transport/use_in_memory_opt is a SAP Parameter attribute which is used to control Option to disable DB specific optimization during transport/upgrade information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter is used to deactivate database-specific optimizations in
application programs during a transport or an upgrade to avoid errors in
the transport or upgrade.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.