Why does a database import stop with a timeout?

A browser-based import runs within limits set by PHP, the web server, the database server, and sometimes a reverse proxy. A large upload can exceed the request size, execution time, memory allowance, or connection timeout. The browser may show a generic error even though part of the SQL file has already been processed.

Check the phpMyAdmin message and server logs to learn which limit was reached. Before retrying, inspect the destination database for tables or rows created by the partial run. Starting the same import again without clearing or resuming correctly can produce duplicate-key errors or duplicate data.

Use a command-line database client, the host’s import utility, or a migration tool designed to resume in batches. Compressing the SQL file can reduce upload time but does not reduce the work needed to execute its statements. Splitting a dump is possible, although each part must preserve the correct SQL order and session settings.

For a live site, stop repeated attempts during normal traffic and plan one controlled retry. Back up the current state, prepare an empty destination, and choose a method that reports an exit status and errors clearly. Hosting support can often raise a temporary limit or run the import with server-side tools.