On Dec 2, 2015, at 10:29 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> The short answer is that heavyweight tuple locks can be taken internally
> by UPDATE, DELETE, and other row-level operations, and the specifics of
> which type of lock any given action takes are implementation details that
> can change from time to time.
Great, thank you!
--
-- Christophe Pettus
xof@thebuild.com
