EM won’t start after upgrade

After upgrading a database from 10.2.0.1 to 10.2.0.5, I was unable to start the Oracle Enterprise Manager. Whenever I tried to do so, the log showed that it failed to start Database Control. Even when I deconfigured the Enterprise Manager, deleted the repository and started from scratch, I still ran into the same problem. In this post, I will describe the symptoms I encountered and also provide a solution.

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Our solution to ORA-12571

After a database update from 10.2.0.1.0 to 10.2.0.5 on Windows Server 2003, we encountered the ORA-12571 error when starting the Application Server. In the log files, the error showed up as an SQLException:

java.sql.SQLException: Io exception: Connection reset by peer: socket write error

I then used TNSPing to validate the connection to the database and I basically received this result:

OK
OK
OK
ORA-12571: TNS:PACKET WRITER FAILURE

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Apply Patchset to Oracle 10gR2

One of the regularly recurring tasks is to apply a Patchset to a database. This post contains the basic steps required to apply Patchset 10.2.0.5 to an unpatched Oracle 10g Database (10.2.0.1). I am using this post mainly for my own reference, so please do not expect an extensive step-by-step guide. Note that you need Oracle Support (formerly Metalink) to access and download the patches.

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