Restore MySQL Database

The Problem

You need to restore a database from a backup — after data loss, a bad migration, or moving to a new server — and doing it wrong (wrong character set, partial import, overwriting the wrong database) can make things worse rather than better.

About this problem

Restoring a database sounds simple (just run the SQL file back in) but a few things commonly go wrong: character set/collation mismatches that corrupt special characters, restoring over a database that still has data you needed, or a backup file that's incomplete because the original export was interrupted partway through.

This typically comes up during a server migration, after a data-loss incident, or when setting up a staging copy from a production backup.

What's Included

• Verifying the backup file is complete and valid before attempting the restore
• Restoring into the correct database with the correct character set and collation
• Checking data integrity after the restore, not just assuming a clean exit code means success
• Confirming your application connects and functions correctly against the restored data

What's NOT Included

• Recovering data that was never backed up in the first place
• Fixing the root cause that made a restore necessary in the first place (a separate diagnosis if relevant)
• Merging data between an old and new database — this is a straight restore, not a data merge

How It Works

1. Verify the backup file's integrity and check it isn't truncated or corrupted before starting.
2. Create the target database with the correct character set and collation matching the original.
3. Restore the backup into that database, watching for any errors during the import rather than assuming success.
4. Spot-check key tables and row counts against expectations to confirm the data genuinely came through intact.
5. Test the actual application against the restored database to confirm real-world functionality, not just that tables exist.

In practice: you buy the service, send over whatever access or details the job needs, I investigate and do the work, and you confirm it's resolved before we call it done.

Frequently Asked Questions

Why did my restored database show garbled text?

Almost always a character set or collation mismatch between the backup and the newly created database — getting this right before importing avoids corrupting special characters and emoji.

Can I restore a MySQL backup into a MariaDB server?

In most cases yes, since they're closely compatible at the SQL level, though it's worth checking for any MySQL-specific syntax the backup might use if it was created with newer MySQL-specific features.

How do I know if my restore actually worked?

Beyond the import command completing without errors, checking that expected tables exist with sensible row counts, and testing the actual application against the data, confirms a genuinely successful restore.

What happens if I restore into a database that already has data?

Depending on the restore method, it can overwrite, merge awkwardly, or fail outright with conflicts — restoring into a fresh, empty database is the safer default unless a merge is specifically intended.

Can a partial or interrupted backup still be restored?

Sometimes partially, but it risks an incomplete or corrupted restore — verifying the backup file's completeness before attempting the restore avoids discovering this partway through.

How long does restoring a database take?

It depends heavily on database size — a few megabytes can restore in seconds, while multi-gigabyte databases can take significantly longer, which is worth planning for around any downtime window.