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What are Lock Objects, and their Differences
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Answer Posted / v.mari
Write lock-the locked data can be read or processed by one user only.A request for another shared lock is rejected
Shared lock-several users can read the same data at the same time,but as soon as a user edit the data .second user can no longer access this data.Rquest for further shared locks are accepted ,even if they are issued by different users,but exclusive locks are rejected.
Exclusive but not cumulative lock:Exclusive locks can be requested by the same transaction more than once and handled successively,but an exclusive but not cumulative lock can only be requested once by a given transaction.All other lock requests are rejected
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