

结论
redis的key和string类型value限制均为512MB。
补充知识:Redis获取所有键值
通过遍历获取目标键值:
import redis
redis = redis.Redis(host='192.24.210.2', port='6666', password='',db=0)
keys = redis.keys()
for key in keys:
t = str(key)
print(t)
# print(key)
if t == "b'proxies'":
type = redis.type(key)
if type == b'string':
vals = redis.get(key)
elif type == b'list':
vals = redis.lrange(key, 0, -1)
# print(vals)
elif type == b'set':
vals = redis.smembers(key);
elif type == b'zset':
vals = redis.zrange(key, 0, -1)
elif type == b"hash":
vals = redis.hgetall(key)
else:
print(type, key)
print(vals)