How can I create index(uniqie index) for a existed table?

Question

Hi guys,
I want to create a index for a existed table, it should be unique index. I did it using se11, "indexes," and select the radio button "unqiue index", of course the fields as well. But when I activate it, I get a waring and therefore can not create this index. But if I select radio button "non-uniqe index", it works.
However I have to reate a unqiue index.
How can I do it?
Thanks in advance
Regards,
Liying

Answer 1

HI Wang
You can create your index via SE11, enter the table name, click change, choose Go To, Indexes. Here create your index with the key fields that you want. To use the index, your select statement WHERE clause, you must have the key fields of the index in the order that they appear in the index. The "optimizer" will choose the index depending on your fields of the WHERE clause.
One thing to remember is that when you create indexes for tables, the update or insert of these tables may have a slower response then before, I for one have never seen a big problem as of yet.
this Document may help u on primary and secondary indexes :
http://jdc.joy.com/helpdata/EN/cf/21eb20446011d189700000e8322d00/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eb47446011d189700000e8322d00/content.htm
If it helps Reward the points
Regards,
Rk
Message was edited by:
        Rk Pasupuleti