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What does the mailbox store consist of?

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What does the mailbox store consist of? - 2.May2005 11:57:00 PM

rn0rd0

Posts: 5
Joined: 2.May2005
From: Colorado Springs
Status: offline

Hello,
Can someone please explain to me the relationship between the priv1.edb and priv1.stm as it relates to the 16gb maximum of the store? Does one add these 2 db's together to get the magic number, or what? Thanks

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RE: What does the mailbox store consist of? - 3.May2005 1:55:00 PM

ScottyFryer

Posts: 410
Joined: 19.May2004
From: Toronto
Status: offline

the 16GB limit applies to the EDB and STM files added together, thats right.

A message database's .stm file stores contiguous sequences of streamed content. MIME-format messages from the Internet have a unique property: They always arrive as a stream of bytes. In Exchange Server 5.5, the Internet Mail Service (IMS) accepts inbound MIME messages and writes them to a disk queue, in which Exchange converts them to the internal Transport Neutral Encapsulation Format (TNEF) that the Information Store (IS) uses. Content can be converted back and forth several times, depending on whether an Internet or Messaging API (MAPI) client asks Exchange 5.5 for the message. Each conversion, however, results in a set of disk I/O operations, so unnecessary conversions increase the I/O load on your servers, reducing performance.

Exchange 2000 Server fixes this problem by making the .stm file the default location for inbound Internet-protocol traffic. Exchange 2000 converts a message's header properties to Rich Text Format (RTF) and stores them in the .edb file so that MAPI clients can use them. This process is called property promotion. If a MAPI client later requests another message property (including the message body), the IS converts that property to RTF and places it in the .edb file. After conversion, the message remains in the .edb file, never to return to the .stm file.

(in reply to rn0rd0)

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RE: What does the mailbox store consist of? - 3.May2005 2:22:00 PM

Henrik Walther

Posts: 6835
Joined: 21.Nov.2002
From: Copenhagen, Denmark
Status: offline

You might want to give Microsoft Exchange MVP Paul Robichaux credits for this answer, as it's copy/pasted from his column over at WindowsITPro.com [Wink]