I need to create a large amount of records which relate three other entities. Just for example, take 100 people; 100 days; and 100 restaurants. To create a record for an intersection of a person/day/ restaurant, it's possible to create keyname of person.key()+day.key() +restaurant.key(). And to retrieve records, it's easy to generate a list of keys and use a db.get().
In the internet somewhere, I read a comment by Nick Johnson saying that long keynames are inefficient, and that it can be a good idea to use a MD5 or SHA1 hash function to shorten the key name. My question is, how expensive are the MD5 and SHA1 functions? For example, if I need to generate 100 keys for each view (e.g. to retrieve people who visited 1 restaurant in 1 day, I can generate 100 keys and db.get() that list) - is it cheaper to use the MD5 hash to keep key_names shorter? Or is the cost of generating the hashes more than any savings from shortening the keys? -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
