Tech4Him - Technology with Integrity » mysql

MySQLCheck For Quick Repair

Tom — Mon, 15 Feb 2010 13:49:29 +0000

Thanks to this tip on the Taragana blog, I was introduced to the mysqlcheck command. In a pinch, the following command will check, repair and optimize all tables in all databases on your MySQL server instance.

mysqlcheck -u root -p --auto-repair --check --optimize --all-databases

mysqlcheck is available in MySQL 3.23.38 and later.

The official documentation for mysqlcheck says: “The mysqlcheck client performs table maintenance: It checks, repairs, optimizes, or analyzes tables.” Now, this must be run on a MySQL instance that is currently running, unlike the myisamchk tool. So, you may want to stop all access to your instance. If you are using it for websites, perhaps kill HTTPD for a few minutes some other means.

MySQL Stopped Starting Upon Reboot – Ubuntu

Tom — Wed, 23 Sep 2009 03:31:22 +0000

Okay, so here is a quick tip. After making some system changes on an Ubuntu 8.04 LTS box with MySQL 5, a problem occurred. Upon starting the system up, MySQL failed to automatically start as it had been doing.

The tip is to reset all the system startup scripts for MySQL run the following commands:

sudo update-rc.d -f mysql remove
sudo update-rc.d mysql defaults

After that, reboot and if the problem was in those system startup scripts, I bet your problem is resolved.

Blessings.

Don’t leave your MySQL hanging (check your my.cnf)

Tom — Thu, 20 Aug 2009 00:14:52 +0000

Admit it! Have you ever made a change to your my.cnf file, restarted mysqld only to have the restart fail because of an error in the configuration file? Come on, you don’t have to hide anything here.

Well, I found my new best friend when performance tuning mysql. Thanks to this simple post, we can now check the syntax of out “tweaked” my.cnf file BEFORE restarting mysqld.

Yup. All your mysql experts are saying, “Duh!”. Well, for me this was well worth the 15 seconds to find with Google.

Use the mysqld shell command with the –help and –verbose flags. If there is an error in your my.cnf file, it will tell you as in the example below. For those who don’t want to learn more, if your my.cnf is syntactically correct, you will get the long config settings list displayed.

# /usr/libexec/mysqld --help --verbose
081009 9:55:36 [ERROR] /usr/libexec/mysqld: unknown variable 'mmax_connections=150'

Once your done, you can quickly restart mysqld. Hopefully, nobody even notices. )

Web Roundup – 2/18/2009

admin — Fri, 20 Feb 2009 01:45:34 +0000

Here are a few interesting links and articles from around the web.

12 Standard Screen Patterns – An interesting article from DesigningWebInterfaces.com. These patterns are specifically discussed in relation to the adoption of RIA platforms.

How To Get 1,645 Free Prints – I won’t even pretend to call this an article but it is a quick set of links to photo print online services that offer free prints to new customers. Read each services fine print for the free prints but hey, you can get some free prints without using your ink.

Google’s Next-Gen of Sneakernet – Old is new again. Even with all of the significant progress and exponential growth of computing power, network bandwidth, et al. The best way to deliver such significantly large amounts of data is via SneakerNet, er FedExNet.

Ebooks search engine – Interesting site where your search results are PDF documents only. Did find quite a few duplicates in my test search results, but also found some interesting Drupal PDF docs.

MySQL Cheat Sheets – Thumbnailed list of links to MySQL Cheat sheets.

Until next time, grace and peace to you.

How will Sun Make Up the Price for Acquiring MySQL

admin — Fri, 25 Jan 2008 17:53:56 +0000

I am sure you have heard the news by now. Yup, Mysql was acquired by Sun. Can someone say $1 billion? Wow. Sounds like an NPV, is it wise? Well, the open source community seems to be mostly "for" the acquisition and some business analyst seem to be leaning toward "what are they thinking".

Jeff Gould has an interesting take on what this all might look like. He might be right on target.

Oh yeah, you can hear the spin directly from Jonathan and his writers in a few places.

Here
and here

I guess the rest of will just have to wait to find out exactly what all of this will mean for our web centric development. You know, I winder if this acquisition has anything to do with the four (4) calls in six(6) months that I’ve gotten from MySQL about how we use the product.

The last email I received from a sales person included:

"…I would still like to find
out how you are using our software. Many clients using our software in
an enterprise environment take advantage of our MySQL Enterprise offering. MySQL Enterprise includes the most comprehensive offering of MySQL
database software, services and production support to ensure your
business achieves the highest levels of reliability, security and
uptime. Depending on your MySQL usage you may also be in need of licensing."

Hmmmm….makes you think a bit but certainly we will continue using MySQL where it makes sense for the forseeable future.