Begin by ensuring your MySQL database is in a consistent state. This includes performing a backup and verifying data integrity. Check for any ongoing transactions and ensure they are either completed or rolled back. Use the `FLUSH TABLES WITH READ LOCK` command to lock tables if needed, ensuring no further writes occur during the data extraction process.

Export your MySQL database data using the `mysqldump` utility. This tool allows you to create a logical backup of your database, which you can later import into TiDB. Use the following command to export all databases or specify particular databases or tables:
```
mysqldump -u [username] -p --all-databases > all_databases.sql
```
Replace `[username]` with your MySQL username. This command will prompt you for your password and then generate a `.sql` file containing your database data.

Set up your TiDB environment if it's not already running. Ensure that your TiDB cluster is configured and operational. Verify that you have the necessary permissions to create databases and import data. Use the `mysql` client compatible with TiDB or connect through a tool like TiDB Dashboard to manage the database.

Before importing data, create the necessary database structure in TiDB. Use the `CREATE DATABASE` command to set up your databases as needed. You can do this manually or by executing the relevant parts of the `.sql` file generated during the MySQL export:
```sql
CREATE DATABASE example_db;
```

Use the `mysql` client or similar to import the `.sql` file into TiDB. This can be done with the following command:
```
mysql -h [tidb_host] -P [tidb_port] -u [username] -p < all_databases.sql
```
Replace `[tidb_host]`, `[tidb_port]`, and `[username]` with your TiDB host, port, and username, respectively. This command will prompt you for your password and then execute the SQL commands in the provided file to recreate the database structure and data in TiDB.

After the import, verify that the data in TiDB matches the original MySQL data. This can be done by running checksums or count queries to compare row counts and data samples between the original MySQL and the new TiDB databases. Ensure that all tables and records are accurately represented.

Once satisfied with the data migration, remove any temporary data or configurations used during the process. Consider optimizing the imported data in TiDB by analyzing tables or updating statistics to ensure efficient query performance. Use the `ANALYZE TABLE` statement in TiDB to gather statistics:
```sql
ANALYZE TABLE example_table;
```
This step is crucial for maintaining optimal performance within the TiDB environment.