参考文档：
Oracle Database Oracle Database Patch Maintenance, Release 19c and Later Releases
Introducing Monthly Recommended Patches (MRPs) and FAQ (Doc ID 2898740.1) -
Sunsetting of 19c RURs and FAQ (Doc ID 2898381.1).
Primary Note for Database Proactive Patch Program (Doc ID 888.1)
Oracle Database 19c Important Recommended One-off Patches (Doc ID 555.1)
Release Schedule of Current Database Releases (Doc ID 742060.1)
当前数据库版本的发行时间表 (Doc ID 1626244.1)
Database Patch Conflict Resolution (Doc ID 1321267.1)
数据库补丁冲突解决方案 (Doc ID 1674432.1)
How to confirm applied MRP (Doc ID 2941520.1)
Should I ask for a one-off bug fix or wait for the next Release Update (Doc ID 2648544.1)
关于Oracle MRP补丁。官方解释是这样的
- Monthly Recommended Patches (MRP)
Starting with update 19.17, Oracle is providing MRPs for Linux x86-64 to provide proactive patching between Release Updates.
所以，从19.16开始 ，看不到Oracle Database Update Revisions 补丁了。从MOS上的下图可以看到。因为被MRP补丁取代了。（这个补丁，是在原来每个季度的RU的基础上，再修订2个版本）
如何查看MRP补丁，可以参考How to confirm applied MRP (Doc ID 2941520.1)
RU是每个季度发行一次，官方参考文档内容如下：
每个季度发行一个版本的RU
Example 1-1 Apply the next RU each quarter
The following table shows an example of how you can apply a release update each quarter. Starting in October, you install RU 19.17.0. In January, you install RU 19.18.0. In April, you install RU 19.19.0. In July, you install RU 19.20.0. In October, you install RU 19.21.0.
| Patch Type | October | January | April | July | October |
|---|---|---|---|---|---|
| RU | 19.17.0 | 19.18.0 | 19.19.0 | 19.20.0 | 19.21.0 |
而MRP补丁是在RU补丁基础上，每个月发行一次。官方文档的内容如下：
比如：19.17的RU补丁，每个月的MRP补丁在19.17基础上更新，持续6个月。19.18的补丁，同理。
Table 1-1 Patch Schedule for RU 19.17.0
| MRP | October 2022 | November 2022 | December 2022 | January 2022 | February 2022 | March 2022 | April 2022 |
|---|---|---|---|---|---|---|---|
| MRP for 19.17.0 RU | n/a | 221115 | 221220 | 230117 | 230221 | 230321 | 23418 |
Table 1-2 Patch Schedule for RU 19.18.0
| MRP | January 2023 | February 2023 | March 2023 | April 2023 | May 2023 | June 2023 | July 2023 |
|---|---|---|---|---|---|---|---|
| MRP for 19.18.0 RU | n/a | 230221 | 230321 | 230418 | 230516 | 230620 | 230718 |
MRP补丁的格式，官方文档内容如下：
For example:
CopyPatch 34522319 - DATABASE MRP 19.17.0.0.221115
其他问题，可以参考官方文档或MOS。
END
2023.05.20 PM ,Linux Mint。
