Henrique, who maintains the Debian cyrus-imap packages (and does a very good job of it) just changed the MBOX and SEEN databases to use skiplist (from db3 and flat). I had never thought about this issue before.

Can someone explain what advantages and disadvantages one has from the different database types? And what is a skiplist anyway? I'm familiar with flat files and the sleepycat databases, but I've never heard of a skiplist.

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