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Displaying posts with tag: Miguel Angel Nieto (reset)

max_allowed_packet and binary log corruption in MySQL
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The combination of max_allowed_packet variable and replication in MySQL is a common source of headaches. In a nutshell, max_allowed_packet is the maximum size of a MySQL network protocol packet that the server can create or read. It has a default value of 1MB (<= 5.6.5) or 4MB (>= 5.6.6) and a maximum size of 1GB. This adds some constraints in our replication environment:

  • The master server shouldn’t write events to the binary log larger than max_allowed_packet
  • All the slaves in the replication chain should have the same max_allowed_packet as the master server

Sometimes, even following those two basic rules we can have problems.

For example, there are situations (also called

  [Read more...]
How to add an existing Percona XtraDB Cluster to Percona ClusterControl
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In my last blog post I explained how to use Percona ClusterControl to create a new Percona XtraDB Cluster from scratch. That’s a good option when you want to create a testing environment in just some mouse clicks. In this case I’m going to show you how to add your existing cluster to Percona ClusterControl so you can manage and monitor it on the web interface.

The environment will be pretty similar, we will have UI, CMON and 3 XtraDB Cluster nodes. The cluster should be already running and Percona ClusterControl also installed.

Adding an existing Cluster

The

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How to recover table structure from .frm files with MySQL Utilities
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Table structures are stored in .frm files and in the InnoDB Data Dictionary. Sometimes, usually in data recovery issues, we need to recover those structures to be able to find the lost data or just to recreate the tables.

There are different ways to do it and we’ve already written about it in this blog. For example, we can use the data recovery tools to recover table structures from InnoDB Dictionary or from the .frm files using a MySQL Server. This blog post will be an update of that last one. I will show you how to easily recover the

  [Read more...]
MySQL 5.7 multi-source replication
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Recently Oracle announced several new features for the latest available development version of MySQL that is 5.7.2 at the time of writing this article. Most of them are performance and replication related that show us how incredible the new release will be.

In this post I’m going to try to explain in some easy steps how the new multi-source replication works and how we can configure it for our own tests. It is important to mention that this is a development release, so it is not production ready. Therefore this post is intend to people that want to test the new feature and see how it works with their application, always in a staging environment.

What is multi-source replication?

First, we need to have clear that multi-master and multi-source replication are not the same. Multi-Master replication is the usual

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Why is the ibdata1 file continuously growing in MySQL?
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We receive this question about the ibdata1 file in MySQL very often in Percona Support.

The panic starts when the monitoring server sends an alert about the storage of the MySQL server – saying that the disk is about to get filled.

After some research you realize that most of the disk space is used by the InnoDB’s shared tablespace ibdata1. You have innodb_file_per_table enabled, so the question is:

What is stored in  [Read more...]

Showing entries 1 to 5

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