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Displaying posts with tag: Percona (reset)
Fun with Bugs #95 - On MySQL Bug Reports I am Subscribed to, Part XXIX

With conferences cancelled or postponed and people forced to stay at home due to COVID-19 wide spreading, what can be better than to give my readers a new list of MySQL bugs to check? Useful reading should help! So today I continue my previous post with a quick review of bugs I've subscribed to in February, 2020, while things were still going as usual for most of us...

Here is the list of InnoDB, replication, optimizer and some other bugs to note while working with recent MySQL 5.7.x and 8.0.19 releases:

  • Bug #98473 - "group replication will be block after lock table". This problem report by
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MySQL GTID Replication and lower_case_table_names

Error 'Table 'EMPLOYEES.POSITION' doesn't exist' on query. Default database: 'employees'. Query: 'ALTER TABLE EMPLOYEES.POSITION ADD COLUMN phone VARCHAR(15)' Interesting , table exist on slave server . But we are getting above error frequently and unable to broken the replication because database size is too big

We are having environment as GTID replication setup with windows server (Master) to Ubuntu Linux machine (Slave) . When we dig into all the findings , concluded its may be with case sensitivity issue . Lower_case_table_names variable value is same on both servers . But as per MySQL documents  Database and table names are not case-sensitive in Windows , but are case-sensitive in most varieties of Unix.Column,index,stored routine, and event names are …

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Sensitive Data Cleaning with MasKING

Wow !!! Its easy too restore sensitive data without any fear !!!

Its really tough sometimes , we restored the sensitive data without knowing and test mails triggered to customer as $100 deducted from your account for purchase . Its strange scenario when we missed to cleansing the customer data in DEV Sandbox !!!

Yes MasKING sensitive / Credential is easy now !!! Reference : https://github.com/kibitan/masking

Just tried simple practice for masking the paymentdb table data with masking , Its working as expected

Step 1 : Installed latest Ruby version and masking using below commands . Before doing install , update the server with latest packages

rvm install ruby-2.6.3
gem install masking

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Fun with Bugs #90 - On MySQL Bug Reports I am Subscribed to, Part XXIV

Previous post in this series was published 3 months ago and the last Bug #96340 from it is already closed as fixed in upcoming MySQL 8.0.19. I've picked up 50+ more bugs to follow since that time, so I think I should send quick status update about interesting public MySQL bug reports that are still active.

As usual I concentrate mostly on InnoDB, replication and optimizer bugs. Here is the list, starting from the oldest:

  • Bug #96374  - "binlog rotation deadlock when innodb concurrency limit setted". This bug was reported by …
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Repair GTID Based Slave on Percona Cluster


Problem : 

We are running 5 node percona cluster on Ubuntu 16.04, and its configured with master-slave replication. Suddenly we got an alert for replica broken from slave server, which was earlier configured with normal replication 

We have tried to sync the data and configure the replication, unable to fix that immediately due to huge transactions and GTID enabled servers. So we have decided to follow with innobackupex tool, and problem fixed in 2 hours 
Followed all the steps from percona doc and shared the experience in my environment 
Steps involving to repair the broken Replication :
1.Backup master server  2.Prepare the backup  3.Restore and Configure the Replication 4Check Replication Status
1.Backup …

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MySQL, MariaDB & Friends DevRoom CfP is now open !

Good news ! Once again, the MySQL, MariaDB & Friends Devroom has been accepted for FOSDEM’20‘s edition !!

This event is a real success story for the MySQL ecosystem; the content, the speakers and the attendees are growing every year.

FOSDEM 2020’s edition will take place 1st & 2nd February in Brussels and our MySQL, MariaDB & Friends devroom will run on Saturday 1st (may change). FOSDEM & MySQL/MariaDB is a love story started 20 years ago !

The committee selecting the content for our devroom is not yet created and if you want to be part of this experience, just send me an email (candidate at mysqlmariadbandfriends dot eu) before Oct 26th.

If you want to join the Committee you have to align with the following conditions:

  • planning to be present at FOSDEM
  • having a link …
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Fun with Bugs #88 - On MySQL Bug Reports I am Subscribed to, Part XXII

It's Saturday night. I have a week of vacation ahead that I am going to spend at home, working on things I usually do not have time for. I already did something useful (created a couple of test cases for MariaDB bugs here and there, among other things), so why not to get some fun and continue my previous review of recent interesting MySQL bug report...

So, here is the list of 15 more MySQL community bug reports that I've subscribed to back in May and June 2019:

  • Bug #95491 - "The unused wake up in simulator AIO of function reserve_slot". I am impressed by …
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Fun with Bugs #87 - On MySQL Bug Reports I am Subscribed to, Part XXI

After a 3 months long break I'd like to continue reviewing MySQL bug reports that I am subscribed to. This issue is devoted to bug reports I've considered interesting to follow in May, 2019:

  • Bug #95215 - "Memory lifetime of variables between check and update incorrectly managed". As demonstrated by Manuel Ung, there is a problem with all InnoDB MYSQL_SYSVAR_STR variables that can be dynamically updated. Valgrind allows to highlight it.
  • Bug #95218 - "Virtual generated column altered …
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Our recap of the Percona Live Conference in Austin

We were pleased to sponsor the Percona Live Conference in Austin this year: many thanks to the Percona Team for organising a smooth conference yet again!

This is the recap of our week in Texas!

At The Conference

This year’s conference was the first one not taking place in Santa Clara, CA, but rather in Austin, TX. This turned out to be a nice choice by Percona, as it meant that open source database users who may not have travelled to California in the past, were attracted to the new location; and Austin being the new hot spot for (tech) companies at the moment, a lot of “locals” seemed to have made the choice to attend the conference. It was great to meet many new faces as a result.

As Diamond Sponsors of the conference we were of course present with a booth in the exhibition hall, as well as with three talks.

And while the hotel looked slightly dystopian at night, it was in fact a nice and …

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Exposing MyRocks Internals Via System Variables: Part 7, Use Case Considerations

(In the previous post, Part 6, we covered Replication.)

In this final blog post, we conclude our series of exploring MyRocks by taking a look at use case considerations. After all, having knowledge of how an engine works is really only applicable if you feel like you’re in a good position to use it.

Advantages of MyRocks

Let’s start by talking about some of the advantages of MyRocks.

Compression

MyRocks will typically do a good job of reducing the physical footprint of your data. As I mentioned in my previous post in this series about compression, you have the ability to configure compression down to the individual compaction layers for each column family. You also get the advantage of the fact that data isn’t updated once it’s written to disk. Compaction, which was …

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