Get a comprehensive eye exam.
Use proper lighting.
Minimize glare.
Upgrade your display.
Adjust your computer display settings
Blink more often.
Exercise your eyes.
Take frequent breaks.
The cursor should move right but if not give me more information to correct my statement
Answer:
Changing the customer number on a record in the Orders table to a number that does not match a customer number in the customer table would violate referential integrity.
If deletes do not cascade, deleting a customer that has orders would violate referential integrity.
If deletes cascade, customer can be deleted and all orders for that customer will automatically be deleted.
Get a dedicated server with 6-10gb RAM, which might be able to run a lot, while staying up with no lag.