DBA Lounge
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.
Welcome, readers! It’s time for another update to our series of posts on installing Oracle on Ubuntu Linux. In this edition, we’ll be installing Oracle 11g R1 on Ubuntu 9.04, both 32-bit. This time, I’ve used VirtualBox to run a virtual machine (VM) to perform our work.
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.
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.
This meetup will be focused on storage technologies for Oracle database. It looks like a short presentation on Oracle Automatic Storage Management is in order – quite a few people are missing the concepts of the Oracle flagman storage storage solution and it’s useful to understand the approach whether you use it now or not.
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.
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?
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.
One of the topics that beginners RAC DBA’s (along with network engineers supporting Oracle database infrastructure) are confused about is the Virtual IP usage in Oracle RAC starting from Oracle Clusterware 10g. With this videocast, I will try to clarify those concerns once and for all. I have embedded the video here in a smaller window so you might want to go directly to YouTube for the full-size version of “Pythian Video: Oracle RAC – Why VIPs”.
The Ottawa Perl Mongers will be meeting once again at the Pythian headquarters. There will be two presentations given: Yanick Chanpoux will be presenting on Moose. Tim Procter (myself) will be presenting on Portable Perl Daemons. The focus is on developing light-weight background processes that will be compatible with both Unix and Windows systems. Additionally, I will be demonstrating communications with the daemon and child processes over TCP from an independent controller. The presentations are now available online thanks to Andrew Ross at the Free and Open Source Software Learning Centre. Comments are welcome.
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