Why Am I Losing My MySQL Connection During Data Import?

Troubleshooting Lost MySQL Connection During Query

While attempting to import data from a CSV file into a MySQL table, you may encounter an error indicating a lost connection to the MySQL server. This error can occur due to various reasons, such as:

• Prolonged query execution due to large data sets, resulting in connection timeout.
• Exceeding the maximum packet size limit for MySQL, leading to connection loss.

Resolution

To resolve this issue and establish a stable connection during data import, consider the following two steps:

1. Adjust MySQL Configuration

Modify your MySQL configuration file (my.cnf or my.ini) to increase the max_allowed_packet setting. This parameter defines the maximum size for packets that can be exchanged between the client and server. By setting it appropriately (e.g., to 32M), you can accommodate larger data transfers and reduce the risk of connection loss.

2. Utilize Command-Line Import

If the issue persists, you can try importing the data directly using the MySQL command-line interface:

mysql -u <user> --password=<password> <database name> <file_to_import>

This approach bypasses the intermediary software and establishes a direct connection between your client and the database, potentially resolving connection stability issues. By following these steps, you can optimize your MySQL configuration and restore a reliable connection during data import, ensuring a seamless transfer process.

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