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Displaying posts with tag: Roel Van de Paar (reset)
Percona Monitoring and Management (PMM) Information Script

This blog post discusses an information script for the Percona Monitoring and Management (PMM) tool.

In recent news, we announced the fresh-of-the-press Percona Monitoring and Management (or PMM for short) platform. Given the interaction of the different components that together make up PMM, I developed a script that helps provide you information about the status of your PMM installation.

You can use this script yourself, or one of our support might point you to this page to obtain the information they need to troubleshoot an issue you are experiencing.

You will likely want to execute this script once on the PMM …

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7 Fresh Bugs in MySQL 8.0

This blog post will look at seven bugs in MySQL 8.0.

Friday afternoon is always ideal for a quick look at the early quality of MySQL 8.0! Last Friday, I did just that.

If you haven’t heard the news yet, MySQL 8.0 DMR is available for download on mysql.com!

Tools to the ready: pquery2, updated 8.0 compatible scripts in Percona-qa and some advanced regex to wade through the many cores generated by the test run. For those of you who know and use pquery-run.sh, this should mean a lot!

[09:41:50] [21492] ====== TRIAL …
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Regular Expressions Tutorial

This blog post highlights a video on how to use regular expressions.

It’s been a while since I did the MySQL QA and Bash Training Series. The 13 episodes were quite enjoyable to make, and a lot of people watched the video’s and provided great feedback.

In today’s new video, I’d like to briefly go over regular expressions. The session will cover the basics of regular expressions, and then some. I’ll follow up later with a more advanced regex session too.

Regular expressions are very versatile, and once you know how to use them – especially as a script developer or software coder – you will return to them again and again. Enjoy!

Presented …

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MySQL 8.0

If you haven’t heard the news yet, MySQL 8.0 is apparently the next release of the world-famous database server.

Obviously abandoning plans to name the next release 5.8, Percona Server’s upstream provider relabelled all 5.8-related bugs to 8.0 as follows:

Reported version value updated to reflect release name change from 5.8 to 8.0

What will MySQL 8.0 bring to the world?

While lossless RBR has been suggested by Simon Mudd (for example), the actual feature list (except a Boost 1.60.0 upgrade!) remains a secret.

As far as bug and feature requests go, a smart google query revealed which bugs are likely …

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MySQL 5.7 By Default 1/3rd Slower Than 5.6 When Using Binary Logs

Researching a performance issue, we came to a startling discovery:

MySQL 5.7 + binlogs is by default 37-45% slower than MySQL 5.6 + binlogs when otherwise using the default MySQL settings

Test server MySQL versions used:
i7, 8 threads, SSD, Centos 7.2.1511
mysql-5.6.30-linux-glibc2.5-x86_64
mysql-5.7.12-linux-glibc2.5-x86_64

mysqld –options:

--no-defaults --log-bin=mysql-bin --server-id=2

Run details:
Sysbench version 0.5, 4 threads, socket file connection

Sysbench Prepare: 

sysbench --test=/usr/share/doc/sysbench/tests/db/parallel_prepare.lua --oltp-auto-inc=off --mysql-engine-trx=yes --mysql-table-engine=innodb --oltp_table_size=1000000 --oltp_tables_count=1 --mysql-db=test --mysql-user=root --db-driver=mysql --mysql-socket=/path_to_socket_file/your_socket_file.sock prepare …
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MySQL is crashing: a support engineer’s point of view

In MySQL QA Episode #12, “MySQL is Crashing, now what?,” Roel demonstrated how to collect crash-related information that will help Percona discover what the issue is that you are experiencing, and fix it.

As a Support Engineer I (Sveta) am very happy to see this post – but as a person who better understands writing than recording – I’d like to have same information, in textual form. We discussed it, and decided to do a joint blog post. Hence, this post

If you haven’t seen the video yet, or you do not have any experience with gdb, core files and crashes, I highly recommend to watch it first.

Once you have an idea of why crashes happen, what to do after it happens in your environment, and how to open a  …

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MySQL Quality Assurance: A Vision for the Future by Roel Van de Paar (Final Episode 13)

Welcome to the final – but most important – episode in the MySQL QA Series.

In it, I present my vision for all MySQL Quality Assurance – for all distributions – worldwide.

Episode 13: A Better Approach to all MySQL Regression, Stress & Feature Testing: Random Coverage Testing & SQL Interleaving

1. pquery Review
2. Random Coverage Testing
3. SQL Interleaving
4. The past & the future

Presented by Roel Van de Paar. Full-screen viewing @ 720p resolution recommended

Interested in the full MySQL QA Series?

The post MySQL Quality Assurance: A Vision for the Future by Roel Van de Paar (Final Episode 13) appeared first on MySQL Performance Blog. …

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MySQL QA Episode 12: My server is crashing… Now what? For customers or users experiencing a crash

My server is crashing… Now what?

This special episode in the MySQL QA Series is for customers or users experiencing a crash.

  1. A crash?
    1. Cheat sheet: https://goo.gl/rrmB9i
    2. Sever install & crash. Note this is as a demonstration: do not action this on a production server!
      sudo yum install -y http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm
      sudo yum install -y Percona-Server-client-56 Percona-Server-server-56
      sudo service mysql start
  2. Gimme Stacks!
    1. Debug info packages (can be executed on a production system, but do match your 5.5, 5.6 or 5.7 version correctly)
      sudo yum install -y Percona-Server-56-debuginfo
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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” …
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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 …

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