As with Quiz 1, Quiz 2 will be open book and open computer, but no Internet will be allowed. Fri, 4 May 2012 11:05:00 EDT Professor Madden will have office hours on Monday at 4PM and Tuesday at 5PM in his office, 32-G938. Fri, 4 May 2012 11:00:00 EDT <a href="http://db.csail.mit.edu/6.830/assignments/lab5.html">Lab 5<a> is posted. It is due Thursday, May 17. Only students taking 6.814 need to turn in this lab. Wed, 2 May 2012 00:00:01 EDT We've posted a PHP script that allows you to estimate your performance so far in the class by plugging in the grades you've received thus far and comparing your performance against the class median. <p> The script for 6.814 is <a href="http://db.csail.mit.edu/6.830/grade814.php">here<a>. <p> The script for 6.830 is <a href="http://db.csail.mit.edu/6.830/grade814.php">here<a>. <p> You should be able to get current scores for Lab 1, Lab 2, PS1, PS2, and Quiz 1 from Stellar. We will post Lab 3 grades later tonight. Wed, 25 Apr 2012 21:04:00 EDT We've posted an addendum to Monday's lecture on how Pig programs get translated into Map Reduce jobs <a href="http://db.csail.mit.edu/6.830/lectures/lec18-pigtomr.pdf">here<a>. Tue, 24 Apr 2012 14:13:00 EDT Solutions to Problem set 2 have been posted on the homeworks page. Wed, 11 Apr 2012 01:00:01 EDT <a href="http://db.csail.mit.edu/6.830/assignments/lab4.html">Lab 4<a> is posted. It is due Monday, April 30. Only students taking 6.814 need to turn in this lab. Wed, 11 Apr 2012 00:00:01 EDT <a href="http://db.csail.mit.edu/6.830/assignments/ps3.pdf">Problem Set 3<a> is posted. It is due Monday, May 7. Fri, 6 Apr 2012 14:00:00 EST 6.830 students should <a href="https://signup.mit.edu:444/signup.php?id=6830_2012">sign up<a> for a meeting with Professor Madden to discuss progress on their final projects. Only one team member per group should sign up. Slots are distributed over several weeks -- if you need feedback soon or have already made a lot of progress, please meet sooner. Otherwise, sign up for a slot in a couple of weeks when you will have something to talk about. Each slot is 20 minutes. If none of these times work for you, please contact Professor Madden about an alternate meeting time. Thu, 5 Apr 2012 08:05:00 EDT Quiz 1 solutions have been posted. Mon, 2 Apr 2012 15:50:00 EDT <a href="http://db.csail.mit.edu/6.830/assignments/lab3.html">Lab 3<a> is posted. It is due Monday, April 9. Sun, 25 Mar 2012 21:15:00 EDT Quiz 1 is on Wednesday, 3/21, during class. The quiz will be open notes, and you may bring a laptop. We will require that you disable wireless on your laptop, and you will not be permitted to use a web browser, so please load all of the notes, documents, etc onto it before the exam. Mobile phones may not be used. Sat, 17 Mar 2012 21:15:00 EDT Professor Madden will have pre-exam office hours from 3--4 PM and 5--6 PM on Tuesday 3/20, in his office, 32-G938. Sat, 17 Mar 2012 21:14:00 EDT We'll be having two review sessions for Lab 2 this week. The first on Monday 3/12 at 5:30pm in 32-D463 and the second on Tuesday 3/13 at 6:30pm in 32-G882. These review sessions are being held in place of the regular office hours, so we won't be holding any office hours on Monday or Thursday. We'll be going over SimpleDB components that need to be implemented for lab 2. We expect these review sessions to be shorter compared to those for lab1, and the remaining time will be spent on any questions/bugs that you guys might have. Mon, 12 Mar 2012 14:30:00 EDT Solutions to problem set 1 have been posted on the homeworks page. Fri, 9 Mar 2012 06:00:00 EST A <a href="assignments/q1-2009.pdf">Sample Quiz 1<a> and <a href="assignments/q1-2009-solns.pdf">Solutions<a> have been posted Wed, 7 Mar 2012 15:40:00 EST 6.830 students should <a href="https://signup.mit.edu:444/signup.php?id=6830_2011">sign up<a> (corrected URL) for a meeting with Professor Madden to discuss their final project ideas. Meetings are on Thursday and Friday of this week, and last 20 minutes. Each group should sign up for just one slot. If you can't find a time that works for you, please email Professor Madden. Mon, 5 Mar 2012 20:22:00 EST <a href="http://db.csail.mit.edu/6.830/assignments/lab2.html">Lab 2<a> is posted. It is due Friday, March 16. Fri, 2 Mar 2012 22:00:00 EST <a href="http://db.csail.mit.edu/6.830/assignments/final_proj.html">A description of the final project and some sample project ideas<a> are posted. The project proposal is due March 14, and the final project is due May 17. Fri, 2 Mar 2012 14:58:00 EST <a href="http://db.csail.mit.edu/6.830/assignments/ps2.pdf">Problem Set 2<a> is posted. It is due Monday, March 19. Mon, 27 Feb 2012 22:54:00 EST We'll be having two review sessions for Lab 1 this week. The first on Monday 7:00pm-8:00pm and the second on Tuesday 6:30pm-7:30pm. Both review sessions will be held in 32-G449 (Kiva). These review sessions are being held in place of the regular office hours, so we won't be holding any office hours on Thursday night. In the review sessions, we'll be going over architectural details of SimpleDB and physical layout of data in databases. The remaining time will be spent on any questions/bugs that you guys might have. Sun, 26 Feb 2012 00:30:00 EST There is a bug in Lab 1, where the name of a method is misleading. isSlotFree() in HeapPage should instead be called isSlotUsed() (as the specification suggests). If you haven't started the lab yet, you can simply download the tarball again which includes the necessary changes. <p> If you have started the lab, you download and apply a patch to fix this bug. Download the patch from <a href="http://db.csail.mit.edu/6.830/assignments/lab1.patch">http://db.csail.mit.edu/6.830/assignments/lab1.patch<a> and copy it to the top level for your 6.830-lab1 directory. Then open up a shell, change your working directory to the top level of your 6.830-lab1 directory and run "patch -p1 < lab1.patch". <p> Alternatively, you can manually make the required changes. Do a string search for "isSlotFree" and replace it with "isSlotUsed" in files src/simpledb/HeapPage.java, test/simpledb/HeapFileReadTest.java and test/simpledb/HeapPageReadTest.java. <p> If you have any problems, come to OH today or post a question on Piazza. Thu, 23 Feb 2012 13:45:00 EST <a href="http://db.csail.mit.edu/6.830/assignments/lab1.html">Lab 1<a> is posted. It is due Friday, March 2. Tue, 21 Feb 2012 23:00:00 EST We received a complaint from the owners of linerva.mit.edu today that 6.814/6.830 sqlite jobs were making the machine unusable. <p> The issue is that long running queries use 100% of the CPU on the machine, and when several of you log in and run queries and leave them running for a long time, it can make the machine very slow.<p> Therefore, we ask that you respect the following guidelines: <ol> <li> Please try to use a machine other than linerva or one of the athena.dialup machines if at all possible. The best would be if you have a personal linux or mac machine to download the database and run locally. Otherwise, visit an athena cluster if you have one near you. <li> No query should take longer than 5 minutes to run. Please kill your queries that run longer than 5 minutes by typing "Ctrl-C" to abort them and find a way to rephrase your query. Please contact us if you need help figuring out what is wrong with your query. </ol> If you are unable to find another machine please contact us and we will try to find a machine for you to run on. <p> Sorry for any inconvenience this may cause you. Sun, 19 Feb 2012 20:42:00 EST <a href="http://db.csail.mit.edu/6.830/assignments/ps1.pdf">Problem Set 1<a> is posted. It is due Tuesday, February 21. Mon, 13 Feb 2012 07:54:00 EST Many of the readings from this class will come from the book "Readings in Database Systems" (aka the "Red Book"). You can access this book online, from books 24x7.com, as long as you have an MIT account. To do this: <ul> <li> Log in to books24x7.com via the MIT library proxy, by going to <a href="http://library.books24x7.com.libproxy.mit.edu/">this link</a>. You will need to first log in to the library proxy, and then to books24x7.com. <li> Access the page for the text book, via <a href="http://library.books24x7.com.libproxy.mit.edu/toc.aspx?bookid=10757">this link</a>. </ul> Wed, 08 Feb 2012 09:38:00 EST The first class will be Wednesday, February 8, 2012, at 2:30 PM in 32-155. See you there! We will post announcements for the class on this page; subscribe to the <a href="http://db.csail.mit.edu/6.830/events.xml">RSS Feed</a> for updates. Mon, 06 Feb 2012 21:34:00 EST For online discussions, questions, and feedback this semester, we are going to be using Piazza (an online discussion forum). Please <a href="http://piazza.com/mit/spring2012/6830">sign up here</a>. Wed, 01 Feb 2012 15:40:00 EST The <a href="http://db.csail.mit.edu/6.830/syllabus.html">syllabus</a> and <a href="http://db.csail.mit.edu/6.830/sched.html">schedule</a> are now available. Wed, 01 Feb 2012 14:45:00 EST