Filesort optimization in 5.7.3: pack values in the sort buffer
In MySQL, filesort is the catch-all algorithm for producing sorted results for ORDER-BY or GROUP-BY queries. MySQL has two algorithms for filesort, both the original and the modified algorithms are...
View ArticleHow to Easily Identify Tables With Temporal Types in Old Format!
The MySQL 5.6.4 release introduced support for fractional values within the temporal datatypes: TIME, DATETIME, and TIMESTAMP. Hence the storage requirement and encoding differs for them in comparison...
View ArticleMySQL 5.7 — Native Systemd Support
Introduction Systemd is a management and configuration platform available in all major Linux distributions. It provides infrastructure for service start, stop, restart and several other novel...
View ArticleIdentifying Insecure Connections
A key theme of the MySQL Server 5.7 release is much improved security. Earlier releases of MySQL 5.7 have introduced features supporting this initiative including automatic generation and detection of...
View ArticleProtecting MySQL Passwords With the sha256_password Plugin
Over the years, MySQL has used three different mechanisms for securing passwords both for storage and for transmission across networks. This blog post aims to provide a brief history of the various...
View ArticleAdd RSS feeds to your Twitter stream using MySQL and Perl
Adding good content to Twitter can be a pain. I can’t do it during working hours, and I don’t have much time at night. But, the more content you have, the more followers you can gain, and the more your...
View ArticleImprovements to XA Support in MySQL 5.7
Introduction XA stands for “eXtended Architecture”, and is a standard created by The Open Group for distributed transaction processing. While MySQL 5.0 was the first version to support XA, MySQL 5.7...
View ArticleMySQL with Docker – Performance characteristics
Docker presents new levels of portability and ease of use when it comes to deploying systems. We have for some time now released Dockerfiles and scripts for MySQL products, and are not surprised by it...
View ArticleMySQL 8.0: Testing Improvements
The first DMR of MySQL 8 was recently released. While a DMR (or Developer Milestone Release) is not yet a GA product, it does come with our commitment that each feature has been tested and qualified...
View ArticleClik here to view.
Supporting all kinds of outer references in derived tables (lateral, or not)
(Image credit: Pixabay). In my earlier post, I showed how MySQL, since version 8.0.14, has support for LATERAL derived tables. With LATERAL, a JOIN can have a second table – a subquery-based derived...
View Article