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大公司一般有分布式kv存储，tair，redis，mongodb，高并发，每秒几万几十万都没问题，甚至每秒百万
实时库存数据放kv存储里去，先查库存再扣减库存，你在操作库存的时候，直接扣减，如果你发现扣减之后是负数的话，此时就认为库存超卖了，回滚刚才的扣减，返回提示给用户。对kv做的库存修改写MQ，异步同步落数据库，相当于异步双写，用分布式kv抗高并发，做好一致性方案