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Displaying posts with tag: speculations (reset)
Fixing Broken MySQL Replication: Basic Usage of pt-table-checksum, pt-slave-restart and pt-table-sync

For second day in a row I am trying to concentrate on writing a second issue for my new series of blog posts, but I can not complete. It seems half of it is going to be devoted to three tools from Percona Toolkit that I had to remember and explain this week: pt-table-checksum, pt-table-sync and pt-slave-restart. So, I decided to write a separate post on this topic.

The context was simple: in the middle of (the weekend) night customer comes with broken replication issue, without a fresh backup from master or with few gigabytes …

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MySQL Support Engineer's Chronicles, Issue #1

I have a habit to keep a log of everything I work on (or even just read about while working) every day. It's just a plain text file, with date labels, where most lines are URLs of issues and bugs I contributed to somehow, and my comments on what I did and why. But there are also code fragments, texts, copy-pasted outputs and links to interesting sites, articles and documentation.

Some of lines from this log I post on Facebook separately as I add them, these are mostly related to MySQL bugs and other things that annoy me. I know that some of my Facebook friends actually do not like this kind of posts at all... When I used LiveJornal actively, I've posted digests of my log from time to time (you can check what was there if you read Russian). But that digests …

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Fun with Bugs #45 - On Some Bugs Fixed in MySQL 5.7.15

Oracle released MySQL 5.7.15 recently, earlier than expected. The reason for this "unexpected" release is not clear to me, but it could happen because of a couple of security related internal bug reports that got fixed:

  • "It was possible to write log files ending with .ini or .cnf that later could be parsed as option files. The general query log and slow query log can no longer be written to a file ending with .ini or .cnf. (Bug #24388753)
  • Privilege escalation was possible by exploiting the way REPAIR TABLE used temporary files. (Bug #24388746)"

Let me concentrate on the most important fixes to bugs and problems reported by Community users. …

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Fun with Bugs #44 - Community Bugs Fixed in MySQL 5.7.14

MySQL 5.7.14 was officially released yesterday. So, it's time to check what bugs reported by MySQL Community in public were fixed in this release. Some of these bugs are presented below.

As usual, let me start with InnoDB. The following bugs were fixed there:

  • Bug #80296 - "FTS query exceeds result cache limit". It was reported (for 5.6, but I do not see new 5.6 release notes yet) by Monty Solomon and verified by Umesh.
  • Bug #80304 - "generated columns don't work with foreign key actions". It was reported by Guilhem Bichot based on test case by Peter Gulutzan presented …
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Fun with Bugs #43 - Bugs Fixed in MySQL 5.7.13

For some reason I do not see numerous public announcements about recent MySQL 5.7.13 release, even though it happened a couple of days ago formally. Maybe that's because we do not have any really "big" new features in this release (new ->> operator for introduced though for those who, unlike me, care about JSON). Still there are many fixes for bugs previously reported by Community (or Oracle engineers, but still in public bugs database), and I'd like to discuss some of them.

Let me start with the bug that was NOT fixed though, Bug #81093, "mysqld_multi not included in mysql-community-server package", reported by Georgi Iovchev and …

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Fun with Bugs #42 - Bugs Fixed in MySQL 5.7.12

MySQL 5.7.12 was released more than 2 weeks ago. New features introduced there in a form of "rapid plugins" are widely discussed, but I am more interested in bugs reported by MySQL Community users that are fixed there. Unfortunately I do not see MySQL Community Release Notes by Morgan (like this) for quite a some time, so I have to continue describing key bug fixes and name people who reported and verified bugs in my "Fun with Bugs" series.

As usual, let's start with InnoDB bugs fixed:

  • Bug #80070 - "allocated_size and file_size differ if create general tablespace outside datadir". It was reported by my former colleague from Percona …
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On Upgrades to Percona Server 5.7 GA: Ubuntu 14.04 Case

After upgrading Percona Server 5.6.28 (and "full stack" of Percona software) to 5.7.10-3 GA on CentOS 6 and building it from Git Source on Fedora Core 23 yesterday, I've decided to spend some time upgrading Percona Server on my netbook that plays a role of "home build/test/VMs server" and runs under Ubuntu 14.04:
openxs@ao756:~$ uname -a
Linux ao756 3.13.0-77-generic #121-Ubuntu SMP Wed Jan 20 10:50:42 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
openxs@ao756:~$ cat /etc/issue
Ubuntu 14.04.4 LTS \n \lIt had the following set of Percona packages (as a result of some tests with Percona XtraDB Cluster I had to use sometime while working there) and mysqld process running after OS …

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On Upgrades to Percona Server 5.7 GA: Building from Git Source on Fedora

While writing my first post in this series I was bulding Percona Server 5.7 from Git sources on my wife's Fedora Core 23 box based on this manual page, for my collection of test instances. As I build MySQL and related software from sources on different platforms almost every day for 11 years already, the process was completed successfully without much troubles, but there are still some details I'd like to highlight.

Manual says one has to do the following:

$ git clone
$ …
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On Upgrades to Percona Server 5.7 GA: CentOS 6 Case

As you probably noted, Percona had finally released Percona Server 5.7 GA two days ago. I had not paid much attention to this branch during last month or so, but as it's GA now I decided to check what's there, how it works and install/upgrade different boxes and VMs to use it.

For testing purposes and for this series of blog posts I am going to build it from Git source (at least on Fedora Core 23), upgrade to it on 32-bit Ubuntu 15.04 VM, upgrade to it on 64-bit Ubuntu 14.04 laptop, upgrade to it on 64-bit CentOS 6.7 VM and maybe more. If any of the attempts to install/upgrade ends up with something worth sharing, I am going to write about the experience, problems (if any) and solutions.

Yesterday I've spent some …

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MySQL Support People - Directors, Managers and Coordinators

This post is devoted to my colleagues whose contribution to MySQL Support was really important, but mostly non-technical, that is, pure Directors, Managers and Coordinators, who hardly ever reported any bug in MySQL in public and had to step into the technical issues from customers mostly when we, engineers, failed to some extent:

  • Tom Basil - he hired me twice, first as a Director of Support in MySQL back in 2005 and then as a COO in Percona in 2012. Tom was a Director of Support and Development (thanks Salle for clarification) in MySQL since 2001 and he defined, to large extent, the Support culture I am proud to be a part and defender of till today. The approach to providing Support 24x7 by the international team of the best engineers working remotely from home and coordinated by one of them, playing the role of Support Shift …
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