How to check Pre-requistics Patches while applying Database Patch using opatch

How to check Pre-requistics Patches while applying Database Patch using opatch

Checking any conflicts for the patches when applying any CPU, because this conflict's checking command is not there even in README.txt file that is distributed with patch.

Please use below command to check the conflicts aganist the oracle_home and avoid problems.

Step 1:unzip your patch zip directory

Step 2:run below command

$ORACLE_HOME/OPatch/opatch prereq CheckConflictAgainstOHWithDetail -phBaseDir <patch_directory>

Example:
$ unzip p8657018_10204_linux.zip
$ $ORACLE_HOME/OPatch/opatch prereq CheckConflictAgainstOHWithDetail -phBaseDir 8657018

Oracle Interim Patch Installer version 11.2.0.3.6
Copyright (c) 2013, Oracle Corporation.  All rights reserved.
PREREQ session
Oracle Home       : /u01/app/oracle/product/11.2.0.3/dbhome_1
Central Inventory : /u01/app/oraInventory
   from           : /u01/app/oracle/product/11.2.0.3/dbhome_1/oraInst.loc
OPatch version    : 11.2.0.3.6
OUI version       : 11.2.0.3.0
Log file location : /u01/app/oracle/product/11.2.0.3/dbhome_1/cfgtoollogs/opatch/opatch2014-07-24_17-52-50PM_1.log
Invoking prereq "checkconflictagainstohwithdetail"
Prereq "checkConflictAgainstOHWithDetail" passed.
OPatch succeeded.

Step 3: verify the Logfile

/home/oracle/patch/8657018
>ls -altr
total 24
-rw-rw-r-- 1 oracle oinstall 5905 May 14 03:35 README.txt
drwxr-xr-x 3 oracle oinstall 4096 May 14 03:35 files
drwxr-xr-x 4 oracle oinstall 4096 May 14 03:35 etc
drwxrw-rw- 3 oracle oinstall 4096 Jul 24 11:30 ..
drwxrwxr-x 4 oracle oinstall 4096 Jul 24 11:30 .
node1(TESTDB1)  /home/oracle/patch/18308717

vi /u01/app/oracle/product/11.2.0.3/dbhome_1/cfgtoollogs/opatch/opatch2014-07-24_17-52-50PM_1.log

[Jul 24, 2014 5:52:50 PM]    PREREQ session
[Jul 24, 2014 5:52:50 PM]    OPatch invoked as follows: 'prereq CheckConflictAgainstOHWithDetail -ph ./ -invPtrLoc /u01/app/oracle/product/11.2.0.3/dbhome_1/oraInst.loc '
[Jul 24, 2014 5:52:50 PM]    OUI-67077:
                             Oracle Home       : /u01/app/oracle/product/11.2.0.3/dbhome_1
                             Central Inventory : /u01/app/oraInventory
                                from           : /u01/app/oracle/product/11.2.0.3/dbhome_1/oraInst.loc
                             OPatch version    : 11.2.0.3.6
                             OUI version       : 11.2.0.3.0
                             OUI location      : /u01/app/oracle/product/11.2.0.3/dbhome_1/oui
                             Log file location : /u01/app/oracle/product/11.2.0.3/dbhome_1/cfgtoollogs/opatch/opatch2014-07-24_17-52-50PM_1.log
[Jul 24, 2014 5:52:50 PM]    Patch history file: /u01/app/oracle/product/11.2.0.3/dbhome_1/cfgtoollogs/opatch/opatch_history.txt
[Jul 24, 2014 5:52:50 PM]    Invoking prereq "checkconflictagainstohwithdetail"
[Jul 24, 2014 5:52:51 PM]    Patch 18308717 is not subset of any other patch processed till now
[Jul 24, 2014 5:52:51 PM]    Patch ID  18308717
[Jul 24, 2014 5:52:51 PM]    Patches that conflict: [  ]
[Jul 24, 2014 5:52:51 PM]    Checking conflicts for patch: 18308717
[Jul 24, 2014 5:52:51 PM]    Checking conflicts/supersets for patch: 18308717 with patch:18308717
[Jul 24, 2014 5:52:51 PM]    Checking conflicts/supersets for patch: 18308717 with patch:17076717
[Jul 24, 2014 5:52:51 PM]    Checking conflicts/supersets for patch: 18308717 with patch:17296419
[Jul 24, 2014 5:52:51 PM]    Checking conflicts/supersets for patch: 18308717 with patch:16475860
[Jul 24, 2014 5:52:51 PM]    Prereq "checkConflictAgainstOHWithDetail" passed.
[Jul 24, 2014 5:52:51 PM]    Finishing PrereqSession at Thu Jul 24 17:52:51 IST 2014

Message:Patch 8657018 is not subset of any other patch processed till now
From the above logs we can confirm that there are no-prerequistics patches to be applied before applying 8657018.