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In MySQL NDB Cluster, the management node (ndb_mgmd) is a lightweight process that among other things handles the configuration of the cluster. Since it is lightweight. It can be tempting to install it with one of the other nodes. However, if you want a high-availability setup, you should never install it on the same host as a data node (ndbd or ndbmtd). If you do that, it can cause a total cluster outage where the cluster could otherwise have survived.

The first sign of trouble occurs when you start the management nodes. The following warning is printed to standard output:

2018-08-22 18:04:14 [MgmtSrvr] WARNING  -- at line 46: Cluster configuration warning: …

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Apress have been kind enough to invite me to write a blog in connection with my recently released book MySQL Connector/Python Revealed. I chose to write an introduction of MySQL Connector/Python including three examples illustrating the APIs and the difference between querying SQL tables and a JSON document store.

You can read the whole post at Apress’ blog.

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ProxySQL is the most preferred and is widely used for load-balancing MySQL workload, thanks to Rene Cannon & Team for the great tool, and kudos on the recent release of ProxySQL 1.4.10, with a lot of bug fixes. ProxySQL is simple in design, lightweight, highly efficient and feature rich, We have been working with ProxySQL in production for our client quite a sometime, we have also shared some of our encounters/experience and use cases in the below blogs.

• ProxySQL for replication – Read Write split
• ProxySQL for handling bad queries
• …

Data protection is one of the most significant aspects of administering a database. Depending on the organizational structure, whether you are a developer, sysadmin or DBA, if you are managing the production database, you must monitor data for unauthorized access and usage. The purpose of security monitoring is twofold. One, to identify unauthorised activity on the database. And two, to check if databases ´and their configurations on a company-wide basis are compliant with security policies and standards.

In this article, we will divide monitoring for security in two categories. One will be related to auditing of MySQL and MariaDB databases activities. The second category will be about monitoring your instances for potential security gaps.

Query and connection policy-based monitoring

Continuous auditing is an imperative task for monitoring your database environment. By auditing your database, you can achieve …

A replication user is necessary to set up the relationship Primary/Replica. This is a short step but it needs a bit more of attention.

From the MySQL 5.7 documentation (highlights are my own):

Although you do not have to create an account specifically for replication, you should be aware that the replication user name and password are stored in plain text in the master info repository file or table (see Section 16.2.4.2, “Slave Status Logs”). Therefore, you may want to create a separate account that has privileges only for the replication process, to minimize the possibility of compromise to other accounts.

The following command specifically will allow replication from all databases and tables connecting from all hosts. For security reasons you may want to limit access to replication only to the IP address of the server doing the …

If you are using large EBS GP2 volumes for MySQL (i.e. 10TB+) on AWS EC2, you can increase performance and save a significant amount of money by moving to local SSD (NVMe) instance storage. Interested? Then read on for a more detailed examination of how to achieve cost-benefits and increase performance from this implementation.

EBS vs Local instance store

We have heard from customers that large EBS GP2 volumes can be affected by short term outages—IO “stalls” where no IO is going in or out for a couple of minutes. Statistically, with so many disks in disk arrays (which back EBS volumes) we can expect frequent disk failures. If we allocate a very large EBS GP2 volume, i.e. 10Tb+, hitting such failure events can be common.

In the case of MySQL/InnoDB, such an IO “stall” will be obvious, particularly with the highly loaded system where MySQL needs to do physical IO. During the stall, you will see all write queries …

Third chapter of "MySQL Cluster 7.5 inside and out".

NDB was designed for a number of networking applications. In particular the original
design focused a lot on telecom applications. The telecom applications have extreme
requirements on availability, many networking applications as well.

This chapter goes through a number of application types where NDB have been used
and also uses a number of public examples of use cases.

These application types include DNS servers, DHCP servers, Intelligent Network (IN)
applications, 3G/4G/5G applications, RADIUS servers, number portability, DIAMETER
server, Video-on-demand applications, Payment Gateways, Software Defined
Networking (SDN), Network Function Virtualization (NFV), Voice over IP.

…

Please join Percona’s Chief Evangelist, Colin Charles on Tuesday, August 21st, 2018, as he presents MariaDB 10.3 vs. MySQL 8.0 at 7:00 AM PDT (UTC-7) / 10:00 PM EDT (UTC-4).

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Are they syntactically similar? Where do these two languages differ? Why would I use one over the other?

MariaDB 10.3 is on the path of gradually diverging from MySQL 8.0. One obvious example is the internal data dictionary currently under development for MySQL 8.0. This is a major change to the way metadata is stored and used within the server: MariaDB doesn’t have an equivalent feature. Implementing this feature could mark the end of datafile-level compatibility between MySQL and MariaDB.

There are also non-technical …

Great information. Since last week, I am gathering details about the MySQL experience. There are some amazing details on your blog which I didn’t know. Thanks.

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Percona announces the release of Percona Server for MySQL 5.6.41-84.1 on August 17, 2018 (downloads are available here and from the Percona Software Repositories). This release merges changes of MySQL 5.6.41, including all the bug fixes in it. Percona Server for MySQL 5.6.41-84.1 is now the current GA release in the 5.6 series. All of Percona’s software is open-source and free.

Bugs Fixed

• A simple SELECT query on a table with CHARSET=euckr COLLATE=euckr_bin could return different results each time it was executed. Bug fixed  …