>Is there some tools to make sure that
>your DBF, DBC or CDX files will remain correct
>after power supply crashing?
>Sometimes it's brokes and we get message: "index don't match database. recreate index".


There is no totally reliable way. However, you can take some safety measures:

1) Put the server on a battery backup.
2) Compaq makes servers with dual power supplies. If one fails, the other takes over automatically.