This figure shows a middle tier upgrade in four stages, including the events between the stages. In the first stage, the applications and configuration are at Release 2 (9.0.2) or (9.0.3). Installation of Release 2 (9.0.4) produces the second stage, a 9.0.4 middle tier on the same computer. Execution of the Upgrade Assistant produces the third stage, in which the 9.0.4 middle tier now contain the Release 2 (9.0.2) or (9.0.3) applications and configuration. Decommissioning of the old installation occurs; then, in stage 4, the 9.0.4 middle tier is the only middle tier on the computer.