Christian Bilien

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An integrated view of Oracle, Unix and storage arrays performance and tuning
Updated: 10 hours 40 min ago

oow 2010 presentation slides

Tue, 2010-09-21 09:06
Here are the slides of the presentation I did yesterday: OOW2010 Christian Bilien. The room was full and I noticed a number of people were standing at the back of the room, hope the awful sound did not add too much to the pain.
Categories: DBA Blogs

OOW 2010: my room is changed

Sat, 2010-09-18 00:35
I was informed this morning (well in my morning) that Oracle Content moved me to Room 252: ID#: S314649 Title: Large-Scale Oracle RAC (and Sun Oracle Database Machine) Scalability Design Track: Database Date: 20-SEP-10 Time: 14:00 – 15:00 Venue: Moscone South Room: Rm 252
Categories: DBA Blogs

Oracle Open World 2010

Fri, 2010-09-17 14:46
I just took a look at the OOW Oracle Content Manager: looks like my room is almost full. I suspect the Exadata has something to do with it.  My session details are: S314649 Large-Scale Oracle RAC (and Sun Oracle Database Machine) Scalability Design Date: 20-SEP-10 Time: 14:00-15:00 Venue: Moscone South Room: Rm 236 My presentation […]
Categories: DBA Blogs

This blog is inactive (at least for the time being)

Thu, 2010-08-26 14:53
It’s been more than 2 years and a half since I last blogged on Oracle performance. I had the feeling I could not carry on this extra time activity when I started managing a 20 people DBA team and 4 technologies (including 2  Oracle competitors- Microsoft and Sybase which has ASE and IQ). It would […]
Categories: DBA Blogs

I’ll be a presenter at Oracle Open World 2010

Thu, 2010-08-26 14:39
I submitted an abstract to the Oracle OpenWorld 2010 that was found to be worthwhile enough to be accepted. Here are the session details: Speaker(s) Christian BILIEN, BNP PARIBAS Corporate Investment Banking, Head of the DBAs Monday, September 20, 2:00PM | Moscone South, Rm 236 60 min. Session ID: S314649 Title: Large-Scale Oracle RAC (and […]
Categories: DBA Blogs

The “log file sync” wait event is not always spent waiting for an I/O

Tue, 2008-02-12 10:41
I went through a rather common problem some times ago, which shows how one can get easily fooled by the “log file sync” wait event. Here is a log file sync wait histogram which was interpreted as a poor storage array response time by the DBAs, often a good way to get off the hook […]
Categories: DBA Blogs

An upper bound of the transactions throughputs

Mon, 2008-01-28 15:46
Capacity planning fundamental laws are seldom used to identify benchmark flaws, although some of these laws are almost trivial. Worse, some performance assessments provide performance outputs which are individually commented without even realizing that physical laws bind them together. Perhaps the simplest of them all is the Utilization law, which states that the utilization of […]
Categories: DBA Blogs

Oracle’s clusterware real time priority oddity

Sat, 2008-01-19 12:16
The CSS processes use both the interconnect and the voting disks to monitor remote node. A node must be able to access strictly more than half of the voting disks at any time (this is the reason for the odd number of voting disks), which prevents split brain. Let’s just recall that split brains are […]
Categories: DBA Blogs

Tag flood

Fri, 2008-01-11 10:08
  Amid the tag furry, I was tagged some days ago by Jeff Moss so I’ll have to give some pieces of information about myself presumably of low interest to most. I had not put any personal information on my blog, so here are 8 of them which I’ll keep short anyway: I come from […]
Categories: DBA Blogs

Where has all my memory gone ?

Sun, 2008-01-06 14:09
A while ago, I came across an interesting case of memory starvation on a Oracle DB server running Solaris 8 that was for once not directly related to the SGA or the PGA. The problem showed up from a user perspective as temporary “hangs” that only seemed to happen at a specific time of the […]
Categories: DBA Blogs