For Oracle 11g, the time zone files are updated to version 3, which includes changes in the Daylight Savings Time rules implemented in the United States that took effect in 2015.When the transition rules for Daylight Savings Time (DST) change, existing data, particularly that with the datatype of TIMESTAMP WITH TIME ZONE, may be affected.Changing your OS to Windows Vista Installing Windows Vista Finishing the Installation Community Q&A Want to upgrade your old computer to Windows Vista?
In the second case, the value is corrected automatically when the time zone transition file was updated. In fact, updating the timestamp values in this case would actually cause the data to be wrong, so it's important to understand the point of reference for what the data represents.
The landmark book "Advanced Oracle SQL Tuning The Definitive Reference" is filled with valuable information on Oracle SQL Tuning.
This wiki How will teach you the most hassle-free method: a complete clean installation.
Set your BIOS to boot from CD, begin Setup, and let the files load. Choose your preferences, click "Install Now," then choose "Custom Install". Click “Drive options (advanced).” Delete the partition, then confirm. Select the "Unallocated Space" and click "Next" Let the files install. Enter your user name and computer name, then your product key.
There are several built-in DST DATE conversion functions for changing to daylight savings time: Periodically, Oracle updates the time zone files supplied with the database.