Operators disallowed in a transaction

add_attributes()

add_instances()

add_user_to_role()

begin()

change_user()

create_namespace()

create_role()

create_user()

drop_namespace()

drop_role()

drop_user()

drop_user_from_role()

lock_arrays()

move_array_to_namespace()

remove()

remove_instances()

remove_versions()

rename()

set_role_permissions()

store() is disallowed if it would create a new array, but allowed if the destination is an existing array

_lock_one_array()

_verify_user()

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