DML commands that modify tables in the shared IQ store are global DML
commands. Any transaction that contains a global DML command becomes a global
transaction.
You can run global transactions from the coordinator and any write server.
Global DML Commands
Global DML commands behave as if they were executed on the coordinator, and obey the same locking rules as on a single server.
Table Data Scope
When running DML commands in multiplex, the visibility of the table rows differs for different table types.