Posts tagged mysql
Fun with Bash :: one liners
Here are some quick and easy bash commands to solve every day problems I run into. Comment and leave some of your own if you like. I might update this post with new ones over time. These are just some common ones.
Iterate through directory listing and remove the file extension from each file
ls -1 | while read each; do new=`echo $each |se [...]
SAN vs Local-disk :: innodb_flush_met...
If you’ve been tuning your MySQL database and have wondered what effect the innodb_flush_method settings have on write performance, then this information might help. I’ve recently been doing a lot of baseline load tests to show performance differences between localdisk and the new SAN we’re deploying. Since we run InnoDB f [...]
Quick How-To for DRBD + MySQL + LVS
I wrote this up a while ago and decided that I didn’t want to lose it in a shuffle of documents during my transition to a new workstation. It’s the basics of setting up Heartbeat (LVS) + DRBD (block replication between active/passive master servers) + MySQL. This should give you the basics of a H/A system without the benefits of [...]
Quadrant Framework – rev7 updat...
Quick update to the framework that was released yesterday; I’ve added automatic graph generation. I chose DyGraphs due to the quick ability to enable support – the HTML is very quick and simply loads the CSV data. It has the same zooming features of Highcharts without the JS overhead.
Now when you run a load test you will get (i [...]
MySQL Community – what do you w...
So I’ve been doing a fair number of automated load tests these past six months. Primarily with Sysbench, which is a fine, fine tool. First I started using some simple bash based loop controls to automate my overnight testing, but as usually happens with shell scripts they grew unwieldy and I rewrote them in python. Now I have some fle [...]
MySQL and RAMdisk, or how to make tmp...
Have you ever looked at your processlist and seen queries in the state “copying to tmp table” and then run an explain on it and noticed that the tmp table is being created on disk? Happens a lot with some servers and some workloads. Of course disk is much slower than RAM so this becomes a slow process and makes queries execute s [...]
MySQL Analytics: updated query for ta...
This is a follow up to my previous post titled “MySQL analytics: information_schema polling for table engine percentages”. Here’s an updated query with more output and quicker execution time. What you get: innodb table space utilization percentage, data+index usage total and per innodb/myisam engine, innodb data/index/perc [...]
Fun with Bash: aliases make your live...
I’ve always been a big fan of having a customized .bashrc file. The one I distribute to all of my servers has aliases for quick commands to save me time on the command line, functions that get work done when aliases are too simplistic, reporting for the server for each cli login, and of course a formatted and colored prompt (for terms [...]
Win a free book at the February Pytho...
This month is a special month. It’s not because of Valentines day or even the exciting day where we see groundhogs. No, this month is special because I’m have a book contest where you, the reader, get to win something free for doing absolutely nothing more than posting a comment saying that you want one of the several books I ha [...]
Python for Automation: using pdsh for...
I’ve been playing around with some quick system automation scripts that are handy to use when you don’t want / need to setup a chef or puppet action. I like to keep all of my hostnames and login details in a MySQL database (a cmdb actually) but for this example we’ll just use a couple of nested lists. This script executes [...]
