How to change the default liveCache user in a connection

[SAPSupport]

In our system we use LIVECACHE.
In LCA, LDA and LEA connections, we use the default user who is specified when installing the livecache and this is the user SAP<SID>.
We want to change the user SAP<SID> to another one.

I have several questions related to how to implement this, if it possible:
1. Is there documentation on how to configure this?
2. What kind of user should it be?
3. What permissions/roles should this user have?
4. Is it necessary to restart the ABAP system or database when changing users?

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[SAPSupport · Accepted solution]

Two users are used for the liveCache. One is the DBM user (for example Control or DBM) and the other is the standard liveCache user (for example SAPR3 or SAP<SID>,
with SID being the system ID). Incorrect changes of the standard liveCache user can lead to data loss in the liveCache! You must follow below SAP note before
you change the standard liveCache user if this is required. The note contains the detailed steps on how to change the user.

1073954-Effects of changing the standard liveCache user