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From Eric Charles <e...@u-mangate.com>
Subject Re: [IMAP] Design flaws / Performance problems
Date Thu, 17 Jun 2010 21:29:27 GMT
Hi Norman,

I suppose it is applicable to all folders (Sent, Trash,...) and 
subfolders of INBOX (for example) ?
Could we also have the same logic for the size field ?
About your second point (the first recent message), I don't find my way. 
Why is it needed by imap and where is it implemented ?

Tks,
Eric


On 06/17/2010 06:38 PM, Norman Maurer wrote:
> Hi all,
>
> after testing a bit around with current version of imap I noticed some
> design flaws. These flaws just kick in when you have a lot of mail and
> slow things down.. So here is what I found and how I would like to fix
> it:
>
> 1) When selecting a Mailbox (a select INBOX) the count of all messages
> and the count of all recent messages get calculated on the fly. That
> works well on small mailboxes, but as more messages you have as slower
> it get.
> I would like to store the messageCount and recentMessageCount in the
> Mailbox and just update these on append/setFlags/expunge operations.
> To be sure we don't get corrupted data somehow, we should create some
> kind of backgroundprocess which recalculate these counts every X
> hours.
>
> 2) When selecting a Mailbox (a select INBOX) we need to get the first
> recent message. For this we fetch ALL recent messages and just return
> the first after that.
> I think we should just fetch 1 message, because we only need one!
>
> Thats it for now..
>
> WDYT ?
>
> Bye,
> Norman
>
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