I ran into something with mysql cluster today which boggles my mind.  On http://dev.mysql.com/doc/refman/5.0/en/mysql-cluster-config-params-ndbd.html page, it is documented that if we you change datamemory parameter in the config.ini under mysql-cluster like below, you would have to restart nodes to reread the configuration. [NDBD] id=2 HostName=10.0.0.2   # the IP of the first data node DataMemory=6G IndexMemory=512M But when I tried the: [...] …

I am reaching out to mysql experts out there! We just inherited a site which uses MySQL master/slave replication. We set up the master and slaves per MySQL documents and did some of our own tweaking in my.cnf to get things working. Things were great when we were testing the site but [...] …

One of my clients asked me today to make their MySQL installation go back to default database install. Basically they wanted me to get rid of all their databases (in this case test databases) so they can start fresh and go live with only the databases they needed. So here are the steps [...] …

One of the mysql database servers I manage started to have issues with doing backups yesterday. mysqldump was running but nothing was happening on the backup side. I started to investigate to see why our full backups were failing. I opened up the mysql error log file (mine is at: /usr/local/mysql/var/hostname.err) [...] …

One very interesting thing I noticed with MySQL was that if you delete a database, ibdata file doesn’t shrink by that much space to minimize disk usage. I deleted the database and checked usage of /usr/local/mysql/var folder and noticed that ibdata file is still the same size. So the problem I face now [...]

In one of my previous posts: MySQL backups, I talked about using a script for automating backups. I show that we can use gzip to compress backup file to compress and save. Since then, our backup file has been growing meg or two a day which is causing our backup files to get [...]

Now since I reinstalled Vista 32bit version and its up and running, lets go through what works what don’t.

1. Daemon Tools (check)
2. Microsoft Office (check)
3. Trillian (check)
4. VMWare Server (CHECK!)
5. Diskeeper 10 (Nope, apparently I have to go download an update for Vista, postponed)

Ok now the fun part starts. How to get everything working the way I want to.

I need to start my Fedora virtual machine so I can get some development/testing done. And a wall I hit. It says that I don’t have permissions to open the file. I am logged in as a user which belongs to Administrators group. So why do I not have permission? Well let me copy it to desktop and see if that works. Voila! it does! Ok.. I will let this one go since I have already wasted my whole weekend getting Vista going.

OK.. so lets change my hosts file so I can point some domain names to …

While looking through my new Vista, I found out that my cpu is 64bit capable! I was like.. OMFG hell yeah! I whipped out the 64bit Vista DVD and nuked all my hard work of setting up software without even giving it a second thought… About 20 mins later, I was back in my new found love, except this time I dove right into installing software. One by one, I get basic stuff installed in following order:

1. daemon tools (went out and got the upgraded vista version) no problems
2. Microsoft Office 2007 ultimate, uh.. thank god no problems there
3. McAfee VirusScan, ofcourse problems.. knew that from 32 bit version but what the hell.. was worth a try
4. Trillian - another no problem
5. VMWare Server………………………………………….PROBLEMS! Sigh.. they don’t support 64bit Vista. Who would’ve known? They support installing 64bit version as virtual machines but then why they don’t …

There I was sitting and working and minding my own business when I heard bunch of noise outside of my office. So I took my headphones off to tune in to the conversation. One of the developers has gone out and bought Windows Vista Ultimate edition and was talking about installing it and trying it out. I have always tried out all of the Windows flavors since 3.1 as soon as they came out and even did beta runs for NT 4, XP, 2000, 2003 and even Vista. But for some reason after installing and running beta 2 of Windows Vista, I wasn’t very impressed. But when they were talking about installing Vista, I myself got curious to find out how good/bad is the released version. So I went and got myself a copy of Vista Ultimate as well.

I didn’t want to destroy my laptop so I decided to install it on my old computer. The specs of that computer are:

Intel Pentium 3.2 with hyperthreading, 2 gig ram, Nvidia GeForce Ultra with Dual DVI

…

I have been asked numerous times what does “load average” means in top. If you don’t know what top is and you have access to linux machine, go type top now and see what it shows.

load average: 2.05, 2.17, 1.93

Quick answer is: first number (2.05) is 1 minute avg, second number (2.17) is 5 minute avg, third number (1.93) is 15 min avg. Generally system admins look at these #’s to see how is their server is doing. But now you wonder, if this is the #’s you look at, why is there cpu %? Isn’t that computer load also? Ofcourse it is. BUT, meaning of cpu % shown in [ Cpu(s): 14.2% us, 1.7% sy, 0.0% ni, 80.7% id, 3.1% wa, 0.0% hi, 0.3% si, 0.0% st ] actually just means how much % of time was spent doing stuff on cpu. On the other hand, load average takes other things such as how much cpu’s were being used and how many process had to wait for their turn to use cpu, etc. Thats why sometimes you will see high % for Cpu …