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MySQL Support Engineer's Chronicles, Issue #10

As promised, I am trying to write one blog post in this series per week. So, even though writing about InnoDB row formats took a lot of time and efforts this weekend, I still plan to summarize my findings, questions, discussions, bugs and links I've collected over this week.

I've shared two links this week on Facebook that got a lot of comments (unlike links to my typical blog posts). The first one was to Marko Mäkelä's blog post at MariaDB.com, "

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Fun with Bugs #85 - On MySQL Bug Reports I am Subscribed to, Part XX

We have a public holiday here today and it's raining outside for a third day in a row already, so I hardly have anything better to do than writing yet another review of public MySQL bug reports that I've subscribed to recently.

Not sure if these reviews are really considered useful by anyone but few of my readers, but I am still going to try in a hope to end up with some useful conclusions. Last time I've stopped on Bug #94903, so let me continue with the next bug in my list:

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Fun with Bugs #84 - On Some Public Bugs Fixed in MySQL 5.7.26

Oracle released minor MySQL Server versions in all supported branches on April 25, 2019. MySQL 5.7.26 is just one of them, but recently I prefer to ignore MySQL 8 releases (after checking that I can build them from source code at least somewhere, even if it takes 18G+ of disk space and that they work in basic tests), as there are more chances for MySQL 5.7 bug fixes to affect me (and customers I care about) directly.

So, in this yet another boring blog post (that would never be a reason for any award) I plan to concentrate …

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Fun with Bugs #83 - On MySQL Bug Reports I am Subscribed to, Part XIX

I have not much yet to say on a popular topic of upgrading everything to MySQL 8, so let me just continue reviewing public MySQL bug reports that I've subscribed to recently. After my previous post at least one bug, Bug #94747, got enough comments and clarifications (up to specific commit that introduced this regression pointed out by Daniel Black!) to have it re-classified and verified as InnoDB code bug. So, I see good reasons to continue attracting wide public attention …

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Fun with Bugs #82 - On MySQL Bug Reports I am Subscribed to, Part XVIII

I've got few comments to my post on references to MariaDB in MySQL bug reports (not in the blog, but via social media and in personal messages), and all but one comments from current and former colleagues whose opinion I value a lot confirmed that this really looks like a kind of attempt to advertise MariaDB. So, from now on I'll try to keep my findings on how tests shared by MySQL bug reporters work in MariaDB for myself, MariaDB JIRA and this blog (where I can and will advertise whatever makes sense to me), and avoid adding them to MySQL bug reports.

That said, I still think that it's normal to share links to MariaDB bug reports that add something useful (like patches, …

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On References to MariaDB and MariaDB Bugs (MDEVs) in MySQL Bug Reports

Recently I noted that some of my comments to public MySQL bug reports got hidden by somebody from Oracle with privileges to do so. I was not able to find out who did that and when, as this information is not communicated to bug subscribers (this may change if my feature requests, Bug #94807 - "Subscriber should be notified when comment is made private", is eventually implemented).

When it happened for the first time I thought it was probably non-intentional. When it happened for a second time I complained with a tweet that got few likes and zero comments. Recently this happened again and yet another tweet had not got much attention, but at least I've got a comment via …

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Fun with Bugs #81 - On MySQL Bug Reports I am Subscribed to, Part XVII

Two weeks passed since my previous review of public MySQL bug reports I consider interesting enough to subscribe to them. Over this period I picked up a dozen or so new public bug reports that I'd like to briefly review today.

Here is my recent subscriptions list, starting from the oldest bug reports:

  • Bug #94431 - "Can't upgrade from 5.7 to 8.0 if any database have a hyphen in their name". It seems one actually needs a database like that created in MySQL 5.6 with at least one InnoDB table having FULLTEXT index to hit the problem. Great finding by Phil Murray. Note that after several unsuccessful attempts by others the bug was eventually reproduced and verified by …
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Fun with Bugs #80 - On MySQL Bug Reports I am Subscribed to, Part XVI

Today I'd like to continue my review of public MySQL bug reports with a list of some bugs I've subscribed to over last 3 weeks. It's already long enough and includes nice cases to check and share. Note that I usually subscribe to a bug either because it directly affects me or customers I work with, or I consider it technically interesting (so I mostly care about InnoDB, replication, partitioning and optimizer bugs), or it's a "metabug" - a problem in the way public bug report is handled by Oracle engineers. These are my interests related to MySQL bugs.

As usual, I start with the oldest bugs and try to mention bug reporters by name with links to their other reports whenever this may give something useful to a reader. I try …

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Fun with Bugs #79 - On MySQL Bug Reports I am Subscribed to, Part XV

More than 3 weeks passed since my previous review of public MySQL bug reports I am subscribed to, so it's time to present some of the bugs I've considered interesting in January, 2019.

As usual, I'll review them starting from the oldest and try to summarize my feelings about these bugs at the end of this post. Here they are:

  • Bug #93806 - "Document error about ON DUPLICATE KEY UPDATE". Years pass, but fine MySQL manual still does not explain some cases of InnoDB locking properly. Xiaobin Lin found yet another case that it does not explain properly. Or, maybe, the manual is correct and the problem in …
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On my Favorite FOSDEM 2019 MySQL, MariaDB and Friends Devroom Talks

This year I had not only spoken about MySQL bugs reporting at FOSDEM, but spent almost the entire day listening at MySQL, MariaDB and Friends Devroom. I missed only one talk, on ProxySQL, (to get some water, drink a bottle of famous Belgian beer and chat with my former colleague in MySQL support team, Geert, whom I had not seen for a decade). So, for the first time out of my 4 FOSDEM visits I've got a first hand impression about the entire set of talks in the devroom that I want to share today, while I still remember my feelings.

Most of the talks have both slides and videos …

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