8.1事务管理的基本概念
Storage hierarchyX
x Memory Memory
x Disk
The space of disk blocks The virtual or main memory address space The local address space of the transaction
Input (x): block with x →memoryOutput (x): block with x →disk
Read (x,t): do input(x)if necessary
t ←value of x in block
Write (x,t): do input(x)if necessary
value of x in block ←t
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