How to Fix Error Code 2013 Lost Connection to MySQL?

Encountering the “Error Code 2013: Lost connection to MySQL server” can be a frustrating experience for database users. This error typically occurs when the MySQL client loses connection to the server, leading to data retrieval or manipulation disruptions. In this article, we’ll explore the causes of this error, delve into the syntax where it commonly arises, and discuss effective methods to resolve and prevent it.

So in this article, we will learn How to fix Error Code 2013 Lost connection to the MySQL server. , using the syntax and what are the methods we can use here with some examples.

MySQL error code 2013, “Lost connection to MySQL server during query,” can manifest in different contexts and with varying error messages. Here are some common variations and their potential causes:

1. Lost Connection to MySQL Server During Query

This error occurs when the server is unable to maintain the connection during the execution of a query. It can be caused by:

• Long-running queries exceeding the timeout settings.
• Network issues causing disconnections.
• Server overloads lead to dropped connections.

Example Message:

ERROR 2013 (HY000): Lost connection to MySQL server during query

2. Lost Connection to MySQL Server at ‘reading initial communication packet’

This error typically occurs during the initial handshake process between the client and the server. Common causes include:

• Incorrect server hostname or IP address.
• Misconfigured MySQL server settings.
• Firewall rules blocking the connection.

Example Message:

ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 2

3. Lost Connection to MySQL Server During Connection

This error happens when the client loses connection while attempting to establish a connection to the server. Possible causes include:

• Network instability.
• Server resource limitations.
• Configuration issues on the MySQL server.

Example Message:

ERROR 2013 (HY000): Lost connection to MySQL server during connection

4. Lost Connection to MySQL Server at ‘reading authorization packet’

This error occurs during the authorization phase when the server is verifying the client’s credentials. It may be caused by:

• Network issues interrupting the authentication process.
• Incorrect user credentials.
• Configuration problems in the MySQL server.

Example Message:

ERROR 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet'

5. Lost Connection to MySQL Server at ‘sending authentication information’

This error indicates a problem when the client is sending authentication information to the server. Potential reasons include:

• Network disruptions.
• Server misconfigurations.
• Problems with the MySQL client.

Example Message:

ERROR 2013 (HY000): Lost connection to MySQL server at 'sending authentication information'

The MySQL error 2013, “Lost connection to MySQL server,” typically occurs due to one of the following reasons:

1. Network Issues: Network disruptions, such as intermittent connectivity or a firewall blocking the connection, can lead to a lost connection with the MySQL server.
2. Server Timeout: If the MySQL server takes longer than the defined timeout period to respond, the client connection may be terminated, resulting in the error.
3. Server Overload: Heavy load on the MySQL server or insufficient server resources can cause it to become unresponsive, leading to lost connections.

To resolve this error, check network configurations, adjust timeout settings, optimize server resources, and ensure that the MySQL server is running smoothly.

1. Adjust Timeout Settings: Increase the wait_timeout and interactive_timeout values in your MySQL configuration file to allow longer connections.
2. Check Network: Examine the network connection between the client and server. Ensure there are no disruptions, and consider adjusting network configurations if necessary.
3. Optimize: Optimize your SQL queries to reduce execution time and resource consumption, potentially preventing connection timeouts.

As a MySQL server administrator, consider tweaking certain values to address the “Lost connection to MySQL server” issue. According to MySQL documentation, you might find it beneficial to increase parameters such as net_read_timeout or connect_timeout on the server, offering potential relief from connection disruptions.

For those without administrator privileges on the MySQL server, a viable option is to adjust timeout values on the client side. By increasing the timeout values in your MySQL client configuration, you can potentially mitigate connection losses and enhance the reliability of your interactions with the server.

MySQL Workbench

• MySQL Workbench users can conveniently modify timeout settings within the application
• Navigate to the application menu.
• Select “Edit” > “Preferences” > “SQL Editor.”
• Locate the “MySQL Session” section and amplify the value for “DBMS connection read timeout.”
• Save the modified settings, close MySQL Workbench, and then reopen the connection to ensure the changes take effect.

Example 1: SQL Schema with Long-Running Query

-- Schema
CREATE TABLE large_table (
    id INT PRIMARY KEY,
    data VARCHAR(255)
);

-- Inserting sample data
INSERT INTO large_table (id, data)
VALUES 
(1, 'Lorem ipsum dolor sit amet'),
(2, 'Consectetur adipiscing elit'),
-- ... add more sample data ...

-- Long-running query
SELECT * FROM large_table WHERE LENGTH(data) > 1000;

Output:

In this example, we create a table named large_table with some sample data. The long-running query is designed to fetch rows where the length of the data column is greater than 1000 characters, simulating a resource–intensive operation.

Example 2: SQL Schema with Network Disruption:

-- Schema
CREATE TABLE sensitive_data (
    user_id INT PRIMARY KEY,
    username VARCHAR(50),
    password VARCHAR(50)
);

-- Inserting sample data
INSERT INTO sensitive_data (user_id, username, password)
VALUES 
(1, 'john_doe', MD5('password123')),
(2, 'jane_smith', MD5('securepass')),
-- ... add more sample data ...

-- Data-intensive operation
UPDATE sensitive_data SET password = MD5(CONCAT(username, NOW()));

Ouput:

In this example, we create a table named sensitive_data with some sample data. The data-intensive operation involves updating the password column with a hashed value based on the username and the current timestamp, simulating an operation that may cause network disruptions.a

So, to resolving the “Error Code 2013: Lost connection to MySQL server” involves a combination of adjusting timeout settings, addressing network issues, and optimizing queries. By understanding the potential causes and implementing preventive measures, users can ensure a more stable and reliable connection between the MySQL client and server. Remember, a proactive approach to optimize queries and maintain network stability goes a long way in preventing this error and enhancing the overall performance of MySQL database interactions.