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  • Last chance to vote in Optimizer Bumper Sticker Competition

    - by Maria Colgan
    There is still time to vote in our competition to find the best Optimizer bumper sticker, which we will give away at the Optimizer demo booth at this years Oracle Open World. Click here to vote for your favorite. Then stop by the Optimizer demo booth at Oracle Open World to claim your bumper sticker! Remember voting will close on June 30th and the winning slogan will be announced in early July. +Maria Colgan

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  • Optimizer Bumper Sticker Competition

    - by Maria Colgan
    For the last couple of months we have been running a competition on twitter (@SQLMaria) looking for the best Optimizer bumper sticker, which we will give away at the Optimizer demo booth at this years Oracle Open World. We got tons of excellent entries and had a tough time narrowing it down to just 5 but we have. So now we need your help to pick the final winner. Click here to vote for your favorite. Then stop by the Optimizer demo booth at Oracle Open World to claim your bumper sticker!

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  • Sorting a string in array, making it sparsely populated.

    - by S1syphus
    For example, say I have string like: duck duck duck duck goose goose goose dog And I want it to be as sparsely populated as possible, say in this case duck goose duck goose dog duck goose duck What sort of algorithm would you recommend? Snippets of code or general pointers would be useful, languages welcome Python, C++ and extra kudos if you have a way to do it in bash.

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  • We have a winner!

    - by Maria Colgan
    Thank you all for voting for your favorite Optimizer bumper sticker slogans. We are proud to announce we have a winner! With over 40% of the votes "Proud parent of a child cursor" will be the official Optimizer bumper sticker at this year's Oracle Open World! Don't forget you will be able to pickup your Optimizer bumper sticker at the Optimizer demo booth in the Oracle demo grounds! Looking forward to seeing you there! +Maria Colgan

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  • Python most common element in a list

    - by Richard
    What is an efficient way to find the most common element in a Python list? My list items may not be hashable so can't use a dictionary. Also in case of draws the item with the lowest index should be returned. Example: >>> most_common(['duck', 'duck', 'goose']) 'duck' >>> most_common(['goose', 'duck', 'duck', 'goose']) 'goose'

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  • postfix concurrency limit with round robin dns

    - by goose
    Take the following internal round robin dns setup mymta.com. IN A 172.31.1.1 mymta.com. IN A 172.31.1.2 mymta.com. IN A 172.31.1.3 mymta.com. IN A 172.31.1.4 mymta.com. IN A 172.31.1.5 mymta.com. IN A 172.31.1.6 mymta.com. IN A 172.31.1.7 mymta.com. IN A 172.31.1.8 mymta.com. IN A 172.31.1.9 mymta.com. IN A 172.31.1.10 Now assume the following postfix setup (assume these are the only tweaks from defaults in debian package) main.cf: smtp_connection_cache_destinations = mymta.com smtp_connection_cache_reuse_limit = 750 smtp_destination_concurrency_limit = 75 transport * :[mymta.com] I would expect 75 concurrent connections spread across the 10 A records I've set in DNS. However I'm seeing more than a few hundred connections to mymta.com and I'm wondering if Postfix is "smart" enough to set up 75 concurrent connections for each IP address. Thoughts?

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  • Exposing a pointer in Boost.Python

    - by Goose Bumper
    I have this very simple C++ class: class Tree { public: Node *head; }; BOOST_PYTHON_MODULE(myModule) { class_<Tree>("Tree") .def_readwrite("head",&Tree::head) ; } I want to access the head variable from Python, but the message I see is: No to_python (by-value) converter found for C++ type: Node* From what I understand, this happens because Python is freaking out because it has no concept of pointers. How can I access the head variable from Python? I understand I should use encapsulation, but I'm currently stuck with needing a non-encapsulation solution.

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  • Figuring out page size with YSlow / Web Developer extension

    - by Goose Bumper
    I'm trying to figure out how much javascript is being loaded on my website. I'm using Reducisaurus to shrink my js files. The problem is, this is causing both YSlow and the Web Developer extension report the size of my files as ~.04K, which I know can't be right (one of the .js files is jquery, which is 50kb). Is there any way to accurately figure out how much time I've saving by using Reducisaurus?

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  • What are some tips for troubleshooting builds of complicated software?

    - by Goose Bumper
    Sometimes I want to build Python or GCC from scratch just for fun, but I can't parse the errors I get, or don't understand statements like "libtool link error # XYZ". What are some tricks that unix/systems gurus use to compile software of this size from scratch? Of course I already do things like read config.log (if there is one), google around, and post in newsgroups. I'm looking for things that either make the process go smoother or get me more information about the error to help me understand and fix it. It's a little tough to get this information sometimes, because some compile bugs can be quite obscure. What can I do at that point?

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  • Base class pointer vs inherited class pointer?

    - by Goose Bumper
    Suppose I have a class Dog that inherits from a class Animal. What is the difference between these two lines of code? Animal *a = new Dog(); Dog *d = new Dog(); In one, the pointer is for the base class, and in the other, the pointer is for the derived class. But when would this distinction become important? For polymorphism, either one would work exactly the same, right?

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  • Returning references while using shared_ptrs

    - by Goose Bumper
    Suppose I have a rather large class Matrix, and I've overloaded operator== to check for equality like so: bool operator==(Matrix &a, Matrix &b); Of course I'm passing the Matrix objects by reference because they are so large. Now i have a method Matrix::inverse() that returns a new Matrix object. Now I want to use the inverse directly in a comparison, like so: if (a.inverse()==b) { ... }` The problem is, this means the inverse method needs to return a reference to a Matrix object. Two questions: Since I'm just using that reference in this once comparison, is this a memory leak? What happens if the object-to-be-returned in the inverse() method belongs to a boost::shared_ptr? As soon as the method exits, the shared_ptr is destroyed and the object is no longer valid. Is there a way to return a reference to an object that belongs to a shared_ptr?

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  • Why is this basic equality test failing?

    - by Goose Bumper
    I have a pointer m to an object, and calling m->det() returns 14 (the return type is a double). Why would the following statement evaluate to false? cout << (m->det()==14) << endl; I just don't understand how this could be failing. Using cout << m->det() << endl; cout << (m->det()==14) << endl; gives me: 14 0

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  • Writing a custom iterator -- what to do if you're at the end of the array?

    - by Goose Bumper
    I'm writing a custom iterator for a Matrix class, and I want to implement the increment method, which gets called when the iterator is incremented: void MatrixIterator::increment() { // go to the next element } Suppose the iterator has been incremented too many times and now points to past the end of the matrix (i.e. past the one-past-the-end point). What is the best practice for this situation? Should I catch this with an assert, or should I just say it's the user's responsibility to keep track of where the iterator is pointing and it's none of my business?

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  • Day 4 of Oracle OpenWorld 2012 October 3rd

    - by Maria Colgan
    Thanks to all those who stopped by the demogrounds  to chat with the Optimizer developers and to check out what is new in the Oracle Optimizer over the last two days. Remember, today is the last day of the demogrounds, so if you haven't had a chance to stop by and collect you bumper sticker yet, do so today. The Optimizer developers will be there from 9:45 am until 4pm. Don't forget our second technical session (Session CON8457) is tomorrow at 12:45pm. +Maria Colgan

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  • Friday Fun: Spell Blazer

    - by Asian Angel
    Are you ready for some fun and adventure after a long week back at work? This week’s game combines jewel-matching style game play with an RPG story for an awesome mix of fun and fiction. Your goal is to help a young wizard reach the magic academy in Raven as the forces of darkness are building. Spell Blazer The object of the game is to help young Kaven reach the Lightcaster Academy in Raven alive, but he will encounter many dangers along the way. Are you ready to begin the quest? As soon as you click Start Game the intro will automatically begin. If this is your first time playing the game the intro provides a nice background story for the game and what is happening in the game environment. Once you are past the intro, you will see a map of the region with your starting point in the Farmlands, various towns and the roads connecting them, along with your final destination of Raven. Notice that some of the roads are different colors…those colors indicate the “danger levels” for each part of your journey (green = good, yellow = some danger, etc.). To begin your journey click on the Town of Goose with your mouse. You will encounter your first monster part of the way towards Goose. This first round takes you through the game play process step-by-step. Once you have clicked Okay you will see the details about the monster you have just encountered. It is very important that you do not click on Fight! or Flee! until viewing and noting the types of spells that the monster is resistant to or has a weakness against. Choose your spells wisely based on the information provided about the monster. Keep in mind that the healing spell can be very useful depending on the monster you meet and your current health status. Note: Spells shown in order here are Healing, Fireball, Icebolt, & Lightning. Ready to fight! The first battle will also explain how to fight…click Okay to get started. Once the main window is in full view there are details that you need to look at. Beneath each of the combatants you will see the three attacks that each brings to the battle and at the bottom you will see their respective health points. We got lucky and had an Icebolt attack that we could utilize on the first play! Note: You can exchange two squares without making a match in order to try and line up an attack. While it happened too quickly to capture in our screenshot, there will be cool lightning bolt effects shoot out from matched up squares to the opposite combatant. You will also see the amount of damage inflicted from a particular attack on top of the avatars. Victory! Once you have won a round of combat a window will appear showing the amount of gold coins left behind by the monster. When you reach a town you will have the opportunity to stop over and rest or directly continue on with your journey. On to Halgard after a good rest! Play Spell Blazer Latest Features How-To Geek ETC How To Boot 10 Different Live CDs From 1 USB Flash Drive The 20 Best How-To Geek Linux Articles of 2010 The 50 Best How-To Geek Windows Articles of 2010 The 20 Best How-To Geek Explainer Topics for 2010 How to Disable Caps Lock Key in Windows 7 or Vista How to Use the Avira Rescue CD to Clean Your Infected PC The Deep – Awesome Use of Metal Objects as Deep Sea Creatures [Video] Convert or View Documents Online Easily with Zoho, No Account Required Build a Floor Scrubbing Robot out of Computer Fans and a Frisbee Serene Blue Windows Wallpaper for Your Desktop 2011 International Space Station Calendar Available for Download (Free) Ultimate Elimination – Lego Black Ops [Video]

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  • Silly Developers, VirtualBox Is For Sysadmins!

    - by rickramsey
    That's one of my favorite bumper stickers. (Well, along with the sticker placed upside down on Jeep windows that says "If you can read this, roll me over.") I don't object to the "silly boys" sticker because, in my humble opinion, girls look much cuter in Jeeps than guys do. But as Ginny Henningsen points out, a similar sentiment can be applied to Oracle VM VirtualBox. While writing her other sysadmin-related articles for OTN, Ginny horsed around with VirtualBox so much that she fell in love with it. Not as a developer, but as a sysadmin. Read why she thinks it's such a great sysadmin tool: My New Favorite Sysadmin Tool: Oracle VM VirtualBox Here are some of Ginny's other articles: How I Simplified Oracle Database Installation on Oracle Linux Best Way to Update Software With IPS Best Way to Automate ZFS Snapshots and Track Software Updates Best Way to Update Software in Zones - Rick Ramsey Website Newsletter Facebook Twitter

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  • An Alternate Vision of the Original Mario Movie [Video]

    - by Asian Angel
    In this alternate vision of the original movie, Joe Nicolosi shows us a Mario who is down and out on his luck and has lost his girlfriend to a yuppie, but refuses to give up. Can Mario turn things around? Warning: Video contains language that may be considered inappropriate. “Mario” – SXSW 2011 Film Bumper [via Geeks are Sexy] How to Enable Google Chrome’s Secret Gold IconHow to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To Know

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  • Day 2 of Oracle OpenWorld 2012 October 1st

    - by Maria Colgan
    Oracle OpenWorld started yesterday and San Francisco is just buzzing with Oracle folks! If you are attending the conference don't miss the opportunity to chat with the Optimizer development team at one of our technical sessions or at the Oracle Demo grounds. Our first technical session(Session CON8455) happens tomorrow at 1:15pm but the Oracle Optimizer Demo booth opens today. We are located in the database demo grounds, in Moscone South, booth number 3157. Members of the Optimizer team will be available from 9:45am to 6pm today, to answer any Optimizer questions you might have and of course to dole out our limited edition Optimizer bumper stickers! The must have souvenir from this years conference +Maria Colgan

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  • Day 3 of Oracle OpenWorld 2012 October 2nd

    - by Maria Colgan
    Hopefully you enjoyed yesterday, the first full day of technical sessions at Oracle OpenWorld and are ready for more today! Today we give our first technical session, Oracle Optimizer: Harnessing the Power of Optimizer Hints (Session CON8455) at 1:15pm, in Moscone South - room 103. In this session we will discuss in detail how Optimizer hints are interpreted, when they should be used, why they appear to be ignored and what you can do if you have inherited a hint ridden application. The Optimizer team will also be at the Oracle Database Demogrounds all day.  Demogrounds open at 9:45 am and run until 6pm. So stop by and find out what's new with the Optimizer and the statistics that feed it. Don't forget to pick up your Optimizer bumper sticker while you are there! +Maria Colgan

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  • Iterating through a directory with Ant

    - by Shaggy Frog
    Let's say I have a collection of PDF files with the following paths: /some/path/pdfs/birds/duck.pdf /some/path/pdfs/birds/goose.pdf /some/path/pdfs/insects/fly.pdf /some/path/pdfs/insects/mosquito.pdf What I'd like to do is generate thumbnails for each PDF that respect the relative path structure, and output to another location, i.e.: /another/path/thumbnails/birds/duck.png /another/path/thumbnails/birds/goose.png /another/path/thumbnails/insects/fly.png /another/path/thumbnails/insects/mosquito.png I'd like this to be done in Ant. Assume I'm going to use Ghostscript on the command line and I've already worked out the call to GS: <exec executable="${ghostscript.executable.name}"> <arg value="-q"/> <arg value="-r72"/> <arg value="-sDEVICE=png16m"/> <arg value="-sOutputFile=${thumbnail.image.path}"/> <arg value="${input.pdf.path}"/> </exec> So what I need to do is work out the correct values for ${thumbnail.image.path} and ${input.pdf.path} while traversing the PDF input directory. I have access to ant-contrib (just installed the "latest", which is 1.0b3) and I'm using Ant 1.8.0. I think I can make something work using the <for> task, <fileset>s and <mapper>s, but I am having trouble putting it all together. I tried something like: <for param="file"> <path> <fileset dir="${some.dir.path}/pdfs"> <include name="**/*.pdf"/> </fileset> </path> <sequential> <echo message="@{file}"/> </sequential> </for> But unfortunately the @{file} property is an absolute path, and I can't find any simple way of decomposing it into the relative components. If I can only do this using a custom task, I guess I could write one, but I'm hoping I can just plug together existing components.

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