Percona is glad to announce the release of Percona XtraDB Cluster 5.7.26-31.37 on June 26, 2019. Binaries are available from the downloads section or from our software repositories.
Percona XtraDB Cluster 5.7.26-31.37 is now the current release, based on the following:
All Percona software is open-source and free.
Bugs Fixed
Percona is glad to announce the release of Percona XtraDB Cluster 5.6.44-28.34 on June 19, 2019. Binaries are available from the downloads section or from our software repositories.
Percona XtraDB Cluster 5.6.44-28.34 is now the current release, based on the following:
All Percona software is open-source and free.
Bugs Fixed
Recently, I received a support request where the customer wanted to convert an INTEGER column to BIGINT on two tables. These tables are related by a foreign key, and it is a 3 node PXC cluster. These tables are 20GB and 82 GB in size and DDL’s on such tables in a production environment is always a challenge. We have options like direct ALTER or using pt-online-schema-change to get this done, but this is a very special case where none of them will be able to do this DDL. To demonstrate why this is so, please follow the table schema and the example below about DDL queries on foreign key columns. In the end, I will discuss an easy workaround, too.
Please take a look at table schema before reading further. In the below schema, the product_catalog_id column from the product_details table refers to catalog_id column from the product_catalog table. Both these fields are INT(11) …
[Read more]Redhat Enterprise Linux 8 packages have been released into our repositories. Recent versions of Percona Server for MySQL, Percona XtraDB Cluster, Percona XtraBackup, Percona Server for MongoDB, Percona Toolkit, and the PMM Client can now be automatically installed via Redhats dnf utility.
How to install RHEL 8
Visit https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux and follow the instructions. If you have a paid subscription, you will be able to download the RHEL 8 DVD ISO and use this to install the operating system on a physical or virtual machine. You may also signup for a free 30-day trial.
Once installed, you will need to register the instance with Redhat using subscription-manager in order to update your instance. While logged in …
[Read more]We are pleased to announce the release of PMM 2 Beta! PMM (Percona Monitoring and Management) is a free and open-source platform for managing and monitoring MySQL, MongoDB, and PostgreSQL performance.
ProxySQL 2.0.4, released by ProxySQL, is now available for download in the Percona Repository along with Percona’s proxysql-admin tool.
ProxySQL is a high-performance proxy, currently for MySQL and database servers in the MySQL ecosystem (like Percona Server for MySQL and MariaDB). It acts as an intermediary for client requests seeking resources from the database. René Cannaò created ProxySQL for DBAs as a means of solving complex replication topology issues.
This release includes ProxySQL 2.0.4 which fixes many bugs and introduces a number of features …
[Read more]Percona announces the release of Percona Server for MySQL 5.7.26-29 on May 27, 2019 (downloads are available here and from the Percona Software Repositories). This release merges changes of MySQL 5.7.26, including all the bug fixes in it. Percona Server for MySQL 5.7.26-29 is now the current GA release in the 5.7 series. All of Percona’s software is open-source and free.
New Features:
“Hey, what’s going on with my applications? I installed a newer version of MySQL. I have queries that perfectly run with the older version and now I have a lot of errors.”
This is a question some customers have asked me after upgrading MySQL. In this article, we’ll see what one of the most frequent causes of this issue is, and how to solve it.
We are talking about this error:
ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.web_log.user_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
Have you ever seen it?
SQL_MODE
As the first thing let me introduce the concept of SQL_MODE.
MySQL can work using different SQL modes that affect the syntax of the queries and validation checks. Based on the configured value of the …
[Read more]Percona is glad to announce the release of Percona XtraBackup 8.0.6 on May 9, 2019. You can download it from our download site and apt and yum repositories.
Percona XtraBackup enables MySQL backups without blocking user queries, making it ideal for companies with large data sets and mission-critical applications that cannot tolerate long periods of downtime. Offered free as an open source solution, it …
[Read more]In my previous post Running MySQL/Percona Server in Kubernetes with a Custom Config I’ve looked at how to set up MySQL in Kubernetes to utilize system resources fully. Today I want to measure if there is any performance overhead of running MySQL in Kubernetes, and show what challenges I faced trying to measure it.
I will use a very simple CPU bound benchmark to measure MySQL performance in OLTP read-only workload:
sysbench oltp_read_only --report-interval=1 --time=1800 --threads=56 --tables=10 --table-size=10000000 --mysql-user=sbtest --mysql-password=sbtest --mysql-socket=/var/lib/mysql/mysql.sock run
The hardware is as follows:
Supermicro server
