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The Java Iterator interface requires one implements a hasNext method, to determine if the current item is the last to be iterated over, or not. The MySQL driver ’s implementation of the JDBC ResultSet object, if one uses streaming mode throws an exception from its isLast method. ( Streaming mode prevents the JVM from running out of memory, which it would do if it tried to fetch all the results at once.)
There was a discussion on Slashdot about corporate ethics and system administrators reading other people’s emails. That reminded me of the following story: A friend of a friend was working in IT as a Windows administrator. He was called to fix some boss’ computer, who then went out to lunch leaving the friend alone with the computer. The friend happened to see a mail on the boss’ computer that he found interesting, so he forwarded it ..
After my last post about SQL*Net message to client wait event I had a follow-up question about what’s the difference between SQL*Net message to client and SQL*Net more data to client wait events. I’ll post the answer here: The first session data unit (SDU) bufferful of return data is written to TCP socket buffer under SQL*Net message to client wait event. If Oracle needs to return more result data for a call than fits into the firs....
After my last post about SQL*Net message to client wait event I had a follow-up question about what’s the difference between SQL*Net message to client and SQL*Net more data to client wait events. I’ll post the answer here: The first session data unit (SDU) bufferful of return data is written to TCP socket buffer under SQL*Net message to client wait event. If Oracle needs to return more result data for a call than fits into the firs....
In a recent Oracle Forum thread a question came up how to use SQL*Net message to client wait events for measuring network latency between server and client. The answer is that you can’t use it for network latency measurements at all, due to how TCP stack works and how Oracle uses it. I’ll paste my answer here too, for people who don’t follow Oracle Forums: As I wrote in that reply, “SQL*Net message to client” does NOT measure netwo..
In a recent Oracle Forum thread a question came up how to use SQL*Net message to client wait events for measuring network latency between server and client. The answer is that you can’t use it for network latency measurements at all, due to how TCP stack works and how Oracle uses it. I’ll paste my answer here too, for people who don’t follow Oracle Forums: As I wrote in that reply, “SQL*Net message to client” does NOT measure netwo..
Trying to read a large amount of data from MySQL using Java using one query is not as easy as one might think. I want to read the results of the query a chunk at a time. If I read it all at once, the JVM understandably runs out of memory. In this case I am stuffing all the resulting data into a Lucene index, but the same would apply if I was writing the data out to a file, another database, etc.
I’m sure there are a lot of opinions in the world about which logger levels to use for which errors. Log levels in the sense of if a text destined for a logfile should be prefixed with “Info”, “Warning”, “Error” etc. There is even great debate about which log levels there should be. E.g. should there be a “Debug” level or a “Trace” level? Or both? In which case what’s the difference?
This series is about revealing some Oracle’s internal execution costs and inefficiencies. I will analyze few situations and special cases where you can experience a performance hit where you normally wouldn’t expect to. The first topic is about a question I saw in a recent Oracle Forum thread . The question goes like this: “Is there any benefit if I run long sql queries from the server (by using telnet,etc) or from the remote by sql c....
This series is about revealing some Oracle’s internal execution costs and inefficiencies. I will analyze few situations and special cases where you can experience a performance hit where you normally wouldn’t expect to. The first topic is about a question I saw in a recent Oracle Forum thread . The question goes like this: “Is there any benefit if I run long sql queries from the server (by using telnet,etc) or from the remote by sql c....
I have so far avoided writing such pointer blog posts which only refer you to another article, but I have to do it with this one . Adrian Billington has written an excellent article on performance of Oracle 11g PL/SQL function result cache. His article is a good example of a thorough, well organized and well written technical content. I really enjoyed reading it and thanks to his thoroughness, he has just saved me some precious time doing ..
I have so far avoided writing such pointer blog posts which only refer you to another article, but I have to do it with this one . Adrian Billington has written an excellent article on performance of Oracle 11g PL/SQL function result cache. His article is a good example of a thorough, well organized and well written technical content. I really enjoyed reading it and thanks to his thoroughness, he has just saved me some precious time doing ..
Mary Poppendieck has just published a presentation on Agile software development entering the mainstream (and how to fail with agile). The presentation contains a number of insightful key points, but one footnote struck a chord with me: According to Allen Ward’s “Lean Product and Process Development”, Handsoffs are the biggest waste of product development. This has long been a pet peeve of mine, and I want to examine why handoffs occur, why..
David Mortman, Moderator CSO-in-Residence, Echelon One Paul Proctor, Moderator VP, Gartner Window Snyder, Vendor Director of Ecosystem Development, Mozilla Corporation Ian Robertson CSO, RIM David Maynor CTO, Errata Security Dave Goldsmith Concerns about ethics for security professionals has been on the rise of late. It's time for researchers and vendors to meet up and discuss the issues of ethical behavior in our indus..
David Mortman, Moderator CSO-in-Residence, Echelon One Paul Proctor, Moderator VP, Gartner Window Snyder, Vendor Director of Ecosystem Development, Mozilla Corporation Ian Robertson CSO, RIM David Maynor CTO, Errata Security Dave Goldsmith Concerns about ethics for security professionals has been on the rise of late. It's time for researchers and vendors to meet up and discuss the issues of ethical behavior in our industry an..
David Mortman, Moderator CSO-in-Residence, Echelon One Paul Proctor, Moderator VP, Gartner Window Snyder, Vendor Director of Ecosystem Development, Mozilla Corporation Ian Robertson CSO, RIM David Maynor CTO, Errata Security Dave Goldsmith Concerns about ethics for security professionals has been on the rise of late. It's time for researchers and vendors to meet up and discuss the issues of ethical behavior in our indus..
David Mortman, Moderator CSO-in-Residence, Echelon One Paul Proctor, Moderator VP, Gartner Window Snyder, Vendor Director of Ecosystem Development, Mozilla Corporation Ian Robertson CSO, RIM David Maynor CTO, Errata Security Dave Goldsmith Concerns about ethics for security professionals has been on the rise of late. It's time for researchers and vendors to meet up and discuss the issues of ethical behavior in our industry an..
2007 held numerous watershed events for the security industry. Innovation is needed and the money is there. Come to this session and meet the VCs actively investing in security, web, and mobile applications. Learn how VCs see the future, what they are looking for, and how best to utilize them to further your innovations. This session will conclude with a announcement about the Black Hat/DEFCON Open, a business plan competition focused on in..
2007 held numerous watershed events for the security industry. Innovation is needed and the money is there. Come to this session and meet the VCs actively investing in security, web, and mobile applications. Learn how VCs see the future, what they are looking for, and how best to utilize them to further your innovations. This session will conclude with a announcement about the Black Hat/DEFCON Open, a business plan competition focused on in..
2007 held numerous watershed events for the security industry. Innovation is needed and the money is there. Come to this session and meet the VCs actively investing in security, web, and mobile applications. Learn how VCs see the future, what they are looking for, and how best to utilize them to further your innovations. This session will conclude with a announcement about the Black Hat/DEFCON Open, a business plan competition focused on in..
2007 held numerous watershed events for the security industry. Innovation is needed and the money is there. Come to this session and meet the VCs actively investing in security, web, and mobile applications. Learn how VCs see the future, what they are looking for, and how best to utilize them to further your innovations. This session will conclude with a announcement about the Black Hat/DEFCON Open, a business plan competition focused on in..
This year we will have so many feds representing their federal agencies that we will have to break it up into two separate panels: IA Panel: Information Assurance, CERTS, first responder's organizations from agencies including DC3, DHS, SOCOM, NSA, OSD, NDU, and GAO. LE Panel: and Law Enforcement, Counterintelligence agencies including DC3, FBI, IRS, NCIS, NASA, NWC3, US Postal IG, FLETC, and RCMP. Each of the agency reps ....
This year we will have so many feds representing their federal agencies that we will have to break it up into two separate panels: IA Panel: Information Assurance, CERTS, first responder's organizations from agencies including DC3, DHS, SOCOM, NSA, OSD, NDU, and GAO. LE Panel: and Law Enforcement, Counterintelligence agencies including DC3, FBI, IRS, NCIS, NASA, NWC3, US Postal IG, FLETC, and RCMP. Each of the agency reps wil....
This year we will have so many feds representing their federal agencies that we will have to break it up into two separate panels: IA Panel: Information Assurance, CERTS, first responder's organizations from agencies including DC3, DHS, SOCOM, NSA, OSD, NDU, and GAO. LE Panel: and Law Enforcement, Counterintelligence agencies including DC3, FBI, IRS, NCIS, NASA, NWC3, US Postal IG, FLETC, and RCMP. Each of the agency reps ....
This year we will have so many feds representing their federal agencies that we will have to break it up into two separate panels: IA Panel: Information Assurance, CERTS, first responder's organizations from agencies including DC3, DHS, SOCOM, NSA, OSD, NDU, and GAO. LE Panel: and Law Enforcement, Counterintelligence agencies including DC3, FBI, IRS, NCIS, NASA, NWC3, US Postal IG, FLETC, and RCMP. Each of the agency reps wil....
The defense techniques employed by large software manufacturers are getting better. This is particularly true of Microsoft who have improved the security of the software they make tremendously since their Trustworthy Computing initiative. Gone are the days of being able to penetrate any Microsoft system by firing off the RPC-DCOM exploit. The consequence of this is that post-exploitation has become increasingly important in order to "squeez....
The defense techniques employed by large software manufacturers are getting better. This is particularly true of Microsoft who have improved the security of the software they make tremendously since their Trustworthy Computing initiative. Gone are the days of being able to penetrate any Microsoft system by firing off the RPC-DCOM exploit. The consequence of this is that post-exploitation has become increasingly important in order to "squeez....
Lukas Grunwald CTO of DN-Systems Enterprise Internet Solutions GmbH This talk will show what happens if security is driven by politics and compromise, also I will cover additional security risks by the new generation of electronic passports. It will show why it could be possible to produce fake biometric fingerprints from the new generation electronic passports, for example by rogue regimes. The new bogus security attempts to se....
Lukas Grunwald CTO of DN-Systems Enterprise Internet Solutions GmbH This talk will show what happens if security is driven by politics and compromise, also I will cover additional security risks by the new generation of electronic passports. It will show why it could be possible to produce fake biometric fingerprints from the new generation electronic passports, for example by rogue regimes. The new bogus security attempts to secu....
Lukas Grunwald CTO of DN-Systems Enterprise Internet Solutions GmbH This talk will show what happens if security is driven by politics and compromise, also I will cover additional security risks by the new generation of electronic passports. It will show why it could be possible to produce fake biometric fingerprints from the new generation electronic passports, for example by rogue regimes. The new bogus security attempts to se....
Lukas Grunwald CTO of DN-Systems Enterprise Internet Solutions GmbH This talk will show what happens if security is driven by politics and compromise, also I will cover additional security risks by the new generation of electronic passports. It will show why it could be possible to produce fake biometric fingerprints from the new generation electronic passports, for example by rogue regimes. The new bogus security attempts to secu....
Not even the simplest things work with computers these days. I have an Excel sheet and I want to copy a value into an MSN conversation. On Windows. Notice the vendor of all these products. I copy the cell and in the middle of the sentence I’m tying into MSN I press Ctrl-V. MSN hangs for about 5 seconds. Then a notification is sent to the other party that I want to transfer a file, something .tmp.gif, i.e. an bitmap image of the value ....
In my last article, I showed you how to get started with your Rails application. The result of the simple commands, rails blogdemo; cd blogdemo; ruby script/generate scaffold article title:string author:string content:text; rake db:migrate; ruby script/server was that you had your own simple blog up and running. The blog support articles each of which have a title, an author, and text content. This initial model was generated for us with no..
Before I left Vienna, the Internet stopped working in my flat. There were some major electrical engineering works going on in the building, so I assumed this was the cause. Now I’ve come back, they’ve stopped, but my Internet hasn’t started working again. The modem, from my ISP Chello, was an “ARRIS type”, and the “online” light (light 2 in the following diagram) was permanently flashing. What was the modem trying to communicate to me? ..
I am planning to write a series of articles on how to get started with Ruby on Rails. One of the remarkable things about Rails is that it lets you get up and running very quickly. Here is what you need to do to get your first application up and running. Before you start, you need to install Ruby on Rails: On Macs, Rails is already available and you can type the following commands in a normal terminal window.
I just tried to start Tomcat and it refused to start because of the following error: log4j:ERROR Error occured while converting date. java.lang.NullPointerException at java.lang.System.arraycopy(Native Method) at java.lang.AbstractStringBuilder.getChars at java.lang.StringBuffer.getChars at org.apache.log4j.helpers.ISO8601DateFormat.format at java.text.DateFormat.format ... at org.apache.log4j.Category.log at org.apache.commons.log..
I was talking to my father over Christmas and he said that in his career, job titles of bosses had been various things, such as “leader of”, “head of”, etc. But he said when he started, they were called administrators . I think that’s a great name for a boss. It emphasises that the job of the boss is to get out of the way of the employees and let them get on with their jobs. It also emphasises the positive aspects of a boss from the pers..
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