Describe Oracle Patches

Regarding to Oracle Documentation patch is program (set of instructions) to fix a particular problem or enhance/ add a particular feature in existing program/product/software. And There’s Four kind of Oracle Patches :

  • One-off patches (bug fix)
  • CPU (security patches)
  • Upgrade patches (bug fixes)
  • PSU (bug fixes are security patches)

There’s another kind called Bundle Patched for windows and exadata.
The most two kind of patch that people get little confused about them is CPU and PSU what are they ? when should i use them ?  is there any different between them ?

First Thing you need to know about them since they have different name then sure it’s have different.

CPU:  security fixes each quarter rather than the cumulative database.

PSU : same as CPU  patches but include both the security fixes and priority fixes.Note Once a PSU is applied, only PSUs can be applied in future quarters until the database is upgraded to a new base version.
Which mean you can’t Apply CPU and PSU and same database.

Some MOS note that could be Useful :

Introduction to Oracle Patch Set Updates (PSU) 854428.1
Quick Reference to Patchset Patch Numbers [ID 753736.1]
Quick Reference to Patch Numbers for Database PSU, SPU(CPU), Bundle Patches and Patchsets [ID 1454618.1]
New Patch Nomenclature for Oracle Products [ID 1430923.1]

PSU  contain fix for bugs that cause Instance crash,Wrong results and Data Corruption on the other hand Dictionary changes , Major Algorithm changes ,and Optimizer plan changes not fixed by PSU.

to check Applied PSU patched you need to run :

opatch lsinventory -bugs_fixed | grep -i ‘DATABASE PSU’

 and if you need to check CPU :

 Select * from registry$history;

Thank you
Osama mustafa

Apply PSU Patch in Oracle

* You Must have two thing to apply PSU Patch :
1-Lastest version For Optach.
2-PSU Patch that you want to apply.


Steps:

$ORACLE_HOME/OPatch/opatch version

Output will be:
Invoking OPatch 11.2.0.1.7
OPatch Version:  11.2.0.1.7
OPatch succeeded 

1-you need to Update latest version For Optach, to do this :

cd $ORACLE_HOME

cp -r Optach/ /u01/backup/Optach

**make sure you in ORACLE_HOME

rm -rf $ORACLE_HOME/Optach

unzip Optach_that_you_download_from_MOS inside $ORACLE_HOME.

Patch Number :6880880

2-Check Optach After Doing Above Steps :

$ORACLE_HOME/OPatch/opatch version

Output will be:
Invoking OPatch 11.2.0.3.0
OPatch Version:  11.2.0.3.0
OPatch succeeded

3-Apply PSU Patch By Doing the Following, for example :

unzip p13923374_11203_.zip
cd 13923374
opatch apply

Answer the question that you been asked by Oracle 

4- Post Installation Steps :

cd $ORACLE_HOME/rdbms/admin
sqlplus /nolog
 SQL> CONNECT / AS SYSDBA
SQL> STARTUP
SQL> @catbundle.sql psu apply
SQL> QUIT