Joords Oracle DBA blog

Here are the list of Oracle Support ID's for Oracle Apps DBAs, I do refer regularly. Moreover, these are very informative. So, I thought of sharing those note ids here with you. Note : You have to have an account in Oracle Support to access id's. Points of Interest Installation Real Application Cluster (RAC) AD Utility Cloning Patching Upgrades Printer Performance Others Oracle Application DBA Field Guide

Oracle 11.2 fully supports continuing to use non-11.2 databases on a cluster that has been upgraded to 11.2. However, you should be aware that the Oracle 11.2.0.1 base release contained a number of problems that could affect users with a 10.2 database. Known problem with brand new installations of Grid Infrastructure 11.2 and pre-11.2 RDBMS instances is related to node pinning. During the upgrade, the nodes containing 10.2 RDBMS software will be pinned, allowing pre-11.2 databases to run on them. Important aspect is with Non-upgraded clusters are not automatically pinned, which causes problems with emca and dbca when executed from the pre-11.2 Oracle homes. You should use the utilities from the $GRID_HOME to manage resources provided by the same Oracle home. Similarly, when managing pre-11.2 resources, you can use the commands from their respective homes. This is a golden rule to remember You can find more information about problems with 10.2 databases and 11.2 Grid Infras...

The Single Client Access Name is a new feature that simplifies acces to a cluster database. In versions proir to Oracle RDBMS 11.2, an entry in the tnsnames.ora file for a n-npde RAC database always referenced all nodes in the address_list section. From Oracle RDBMS 11.2 the RAC databases can be covered with the SCAN method. A SCAN method is a hostname based method on 1 - 3 virtual IP-addresses based in the DNS of the organisation. The SCAN method solved an TNS ENTRY editing issue in the TNSNAMES.ORA, on actions of adding and removing nodes from the cluster. SCAN method makes my life easier in managing the Oracle sqlnet configurations for the Oracle cluster databases.