SYSE.33:4.4 - Provide isolation, lifetime and assistance

Give each independent attempt enough isolation to protect the meaning of its work. This may concern files, database rows, queues, network names or whole resources. Shared use is possible when the interference conditions are understood and controlled.

Set an appropriate lifetime and an actual holder for maintenance, assistance and disposition of retained information. A temporary environment must not disappear in the middle of promised work merely because a default expiry was reached. Conversely, indefinite retention of unused environments consumes resources and can preserve unnecessary access.

Limit cleanup to the resources and data actually owned by that environment and authorized for removal. If ownership or retained-data consequences are uncertain, return the uncertainty before deleting. A broad naming convention alone is not proof that every matching resource belongs to the current attempt.