Bad indexes after software upgrade 7.3.00 Build 27

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Symptom
B*TREE BAD INDEX 865672 (ROOT) in the knldiag.err since the software upgrade to Version 7.3.00 Build 27.
Other terms
Bad index, performance problems Performance problems;
Reason and Prerequisites
Problems may occur with the database indexes in Versions older than 7.3.00 Build 25. Note 541895 contains more detailed information.
The affected indexes are deactivated as of Version 7.3.00 Build 27 (they [...]

J2EE on Oracle: Updating the JDBC drivers

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Symptom
You want to localize and update the JDBC driver in your Oracle-based J2EE engine system, or:You imported a patch into the Oracle database software on the central instance. However, the system response of the SAP J2EE applications with respect to JDBC has not been changed by this import, in particular possible errors are [...]