An easy way to select one db dump from multiple db MySQL dump
Take the difference between two 'CREATE DATABASE' using sed operation

eg 

sed -n '/^-- Current Database: `dbname`/,/^-- Current Database: `/p' alldatabases.sql &gt; output.sql


https://stackoverflow.com/questions/2342356/import-single-database-from-all-databases-dump

https://stackoverflow.com/questions/3596444/how-do-i-restore-one-database-from-a-mysqldump-containing-multiple-databases

Restoring a single database from mysql enterprise full backup