A query plan uses loose index scan if “Using index for group-by” appears in the “Extra” column of the EXPLAIN output. In some plans though, “Using index for group-by (scanning)” appears. What does “(scanning)” mean and how is it different from the regular loose index scan?…
JSON_TABLE – The Best of Both Worlds
One of the new JSON functions in MySQL 8.0 is JSON_TABLE. It is also MySQL’s first table function. That is, the return value is not a scalar value, but a result set. JSON_TABLE will convert (part of) a JSON document into a relational table.…
MySQL Shell 8.0.12 – What’s New?
Pluggable Password Store
This feature which is enabled by default, allows the Shell using an external component “Secret Store”, to persist session passwords in a secure way. Whenever a new session is created while working with the shell in interactive mode, the option to persist the password for the session will be made available.…
Getting Help in MySQL Shell
The MySQL Shell has a collection of commands and APIs that allow performing a variety of tasks on MySQL instances interactively or through scripts.
Although there’s documentation for the JavaScript and Python APIs as well as the User Guide, it comes handy being able to get help about how to use specific elements of the application while working with it, this is what the centralized help system does.…
The MySQL 8.0.12 Maintenance Release is Generally Available
The MySQL Development team is very happy to announce that MySQL 8.0.12, the first 8.0 Maintenance Release, is now available for download at dev.mysql.com. In addition to bug fixes there are a few new features added in this release, most notably the InnoDB instant add column feature. …
MySQL Shell 8.0.12 – storing MySQL passwords securely
MySQL Shell 8.0.12 introduces a new feature which allows users to store and automatically retrieve their MySQL account credentials. This enables them to seamlessly work with various servers without explicitly providing the password for each new connection and create secure unattended scripts which do not need to include plain text passwords.…
MySQL Guide to Ports
There could be from one to over ten ports used within your MySQL ecosystem. It really depends on what you have enabled, which components you are using, how your applications connect, and other characteristics of your environment.
From a security point, these ports need to be opened just wide enough to allow the various components that should communicate to talk while blocking out anything else trying to hack its way in – the goal being to enforce the security principle of “least privilege”. …
MySQL 8.0: Support for BLOBs in TempTable engine
In some cases, the server creates internal temporary tables while processing statements. These tables could be stored in memory or on disk – the first option is preferred but there exist some limitations. One of such restrictions was presence of TEXT or BLOB columns in the table; as in-memory storage engines (MEMORY and TempTable) did not supported these types server had to use the on-disk engine (InnoDB or MyISAM).…
Audit Log’s JSON format logging
Blood, sweat, tears and the JSON format logging is finally supported by the Audit Log plugin. This comes in pair with the feature that allows to read log events, which could be useful for rapid analysis of the audit log trail without the need of accessing the files directly.…
Upgrading to MySQL 8.0 with Spatial Data
The big change from MySQL 5.7 to 8.0 when it comes to spatial data, is the support for multiple spatial reference systems and geographic computations. This means that the SRIDs of geometries actually have meaning and affect computations. In 5.7 and earlier, however, the SRIDs are ignored, and all computations are Cartesian.…