ORA-00821: Specified value of sga_target 152M is too small, needs to be at least 304M

This error is come up when i tried to start a dummy instance by using rman in process of recovering a database. This error is caused because the SGA memory initialization is too small to start an instance. To solve this the workaround is to create an Operating System variable called ORA_RMAN_SGA_TARGET it can be done by typing

bash

export ORA_RMAN_SGA_TARGET=512M;

512M of memory is sufficient enough to start an instance. Then you can try to start the instance from rman again, hope this will help you 😀

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