Match the English specification on the left with the representation in propositional logic on the right. Let the propositions be s: "The transaction has a shared lock on the database element," e: "The transaction has an exclusive lock on the element," m: "The transaction can modify the element," and r: "The transaction can read the element." i Instructions The transaction has a shared lock on the element only if it can read the element but cannot modify it. If the transaction has an exclusive lock on the element, then it can modify the element and read the element. The transaction has a shared lock on the element if and only if it can read the element but cannot modify the element. The transaction either has an exclusive lock or a shared lock on the element, and it can modify the element.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Match the English specification on the left with the representation in propositional logic on the right.

 

Let the propositions be s: "The transaction has a shared lock on the database element," e: "The transaction has an exclusive lock on the element," m: "The transaction can modify the element," and r: "The transaction can read the element."

s+ (r ^ ¬m)
(e V s) лт
s + (r A -m)
e + (r A m)
Transcribed Image Text:s+ (r ^ ¬m) (e V s) лт s + (r A -m) e + (r A m)
Match the English specification on the left with the representation in propositional logic on the right.
Let the propositions be s: "The transaction has a shared lock on the database element," e: "The transaction has an exclusive lock on the element," m: "The
transaction can modify the element," and r. "The transaction can read the element."
i Instructions
The transaction has a shared lock on the
element only if it can read the element but
cannot modify it.
If the transaction has an exclusive lock on
the element, then it can modify the element
and read the element.
The transaction has a shared lock on the
element if and only if it can read the
element but cannot modify the element.
The transaction either has an exclusive lock
or a shared lock on the element, and it can
modify the element.
Transcribed Image Text:Match the English specification on the left with the representation in propositional logic on the right. Let the propositions be s: "The transaction has a shared lock on the database element," e: "The transaction has an exclusive lock on the element," m: "The transaction can modify the element," and r. "The transaction can read the element." i Instructions The transaction has a shared lock on the element only if it can read the element but cannot modify it. If the transaction has an exclusive lock on the element, then it can modify the element and read the element. The transaction has a shared lock on the element if and only if it can read the element but cannot modify the element. The transaction either has an exclusive lock or a shared lock on the element, and it can modify the element.
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