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Showing entries 1 to 10 of 146 10 Older Entries

Displaying posts with tag: Technical Blog (reset)

fsfreeze in Linux
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The fsfreeze command, is used to suspend and resume access to a file system. This allows consistent snapshots to be taken of the filesystem. fsfreeze supports Ext3/4, ReiserFS, JFS and XFS.

A filesystem can be frozen using following command:

# /sbin/fsfreeze -f /data

Now if you are writing to this filesystem, the process/command will be stuck. For example, following command will be stuck in D (UNINTERUPTEBLE_SLEEP) state:

# echo “testing” > /data/file

Only after the filesystem is unfreezed using the following command, can it continue:

# /sbin/fsfreeze -u /data

As per the fsfreeze main page, “fsfreeze is …

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Licensing Oracle in a public cloud: the CPU calculation impact
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First of all a disclaimer: I don’t work for Oracle nor do I speak for them. I believe this information to be correct, but for licensing questions, Oracle themselves have the final word.

With that out of the way, followers of this blog may have seen some of the results from my testing of actual CPU capacity with public clouds like Amazon Web Services, Microsoft Azure, and …

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Detecting Source of MySQL Queries with Comments
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As a MySQL DBA I already know the data changes that happen on my system. I have logs for that.

However, it’s a common problem that several years into the life of an application, the current developers won’t know where in the codebase queries come from. It’s often hard for them to find the location in the code if queries are formed dynamically; the pattern I show them to optimize doesn’t match anything in the code.

I stumbled on a trick a couple years ago that has been invaluable in tracking down these problematic queries: query comments.

Here’s an example:

When a query generally shows up in a slow query …

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Installing Oracle VM Manager 3.2.x under Dom0 host
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Some of you know that I have published how to install Oracle VM Manager (OVMM) on a Dom0 host since Oracle released the Oracle VM 3. I have described why you possibly may want to do it in my very first post. Just want to mention here that it should be used for sandbox configurations only. You can find the previous post on how to install 3.1.1 OVMM version under Dom0 here. This …

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REMINDER – MySQL Community Dinner at Pedro’s 2013
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Friends,

I want to remind you to let us know if you would like to come for the dinner at Pedro’s on Tuesday April, 23.

Actually, ALL of you should come!

Pedro’s is asking us to have a better idea of the number of participants, so please go to this page “MySQL Community Dinner at Pedro’s 2013” and subscribe.

We want to have all of you enjoy the evening with us. Subscribe & come!

MySQL Community Dinner at Pedro’s 2013
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Once again, Pythian is organizing an event that by now may be considered a tradition: the MySQL community dinner at Pedro’s! This dinner is open to all MySQL community members as many of you will be in town for the MySQL Conference that week.

Here are the details:

What: The MySQL community pay-your-own-way dinner
When: Tuesday April, 23 – Meet us at 6:30 pm in the lobby of the Hyatt Santa Clara, or at 7 pm at Pedro’s (You are welcome to show up later too!)
Where:  …

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About MySQL 5.6
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I am very excited and thrilled to use the latest release of MySQL 5.6 in production. This is probably the most notable and innovative release in many years, if not ever.

During the last year, we had the chance to work with many new features and test the fixes to old issues. To be honest, I was expecting to have MySQL 5.6 GA before now, and I even wagered with my colleague Francisco that it would be out before the end of 2012. It was nothing special, just a beer in the Santa Clara Hyatt lounge. Unfortunately for me, MySQL 5.6 is now in GA and given that it happened in 2013, I lost the bet and now have to pay for that beer. But I have also lost the full …

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Quiet Release MySQL Plugin 12.1.0.1.2 — Bug Fixes
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This is just a small bug-fix release of the plugin. It has actually been quietly released for a while now. If you have downloaded the plugin recently, you have the latest version. To be sure, check the version in the Console, or you can see it in the file name.

There are two bugs fixed:
1. Deployment on an OMS hosted on Solaris didn’t work. (And I suspect it could be the same for Agents on Solaris.)
2. Changing thresholds on the metrics caused the error “Modification of Target Monitoring Settings has Failed”. Also, applying monitoring template was failing for the same reason.


If you didn’t know that you could setup …



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MySQL Oracle Connect 2012: Day Two
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Another good day today: I attended the keynotes and found them quite interesting.

I especially liked the way Twitter uses MySQL to build up a NoSQL solution. Jokes aside, I took a few notes on things I must analyze and dig in.

The introduction of the Paypal models seemed very interesting, which brought me to attend the presentation later on. It was well constructed and had some good theoretical work, but I was quite disappointed. I found the presentation incomplete and missing real numbers for the MySQL Cluster NDB setup.

I attended the presentation done by Ronald B. It was good — nothing really advanced, but it was on purpose. He was very informative and …

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MySQL Oracle Connect 2012: Day One
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I attend five sessions today, and I think that some of them were very interesting, like the one on the Optimizer insight. It was quite informative and accurate.

Another one, done by the MySQL Cluster (NDB) group on the installer and new Javascript API interface, left me a little bit…foggy. Why? Because in my mind, one of the most important things to accomplish in NDB is the correct dimensioning of the memory, buffers, possible operation, attributes, and so on. All these things should come from the schema definition review and from the application analysis.

Now given the review analysis of the schema is still not present in the installer, I …

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Showing entries 1 to 10 of 146 10 Older Entries

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