Can we create a database index?

Hi all..
Can we create a database index for a customised table? and later on can we change the same database index?
Also if possible please provide me with a suitable link for this topic.
Thanks

HI
PLEASE REFER THE LINKS
1 <a href="http://72.14.203.104/search?q=cache:cHuHvVv9UfgJ:help.sap.com/saphelp_nw04/helpdata/en/cf/21f0f0446011d189700000e8322d00/content.htm+adatabaseindexIN+ABAP&hl=en&gl=in&ct=clnk&cd=1">Editing Tables and Indexes in the Database</a>
2 <a href="http://72.14.203.104/search?q=cache:mIR0TLmS_fsJ:help.sap.com/saphelp_nw04/helpdata/en/cf/21eb20446011d189700000e8322d00/content.htm+adatabaseindexIN+ABAP&hl=en&gl=in&ct=clnk&cd=2">Indexes</a>
<a href="http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eb47446011d189700000e8322d00/content.htm">Creating Secondary Indexes</a>
IF THESE ARE USEFUL PLEASE REWARD POINTS
REGARDS
ANOOP
Message was edited by: ANOOP R.S

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Can we create a database index?

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