Intent Shared Lock

Which one of the following is descriptive of the effect of an Intent Shared Lock on other transactions?
CHOICE1:
A Read Lock that prevents writes
CHOICE2:
A Read Lock that prevents other reads
CHOICE3:
A Read Lock that prevents more restrictive Locks
CHOICE4:
A Read Lock that allows other reads
CHOICE5:
A Read Lock that allows writes (Dirty Reads)

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hmounir

  • May 3rd, 2010
 

A Read Lock that allows other reads 
Shared (S) locks allow concurrent transactions to read (SELECT) a resource under pessimistic concurrency control.
No other transactions can modify the data while shared (S) locks exist on the resource. Shared (S) locks on a resource are released as soon as the read operation completes.

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