Database Reference
In-Depth Information
1400.0
Consistent Read
Eventual Consistent Read
1200.0
1000.0
800.0
600.0
400.0
200.0
0.0
0
500
1000
1500
2000
2500
Number of Emulated Clients (Threads)
Fig. 5.7
Processed requests of Amazon SimpleDB
100.0
Consistent Read
Eventual Consistent Read
90.0
80.0
70.0
60.0
50.0
40.0
0
500
1000
1500
2000
2500
Number of Emulated Clients (Threads)
Fig. 5.8
Throughput percentage of Amazon SimpleDB
Monetary Cost
A new perspective on which customers are usually concerned in the context of
cloud computing is the trade-off against monetary cost. In
us-west
region, Amazon
SimpleDB charges $0:154 per SimpleDB machine hour, which is the amount of
cost for using SimpleDB server capacity to complete requests, and therefore can
vary depending on factors such as operation types and the amount of data to access.
The monetary costs of two read consistency options for the runs described above
are compared based on reported SimpleDB machine hour usage. Because the read
operations of all runs constantly read 14 bytes string data from SimpleDB, the cost
of read is constant, at $1:436 per one million requests, regardless of the consistency
