Happy Thanksgiving and little holiday challenge for you.
Say you have a trigger on the slave which you would like to work differently, depending on whenever update is executed via replication thread vs updating table locally ? This can be helpful for example for auditing updates which were done directly instead of coming from the master and some other cases.
Suggest how you would do it by commenting

Entry posted by peter | 12 comments

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Sometimes I amaze myself in my capacity to make assumptions about how things should work, especially when it comes to test plans... ( You know what happens when we assume, right? )I had this great idea to setup a couple slaves off a master-master replication set something like this:MASTER A <--------------> MASTER B | | | | |

MySQL 6.0.8 has new interfaces for semisynchronous replication.

The interfaces make it possible to load components to ensure that all transactions are replicated to the slave before the users of the master gets acceptance of the commits.

The original code was developed by Mark Callaghan (Google) and Wei Li (Google). Zhenxing He (MySQL) ported the Google code to MySQL 6.0, extracted the functionality into pluggable components, and changed the code so that all storage engines are supported. Paul DuBois (MySQL) wrote the MySQL manual documentation.

The extraction of this patch into components is a first step in our strategy to make MySQL Replication modularized with separate loadable components for special replication functionality. With more interfaces to the server, it becomes easier to make the server behave in …

Pluggable open source replication has arrived, at least in beta form. Today we are releasing Tungsten Replicator 1.0 Beta-1 with support for MySQL. This release is the next step in bringing advanced data replication capabilities to open source and has many improvements and bug fixes. It also (finally) has complete documentation. I would like to focus on an interesting feature that is fully developed in this build: pluggable replication.

I have blogged about our goals for Tungsten Replicator quite a bit, for instance here and …

I just finished reading the recently released 2nd Edition of High Performance MySQL by Baron Schwartz, Peter Zaitsev, Vadim Tkachenko, Jeremy Zawodny, Arjen Lentz & Derek Balling.  I’ve posted a review here on Amazon.

Wow, that’s quite a list of authors, but when you look at the material, you see why.  This book is a very indepth look at the MySQL server.  Intended for the intermediate to advanced DBAs and developers who want to know the inner workings of the server, as well as how to use many of it’s advanced features.

For instance the chapter on replication was quite good.  Given that you probably setup replication in five minutes, and are wondering weeks or months later why it’s not working, this chapter will give you …

• A reader of that article told me that he used information I wrote to set up a circular replication in production, and it is still working!
• A new page on circular replication in MySQL manual was just published.
• During yesterday's meetup in New York, an attendee asked advice about broken replication in a circular scheme, and I suggested reading all the …

If you are a MySQL 5.x/6.0 InnoDB replication user, right now you take a significant performance hit on the replication master simply by turning on the binlog. The good news is that we've taken a big step toward eliminating that performance gap. I'll describe the problem, how I was able to track down the root cause, and point to a patch that fixes the problem. Since the changes are in the InnoDB code, right now we're waiting on Oracle/Innobase to review the fix and formally commit it. Once that happens, you should see it show up in binary releases. In the meantime, if you build your own binaries you can test the prototype patch yourself.

One of the things I have been working on quite a bit over the past several months is scalability of the nodes within a MySQL scale-out replication environment.  The reason being that there has been a rapid …

If you are a MySQL 5.x/6.0 InnoDB replication user, right now you take a significant performance hit on the replication master simply by turning on the binlog. The good news is that we've taken a big step toward eliminating that performance gap. I'll describe the problem, how I was able to track down the root cause, and point to a patch that fixes the problem. Since the changes are in the InnoDB code, right now we're waiting on Oracle/Innobase to review the fix and formally commit it. Once that happens, you should see it show up in binary releases. In the meantime, if you build your own binaries you can test the prototype patch yourself.

One of the things I have been working on quite a bit over the past several months is scalability of the nodes within a MySQL scale-out replication environment.  The reason being that there has been a rapid …

If you are a MySQL 5.x/6.0 InnoDB replication user, right now you take a significant performance hit on the replication master simply by turning on the binlog. The good news is that we've taken a big step toward eliminating that performance gap. I'll describe the problem, how I was able to track down the root cause, and point to a patch that fixes the problem. Since the changes are in the InnoDB code, right now we're waiting on Oracle/Innobase to review the fix and formally commit it. Once that happens, you should see it show up in binary releases. In the meantime, if you build your own binaries you can test the prototype patch yourself.

One of the things I have been working on quite a bit over the past several months is scalability of the nodes within a MySQL scale-out replication environment.  The reason being that there has been a rapid …

Last week I attended an incredibly intense conference in Lalandia, Denmark: Miracle Oracle Open World. According to Mogens Norgaard, the organizer, the conference devotes 80% of the time to intense discussions of Oracle databases and 80% of the time to drinking. During the festivities you get this dim mental image of what it would have been like if Vikings had access to 16-core machines and advanced database software. But I digress.

Anyway, Lalandia is located on just that kind of spare, beautiful coast that clears the mind to look for fundamental truths. And sure enough, a talk by Carel-Jan Engel, nailed one of them: simplicity is the key to availability.

At some level we all …