When DOS 5.0 and later runs with DOS=UMB, there will be not one but two memory arenas (assuming that UMBs are actually available). The AllocOper function (58h) was significantly extended to support UMBs.
https://www.tigerdata.com/blog/what-is-toast-and-why-it-isnt-enough-for-data-compression-in-postgres
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