mysql> show databases;
MySQL Export:
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mysqldump -u root -p --databases myschema > /var/www/html/myschema/backup_db/MySchema_20101228.sql
MySQL Import:
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mysql -u root -p --database myschema < /home/nista/myschema_temp/MySchema_20101228_1458.sql
MySQL Export just the schema:
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mysqldump -u root -p --no-data myschema > /var/www/html/myschema/backup_db/MySchema_no-data_20101228.sql