As of MySQL 8.0, performance_schema.data_locks shows InnoDB data locks. Before MySQL 8.0, you must SET GLOBAL innodb_status_output_locks=ON and ruminate on the output of SHOW ENGINE INNODB STATUS. The image below (click to see full size) shows how the former maps to the latter for three record locks and one table lock on table t.

Information Schema tables INNODB_LOCKS and INNODB_LOCK_WAITS are deprecated as of MySQL 5.7 and removed as of MySQL 8.0. They are better than nothing, but “Persistence and Consistency of InnoDB …

As of MySQL 8.0, performance_schema.data_locks shows InnoDB data locks. Before MySQL 8.0, you must SET GLOBAL innodb_status_output_locks=ON and ruminate on the output of SHOW ENGINE INNODB STATUS. The image below (click to see full size) shows how the former maps to the latter for three record locks and one table lock on table t. Information Schema tables INNODB_LOCKS and INNODB_LOCK_WAITS are deprecated as of MySQL 5.7 and removed as of MySQL 8.

MySQL 8.0.26 has been released last week !

As usual, it’s highly advised to read the release notes to get informed about the changes and bug fixed.

MySQL is Open Source and each release contains contributions from our great Community. Let me thanks all the contributors on behalf of the entire MySQL Team: Thank you !

MySQL 8.0.26 includes contributions from Venkatesh Prasad Venugopal, Zhai Weixiang, Miron Balcerzak, Marc Fletcher, Zheng Lai, Huqing Yan, Lee William, Brian Yue, Marcus Ekström, Adam, Cable, Garen Chan, Xiaoyu Wang, Marcelo Altmann and Facebook.

Once again, thank you all for your great contributions.

Here is the list of the above contributions and related bugs:

Replication …

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When I wrote the book MySQL Concurrency I included a Python module for MySQL Shell that would help reproducing the examples in the book. Since things change, it has been necessary to update the code. In this blog I will explain what the changes are which also give me a chance to say thanks to those that have submitted pull requests.

MySQL Concurrency

Version v1.1 was mostly about correcting the directory structure of the repository which was not as it was meant to be – and different from the instructions in the book. Additionally some files with code listings and images were missing. …

MySQL, an open source database developed by Oracle, powers some of Facebook’s most important workloads. We actively develop new features in MySQL to support our evolving requirements. These features change many different areas of MySQL, including client connectors, storage engine, optimizer, and replication. Each new major version of MySQL requires significant time and effort to migrate our workloads. The challenges  include:

• Porting our custom features to the new version
• Ensuring replication is compatible between the major versions
• Minimizing changes needed for existing application queries
• Fixing performance regressions that prevent the server from supporting our workloads

Our last major version upgrade, to MySQL 5.6, took more than a year to roll out. When version 5.7 was released, we were still in the …

With MySQL 8.0, the version of MySQL Database Service aka MDS, the default character set has changed from latin1 to ut8mb4. The default collation is utf8mb4_0900_ai_ci but what does that mean ? and why are the utf8mb4_0900_* the recommended ones ?

Collations like utf8mb4_unicode_520_ci and utf8mb4_0900_ai_ci are based on Unicode Collation Algorithm (UCA). The number in the collation defines the UCA version:

• UCA 9.0.0 (recommended)
  - example: utf8mb4_0900_ai_ci
• UCA 5.2.0 (not recommended, see problems below)
  - example: utf8mb4_unicode_520_ci

The …

With MySQL 8.0, the version of MySQL Database Service aka MDS, the default character set has changed from latin1 to ut8mb4. The default collation is utf8mb4_0900_ai_ci but what does that mean ? and why are the utf8mb4_0900_* the recommended ones ? Collations like utf8mb4_unicode_520_ci and utf8mb4_0...

MySQL Server 8.0.26 and 5.7.35, new versions of the popular Open Source Database Management System, have been released in conjunction with the 8.0.26 Connector and Component products. 

We are also pleased to announce the release of MySQL Cluster 8.0.26, the latest GA, along with 7.6.19, 7.5.23, 7.4.33. MySQL Cluster is the distributed, shared-nothing variant of MySQL. 

These releases are recommended for use on production systems and are available in source and binary form for a number of platforms from our MySQL Community download pages at:

https://dev.mysql.com/downloads/

Windows packages are available via the Installer for Windows or .ZIP (no-install) packages for more advanced needs. The point and click configuration wizards and all MySQL products are …

MySQL Server 8.0.26 and 5.7.35, new versions of the popular Open Source Database Management System, have been released in conjunction with the 8.0.26 Connector and Component products. We are also pleased to announce the release of MySQL Cluster 8.0.26, the latest GA, along with 7.6.19, 7.5.23, 7.4.3...

    Pandas is a Python software library for data analysis and manipulation.  It allows you to import data from CSV files, SQL, and Excel.  And it is open source.

    Pandas works well with the MySQL Shell.  After installing Pandas with pip install pandas on my Fedora test system, I was able to load Pandas.  The documentation is excellent at pandas.pydata.org   and I was quickly able to get one of their examples working from within mysqlsh.

Did I mention SQL as a source of data? Reading from MySQL is very easy.  

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