oracle, or those from the likes of

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Oracle Announces MySQL 5.5 Release Candidate
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Yesterday, Sept. 19, 2010 at the inaugural MySQL Sunday event at Oracle OpenWorld, we announced the MySQL 5.5 Release Candidate. The MySQL 5.5 release candidate helps improve the performance and scalability of applications across multiple operating environments, including Windows, Linux, and Mac. Enhancements include:

Improved performance and scalability:
  • MySQL Server and InnoDB have been enhanced to provide optimum performance and scalability when running on the latest multi-CPU and multi-core hardware and operating systems.
  • InnoDB is now the default storage engine for MySQL Server, delivering ACID transactions, referential integrity, and crash recovery.

Higher availability:

  • New
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High Availability & Clustering at MySQL Sunday
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UPDATE: New room assignments for the MySQL Cluster and Replication Enhancements sessions

With the MySQL Sunday event at Oracle Open World rapidly approaching, and registrations to the event 10x higher than originally forecast, I thought it would be a good time to highlight sessions that are specifically addressing MySQL high availability, including MySQL Cluster ( .

You can see details and logistics of all of the sessions here

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MySQL 5.5 Performance Gains
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Oracle managed to score a major victory last week at the MySQL Conference by announcing performance gains of 200-360% in the forthcoming version 5.5.  This is a tremendous improvement and comes in part due to closer collaboration between what were historically two distinct (and occasionally competitive) groups: the InnoBase team and the MySQL Server team.  Bringing the InnoBase team under the direction of the MySQL Server team under Tomas Ullin is a great benefit not only to MySQL developers, but also for MySQL users.  No doubt these performance gains are a result of many months of hard work by not only Tomas, but also a good number of folks on both teams including guys like Mikael Ronstrum, Kojstja, Calvin Sun and others.  

Reaction to the new release has been positive

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Restoring XML-formatted MySQL dumps
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EAVB_VFZUHIARHI To whom it may concern -

The mysqldump program can be used to make logical database backups. Although the vast majority of people use it to create SQL dumps, it is possible to dump both schema structure and data in XML format. There are a few bugs (#52792, #52793) in this feature, but these are not the topic of this post.

XML output from mysqldump

Dumping in XML format is done with the --xml or -X option. In addition, you should use the

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MySQL 5.5 – A Community Winner
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Ever since MySQL 5.5 beta has been announced by Edward Screven, Oracle’s chief corporate architect; there is lot of positive buzz (here, here, …) about the performance and scalability improvements added in this release. We should all be thankful to Michael Ronstrom (as most of the key developers are already working on different forks), who [...]
10 Newer Entries Showing entries 31 to 40 of 42 2 Older Entries

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