Monday and today (Tuesday) I attended a 2-days Oracle University class with Craig Shallahamer from OraPub, taking place in Munich. Honestly, I have had no expectations at all, so there has been nothing to be crestfallen or to be fulfilled. I just was looking forward to the one or other hint how to find the […]
Category: IT
memlock config for Debian Lenny
Hi, today I tried to start Oracle XE with parameters “pre_paged_sga=true” and “lock_sga=true” on my Debian Lenny toybox. But Lenny has had a rather strict and really sticky value for the user’s maximum amount of pinned memory (ulimit -l) value: 32 (kb). First attempt, change /etc/security/limits.conf: oracle – memlock 1073741824 Result: Nothing, “ulimit -l” as […]
Oracle DML Parallel Execution Don’ts
Have you ever waited on a parallelized statement? Parallel execution is said to be fast, efficient, system-exhausting. Far from that! There’s a 10.2.0.4 x86_64 system with 16 cores and over 600MB/s write-IO ability, one statement running, one CPU burning, one developer waiting. For days. Finally, at the end of the week, the admin is involved. […]
“16 penguins in a row” and a Linux kernel compilation contest (2min 33sec)
A nice view: What’s the story behind? […]
Nerd compliments.
If anybody ever considers joining irc.freenode.net #oracle (what I’d recommend for all Oracle interested folks), be prepared for being treated like that: <nayyares> it worked !!! <usn> wait some time, it might crash, or restart all cluster services to see if there is a boot bug <nayyares> ok, i am monitoring usn <Rudemeister> Im also […]
Sun ZFS – cool stuff
Basically, I don’t like mirroring google. But this one is really cool stuff, and, by the way, it’s merely linking google. ZFS-Video by Systemhelden Yeah, I really like it! But the video has a weak point: After randomizing the devices this way, you can’t simply pull the plug of one USB hub any more. Anyway, […]
New blood in IT sector (partially German)
Doing chat support in several IRC channels, I’m hardened in several ways. Especially newbie questions are not always easy to handle for all participants. Let me give you an example (in German), how things sometimes are seen by the youngsters. […]
TEMP tablespace too small
Today I got a mail from my grid control: “Tablespace TEMP1 is 97% full”, acting for one of the single instance servers. No problem, you may think, this might happen. It’s an OLAP database, so I wasn’t afraid of big numbers as well. But as you can see, using all this huge temp tablespace for […]
Cleanly removing an agent or host target from Oracle Grid Control 10.2.0.4
Removing a host/agent in Oracle’s Grid Control can be unnerving: There are enough dependencies between the agent, the (cluster-)database, the listener, the host and so to make your deleting action an endless sequence if you are following them. But GC really becomes stubborn if the agent we are about to remove is unavailable: due to […]
Blocking network loopback slows down firefox extremely
My newly installed Firefox web browser (versions 2 and 3, does not matter) was deadly slow. I don’t mean the display of web sites, no, I am talking about pulldown-menus or opening tabs. (For example, bookmarks folder opens within 6 long seconds.) Several hours I was not able to tell why it acts that way. […]