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Instead of emitting a separate WAL XLOG_HEAP2_VISIBLE record for setting bits in the VM, specify the VM block changes in the XLOG_HEAP2_MULTI_INSERT record. This halves the number of WAL records emitted by COPY FREEZE. Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Kirill Reshke <reshkekirill@gmail.com> Discussion: https://postgr.es/m/flat/CAAKRu_ZMw6Npd_qm2KM%2BFwQ3cMOMx1Dh3VMhp8-V7SOLxdK9-g%40mail.gmail.com