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A Saffer/ Saffe/ Safa is a derogatory, mildly racist short term for a South African. Etymology: Stemming from the German, combining the abbreviation for South Africa (or South African) (SA-) with the German word for ape (-Affe). Use in a sentence Tell that Saffer not to come along!.
In computer science, shadow paging is a technique for providing atomicity and durability (two of the ACID properties) in database systems. A page in this context refers to a unit of physical storage (probably on a hard disk), typically of the order of 210 to 216 bytes. Shadow paging is a copy-on-write technique for avoiding in-place updates of pages. Instead, when a page is to be modified, a shadow page is allocated. Since the shadow page has no references (from other pages on disk), it can be modified liberally, without concern for consistency constraints, etc.