I have read that mongodb memory maps all the data to RAM or main memory. That is all reads and write are directed to the RAM. And after every 100ms or so, is written to the disk. But even RDBMS uses pages of size 8KB and does the same. SO why do people consider memory mapped files and mongo as an advantage over RDBMS. I am not debating about other features of RDBMS vs mongo just this one storage feature.
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