The following are the memory requirements for Oracle Database Instant Client 19c:

• At least 512 MB of RAM.

  To determine the physical RAM size, use System Profiler (/Applications/Utilities/System Profiler) or enter the following command:

  $ /usr/sbin/system_profiler SPHardwareDataType | grep Memory

  If the size of the physical RAM is less than the required size, then you must install more memory before continuing.

The following are the RAM requirements:

• Up to 512 MB

• Between 513 MB and 726 MB

• More than 726 MB

To determine the available RAM, enter the following command:

$ free

https://support.apple.com/en-in/guide/activity-monitor/actmntr1004/mac