Mysql database backup and recovery -- mysqldump command

1. Backup and recovery of database
1） Back up the specified database
mysqldump -u root -p test > ./test.dump
2） Back up all libraries
mysqldump -u root -p --all-databases > ./all.dump
3） Restore all libraries
mysql -u root -p < ./all.dump
4） Restore the specified database
mysql -u root -p test <./test.dump

Be careful ： To restore the specified database , In fact, it is to restore all tables under the database . therefore , The database must exist