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



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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