The supremum record in index page

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The supremum record represents a key higher than any possible key in the page. Its “next record” pointer is always zero (which represents NULL, and is always an invalid position for an actual record, due to the page headers). The “next record” pointer of the user record with the highest key on the page always points to supremum.

PS:在index page中，最大key值的next record总是指向supermum.