I suspect you will be able to import 1 GB file through phpmyadmin But you can try by increasing the following value in php.ini and restart the wamp.
post_max_size=1280M
upload_max_filesize=1280M
max_execution_time = 300 //increase time as per your server requirement.
You can also try below command from command prompt, your path may be different as per your MySQL installation.
C:wampinmysqlmysql5.5.24inmysql.exe -u root -p db_name < C:some_pathyour_sql_file.sql
You should increase the max_allowed_packet
of mysql in my.ini
to avoid MySQL server gone away
error, something like this
max_allowed_packet = 100M
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