Difference between adding or removing a Device

[yardman 49]

Hello all:

 

I asked Michel the following question, and I've included his reply.

 

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Hello Michel:

 

It seems as though "removing" an Insteon switch or KPL button from a scene (group) is a much more rapid process that adding it. Am I imagining this, or is this really the case?

 

 

If this is really so, why would there be a difference? Wouldn't changing a link table require just as much time removing something as adding it.?

 

Hi Frank!

 

 

Yes, removing from scene is much faster than adding to a scene. The reason is this:

 

Each link record is 8 bytes the first one of which is a flag which describes the role of this link A2 (master), E2 (slave), and 22 (not used)

Adding devices into a scene scans the db and finds the first e2, and writes the whole 8 bytes for every linked device

Removing devices from a scene, scans the db for the link record for that specific scene, updates the first byte to 22, and moves the high watermark

 

 

In short for adding to a scene, we have to write 8 bytes, for removing we just update 1 byte and high water mark so you should see an approximately 4 time speed difference between the two operations.

 

 

With kind regards,

 

UDI Tech Support

More information: http://forum.universal-devices.com

Sent by: Michel Kohanim

 

 

 

[Mark Sanctuary]

I knew there was more data going down the pipe I just did not know it was a 4 to 1 difference. Thanks!