Getting ORA-12505 after upgrade from PAO 3.5 to PA 6.1 when connecting with the PA GUI.
If there is a StealthCollect agent on the same machine as the repository database, this will need to be upgraded to the latest PA version as well to enable connection.
Please go to Support | Downloads and Updates area of our website (www.quest.com) and sign in with your e-mail address and password. Then under the Product box type Perf and then select the Product name Performance Analysis Oracle, then click on the search button.
Then click on All Platforms category to download the PA_Agent_Installer for the OS of the machine of the Stealth agent to be upgraded. Once you have downloaded the PA_Agent_Installer please copy it over to the machine required. If it is a unix/linux machine make sure the file is copied over in binary format within the ftp link to the server machine.
Within the PA_Agent_Installer there is an upgrade option, please use this to upgrade the agent installation.