Here's an article on how to check and install new fixes:
To find the Start tool, configure the database environment variables, and then run the command:
cd $ORACLE_HOME/OPatch > pwd /oracle/app/product/10.2.0/db_1/OPatch
To indicate that all patches apply to your database, use the lsinventory parameter:
[ oracle@DCG023 8828328]$ opatch lsinventory Oracle Interim Patch Installer version 11.2.0.3.4 Copyright (c) 2012, Oracle Corporation. All rights reserved. Oracle Home : /u00/product/11.2.0/dbhome_1 Central Inventory : /u00/oraInventory from : /u00/product/11.2.0/dbhome_1/oraInst.loc OPatch version : 11.2.0.3.4 OUI version : 11.2.0.1.0 Log file location : /u00/product/11.2.0/dbhome_1/cfgtoollogs/opatch/opatch2013-11-13_13-55-22PM_1.log Lsinventory Output file location : /u00/product/11.2.0/dbhome_1/cfgtoollogs/opatch/lsinv/lsinventory2013-11-13_13-55-22PM.txt Installed Top-level Products (1): Oracle Database 11g 11.2.0.1.0 There are 1 products installed in this Oracle Home. Interim patches (1) : Patch 8405205 : applied on Mon Aug 19 15:18:04 BRT 2013 Unique Patch ID: 11805160 Created on 23 Sep 2009, 02:41:32 hrs PST8PDT Bugs fixed: 8405205 OPatch succeeded.
To view patches using sql:
select * from registry$history;
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