Showing entries 1 to 6
Displaying posts with tag: Q&A (reset)
MySQL QA Episode 11: Valgrind Testing: Pro’s, Con’s, Why and How

Today’s episode is all about Valgrind – from the pro’s to the con’s, from the why to the how! This episode will be of interest to anyone who is or wants to work with Valgrind on a regular or semi-regular basis.

  1. Pro’s/Why
  2. Con’s
  3. How
    1. Using the latest version
      sudo [yum/apt-get] install valgrind
      #OR#
      sudo [yum/apt-get] remove valgrind
      sudo [yum/apt-get] install bzip2 glibc*
      wget http://valgrind.org/downloads/valgrind-3.10.1.tar.bz2
      tar -xf valgrind-3.10.1.tar.bz2; cd valgrind-3.10.1
      ./configure; make; sudo make install
      valgrind –version # This should now read 3.10.1
    2. VGDB (cd ./mysql-test)
      ./lib/v1/mysql-test-run.pl –start-and-exit –valgrind –valgrind-option=”–leak-check=yes”
      –valgrind-option=”–vgdb=yes” …
[Read more]
MySQL QA Episode 10: Reproducing and Simplifying: How to get it Right

Welcome to the 10th episode in the MySQL QA series! Today we’ll talk about reproducing and simplifying: How to get it Right.

Note that unless you are a QA engineer stuck on a remote, and additionally difficult-to-reproduce or difficult-to-reduce bug, this episode will largely be non-interesting for you.

However, what you may like to see – especially if you watched episodes 7 (and possibly 8 and 9) – is how reducer automatically generates handy start/stop/client (cl) etc. scripts, all packed into a handy bug tarball, in combination with the reduced SQL testcase.

This somewhat separate part is covered directly after the introduction (ends at 11:17), as well as with an example towards the end of the video (starts at time index 30:35).

The “in between part” (11:17 to 30:35) is all about reproducing and simplifying, which – unless you are working on a remote case – can likely be skipped by …

[Read more]
MySQL QA Episode 9: Reducing Testcases for Experts: multi-threaded reducer.sh

Welcome to MySQL QA Episode 9. This episode will go more in-depth into reducer.sh: Reducing Testcases for Experts: multi-threaded reducer.sh

We will explore how to use reducer.sh to do true multi-threaded testcase reduction – a world’s first.

Topics:

  1. Expert configurable variables & their default reducer.sh settings
    1. PQUERY_MULTI
    2. PQUERY_MULTI_THREADS
    3. PQUERY_MULTI_CLIENT_THREADS
    4. PQUERY_MULTI_QUERIES
    5. PQUERY_REVERSE_NOSHUFFLE_OPT

Full-screen viewing @ 720p resolution recommended.

The post MySQL QA Episode 9: Reducing Testcases for Experts: multi-threaded reducer.sh appeared first on …

[Read more]
MySQL QA Episode 8: Reducing Testcases for Engineers: tuning reducer.sh

Welcome to MySQL QA Episode 8: Reducing Testcases for Engineers: tuning reducer.sh

  1. Advanced configurable variables & their default/vanilla reducer.sh settings
    1. FORCE_SKIPV
    2. FORCE_SPORADIC
    3. TIMEOUT_COMMAND & TIMEOUT_CHECK
    4. MULTI_THREADS
    5. MULTI_THREADS_INCREASE
    6. QUERYTIMEOUT
    7. STAGE1_LINES
    8. SKIPSTAGE
    9. FORCE_KILL
  2. Some examples
    1. FORCE_SKIPV/FORCE_SPORADIC
    2. TIMEOUT_COMMAND/TIMEOUT_CHECK

Full-screen viewing @ 720p resolution recommended.

The post MySQL QA Episode 8: Reducing Testcases for Engineers: tuning …

[Read more]
Choosing a MySQL HA Solution – Post-Webinar Q&A

Thanks to everyone who was in attendance on 05 June 2013 for my “Choosing a MySQL HA Solution” webinar. If you weren’t able to make it but are interested in listening to the presentation, it’s currently up and available for viewing over at percona.com.

My apologies if we weren’t able to get to your question during the initial session, so I’ll address those lingering questions in this post, along with providing a bit more detail on some of the questions that I did cover during the session.

Q: What is the reason that I recommended DRBD be used only on physical hardware and not on virtual machines?
A: I covered this a bit during the session, but to provide a bit more commentary. There …

[Read more]
Semi-live blog from Q&A with Sun/MySQL VP of community

Here’s  my sort of transcript of the most important things that were said during the Q&A with Kaj Arno at FOSDEM09. If you have any questions (or corrections if you were there and think i misinterpreted) please use the comments. It is virtually unedited, so it’s rough but I don’t have the time right now to [...]

Showing entries 1 to 6