Figure 3-4 shows the processing when failover occurs on a monitoring Microsoft SQL Server host.
Figure 3-4 Processing when a monitoring Microsoft SQL Server host performs failover
![[Figure]](figure/zuq03003.gif)
- Note:
- A failover on the monitoring Microsoft SQL Server host may cause temporary errors in the historical collection of the performance data.
- Moreover, before and after the failover, the value of collected data may be negative. Note that for data after the failover is completed, positive values are used as the data differentials.