Error Message:
Error Code: 1215. Cannot add foreign key constraint
Example:
Error Code: 1215. Cannot add foreign key constraint
  Possible Reason: Case 1: MySQL storage engine. MySQL supports several storage engines, comparing features of the different mysql storage engines are given below. Note that only InnoDB storage engine supports foreign key, when you are using different mysql storage engine you may get the error code: 1215 cannot add foreign key constraint.

Case 2: Key does not exist in the parent table. When …

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FOSDEM is once again descending on the ULB in Brussels, and so again will there be a MySQL and Friends Devroom. Tradition calls for a MySQL and Friends Community Dinner, and we certainly aim not to disappoint this year!

Like last year, we’ll be renting the same private space to allow for easy socializing (at ICAB , more detailed directions below).

As such, prepare for an evening of food, drink and jolly conversation rivaling the great feasts of old. Disclaimer: Apart from jolliness, overindulgence on any account can not be blamed on the organizers of this event.

The …

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Most of you know, that it is possible to synchronize MySQL and MariaDB servers using replication. But with the latest releases, it is also possible to use more than just two servers as a multi-master setup.

Most of you know that both MySQL and MariaDB support replication in a hierarchical master-slave-setup, to propagate changes across all connected servers.

But with the latest releases, a slave can have more than one master.

The keyword: Multi-Source replication

It is supported from MySQL 5.7 and MariaDB 10.0 on, and this article describes how to set it up.

What does Multi-Source mean?

Multi-Source means, that you can take two or more masters and replicate them to one slave, where their changes will be merged. This works just like the regular MySQL/MariaDB …

Transport Layer Security (TLS, also often referred to as SSL) is an important component of a secure MySQL deployment, but the complexities of properly generating the necessary key material and configuring the server dissuaded many users from completing this task.  MySQL Server 5.7 simplifies this task for both Enterprise and Community users. …

In the previous releases of the Group Replication plugin for MySQL we introduced support for several operating systems like Mac OS X, Solaris, and FreeBSD. But why stop there? So here it is, the 0.7.0 version of Group Replication is now also available on Windows!…

We’d like to thank everybody for joining us on January 7th for our “Tired of MySQL Making You Wait?” webinar with Percona’s Alexander Rubin, Principal Consultant and SolarWinds’ Janis Griffin, Database Evangelist.

Too often developers and DBAs struggle to pinpoint the root cause of performance issues and then spend too much time in trying to fix them. In the webinar, we discussed how you can significantly increase the performance of your applications while also reducing database response time.

You can find an archived version of the webinar here.

Below are the questions that were asked during the webinar, with responses from Alex and Janis. If you need further clarification, please respond in the comments.

Thanks again, and we look forward to you joining us at our next webinar (with Percona CEO Peter …

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Error Message:

Error Code: 1062. Duplicate entry ‘%s’ for key %d

Example:
Error Code: 1062. Duplicate entry ‘1’ for key ‘PRIMARY’

Possible Reason:
Case 1: Duplicate value.
The data you are trying to insert is already present in the column primary key. The primary key column is unique and it will not accept the duplicate entry.

Case 2: Unique data field.
You are trying to add a column to an existing table which contains data and set it as unique.

Case 3: Data type –upper limit.
The auto_increment field reached its maximum range.