Install SoftPerfect Ram disk software(eg installed location is C:\Program Files\SoftPerfect)
Create a .bat with following content and run it:
REM stop db
oradim -SHUTDOWN -SID DB_SID
REM create a ram disk with letter that does not exists say 'D'
cd "C:\Program Files\SoftPerfect"
ramdiskws.exe /unmount:all /del:all
ramdiskws.exe /add:type=logon,letter=D,fs=NTFS,size=4500M,mount=yes
REM create data in the ram disk
xcopy /i C:\db\db_name D:\db_name
REM start the database
oradim -STARTUP -SID DB_SID
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