I’m pleased to announce that VividCortex now offers 99th percentile metrics to help understand latency outliers in a query workload. These metrics provide visibility beyond the average latency, help identify the worst outliers, and improve focus on the customer experience. They are offered for all of the databases we currently support when using On-Host monitoring.

What You'll See

Latency percentile metrics are one of our most popular feature requests, so we know this will make a lot of you very happy! We actually started collecting these metrics some time ago; you’ll have p99 latency metrics for the last couple of months if you look back at your historical metrics. These metrics are captured globally for an environment, per-query, per-database, per-user, per-verb, per-caller and per-custom-query-tag.

Why Did We Choose to Implement This? 

It is extremely useful for a lot of reasons. Averages can be …

MySQL 8.0 comes with improved defaults, aiming at the best out of the box experience possible. Here we describe the changes and why they are made.

Introduction

Generally speaking, a good default is “the best choice for most users, most of the time”.…

In our last blog, we had a look at MySQL 8 and mentioned new features available here. However, some of those features are already in MariaDB and have been for a while. We will here compare database roles in both server dialects.

The Purpose of Database Roles

It’s common for numerous users within an organization to share the same database privileges. A role bundles a number of privileges together so that the DBA can set the privileges for a group of users all at once, rather than having to set each user’s privileges individually.  

With shared applications, it is not uncommon for multiple users to share the same user account. The drawback to this arrangement is that there is no way to see which actual user was responsible for which action.

Roles make managing this much easier. For example, there …

In this article, 1st of a MySQL 5.7 Security series, we will see how to enforce Strong Passwords with Password Validation Plugin when using MySQL 5.7.

Authentication with ID and password is a very simple and common (because it’s simple) way to secure the access to a resource, however the password can be the weak point of this system. In order to increase the security level, you can required that your user passwords meet certain minimal security requirements, using the MySQL Password validation plugin!

MySQL 8.0 will be GA soon (just my assumption: Oracle doesn't tell me anything about its release plans) and it's time to think about having a look at it.
If this is your first try of MySQL 8, get prepared for several impacting differences from previous versions.

In this article I won't tell you what you can do with MySQL 8: there is plenty of material about this, including in this very blog. I will instead concentrate on differences from previous versions that users need to know if they want to avoid surprises.

Data Directory

Let's start with an observation of the data directory.
After a standard installation, without any additional options, I see the following:

Files that I expected to see

auto.cnf
ib_buffer_pool
ib_logfile0
ib_logfile1
ibdata1
ibtmp1
(dir) mysql
(dir) …

 Last_SQL_Error: Could not execute <Update/insert/delete>_rows event on table <dbname>.<tablename>; Can’t find record in ‘<tablename>’, Error_code: 1032; handler error HA_ERR_END_OF_FILE; the event’s master log <master binary log file name>, end_log_pos <master log file position>

This is one of the error for MySQL Replication when MASTER and SLAVE replica not in sync. The Reason for replication getting out of sync due to various reasons. But the common cause is particular table row or data not matched/missing on the slave while applying transaction received from MASTER. This transaction can be insert/update/delete type.

In this blog post will discuss support for MEMORY storage engine table with MySQL Replication and few examples with a possible solution. As per official MySQL DOC, …

Please join Percona’s Principal Support Engineer, Sveta Smirnova, as she presents Performance Schema for MySQL Troubleshooting on Thursday, March 1, 2018, at 10:00 am PST (UTC-8) / 1:00 pm EST (UTC-5).

Register Now

Performance Schema, first introduced in version 5.5, is a really powerful tool. It is actively under development, and each new version provides even more instruments for database administrators.

Performance Schema is complicated. It is also not free: it can slow down performance if you enable certain …

In this blog post, we’ll checkout Percona Monitoring and Management vs. gnuplot when it comes to creating great metrics graphs. gnuplot is great, but PMM might provide graphs that are easier to read.

Percona Monitoring and Management (PMM) is our free and open-source platform for managing and monitoring MySQL®, MariaDB® and MongoDB® performance, and is based on Grafana and Prometheus. It collects many kinds of metrics: OS metrics, MySQL metrics or MongoDB metrics. But there are times where you just ran a benchmark or collected your specific metrics and you want to visualize them.

For a long time, I used gnuplot for that (and I still like it). But when I was working on a recent blog post, one of my colleagues wrote me: …

In this blog post, I’ll look at how you can analyze raw MySQL query logs with ClickHouse.

For typical query performance analyses, we have an excellent tool in Percona Monitoring and Management. You may want to go deeper, though. You might be longing for the ability to query raw MySQL “slow” query logs with SQL.

There are a number of tools to load the MySQL slow query logs to a variety of data stores. For example, you can find posts showing how to do it with LogStash. While very flexible, these solutions always look too complicated and limited in functionality to me.   

By far the best solution to parse and load MySQL slow query logs (among multiple log types supported) is Charity …

Publishing a book internationally turned out to be a bit more complex than I
originally thought. Therefore there are three different ways to order the book
MySQL Cluster 7.5 inside and out.

The E-book which is now available world-wide.
The paperback version. This is also now available world-wide.
Finally the bound version which is available from Nordic countries
and Germany and Switzerland.

The original idea was to publish it as an E-book and as a bound book.
Given that the book is 640 pages long I felt that I wanted a bound book
to ensure that I can read the book a lot. I've got a few copies of the bound
book at home and I have it on my desk all the time together with Jesper
and Mikiyas Pro MySQL NDB Cluster book.

As it turned out the printer only had international agreements to
print paperback books with figures in black and white …