Hi Mahmoud_Rabie

have you check that?

https://maxrohde.com/2014/06/21/convert-dynamically-sized-virtualbox-vdi-hard-drive-to-fixed-size/

Not interest about Docker Container? Docker could be great for you. I used Oracle Development VM in the Past. Now i am on DOCKER.

I am satisfied with Performance and Benefits for DOCKER.

Just give a Try. You can start with that Docker Image

https://github.com/Dani3lSun/docker-db-apex-dev

Hier is some differences between Docker and VM

http://www.channelfutures.com/technology/docker-vs-virtual-machines-understanding-performance-differences

Regards

pierre

Hello Mahmoud,

I don't think you'll gain this way any significant performance improvement, however here are few tips what to do to make your work more comfortable and faster.

1) Check how much RAM your VM can use. By default it is (I think) only 1GB, which is insanely low (minimal HW requirement for 12c is 2 gigs). If you can, at least double it, ideally give it 4 gigs or more.

2) Setup Port Forwarding in Settings => Network => Advanced. As we probably need only port 1521 for oracle (eventually some other one for debugging) and 8080 for ORDS,

Then you'll be able to access your ords from the host machine at the address http://localhost:8080/ords and also the Oracle instance would be "running" at localhost:1521. Now you can access the services "remotely" from the host system with your favourite tools, so you don't need X windows running on the Linux machine.

3) Change default runlevel on the Linux VM to save some memory and to speedup the boot time (however do not expect miracles - it just takes a "while" to start Linux+Oracle EE+ORDS). To do so, just change the default runlevel to multi-user.target

https://www.itzgeek.com/how-tos/linux/centos-how-tos/change-default-runlevel-in-centos-7-rhel-7.html . It's possible to start X whenever needed.

I hope with these settings you'll be satisfied with the VM speed.

Regards,

Pavel

edit: ad 1) together with RAM give the system also more than  just one (by default) processor/core.