Is your database restore stuck with MySQL Error 2013 (hy000)?

Often queries or modifications in large databases result in MySQL errors due to server timeout limits.

At Bobcares, we often get requests to fix MySQL errors, as a part of our Server Management Services.

Today, let’s see how our Support Engineers fix MySQL Error 2013 (hy000) for our customers.

Why this MySQL Error 2013 (hy000) happens?

While dealing with MySQL, we may encounter some errors. Today, we are going to discuss one such error.

This MySQL 2013 error occurs during a restore of databases via mysqldump, in MySQL replication, etc.

This error appears when the connection between MySQL client and database server times out.

In general, this happens in databases with large tables. As a result, it takes too much time for the query to return data and the connection drops with an error.

Other reasons for the error include a large number of aborted connections, insufficient server memory, server restrictions, etc.

How do we fix MySQL Error 2013 (hy000)?

The fix for MySQL Error 2013 (hy000) depends a lot on the triggering reason. Let’s now see how our MySQL Engineers help customers solve it.

1. Changing MySQL limits

Recently, one of our customers approached us saying that he is getting an error like the one shown below while he is trying to connect with MySQL server.

So, our Engineers checked in detail and found that the connect_timeout value was set to only a few seconds. So, we increased it to 10 in the MySQL configuration file. For that, we followed the steps below:

Firstly, we opened the MySQL configuration file at /etc/mysql/my.cnf

Then, we searched for connect_timeout and set it as:

connect_timeout=10

Then we tried connecting with MySQL server and we were successful.

Additionally, it requires the proper setting of the variable max_allowed_packet in the MySQL configuration file too. While trying to restore the dump file in GB sizes, we increase the value to a higher one.

2. Disable Access restrictions

Similarly, this error also appears when the host has access restrictions. In such cases, we fix this by adding the client’s IP in /etc/hosts.allow or allow it in the server firewall.

Also, the error can happen due to the unavailability of the server. Recently, in a similar instance, the problem was not related to MySQL server or MySQL settings. We did a deep dig and found that high network traffic is causing the problem.

When we checked we found that a weird process running by the Apache user. So, we killed that and this fixed the error.

3. Increasing Server Memory

Last and not least, MySQL memory allocation also becomes a key factor for the error. Here, the server logs will have related entries showing the insufficient memory limit.

Therefore, our Dedicated Engineers reduce the innodb_buffer_pool size. This reduces the memory allocation on the server and fixes the error.

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Conclusion

In short, we discussed in detail on the causes for MySQL Error 2013 (hy000) and saw how our Support Engineers fix this error for our customers.