The image rac2.gif illustrates the fault tolerance of listener failure. The image appears as follows, from left to right:

• On the left side of the image, a client computer is pictured, with a TNS entry for the rac 1 and rac 2 intances.
• In the center of the image, two nodes are pictured. Node 1 contains lsnr1 and the rac1 instance. Node 2 contains lsnr2 and the rac2 instance. The client computer was originally connected to lsnr1 (indicated by a dotted arrow), but when lsnr1 failed, the client computer automatically connected to lsnr2 (indicated by a solid arrow), since the client had both rac instances specified in its connect descriptor.
• On the right side of the image, the Shared Disk Database is pictured. Node 1 and Node 2 both connect to the Shared Disk Database.

End of description.