The image shows the flow of information before and after an Oracle RAC node failure on the primary database. Shown at the top of the image is a client system, at the bottom left is a four-node RAC system representing the primary database with the first node down, on the lower right is a four-node RAC representing the Active Data Guard standby database, and in the center is a group of overlapping boxes representing the client connections to the database, such as Java, JDBC, PHP, python, ORDS, and .NET. There are four numbered, double-ended arrows showing the progression of the failover scenario. The arrow labeled "1" is a solid line between the first node of the primary database and the group of connections. There are two arrows labeled "2" which are dotted lines between the client conecctions and an "up" RAC node in both the primary database and the active standby. The up nodes that are being pointed to by those arrows is labeled "3". The arros labeled "4" is a solid line between the client connections and the client system.