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More efficient unique indexes for monotonically increasing keys and constraints
Currently an index on a SERIAL and other monotonically increasing keys only add to the last node in the index causing the node to split into two half filled nodes. Eventually a sufficient number of nodes have so split that the index's search efficiency is reduced for finding more recent keys which are the most likely to be searched for.
I propose a new CREATE UNIQUE INDEX option, call it something like NOSPLIT, that causes the index logic to just add a new empty node without splitting the existing node. Such indexes might also default to FILLFACTOR 100 at create time rather than the ONCONFIG setting if a FILLFACTOR option is not present in the DDL.
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