does indexes need statistics?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello everybody,

Is it necesary the statistics be enabled when I create indexes or to
use them?

thanks

Mauricio Fernández A.
Ingeniero de Sistemas
U. Autónoma de Manizales
-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 6.0.2i

iQA/AwUBQ4X7u84irmZP1c6WEQLdzgCfS0S7kfz6DOdv1pPd9w9iBvKpYaYAn3bL
efk9bmafKvgTFjUxWZV1jGR/
=I7D6
-----END PGP SIGNATURE-----