Database Reference
In-Depth Information
1000
us-west-1
us-east-1
eu-west-1
us-west-2
us-east-2
eu-west-2
100
10
1
0.1
0.01
1E-3
1E-4
0
600
1200
1800
2400
3000
Timeline per slave (second)
Fig. 7.10
The performance of the replication delay for up to 6 replica servers with the framework
enabled, delay
tolerance
D
500 ms, and int
v
l
mon
D
120 s
1000
us-west-1
us-east-1
eu-west-1
us-west-2
us-east-2
eu-west-2
100
10
1
0.1
0.01
1E-3
1E-4
0
600
1200
1800
2400
3000
Timeline per slave (second)
Fig. 7.11
The performance of the replication delay for up to 6 replica servers with the framework
enabled, delay
tolerance
D
2;000 ms, and int
v
l
mon
D
120 s
a total of 172 s, from 1,373 to 1,579 for a total of 207 s, and from 1,615 to 3,000 for
a total of 1,386 s. The adding of new replica servers is only triggered on the 1st and
the 4th periods based on the time point analysis. The 2nd and the 3rd periods do
not trigger the addition of any new replica servers as the number of detected SLA
violations does not exceed the defined threshold, T .
Figures
7.6
-
7.9
show the effect of varying the monitor interval, int
v
l
mon
on the
replication delay of the different virtualized database replica servers. The results
show that virtualized database replica server in
us-west-2
is always the first location
