The MySQL Development team is very happy to announce that MySQL 8.0.22 is now available for download at dev.mysql.com. In addition to bug fixes there are a few new features added in this release. Please download 8.0.22 from dev.mysql.com or from the MySQL Yum, APT, or SUSE repositories.…
Category Archives: MySQL
InnoDB Data Locking – Part 2 “Locks”
In InnoDB Data Locking – Part 1 “Introduction” we’ve described the difficulties Lock System tries to solve using metaphor of people trying to concurrently edit spreadsheets. While it might be useful metaphor to get some intuitions about the problem, to talk about solutions it helps to know at least a little about the “reality” this metaphor maps to.…
Auditing Selection of Classified Data Stored in MySQL 8.0
The Challenge
Often with sensitive information, you need to have an audit log. Not just that a table had a select run, but that specific cells within the table were accessed. Frequently data such as this will contain a classification level as part of the row, defining policies for how it is handled, audited, etc.
… InnoDB Data Locking – Part 1 “Introduction”
In this blog series, I’d like to introduce you gently to the topic on which I was working last 2 years, which is improving how InnoDB locks data (tables and rows) in order to provide illusion to clients that their queries are executed one after another, while in reality there is a lot of concurrency.…
MySQL Shell Dump & Load part 4: Dump Instance & Schemas
MySQL Shell 8.0.21 comes with two utilities which can be used to perform logical dumps of all the schemas from an instance (util.dumpInstance()) or selected schemas (util.dumpSchemas()). These tools offer major performance improvements over the mysqldump utility, some of our benchmarks show a throughput up to 3GB/s!…
New Consistency for Datafile Locations in MySQL 8.0.21
When you create a general tablespace in MySQL 8.0, you can choose the directory where the associated datafile is created.
CREATE TABLESPACE tablespace_name ADD DATAFILE ‘/my/table/space/dir’;
However, that directory must be known to InnoDB. Known directories are defined by the following settings: datadir, innodb_data_home_dir, innodb_undo_directory & innodb_directories.…
Improvements to Undo Truncation in MySQL 8.0.21
Undo Tablespaces can be truncated either implicitly or explicitly in MySQL 8.0. Both methods use the same mechanism. This mechanism could cause periodic stalls on very busy systems while an undo tablespace truncate completes. This problem has been fixed in MySQL 8.0.21.…
MySQL Shell Dump & Load part 3: Load Dump
Introduced in MySQL Shell 8.0.21, the new MySQL Shell Dump and Load utilities has as its main goal to minimize the time needed to create and restore logical dumps of large data sets.
Through heavy parallelization and other techniques, we were able to reduce the time needed for these tasks by an order of magnitude compared to previous dump utilities.…
MySQL Shell Dump & Load part 2: Benchmarks
This second part about the new MySQL Shell Dump & Load utilities aims to demonstrate the performance while also comparing it with various other logical dump and load tools available: mysqldump, mysqlpump & mydumper.
To make the numbers more meaningful, I used several real world production datasets that are available online: stackoverflow.com…
MySQL Shell Dump & Load part 1: Demo!
MySQL Shell 8.0.21 includes some exciting new utilities to create a logical dump and do a logical restore, with a focus on ease of use, performance and integration. In MySQL Shell 8.0.17, we already introduced a multi-threaded CSV import utility util.importTable()…