Il have a DB2 instance with 5 database.
3 of the 5 are used by the same application.
So I'm trying to backup these 3 DB in a single time. I need a synchoneous backup.

I don't know how to proceed in order to be sure that nobody will be able to write in one db making it inconsistent with the 2 others.

Do you have idea, script, process?

(I'm working with DB2 UDB, and I don't want to acquire any external tool licence)

In db2 the backup is the database level.I don't know how it can help,
but check quiesce with force connection.

regards,

mujeeb

During restore, you can rollforward these 3 DBs to the same Timestamp, then they will be sync.