DBA Lounge

Concerns and What Does Not Work in XtraDB Backup

A short time ago I posted how I was Using XtraDB Backup to backup InnoDB. Overall, the blog post was positive, but experiences that others have had (and commented to on that blog post) have made me want to put out another short article about using XtraDB backup. The first few points remain the same — the backup process is stable, we were able to use the binaries without compiling, and using Innobackupex as the wrapper script, analogous to Innobackup.pl. However, we did figure out why Xtrabackup had to be run as the mysql user:

Windows PowerShell for the SQL Server DBA

Most people think Windows administrators make a living with their right-hand—you know, right-clicking and left-clicking the user interface to get things done. I’ve spent a fair amount of time writing VBScript scripts to administer Windows servers and workstations and automating repetitive tasks. One reason for me moving into Windows PowerShell is its roots in the Microsoft .NET Framework, as I have done a fair amount of .NET programming. But what is Windows PowerShell anyway?

Scalable Internet Architectures

My old friend and collaborator Theo Schlossnagle at OmniTI posted his slides from his Scalable Internet Architectures talk at VelocityConf 2009. The slides are brilliant even without seeing Theo talk and I highly recommend the time it takes to flip through them, for anyone who is interested in systems performance. If anyone took an mp3 of this talk I’m dying to hear it, please let me know. Here’s the slide deck. Let me know your thoughts.

Ubuntu 9.04 (Jaunty Jackalope), vpnc, and resolvconf

Connecting to a cisco vpn device with vpnc on jaunty. If you use vpnc and vpnc-disconnect to bring the connection up and down, all works fine. If you leave the connection idle too long and are disconnected from the other end, the resolv.conf is not always updated. This is a problem because, when you do a DNS lookup in a browser you’ll experience delays, the DNS servers from your vpn connection are no longer available. The easiest way to check this is to login to your vpn and check the contents of /etc/resolv.conf.

Trivial MySQL Variable of the Day

Today’s trivial MySQL system variable: (old_alter_table) The interesting bit is that this is a system variable, and shows up in SHOW GLOBAL VARIABLES, but is not documented on the Server System Variables manual page. Instead, it is documented on the manual page for Server options. Unfortunately, that documentation is very sparse.

Images in a database

About six months ago, the question of storing images in a database came up. This is one of my favorite topics, and has many database-agnostic parts. Personally, I think “tell me about storing images in a database” is actually a great interview question, because you will be able to see the difference between someone who has just memorized “what’s right” versus someone who is really thinking. It also helps you see how someone will communicate.

How to Recover Data from a Dead MacBook

This post might seem outside of our focus, but life brings all kinds of challenges. A friend of mine bought a MacBook when she was on vacation in the USA. Her Mac completely broke down. The service guys told her she’d need to replace the motherboard, which would cost almost the same as a new computer. The problem was her Mac wouldn’t even start, and all the data she had on a hard-drive was stuck in the neat white box without any signs of life. Sure, I said, I’m a computer guy I can recover it, can’t I?

Using Xtradb Backup

As Baron points out, Percona’s Xtrabackup tool can be used just like InnoDB Hot Backup. Many are wondering, “is it good enough?” In fact, I wondered the same thing, and after a few weeks of using and testing Xtrabackup (on machines that have MyISAM and InnoDB tables), I can say…Currently, for clients who want a hot backup solution but do not want to pay for InnoDB Hot Backup, Pythian recommends Xtrabackup.

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