Before enabling the MySQL slow query log, we must decide criteria for SQL statements that will be logged and also select the location where they will be logged.

$ mysqldump -hHOSTNAME -uUSERNAME -pPASSWORD --add-drop-table --no-data DB_NAME | grep -e '^DROP \| FOREIGN_KEY_CHECKS' | mysql -hHOSTNAME -uUSERNAME -pPASSWORD DB_NAME;

Even while trying to delete some tables from such a database, we come across situation where we face foreign key constraint error: "#1217 - Cannot delete or update a parent row: a foreign key constraint fails"

To avoid such errors first disable the foreign key checks, then do your job of importing the database or deleting the table and finally enable the foreign key checks.

Assuming that we have created the database say 'mynewdb' in which we have to import.

Run the following command

$ mysql -u username -ppassword mynewdb < dbbackupfile.sql

'mysqldump' command can be used to create backup of MySQL database as follows:

$ mysqldump -u username -ppassword dbname > dbname.sql

The above command assumes that you are running the 'mysqldump' command on the same server on which MySQL is installed.

It is highly recommended that you create indices on columns of a table from which you often query the data.

You can run the following statement to get detailed error information:

SHOW ENGINE INNODB STATUS;

# mysql --user=username --password=mypassword databasename;
# mysql -u username -pmypassword databasename;

mysql> SET PASSWORD FOR 'newuser'@'localhost' = PASSWORD('mypass');