Configure the value for virtual memory equal to the value of the Adaptive Server max memory configuration parameter.
When consolidating Adaptive Server instances, vSphere allows you to share memory across virtual machines that may be running the same operating systems, applications, or components. In this situation, vSphere uses a proprietary transparent page-sharing technique to reclaim memory, and allows databases to run with less virtual memory than physical memory (see your VSphere documentation). You can use transparent page sharing for consolidation purposes in a test or development environment. However, never overcommit on production environments.