Difference between SID and instance number

[Former Member]

Hi,

Can you please tell me the difference between SID and Instance number.

Can one SID have any no if instance.But i think u can have only one SCS.Please explain

[Former Member]

You only have a single SID (system ID) per System and can have multiple instance numbers per SID -

For example - we have a central instance and an application server on our QA System

SID = QA1

Instance number 00 for Central Instance and 01 for Application server

Our Production system's SID is PR1 and we have 00, 01 and 02 as instance numbers!

[Former Member]

Hi Barry, can you help me with this question:

I have development system with sid DEV and instance number for example 05. I want to install another develop. system for migration/system copy. Can this new system have the same sid: DEV - like real develop. system?? Instance number can be for example 06.

I don't want that test system somehow mess up real dev system because they have same SID. Both system will be on same domain. Thanks.

[Former Member]

they can have the same SID, however should be

- installed on seperate hardware (otherwise they will colide on OS level)

- not be connected to eachother (via RFC, http, TMS, etc.).

- should use local users instead of domain users (if this is Windows environment)

So it can be done, but please be carefull.

[Former Member]

Hi Barry,

From your explanation what i understood is :

Sap products like SRM, CRM, R/3 etc. will have their individual unique SIDs while the instances (both central and other instances) will have their respective instance numbers.

am i correct?

Regards,

Dinesh.