DevOps, CI/CD and Automation

my DB is oracle 11.

develop language is python 2.7.

i use following statement to get record from DB. and the row number is nearly 0.5 billion

statements:

sql = "select count(*) from dwrsdm.bl_inv_stock_erp "

cursor.execute(sql)

result = cursor.fetchall()

print result;

sql = "select * from dwrsdm.bl_inv_stock_erp"

cursor.execute(sql)

result = cursor.fetchall() -------error happen

error happen when it run the second " cursor.fetchall()", it prompt

"cx_Oracle.OperationalError: ORA-03113: "

I am sure the error happen for the return records is too huge. How can I solve the problem?