On Fri, Jul 21, 2023 at 02:05:56PM +0800, Junwang Zhao wrote: > I noticed there are some places calling table_open with > RowExclusiveLock but table_close with NoLock, like in function > toast_save_datum. > > Can anybody explain the underlying logic, thanks in advance.
This rings a bell. This is a wanted behavior, see commit f99870d and its related thread: https://postgr.es/m/17268-d2fb426e0895a...@postgresql.org The tests added by this commit in src/test/isolation/ will show the difference in terms of the way the toast values get handled with and without the change. -- Michael
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