Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

We are five weeks out to the conference! The tutorials and the sessions have been released, and there’s an added bonus – you can now look at all this in a grid view: tutorials, day one and day two. Now that you can visualize what’s being offered, don’t forget to register.

If you want a discount code, feel free to email me at …

Today is my last day in Asia (China and Taiwan), and between the sessions I had the time to code a small proof-of-concept for people that are asking how they could read their writes on all nodes and ensure the read consistency with their last write ?

The usual (and easier) answer to this particular question is to read on the same host you just wrote. But currently MySQL provides you all the elements to force a consistent read across all the nodes of a group.

Since MySQL 5.7.5, we introduced session_track_gtidsand in 5.7.6 we also introduced  GTIDs context to the OK packet (session tracker) (WL#6128 and WL#6972). So we can use this implementation in …

Recently I wrote a blog post on how to use ProxySQL with 8.0.2 dmr

This blog post was related to the change we implemented in the Group Replication’s monitoring (performance_schema tables) and how sys schema should be changed to modify the view used by ProxySQL according.

However, I used my labs machines that I was using for different purposes too and some changes I made hid a problem that avoid ProxySQL to work with the new defaults in MySQL 8.0.2. Thank you Andy for discovering this.

In fact the new collation default (utf8mb4_0900_ai_ci) is not yet supported by ProxySQL …

Recently, we have implemented a set of new commands in ProxySQL Tools to manage MySQL users. You can create, delete, and modify users from the command line. Following commands are available: [crayon-5cbe24b510204552116729/] You can set a user’s password at the time of creation with —-password option, or later on with the set_password sub-command. Create user Let’s add a […]

The post MySQL Users Management Using ProxySQL Tools appeared first on TwinDB.

As you may know by now, MySQL 8.0.2 DMR is out ! \o/

Many features have been added (see Geir Høydalsvik‘s announcement) and of course the replication also brought new features and improvements (see this post from Luís Soares).

But some improvements in the monitoring broke the added sys view used by ProxySQL to monitor the state of a member of the group:

mysql> select * from sys.gr_member_routing_candidate_status;
+------------------+-----------+---------------------+----------------------+
| viable_candidate | read_only | transactions_behind | transactions_to_cert | …

“Spark and Ignite can complement each other very well. Ignite can provide shared storage for Spark so state can be passed from one Spark application or job to another. Ignite can also be used to provide distributed SQL with indexing that accelerates Spark SQL by up to 1,000x.”–Nikita Ivanov.

I have interviewed Nikita Ivanov,CTO of GridGain.
Main topics of the interview are Apache Ignite, Apache Spark and MySQL, and how well they perform on big data analytics.

RVZ

Q1. What are the main technical challenges of SaaS development projects?

Nikita Ivanov: SaaS requires that the applications be highly responsive, reliable and web-scale. SaaS development projects face many of the same challenges as …

In this blog post, I’ll look at how ProxySQL Admin behaves in some unusual and unexpected ways from a MySQL perspective.

ProxySQL allows you to connect to its admin interface using the MySQL protocol and use familiar tools, like the MySQL command line client, to manage its configuration as a set of configuration tables. This ability may trick you into thinking that you’re working with a stripped-down MySQL server – and expect it to behave like MySQL. 

It would be a mistake to think this! In fact, ProxySQL embeds the SQLite database to store its configuration. As such, it behaves much closer to SQLite!

Below, I’ll show you a few things that confused me at first. All of these are as of ProxySQL 1.3.6 (in case behavior changes in the future).

Fake support for Use command

Percona announces the release of Percona XtraDB Cluster 5.7.18-29.20 on June 2, 2017. Binaries are available from the downloads section or our software repositories.

NOTE: You can also run Docker containers from the images in the Docker Hub repository.

NOTE: Due to new package dependency, Ubuntu/Debian users should use apt-get dist-upgrade or apt-get installpercona-xtradb-cluster-57 to upgrade.

Percona XtraDB Cluster …

Percona announces the release of Percona XtraDB Cluster 5.6.36-26.20 on June 2, 2017. Binaries are available from the downloads section or our software repositories.

Percona XtraDB Cluster 5.6.36-26.20 is now the current release, based on the following:

• Percona Server 5.6.36-82.0
• Galera Replication library 3.20
• wsrep API version 26

All Percona software is open-source and free.

…

In this blog post, we’ll look at how Percona XtraDB Cluster maintenance mode uses ProxySQL to take cluster nodes offline without impacting workloads.

Percona XtraDB Cluster Maintenance Mode

Since Percona XtraDB Cluster offers a high availability solution, it must consider a data flow where a cluster node gets taken down for maintenance (through isolation from a cluster or complete shutdown).

Percona XtraDB Cluster facilitated this by introducing a maintenance mode. Percona XtraDB Cluster maintenance mode reduces the number of abrupt workload failures if a node is taken down using ProxySQL (as a load balancer).

The central idea is delaying the core node action …