Read-only scale-out requires a separate license. See Separately licensed components.
Read-only scale-out is a configuration that allows you to offload reporting or other operations that require read-only access to the database.
A scale-out tree consists of the root node and copy nodes. The root node of a scale-out system has the only copy of the database that is writable. The root node can be either a single database, or a database mirroring system. Below the root node, there can be one or many branches of copy nodes. A copy node is a database server that runs a copy of a database for read-only access, and a copy node can be the parent of other copy nodes.
Tutorial: Setting up a read-only scale-out system
Setting up read-only scale-out
Adding copy nodes
Handling the loss of a parent connection
Connecting to copy nodes
Dropping servers from a scale-out system
Using read-only scale-out with database mirroring
SQL Anywhere web services high availability and scale-out solutions
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