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DELETE FROM page WHERE user_id = 1
DELETE FROM user WHERE user_id = 1

DELETE FROM   page WHERE  page_id = '1'
DELETE FROM   page WHERE  page_id = '2'
...
DELETE FROM   page WHERE  page_id = '4'
DELETE FROM   page WHERE  page_id = '5'
DELETE FROM   user WHERE  user_id = '1'

FOREIGN KEY (user_id) references user (user_id) ON DELETE CASCADE,
KEY user_id (user_id)
# and replace "MyISAM" with "InnoDB" for both tables