在关系数据库中，无法表示为基本数据值的记录的对象必须通过数据库联结进行组装。
In a relational databases, objects that can't be represented as records of basic data values must be assembled through database joins.
如果将审计记录存放在DB 2表中，那么应该将这个日期值的记录放在一个方便的地方。
Keep a record of this date value in a handy place if you are keeping the audit records in DB2 tables.
一组经过变更的SDO还会维护一条其原始值的记录，从而支持某种类型的乐观性锁定算法。
A collection of SDOs that has been altered also maintains a record of its original values, enabling certain sorts of optimistic locking algorithms.
应用推荐