What is shared cache and how you enable it?

The system assumes that a preloaded cache exists in the share directory. The preloaded cache contains most instances of the managed object types that are cached to file.
While booting application server, if shared cache is enabled but no cache files exist, the system reverts to unshared caching.
To set shared caching for the domain, set the Set ServerCacheMode to 1. With this option enabled, the system stores the cache information in the following directory:

<PS_HOME>\appserv\<DOMAIN_NAME>\cache\share