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Serializability

What determines serial execution order?

T1	T2	comments
`R(A)`
`add 50 to A`
`W(A)`
	`R(A)`	`T1 < T2` due to WR conflict on `A`
	`multiply A by 2`
	`W(A)`
	`R(B)`
	`multiply B by 2`
	`W(B)`
`R(B)`		`T2 < T1` due to WR conflict on `B`
`add 50 to B`
`W(B)`

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