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Asked: 2026-05-16T10:33:50+00:00

My current knowledge: Oracle does offer index-organized tables and defaults to heap-organized. I heard

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My current knowledge:

  • Oracle does offer index-organized tables and defaults to heap-organized.
  • I heard that SQL-Server uses only index-organized tables

I am especially interested in answers for MySQL, PostgreSQL, Informix and DB2.

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  1. Editorial Team

    MySql has clustered indexes but there appears to be limited control on these indexes.

    MySql clustered indexes and see this question here

    DB2 has MDC (multi-dimension cluster) which can effectively index organise the table in several ways. I’ve never used them but you can probably just have a single dimension MDC which would be the same as a standard clustered index.

    Oracle is a bit of a pain. Last time I checked with its IOT implementation requires you create the table as IOT and you can’t change it later, which is annoying when you want to load a load of data with no indexes for speed and then index it after.

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