"Any Idea about how to read BLOB from DB"
The short answer is no way.
There does not seem to be a simple way to copy blobs either.
(
https://communities.ca.com/message/97590625#97590625
)
You can get the binary data with any query tool, but to interpret it to something meaningful is tough.
That is why the slices are there. In the slices the data is in legible format.
There are three ways I can think of how to the get data in blobs assuming the slices are not good enough.
1. Talk to the guys who wrote the code for creating the blobs and reading them at the time of Hoskyns, ABT and Niku.
Some of them are still involved and work for partners.
2. Put a trace on and save values to a timescaled portlet see how the java code involved writes the data and reverse engineer the read from that.
3. Get a copy of the Niku Curve Extractor (referred as NICE) from somebody and see if it still works.