Ramanathan <sivakrishnat...@gmail.com> writes: > I propose modifying the use of an EXCLUSIVE lock during the backward scan > phase, then upgrading that lock to ACCESS EXCLUSIVE only for the actual > truncation phase. Since the truncation phase should be relatively quick, > the impact of the ACCESS EXCLUSIVE lock should be minimal.
Except that mid-transaction lock upgrades increase the risk of
deadlock failures.
regards, tom lane
