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 …

Where the hell is it?

The MySQL shell is a potentially useful tool that has been intentionally made difficult to use properly.

It was introduced, with much fanfare, with the MySQL Document Store, as THE tool to bridge the SQL and no-SQL worlds. The release was less than satisfactory, though: MySQL 5.7.12 introduced a new feature (the X-protocol plugin) bundled with the server. The maturity of the plugin was unclear, as it popped out of the unknown into a GA release, without any public testing. It was allegedly GA quality, although the quantity of bug reports that were filed soon after the release proved otherwise. The maturity of the shell was known as "development preview", and so we had a supposedly GA feature that could only be used with an alpha …

The latest release of Percona Monitoring and Management (PMM) 1.8.0 is available as of February 27, 2018.

Percona Monitoring and Management is a free and open-source platform for managing and monitoring MySQL and MongoDB performance. You can run PMM in your own environment for maximum security and reliability. It provides thorough time-based analysis for MySQL and MongoDB servers to ensure that your data works as efficiently as possible.

This release introduces many improvements in the user interface and optimizations of performance.

New landing page

The home page has been removed in favor of the …

Today the call for participation for Oracle Open World 2018 has started.

The 2018’s edition will take place in San Francisco as usual, from October 22nd to 25th.

As every year, MySQL will be present and if you want to participate, we encourage you to submit a session. We encourage the submission on the following topics:

• case studies / user stories of your use of MySQL
• lessons learned in running web scale MySQL
• Production DBA/DevOps perspectives into Architecture, Performance, Replication, InnoDB, Security, etc

The call for paper is open until March 22nd, don’t miss the chance to be part …

In this blog post,  I’ll look at how to catch slow and frequent queries with ProxySQL.

More and more people are using ProxySQL because it is a great tool and it can help DBAs a lot. But many people do not realize that it is more powerful than it looks. It has many features and possibilities. I am going to show you one of my favorite “tricks” / use cases.

There are plenty of blog posts explaining how ProxySQL works. I am not going to that again. Instead, let’s jump straight to the point. There is a table in ProxySQL called “stats.stats_mysql_query_digest”. It is one of my favorite tables because it basically records all the queries that were running against ProxySQL. Without collecting any queries on the MySQL server, I can find …

As for each previous version, to upgrade to MySQL 8.0 you must first read the upgrade section in the manual. It’s important to know that you should upgrade without skipping a major version, so upgrade from 5.6 to 8.0 is not supported neither recommended.

Please also note that upgrades from any MySQL 8.0 RC won’t work. We support upgrade process only from GA versions.

Then one of the most important section to be aware of, is the incompatibility changes brought with the new version.

Once you have read the upgrade section in the manual and the release note of the version you want to install, with MySQL 8.0 and its new MySQL Shell, we developed …

Buying software solutions for your company is a skill just like any other business practice. To be effective at purchasing it is necessary to have a clear understanding of what you require and a plan on how to evaluate potential vendors. When time is also a factor a working knowledge of the internal buying processes and expectations of your employer are also important.

The wide variety of similar sounding products with hard to distinguish feature differentiators can be daunting. In order to get the right software at a competitive price within the desired timeframe there are 4 important things to consider.

Here’s the short list:

• Define requirements by focusing on needs instead of features
• Prepare your budget, know your buying process
• Check provider quality and support
• Make the most of your trial period

And here’s the longer one: …