Transcription of A Critique of ANSI SQL Isolation Levels
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A Critique of ANSI SQL Isolation Levels
A Critique of ANSI SQL Isolation Levels Hal Berenson Microsoft Corp. Phil Bernstein Microsoft Corp. Jim Gray Microsoft Corp. Jim Melton Sybase Corp. Elizabeth O'Neil UMass/Boston Patrick O'Neil UMass/Boston June 1995. Technical Report MSR-TR-95-51. Microsoft Research Advanced Technology Division Microsoft Corporation One Microsoft Way Redmond, WA 98052. A Critique of ANSI SQL Isolation Levels , Proc. ACM SIGMOD 95, pp. 1-10, San Jose CA, June 1995, ACM. -1- A Critique of ANSI SQL Isolation Levels Hal Berenson Microsoft Corp. Phil Bernstein Microsoft Corp. Jim Gray Berkeley Jim Melton Sybase Corp. Elizabeth O'Neil UMass/Boston Patrick O'Neil UMass/Boston Abstract: ANSI SQL-92 [MS, ANSI] defines Isolation distinction is not crucial for a general understanding.
peatable Reads, and Phantoms. This paper shows that these phenomena and theANSI SQL definitions fail to characterize several popular isolation levels, including the standard locking implementations of the levels. Investigating the ambiguities of the phenomena leads to clearer definitions; in addition new phenomena that better
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