Sessions
Every message is associated with a specific session. A session marks the beginning and end of all the activities prompted by a primary request message from outside InterSystems IRIS. Sessions are useful to you because they give you an easy way to see sets of related messages; the Management Portal provides an option for visually tracing the messages, and you can filter this display by session.
Each session has a unique numeric SessionID. All messages associated with a session use the same SessionID. InterSystems IRIS assigns these SessionIDs as follows:
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The primary request message starts the session. The SessionID is the same as the ID of the primary request message.
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Each additional message that is instantiated during this session has the same SessionID as the primary request, but has a unique message ID.
The following shows an example. Note that (unlike the example) the message IDs within a session are unlikely to be sequential in a production that has many business hosts. When creating a new message, InterSystems IRIS always uses the next available integer as the message ID.
