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what's the difference of ".db" and ".db-journal"?

I found ".db" and ".db-journal" in /opt/usr/dbspace/.  why there are 2 db files?

 

 

 

thanks.

编辑者为: Brock Boland 17 3月, 2014 原因: Paragraph tags added automatically from tizen_format_fix module.

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wil smith
.db-journal is a temporary file used for Rollback operation if needed. So basically it gives you a DB backup mechanism.