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EXPLAIN has output with MATCHCOLS = 0. What does it mean?

Question Posted / guest

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EXPLAIN has output with MATCHCOLS = 0. What does it mean?..

Answer / andank

When MATCHCOLS is 0, the access method is called a Non-
Matching Index Scan.


In the Non-Matching Index Scan, all the index keys and
their RIDs are read. Basically DB2 reads the full index
for that query.

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EXPLAIN has output with MATCHCOLS = 0. What does it mean?..

Answer / s

Non-matching index scan

Is This Answer Correct ?    3 Yes 2 No

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