RHEHAT 7.4+ RAC +12.2.0.1 升级到19.3（含Grid Infrastructure+DB升级）升级指导

客户的一套环境：RHEHAT 7.4+ RAC +12.2.0.1 升级到19.3；

目前通过MOS找到资料在升级过程中经常遇到各种文件权限问题，导致升级中断。
参考资料如下：
GI 12C 升级19C
1）
Doc ID 2561230.1
Oracle Restart : How to Successfully Upgrade 12x Grid Infrastructure Standalone to 19.x Grid Infrastructure Standalone( (Doc ID 2561230.1)
https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=347787353997351&id=2561230.1&displayIndex=1&_afrWindowMode=0&_adf.ctrl-state=xfx85dyuo_426#FIX

2）19c grid安装升级文档
https://docs.oracle.com/en/database/oracle/oracle-database/19/cwlin/example-of-verifying-system-upgrade-readiness-for-grid-infrastructure.html#GUID-1411211D-3222-4AE4-B07F-3EA89844A2C9

DB 12C 升级19C

1）dbua 升级–官方文档
https://docs.oracle.com/en/database/oracle/oracle-database/19/spuss/using-dbua-to-upgrade-the-database.html#GUID-307DACD9-ECEE-4079-B767-B22620B99900

2）mos 文档
Oracle 19c - Complete Checklist for upgrading Oracle 12c, 18c Container Database (CDB) to Oracle 19c Release using DBUA (Doc ID 2543981.1)
https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=349666242093158&id=2543981.1&displayIndex=1&_afrWindowMode=0&_adf.ctrl-state=xfx85dyuo_676#aref_section32
Oracle 19c - Complete Checklist for Upgrading to Oracle Database 19c (19.x) using DBUA (Doc ID 2545064.1)
https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=349673778233724&id=2545064.1&displayIndex=4&_afrWindowMode=0&_adf.ctrl-state=xfx85dyuo_717#aref_section36

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