What is new in Oracle Database 23ai VS 19c?
这前总是通过 修改optimizer_feature_enable为不同版本，然后对比级联的参数变化，比较不同的数据库版本之间的参数差异，在Oracle 有个 ORAdiff app: https://oradiff.oracle.com/ 你也可以自己查询。
new feature
oracle 12c new feature: Automatic Report Capturing Feature
As part of this feature, some monitoring SQLs are executed by MMON_SLAVE to identify the resource-intensive SQLs and
generate the SQL Monitoring report automatically for those SQLs. Those SQLs consume little more CPU and it is expected behavior being a new feature
ORACLE 12.1 New Feature: Valid Time Temporal
Valid Time Temporal 特性就是基于表上的两个时间类型的字段做为开始和结束时间实现数据的有效性逻辑显示控制,oracle 12.1版本引入, 对于表中的记录可以控制只显示在有效时间内或限制时间字段为NULL值时