Am Mittwoch, den 10.01.2007, 00:04 +0100 schrieb Stefano Bagnara: > >> > there are various methods to get various > >> > flavours of session. > >> > >> Currently there are three. > >> The problem is that IMAP has many requirements to a backend. Many > >> backends successfully used for POP3 will probably never fulfill them. > > > > perhaps it depends on the abstractness of the perspective: i suspect > > that it all reduces to storing the email content and meta-data about > > the email, at least for the storage. > > The problem is efficently retrieve data. > We may want to access messages by 3 different identification mechanisms. > Then we need to return a subset of messages given specific filters > (mailbox, folder, search term, tag) and return size and some header > without running "full table scans" and without retrieving the full messages.
Exactly. Message get stored once and multiple times read. Web-mail and most MUAs with default configuration do not cache IMAP mail at all. Mailboxes will grow fast. (10000+) When it gets opened by the client, it requests flag, date, size and a subset of the headers. For instance fetching a small subset of the headers of many messages has to be done in an optimal way. (e.g. in one SQL query) Joachim --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
