Bruce Momjian wrote:
How do vendors actually implement auto-clustering?  I assume they move
rows around during quiet periods or have lots of empty space in each
value bucket.


IIRC informix doesn't have it, and you have to recluster periodically the table. After having clustered the table with an index in order to recluster the table with another index you have to release the previous one ( ALTER index TO NOT CLUSTER ), the CLUSTER is an index attribute and each table can have only one index with that attribute ON.

Regards Gaetano Mendola

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