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Dml error logging in oracle 10g release 2

Adrian Billington - Mon, 2005-08-22 03:00
A new error logging mechanism for bulk DML statements. August 2005

Dml error logging performance in 10g release 2

Adrian Billington - Mon, 2005-08-22 03:00
Performance characteristics of DML error logging. August 2005

The Don Burleson's article

Radoslav Rusinov - Sun, 2005-08-21 06:17
Added from Rado (23 August): Don updated his article again yesterday (see the link below). Now it is more detailed and there are lot of quoted documents.But there is again some questionable information:No RAM sort may use more than 5% of pga_aggegate_target or _pga_max_size, whichever is smaller. This means that no task may use more than 200 megabytes for sorting or hash joins.Again, for serial Radoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com13

Petals Around the Rose

Wijaya Kusumo - Sat, 2005-08-20 20:42
A friend introduced this interesting game to me. It is more like an observation game plus a little bit of math. Apparently it took Dr. Richard Duke at the University of Michigan over a year to "see the solution". He claimed "the smarter you were, the longer it took to figure it out". Maybe smarter people tend to think too much, or loose themselves in the details.... (hint) Interestingly I got it

The _PGA_MAX_SIZE hidden parameter

Radoslav Rusinov - Thu, 2005-08-18 11:38
Check the following links for more details regarding to my previous post (Management of the Oracle9i PGA): Discussion from Don Burleson's Oracle forum: Question for Don, Regarding _pga_max_size Article from Ora!Ora!Oracle mail magazine: Sort Metalink discussion thread: high pga_aggregate_target but low "cache hit percentage" Metalink discussion thread: PGA memory usage exceeding Radoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com5

Management of the Oracle9i PGA

Radoslav Rusinov - Thu, 2005-08-18 02:43
If you think that your PGA can be configured properly just by increasing of the PGA_AGGREGATE_TARGET parameter, think twice - it is NOT!See this article from Don Burleson: Undocumented secrets for super-sizing your PGAIt shows that there are two hidden parameters that can help for proper using of the PGA. Otherwise, Oracle will never use more than 200 MB for the whole PGA nor will it use more Radoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com3

Using of BULK COLLECT and FORALL for better performance

Radoslav Rusinov - Tue, 2005-08-16 12:38
Lets see some quotes from the Oracle documentation:---PL/SQL engine executes procedural statements but sends SQL statements to the SQL engine, which executes the SQL statements and, in some cases, returns data to the PL/SQL engine.Too many context switches between the PL/SQL and SQL engines can harm performance. That can happen when a loop executes a separate SQL statement for each element of a Radoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com6

Mac OS X on your PC

Wijaya Kusumo - Mon, 2005-08-15 20:58
With Apple moves to x86 architecture, it is no wonder people start to do "what if" scenario. And now someone built a Mac for US $199! http://osx86project.org/ It is a shame why it took Apple so long to realize its cash cow is actually on x86 platform. Just imagine if you get a Dell box pre-installed with Mac OS!

Where is Oracle?

Denis Goddard - Sat, 2005-08-13 16:34
I spent about 8 years working at Oracle Headquarters in Redwood Shores, California.
Actually, I almost took a job working for Oracle as a consultant in Columbus, Ohio; it was a tough decision. The consulting job offered more money, and Ohio is closer to my family in the midwest.

In the end, though, it was a no-brainer; I wanted to be in Development, and especially in the specific area of Configuration Management, and that job was in California.
Having made that decision, the first few years it seemed easy; Redwood Shores is the center of the Oracle universe -- the place to be!

Now, I work extremely closely with a team of (brilliant, by the way) engineers in Thames Valley Park, in England.
Also, half my team are in Bangalore (aka India Development Center, aka "IDC"). Last but not least, I made some friends in the Adelaide, Australia office (including one with an OraBlog).

Anyway... meeting times with TVP and IDC were always a hassle when I worked in California. There really is no convenient time between these 3 nearly equidistant geographical points!

Now I have spent the past 2 months working in Oracle's New England Development Center (NEDC) in Nashua, New Hampshire.
I can honestly say, from the standpoint of working with people in England and India, New England is a far, far more advantageous place to be. The 3 timezones offset from California mean I have several hours each day where the British and Indians are reasonably available. As everyone is connected via Oracle RTC (Oracle's chat program), it's quite easy to interact with everyone.

I would say to anyone that's working with folks in Bangalore or Britain -- you ought to have a look at New England. Aside from being a really nice place in its own right, the timezones are quite favorable.

For the next week I'll be back in Redwood Shores, visiting my boss, my team at Headquarters, making presentations, etc.
No doubt, I will also be eating as much Indian cuisine as I can get my hands on -- there are precious few Indian restaurants here in Nashua.

Strange behaviour of the CBO, part 2

Radoslav Rusinov - Thu, 2005-08-11 03:08
After playing around with setting of columns to allow NULL values or not (setting COL1 and COL3 to allow NULL values, test and put it again to their default condition) and precomputing statistics, the issue from previous post become more unclear.Now the structure of the table is the same like it was before, statistics are fresh but cost for the execution plan is always 175. It doesn't matter whatRadoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com0

Strange behaviour of the CBO, part 1

Radoslav Rusinov - Wed, 2005-08-10 11:36
The following interesting issue does not have clear explanation till now.I have query that is using the following predicates. ... AND COL1 LIKE '%%' AND COL2 LIKE '%%' AND COL3 LIKE '%%' AND COL4 LIKE '%%' ...May be I should explain from where is coming this strange query.If you are developping some application and you Radoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com2

How to see the MOD_PLSQL passwords in clear text

Radoslav Rusinov - Wed, 2005-08-10 09:37
If you have some web-based PL/SQL application then you can be interested in the following information.May be many DBAs who have been involved in the database security have asked themselves: "How to be sure that my DAD files hides well the application schema passwords?"Well, Oracle doesn't have very good solution for this problem.Lets take a look at one DAD file used from an Oracle Application Radoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com0

Forcing Oracle to use LOGGING mode

Radoslav Rusinov - Wed, 2005-08-10 08:43
I've just read an interesting newsletter about that how we can force the database (or some tablespace) to use the LOGGING mode for all operations. For example, lets imagine that we don't want someone improperly to start some operation in NOLOGGING mode that will lead the database to impossibility of performing of full database recovery after media failure. This could be important issue if a Radoslav Rusinovhttp://www.blogger.com/profile/18163031714036680150noreply@blogger.com0

Laws of Economics

Denis Goddard - Sun, 2005-07-31 14:15
I was listening to (a podcast of) this show and it tickled some things I've been thinking about a lot lately.

First, the laws of Economics are as valid and as real any any law of physics.
I mean this quite literally. The most well-understood economic laws are
those in idealized situations: millions of people, all acting (too) perfectly reasonably.
This is no different than the fact that Newton's Laws only hold for moles of atoms, all acting like little marbles.

Another notion I've been noodling lately is that the flow of currency through the world's people is
extraordinarliy similar in concept to the assignment of resources by an operating system.
It's not the agent that controls what happens; but it does describe how it happens.
Economics is literally the Operating System for Planet Earth.

As such, it behooves one to learn a little about Economics.
So, My plugs:

There's some more of my rant at a post on the abovementioned show's forum.

OK, back to working on this ADE Enhancement :-)

Hotel California

Denis Goddard - Tue, 2005-07-26 14:08
I just gotta say, I am so happy to be living in New Hampshire!

Aside from no state income tax, and way more trees and greenspace that California had,
the Live Free or Die state is attracting nationwide attention for the "Lost Liberty Hotel".
There was a great segment on Hannity & Colmes the other day.
Check it out!

Okay, I gotta get back to programming now...

iExpenses... things I learnt this week

Jo Davis - Tue, 2005-07-26 00:34
On 11.5.10 you can...
- display any or all of the AFF segments
- elect a percentage or otherwise of expense reports to be audited for receipts by Payables staff
- credit card charges from hotels can be itemised automatically in the upload
- policies (whilst great functionality) are a bit of a pain when trying to demo
- we can finally dispute credit card transactions on credit cards instead of just on P-Cards
- the credit card audit screen is a pain - can I go back to using the payables screen please? :)

Have a great day!

Array-based advanced queuing in 10g

Adrian Billington - Fri, 2005-07-22 03:00
Oracle 10g enables us to enqueue and dequeue in bulk. July 2005

Pl/sql timer

Adrian Billington - Fri, 2005-07-22 03:00
A simple package to output the elapsed time between two points. Supports versions from 8i onwards. July 2005

Introduction to advanced queuing

Adrian Billington - Fri, 2005-07-22 03:00
A high-level tutorial on Oracle's Advanced Queuing. July 2005

The Post Acquisition World.....

Jo Davis - Wed, 2005-07-20 23:31
Read an interesting article in the Australian CIO which raises a few points on the brave new world (post PeopleSoft acquisition) of ERP. Interesting. It might just be that the next few years are the time for everyone to sit back and have a bit of a strategic think about the world of ERP and effective strategies for managing it....


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