执行Oracle 19.6 的RU 升级，按官方文档的Readme，进行空间检查操作。

readme 文档给的步骤：

1.创建/tmp/patch_list_gihome.txt 文件，并添加如下内容：

[grid@www.cndba.cn ~]$ cat /tmp/patch_list_gihome.txt
/u01/software/30501910/30557433
/u01/software/30501910/30489227
/u01/software/30501910/30489632
/u01/software/30501910/
/u01/software/30501910/30655595
[grid@www.cndba.cn ~]$

2.运行opatch命令检查GI HOME下是否有足够的空间：

[root@www.cndba.cn software]# chown grid:oinstall /u01/software/30501910 -R

[grid@www.cndba.cn ~]$ $ORACLE_HOME/OPatch/opatch prereq CheckSystemSpace -phBaseFile /tmp/patch_list_gihome.txt
Oracle Interim Patch Installer version 12.2.0.1.17
Copyright (c) 2020, Oracle Corporation.  All rights reserved.

PREREQ session

Oracle Home       : /u01/app/19.3.0/grid
Central Inventory : /u01/app/oraInventory
   from           : /u01/app/19.3.0/grid/oraInst.loc
OPatch version    : 12.2.0.1.17
OUI version       : 12.2.0.7.0
Log file location : /u01/app/19.3.0/grid/cfgtoollogs/opatch/opatch2020-03-12_20-54-32PM_1.log

This command doesn't support System Patch.

OPatch failed with error code 21
[grid@www.cndba.cn ~]$ c

这里返回了：This command doesn’t support System Patch. 的错误，上MOS搜了一下，这个错误是目录不对。

Opatch napply returns ‘This command doesn’t support System Patch’ (Doc ID 2011660.1)

将patch文件修改成如下：

[grid@www.cndba.cn ~]$ cat /tmp/patch_list_gihome.txt
/u01/software/30501910/30557433
/u01/software/30501910/30489227
/u01/software/30501910/30489632
/u01/software/30501910/30655595
[grid@www.cndba.cn ~]$

因为之前配置文件中的/u01/software/30501910 是上级的SYSTEM Patch, 所以导致这里报错。 删除该行内容后，执行成功：http://www.cndba.cn/cndba/dave/article/4074http://www.cndba.cn/cndba/dave/article/4074

[grid@www.cndba.cn ~]$  $ORACLE_HOME/OPatch/opatch prereq CheckSystemSpace -phBaseFile /tmp/patch_list_gihome.txt
Oracle Interim Patch Installer version 12.2.0.1.17
Copyright (c) 2020, Oracle Corporation.  All rights reserved.

PREREQ session

Oracle Home       : /u01/app/19.3.0/grid
Central Inventory : /u01/app/oraInventory
   from           : /u01/app/19.3.0/grid/oraInst.loc
OPatch version    : 12.2.0.1.17
OUI version       : 12.2.0.7.0
Log file location : /u01/app/19.3.0/grid/cfgtoollogs/opatch/opatch2020-03-12_21-54-25PM_1.log

Invoking prereq "checksystemspace"

Prereq "checkSystemSpace" passed.

OPatch succeeded.
[grid@www.cndba.cn ~]$

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