Alternative to BerkeleyDB?

Question

I\'m looking for a dbm-like library that I can use in place of Berkeley DB, which I\'m currently using. My main reason for switching is the licensing fees for BDB are pretty hig

Answer 1

Firebird is your best friend.

Answer 2

SQLite is public domain, meaning you can use it for any purpose whatsoever, and is widely used and supported.

Answer 3

You can get much improved performance out of any dbm (even qdbm) and improved parallelism with a simple level of indirection: Simply take your keys and hash them, and use data_dir/H(key)/ as the database to store those keys. Limit the hash output to a small value (say) 255 for best results.

This approach has a number of benefits, easily summarized:

• Conceptually simple
• Easy to implement and test
• Doesn't lock the entire database for updates
• Can support much larger databases
• Easy to replace the DBM component

The hash probably doesn't even need to be cryptographically secure; just mostly uniform. DJB's cdb hash works well in most cases.