The importance of error checking
	l Errors happen! n Failure happens when you don't expect errors! – database crash / network disconnection – lack of disk space for insert or select (sort space for order by) – server math error on select (divide by zero) – and maybe, just maybe, errors in your own code (Gasp!) n Beat failure by expecting errors! n Detect errors early to limit effects – Defensive Programming, e.g., check assumptions – Through Programming, e.g., check for errors after fetch loops
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