Archive for March, 2008

OraPerf.com back online 0

I was just looking up a link to the original YAPP paper so that I could include it in the course notes and then noticed Anjo Kolk’s site is back online. I think it might be a little while before things are back to normal, though - sounds like there’s a bit of work to be done ….

ASH and the psychology of Hidden Parameters 0

Time for a quick break from the final push to complete the course slides. I’ve (probably foolishly) decided to apply the 10.2.0.4 patch to my test database.

As I was confirming the details of when Oracle starts to flush information from the ASH Buffer to the workload repository, I thought I’d check the value as it’s defined in a hidden parameter, _ash_eflush_trigger. The default is 66, which means that the flush begins whenever the circular buffer is 66% used, to stop it from wrapping around on itself, or filling up, whichever description you prefer.

Wierd PL/SQL 0

Collaborate08, annual conference of the International Oracle User Group, and several other national and international user groups, will be held in Denver this year, from April 13th to the 16th. I am going to present three papers, including (for the first time) Weird PL/SQL. I thought you might enjoy reading about some of the weirdnesses of PL/SQL in my ToadWorld blog, so here’s an excerpt from the beginning of my whitepaper.