How to exchange a line in a text file with a different one, when using double quotation marks in the text itself?

The following sed command will exchange the string

initParams=

with

initParams=undo_tablespace=UNDOTBS1,sga_target=9GB,db_block_size=32768BYTES,control_files=\"\/u02\/oradata\/{DB_UNIQUE_NAME}\/control01.ctl\"\,\"\/recovery\/fra\/{DB_UNIQUE_NAME}\/control01.ctl\"),db_recovery_file_dest=\/recovery\/fra\/{DB_UNIQUE_NAME}

in the file "myresponsefile.rsp":

sed -i "s/initParams=/initParams=undo_tablespace=UNDOTBS1,sga_target=9GB,db_block_size=32768BYTES,control_files=\"\/u02\/oradata\/{DB_UNIQUE_NAME}\/control01.ctl\"\,\"\/recovery\/fra\/{DB_UNIQUE_NAME}\/control01.ctl\"),db_recovery_file_dest=\/u04\/recovery\/{DB_UNIQUE_NAME} /" myreponse_file.rsp

Note that all double quotes (") and forward (/) slashes must be masked by the backslash charcater \ to be interpreted correctly.