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Luis Rodriguez wrote:

I was checking a SQL sentence with Visual Explain and the Index
Advisor suggested an index with two columns, the first one being
*SUBQJ0001 (The second column already exists as an index)

Does anyone have an idea what this refers to?


The *XXXYY#### field names are internal naming for the database query engine, generally representative of an expression; i.e. any specific column name does not describe the derivation. The prefix SUBQ indicates the internal field is used to implement a subquery; possibly the J indicates a join [implementation] column of the subquery. The debug messages utilize similar naming prefixed with an asterisk, to indicate that the /column/ included in the advised or created-as temporary index was a derived expression; e.g. CPI432F & CPI4321 as I recall, where the latter mentions specifically the naming *MAP to indicate a derived field as result of an expression.

Regards, Chuck

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