On 7 Jun 2016, at 8:13am, 刘翔 <liuxi...@pset.suntec.net> wrote:

> Problem:
> When update database and power off immediately,

How soon do you turn the power off ?  Two seconds ?  Ten seconds ?  One minute ?

What type of hard disk do you have ?  Is it a rotating disk or a solid state 
drive ?

Is the drive you have the database on the boot drive of the computer ?

If you try to make a database on an external drive (Flash drive ?  External 
rotating drive ?) instead of the drive you were using, do you see the same 
problem ?

Simon.
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