data is often called the new gold, and databases are where we store and manage this precious resource as it constantly changes and grows. at first glance, updating data might seem like a simple...
数据被称为新黄金，数据库用于存储和管理数据。postgresql通过创建新行而非直接更新来保持数据一致性，采用多版本并发控制（mvcc）以支持高并发。清理过时数据的过程称为真空（vacuum），它清理死元组并防止事务id重用导致的数据不一致。真空可自动或手动执行，以确保数据库性能。
