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Displaying posts with tag: innodb (reset)
Innotop – A Monitoring tool for MySQL

Monitoring MySQL server has never been an easy task. Monitoring also needs to go through many Complex and difficult queries to get the details.

All these problems can be overcome by an excellent command line monitoring tool  called “Innotop”. Innotop comes with many features and different types of modes/options, which helps to monitor different aspects of MySQL  (InnoDB) performance and also helps database administrator to find out what’s wrong going with MySQL server. Innotop helps in monitoring user statistics, mysql replication status,query list, InnoDB I/O informations etc. Another important thing about innotop is it refreshes the data continuously , so we can view realtime statistics.

Innotop is one of the designed based on top utility for linux.

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MySQL Support Engineer's Chronicles, Issue #9

My previous post from this series was published more than 1.5 years ago. I had never planned to stop writing about my everyday work on a regular basis, but sometimes it's not easy to pick up something really interesting for wider MySQL audience and when in doubts I always prefer to write about MySQL bugs...

In any case, any long way starts from the first step, so I decided to write one post in this series per week and try to summarize in it whatever findings, questions, discussions, bugs and links I've collected over the week. My work experience differs week after week, so some of these posts may be boring or less useful, but I still want to try to create them on a regular basis.

I was working on (upcoming) blog post (inspired by one customer issue) on …

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HotBackup For MyRocks(Rocksdb) using Percona Xtrabackup

Xtrabackup now supports Hotbackup for Myrocks!! yes you heard me right, this is one of the most awaited features with xtrabackup. With the latest release of percona xtrabackup 8.0.6 this is enabled and is supported only for Percona Server version 8.0.15-6 or higher, you can see detailed released notes here.

Myrocks is getting much of the attention now because of its much improved write capabilities and compression. We have also planned to have detailed blog on Myrocks features and limitations.

We shall proceed to test the backup and restore of Myrocks


OS : Debian GNU/Linux 9 …
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MySQL InnoDB Sorted Index Builds

It’s not essential to understand how MySQL® and Percona Server for MySQL build indexes. However, if you have an understanding of the processing, it could help when you want to reserve an appropriate amount of space for data inserts. From MySQL 5.7, developers changed the way they built secondary indexes for InnoDB, applying a bottom-up rather than the top-down approach used in earlier releases. In this post, I’ll walk through an example to show how an InnoDB index is built. At the end, I’ll explain how you can use this understanding to set an appropriate value for innodb_fill_factor.

Index building process

To build an index on a table with existing data, there are the following phases in InnoDB

  1. Read phase (read from clustered index and build secondary index entries)
  2. Merge sort phase
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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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MySQL 8.0 Architecture and Enhancement Webinar: Q & A

In this blog, I will provide answers to the Q & A for the MySQL 8.0 Architecture and Enhancement webinar.

First, I want to thank everybody for attending my April 9, 2019, webinar. The recording and slides are available here. Below is the list of your questions that I was unable to answer fully during the webinar.

Q: What kind of Encryption levels does MySQL 8.0 provide?

The MySQL data-at-rest encryption feature supports the Advanced Encryption Standard (AES) block-based encryption algorithm and aes_256_cbc encryption algorithm for data at rest is hard coded.

Q: At what frequency does the redo log buffer flush the changes to disk? When is the commit variable set to zero?

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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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