If you have been keeping up with the latest information for Discoverer on Oracle MetaLink you will have noted that Oracle recently announced that cumulative patch 8 for 10.1.2.2 is the last one for that platform and that the platform currently being developed is 10.1.2.3.
If you haven't already upgraded to 10.1.2.2 you should skip it and proceed direct to 10.1.2.3. The steps to installing 10.1.2.3 on a native 10.1.2.0.2 are identical to the steps that you would have to apply to install 10.1.2.2. This means that if you are using an infrastructure then you will have to upgrade the metadata repository from 10.1.0.4 to at least 10.1.0.5.
If you have already installed 10.1.2.2 and any of the cumulative patches the good news is that 10.1.2.3 (patch 5983622) will install directly on top as there is no need to de-install anything, the upgrade will take of it for you. After you have upgraded to 10.1.2.3 you should then proceed directly to install cumulative patch 2 (patch 7198716).
You might be wondering why I say to should upgrade only to cumulative patch 2 when cumulative patch 3 was released earlier this year. This is because there are some bugs in cumulative patch 3 and you are advised to wait until cumulative patch 4 which, by the way, I have heard is due for release within the next 2 to 3 weeks. Just as soon as it released I will update my master patch blog note.
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