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(#M40030373) DBMS Programming question DBMS Keep an EYE

What is view equivalence?

Asked In DBMS MAN (11 years ago)

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jyoti  (10 years ago)

Two schedules S1 and S2 are said to be view-equivalent when the following conditions are satisfied:

If the transaction T_i in S1 reads an initial value for object X, so does the transaction T_i in S2.
If the transaction T_i in S1 reads the value written by transaction T_j in S1 for object X, so does the transaction T_i in S2.
If the transaction T_i in S1 is the final transaction to write the value for an object X, so is the transaction T_i in S2.

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