Fix Packs

Release:
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This is the term used by web sphere development and support for a major version of web sphere. The first 2 digits of the product version number identify the release
Ex:
web sphere 6.0, 6.1, 7.0

Refresh pack:
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This is a new term used to identify an update to the product version. that typically contains only defect fixes, but many also include feature additions and changes 
The third digit of the version number indicates a Refresh pack

Refresh pack :- Dissolving defects + Adding features 

Fix packs:
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This is the term used to describe a product update that infect includes only defects.
It only dissolve the defects, but ist didn't add any features.

Ex:-

6.0.1.5
6.0.2.6

Release---6.0
Refresh -6.0.1
Fix---6.0.1.5

Fix (or)Interim Fix:
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These two terms indicates a temporary or an emergency product update focused on a specific defect.This type of update is used to be referred as an emergency fix.

Steps to Install a refresh pack (or) a fix pack:-
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Note:

Stop all the applications before you install

1. Check version info to verify was version.(Versioninfo.sh)
2.Stop all the web sphere process that uses the installation.

3.Back up your configuration using the backup config command.
4. Extract the zipped archive file to the was root directory and execute update.exe inside your update installer directory.
5. (Restart)dmgr and any node agent for recycle profiles associated with the installation.