How to disable a index

hi all,
how to disable an index created by
create index cc on sample(serialno);what are b-tree and bitmap indexes in detail.
what is meant by HASH function.
what is meant by reverse index.
thanks and regards,
sri ram.

Some Links:
Look here under unusable and rebuild (take care of restrictions, also described there):
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_1008.htm#i2136020
You can find a bit of informtion about b-tree-indexes here:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/schema.htm#sthref961
Reverse key Indexes:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/schema.htm#sthref998
Bitmap-Indexes:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/schema.htm#sthref1008

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Is there any way we can disbal the index in oracle.
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I tried the below command
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I am getting the below error message:
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Hello,
I have a question related to disabing index and thought I would post it in thread.
I'm altering a column length to increase the size and getting "ORA-30556: functional index is defined on the column to be modified".
On searching more about this error, it seems like the function index must be dropped before altering the column.
The table I'm dealing with is huge.
Question 1:
In case of dropping and recreating the index, should the following steps be done:
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- ALTER INDEX to turn on LOGGING
- Gather Statistics on that index
Question 2:
Is there anything else that should be done when the index is dropped and re-created?
Question 3:
What are the side-effects of carrying out the above steps in a huge table with around 15 million rows?
Question 4:
Would it work if I disable the index, alter the column and reenable the index?
Do I have to rebuild the index and gather Stats upon reenabling it?
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