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Yesterday, I teamed up with and old friend of mine (Scott Elliott) and went to the Ontario Linux Fest at the Toronto Congress Centre. For those who do not know Scott, he is a VMWare guru (you can join his Southwestern Ontario VMWare user’s group @ www.vmware.com ), as well as a master in the 8th layer of the OSI Model (the political layer). Although he won’t admit it, he knows UNIX very well and is an advocate of the Open Source movement..
Yesterday, I teamed up with and old friend of mine (Scott Elliott) and went to the Ontario Linux Fest at the Toronto Congress Centre. For those who do not know Scott, he is a VMWare guru (you can join his Southwestern Ontario VMWare user’s group @ www.vmware.com ), as well as a master in the 8th layer of the OSI Model (the political layer). Although he won’t admit it, he knows UNIX very well and is an advocate of the Open Source movement..
The Norwegian word “smidig” means “agile”. So when we wanted to make a Norwegian conference for the Oslo Agile community, “smidig 2007” (November 26th and 27th) was a natural choice for a title. The seed of the conference was idea by Nils Christian Haugen and Aslak Hellesøy to have a whole day devoted to open spaces. Meanwhile, I had been experimenting with “lightning talks” on Oslo XP meetup, a user group that meets in Oslo every month.
In light of the upcoming Ontario Linux Fest, I decided to use this blog entry to reflect on Open Source Software and Linux. Free Software and the Free Software Foundation (FSF) were pioneered by the famous Richard Stallman. Free Software does not mean “at no monetary cost”……..it means that the source code is free to anyone who wants to use it (source code freedom). In the words of Stallman, think “free” as in “freedom”, not “free” as in..
On my stereo at home it plays fine (although it doesn’t work on my Windows computer ) but put it into my girlfriend’s DVD player and it reports itself to have 17 tracks even though the cover says it only has 15. I hadn’t looked closely at the reported track count on the DVD player and just played the disk. After the peaceful ending of the last track on the CD i.e. the 15th, the speakers just erupted in loud white noise. I suppose that was ..
In light of the upcoming Ontario Linux Fest, I decided to use this blog entry to reflect on Open Source Software and Linux. Free Software and the Free Software Foundation (FSF) were pioneered by the famous Richard Stallman. Free Software does not mean “at no monetary cost”……..it means that the source code is free to anyone who wants to use it (source code freedom). In the words of Stallman, think “free” as in “freedom”, not “free” as in..
I’m using Windows, and it seems that in one new aspect, I discover that Windows just doesn’t work. (Or maybe it’s the CD that doesn’t work?) Ideally I would have put the CD in the computer’s drive and it would have just played it. This was Bill Gates’ vision once. I think prior to Windows 95’s launch, he said “I imagine a day when you can just put a Beethoven CD in the drive and Windows will play the song”. (Although I couldn’t find that ..
Update: As this original article is from 2007, there are better options available in the modern times – for example DBMS_UTILITY.EXPAND_SQL_TEXT as explained by Maria Colgan’s blog entry here . If you have been involved in tuning SQL code which you have never seen before, you are probably familiar with the challenges of understanding what the code is trying to do. This can be especially time consuming when the SQL references lots of vi....
Update: As this original article is from 2007, there are better options available in the modern times – for example DBMS_UTILITY.EXPAND_SQL_TEXT as explained by Maria Colgan’s blog entry here . If you have been involved in tuning SQL code which you have never seen before, you are probably familiar with the challenges of understanding what the code is trying to do. This can be especially time consuming when the SQL references lots of vi....
My presentation at JavaZone was riddled with technical difficulties this year. To make a long story short: I learned five minutes before the presentation the the projector would be inoperative for a while (turned out to be 30 minutes). This threw a wrench into my plans, as I had planned to open with a demo. I have read many times on presentation zen about presenting without slides. But before I stood in front of four hundred people with not..
My talk at JavaZone went surprisingly well. The fact that the projector went dead and that I was planning on opening with a demo raised my pulse, but I felt I managed to get my message across and that people were happy. The talk was about how we use Jetty to manage the full deployment life cycle of our application. I explained how we had implemented this and what problems we had solved.
I just feel that in this company, there’s too many chiefs and not enough Indians.” “Sure. Now, if they’d only been Indian chiefs.” I have been real quiet lately. I will try to be better about writing in the future. I’ll do my best to stay away from project management issues, though. I’ve stepped on enough toes lately, I think. Here are some teasers of upcoming topics: REST, Quaere, introducing tests into existing code bases, the Norwegian c..
First, some background. I have an iBook G4 12" that I bought in August 2005, so that I would have a handy laptop during my studies. I also bought AppleCare, because I thought it would be better to pay 300€ extra to be sure that the laptop would serve me at least three years, instead of the one year default warranty. Of that decision, I’m glad.
First, some background. I have an iBook G4 12" that I bought in August 2005, so that I would have a handy laptop during my studies. I also bought AppleCare, because I thought it would be better to pay 300€ extra to be sure that the laptop would serve me at least three years, instead of the one year default warranty. Of that decision, I’m glad.
First, some background. I have an iBook G4 12" that I bought in August 2005, so that I would have a handy laptop during my studies. I also bought AppleCare, because I thought it would be better to pay 300€ extra to be sure that the laptop would serve me at least three years, instead of the one year default warranty. Of that decision, I’m glad.
I used to think of a function as something which would convert some input value into some output value (potentially with some side-effects). And thus unit testing a function would involve passing particular inputs into the function and checking that the results were as expected (potentially setting up some database rows or something to test that the side-effects were executed properly). But sometimes a function relies on a particula..
Java Enum instances are singletons. This seems to be not clearly documented by Sun (at least I found it difficult to find). But it’s the case. What this means is that it’s possible to compare enumerated types by identity, which is cool for readability. (And it means that the switch statement works.) You don’t have to write this: if (PurchaseState.complete.equals(anItem.getPurchaseState()) { ... You can write: if (anItem.getPurchaseS..
or rather thread stack as nowadays decent operating systems execute threads (or tasks as they’re called in Linux kernel). Anyway, stack trace gives you the ultimate truth on what your program is doing, exactly right now. There are couple of but’s like stack corruptions and missing symbol information which may make the traces less useful for us, but for detailed hang & performance troubleshooting the stack traces are a goldmine. So, I pr..
or rather thread stack as nowadays decent operating systems execute threads (or tasks as they’re called in Linux kernel). Anyway, stack trace gives you the ultimate truth on what your program is doing, exactly right now. There are couple of but’s like stack corruptions and missing symbol information which may make the traces less useful for us, but for detailed hang & performance troubleshooting the stack traces are a goldmine. So, I pr..
I know the rules for Oracle row locking well. A row can be locked for write if one updates it, or if one “select for update"s it. create table a (x number); (and equivalent in MySQL for InnoDB) Session A: insert into a values (9); Session A: commit; Session A: start transaction (in MySQL) Session A: select * from a where x=9 for update; Session B: start transaction (in MySQL) Session B: select * from a where x=9 ..
I have just viewed some photos on Facebook. They were of a friend’s trip to Malaysia. Facebook has a limit of 60 photos per album; meaning you have to split photos up into albums with names like “Malaysia 1”, “Malaysia 2” etc if you want to upload more than 60 photos in total. Each album, as is current practice in web design, is divided into pages with “page next” buttons to get to the next page. Each page of each album, as was introduced..
Whenever delivering some Oracle training or running a demo at a conference, I’ve always liked to use the Windows command prompt version of sqlplus. One reason of course is its easy command line history navigation capability ( press F7 in cmd.exe after entering few commands to see why ). Another reason is that whenever I want to highlight some part of sqlplus output, I can just drag a selection rectangle around that text. In other words ..
Whenever delivering some Oracle training or running a demo at a conference, I’ve always liked to use the Windows command prompt version of sqlplus. One reason of course is its easy command line history navigation capability ( press F7 in cmd.exe after entering few commands to see why ). Another reason is that whenever I want to highlight some part of sqlplus output, I can just drag a selection rectangle around that text. In other words ..
As you probably already know, the Session Snapper has been designed to be a very easy-to-use performance tool. It is especially useful in database environments where there are no decent performance tools pre-installed and available. Snapper doesn’t require any setup, all you need is to log on to the database using sqlplus and download snapper.sql script to your computer. Well, actually the second part is not required, as Oracle sqlplu....
As you probably already know, the Session Snapper has been designed to be a very easy-to-use performance tool. It is especially useful in database environments where there are no decent performance tools pre-installed and available. Snapper doesn’t require any setup, all you need is to log on to the database using sqlplus and download snapper.sql script to your computer. Well, actually the second part is not required, as Oracle sqlplu....
There was a discussion about whether Oracle really allocates all memory for SGA immediately on instance startup or not. And further, whether Oracle allocates memory beyond the SGA_TARET if SGA_MAX_SIZE is larger than it. It’s worth reading this thread first: http://forums.oracle.com/forums/thread.jspa?threadID=535400&tstart=0 I will paste an edited version of my reply to here as well:
There was a discussion about whether Oracle really allocates all memory for SGA immediately on instance startup or not. And further, whether Oracle allocates memory beyond the SGA_TARET if SGA_MAX_SIZE is larger than it. It’s worth reading this thread first: http://forums.oracle.com/forums/thread.jspa?threadID=535400&tstart=0 I will paste an edited version of my reply to here as well:
There are two ways for diagnosing problems: Checking for the usual suspects and hoping to find a matching one Following a systematic approach Checking for the usual suspects and hoping to find a matching one The first approach relies on previous experience (both in particular subject area/technology and about the context/environment the problem occurs). For example if a patient comes to doctor complaining about pain in chest, then for d..
There are two ways for diagnosing problems: Checking for the usual suspects and hoping to find a matching one Following a systematic approach Checking for the usual suspects and hoping to find a matching one The first approach relies on previous experience (both in particular subject area/technology and about the context/environment the problem occurs). For example if a patient comes to doctor complaining about pain in chest, then for d..
The main design goal of Session Snapper was that it should not require any changes to be made into database. And to achieve this goal, I was even willing to sacrifice some functionality. So, for example there is no sorting capability in Snapper output. It would have been easy to create an SQL Type to database, use that as session statistics storage and query results out using an order by on statistics delta column – giving you (probably....
The main design goal of Session Snapper was that it should not require any changes to be made into database. And to achieve this goal, I was even willing to sacrifice some functionality. So, for example there is no sorting capability in Snapper output. It would have been easy to create an SQL Type to database, use that as session statistics storage and query results out using an order by on statistics delta column – giving you (probably....
This is my attempt for getting cheap popularity out of recent Oracle 11g release. This is not going to be another Oracle 11g new features list, I’ll be just posting any of my research findings here, in a semi-organized way. The first post is is about Automatic Memory Management. AMM manages all SGA + PGA memory together, allowing it to shift memory from SGA to PGAs and vice versa. You only need to set a MEMORY_TARGET (and if you like, MEM....
This is my attempt for getting cheap popularity out of recent Oracle 11g release. This is not going to be another Oracle 11g new features list, I’ll be just posting any of my research findings here, in a semi-organized way. The first post is is about Automatic Memory Management. AMM manages all SGA + PGA memory together, allowing it to shift memory from SGA to PGAs and vice versa. You only need to set a MEMORY_TARGET (and if you like, MEM....
A post by Jonathan Lewis inspired me to finally complete my version of the Oracle session performance snapper script, which main characteristics are it reports Oracle session level performance counter and wait information in real time it does NOT require any database objects to be created If you are a DBA or consultant working on ad-hoc performance issues, you will like it! Are you familiar with following situation? (Monday mo....
A post by Jonathan Lewis inspired me to finally complete my version of the Oracle session performance snapper script, which main characteristics are it reports Oracle session level performance counter and wait information in real time it does NOT require any database objects to be created If you are a DBA or consultant working on ad-hoc performance issues, you will like it! Are you familiar with following situation? (Monday mo....
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