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Across: 2. This type of file allows you to generate a storage address from the data itself. 4. This type of file is in an order, often primary key order. 5. In hash files, you don't want to store data all over this. 7. A good hashing algorithm minimises these. 8. Good hashing algorithms need to be this.

Down: 1. A type of sequential file that can be used for batch processing but also allow fast look-up. 3. A file that is updated using a transaction file. 4. A file stored in no particular order (except time order). 6. A type of processing where you collect similar transactions over a period of time and then process them in the same way using off-peak resources.