A data store is said to provide read-your-writes consistency if a read operation
ID: 3874266 • Letter: A
Question
A data store is said to provide read-your-writes consistency if a read operation is always completed before a successive write operation by the same process.
a. true
b. false
Objects encapsulate data and operations on that data, so they cannot be safely replicated.
a. true
b. false
In general, a data store is said to be sequentially consistent when it satisfies the following condition: The result of any execution is the same as if the (read and write) operations by all processes on the data store were executed in some sequential order and the operations of each individual process appear in this sequence in the order specified by its program.
a. true
b. false
Client-initiated replicas are more commonly known as (client) caches. In essence, a cache is a local storage facility that is used by a client to temporarily store a copy of the data it has just requested.
a. true
b. false
Multicasting is best with pull-based approaches.
a. true
b. false
Explanation / Answer
1) false
a write operation is always completed before a successive read operation by the same process
2)false
3)true
The result of any execution is the same as if the (read and write) operations by all proceses on the data-store were executed in the same sequential order and the operations of each individual process appear in this sequence in the order specified by its program.
4)true
Client-initiated replicas are more commonly known as (client) caches. In essence, a cache is a local storage facility that is used by a client to temporarily store a copy of the data it has just requested. In principle, managing the cache is left entirely to the client. The data store from where the data had been fetched has nothing to do with keeping cached data consistent.
5)false
Pullbased approach is better towards the end
Pushpull is the best strategy