How to Resolve MySQL Query Timeout Error 'Lost Connection to MySQL Server'?

Troubleshooting MySQL Query Timeouts: "Lost connection to MySQL server"

Database operations, especially those involving tasks like adding indexes to large tables, can sometimes result in a MySQL error code 2013: "Lost connection to MySQL server during query." This often happens with queries that take a long time to execute.

Solution:

One effective way to resolve this is by modifying the timeout settings within MySQL Workbench. Newer versions provide a direct way to adjust these parameters.

Steps:

1. Access the MySQL Workbench preferences: Go to "Edit" -> "Preferences" -> "SQL Editor".
2. Find the "DBMS connection read timeout (seconds)" setting. The default is usually 600 seconds.
3. Increase the timeout: Set a higher value, for example, 6000 seconds (10 minutes). This gives the query more time to complete.
4. Alternative Solution: If you're dealing with very large queries, consider unchecking the "Limit rows" option. This removes the row limit and may prevent the timeout error without needing to adjust the timeout value.

This approach should allow longer-running queries to complete successfully, preventing the "Lost connection" error.

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