The latest from the MySQL community

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Overview

I love ProxySQL, I think it is a great component for expanding architecture flexibility and HA, but not all what shine is gold.

Let me make clear that I only want to set the expectations right, and avoid to sell carbon for gold. Carbon has it's own use, gold has another. 

First of all let me clarify what is mirroring for me (and hope most of you).

Then we need to cover the basic of how ProxySQL manage the (I cannot say mirroring) traffic dispatch.

ProxySQL receive a connection from the application, and through it we can have a simple SELECT or a more complex transaction. ProxySQL will get each query, pass it to the QueryProcessor, process the query, identify if the query is mirrored, duplicate the whole mysql session ProxySQL …

Percona announces the GA release of Percona Server for MySQL 5.7.18-14 on May 12, 2017. Download the latest version from the Percona web site or the Percona Software Repositories. You can also run Docker containers from the images in the Docker Hub repository.

Based on MySQL 5.7.18, including all the bug fixes in it, Percona Server for MySQL 5.7.18-14 is the current GA release in the Percona Server for MySQL 5.7 series. Percona’s …

Percona announces the release of Percona Server for MySQL 5.6.36-82.0 on May 12, 2017. Download the latest version from the Percona web site or the Percona Software Repositories. You can also run Docker containers from the images in the Docker Hub repository.

Based on MySQL 5.6.36, and including all the bug fixes in it, …

In this post I will explain how to transfer a multi terabyte size database between two MySQL instances using mydumper, which is a logical backup and restore tool that works in parallel. I will also cover the case where you need to transfer only a subset of data.

Big tables are often problematic because of the amount of time needed to do mysqldump/restore which is single threaded. It is not uncommon for this type of process to take several days.

From MySQL 5.6 and on, we also have transportable tablespaces, but there are some limitations with that approach.

Physical backups (e.g. xtrabackup) have the advantage to be faster, but there are some scenarios where you still need/want a logical backup (e.g migrating to RDS/Aurora/Google Cloud SQL).

Steps Install mydumper/myloader

The first thing …

New MariaDB/MySQL storage engines such as MyRocks and TokuDB have renewed interest in using engines other than InnoDB. This is great, but also presents new challenges. In this article, I will describe work that I am currently finishing, and which addresses one such challenge.

For example, the left bar in the figure shows what happens to MyRocks replication performance when used with a default install where the replication state table uses InnoDB. The middle bar shows the performance improvement from my patch.

Current MariaDB and MySQL replication uses tables to transactionally record the replication state (eg mysql.gtid_slave_pos). When non-InnoDB storage engines are introduced the question becomes: What engine should be used for the replication table? Any choice will penalise other engines heavily by injecting a cross-engine transaction with every replicated change. Unless all tables can be migrated to the …

In the first part of this series you learned how to setup an InnoDB cluster using Oracle Cloud. In this second part, you are going to learn how and when to use some of the advanced functions available in MySQL Shell.…

via GIPHY I was just responding to some Disqus comments on a recent blog post. Admittedly it had a provocative title Will SQL databases just die already. What do you think? Join 34,000 others and follow Sean Hull on twitter @hullsean. A reader pointed out that some No-SQL databases do support joins. Huh? My face … Continue reading A roughneck walk down database alley →

In this blog post, we’ll look at MyRocks and the

LOCK IN SHARE MODE

.

Those who attended the March 30th webinar “MyRocks Troubleshooting” might remember our discussion with Yoshinori on 

LOCK IN SHARE MODE

.

I did more tests, and I can confirm that his words are true:

LOCK IN SHARE MODE

 works in MyRocks.

This quick example demonstrates this. The initial setup:

CREATE TABLE t (
id int(11) NOT NULL,
f varchar(100) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=ROCKSDB;
insert into t values(12345, 'value1'), (54321, 'value2');

In session 1: …

We’re constantly working to improve packaging and distribution of MySQL products. We have official Docker images for MySQL Server and we use Docker images to provide easy to use previews of upcoming and experimental setups and features in our products. Today we’re dockerizing another major product by releasing preview Docker images for MySQL Cluster. In […]

Preparing the MySQL Enterprise Administrator Training I found that the MySQL Enterprise Backup Incremental Backup is not described very well. Thus I tried it out and wrote down this how-to:

Incremental Differential Backup

Full Backup

mysqlbackup --user=root --backup-dir=/tape/full backup-and-apply-log
grep end_lsn /tape/full/meta/backup_variables.txt
end_lsn=2583666

Incremental Backups

mysqlbackup --user=root --incremental-backup-dir=/tape/inc1 --start-lsn=2583666 --incremental backup
grep end_lsn /tape/inc1/meta/backup_variables.txt
end_lsn=2586138

mysqlbackup --user=root --incremental-backup-dir=/tape/inc2 --start-lsn=2586138 --incremental backup
grep end_lsn /tape/inc2/meta/backup_variables.txt
end_lsn=2589328

mysqlbackup --user=root --incremental-backup-dir=/tape/inc3 --start-lsn=2589328 --incremental backup
grep end_lsn …