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Status Not under consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Jun 27, 2022

RELATED IDEAS

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.

Needed By Not sure -- Just thought it was cool
  • Admin
    Karen Qualley
    Reply
    |     Jul 14, 2022

    After further discussions, it has been determined that these indexes are already more tightly packed than originally believed. Closing RFE as a result.

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