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Background documentation Search Conditions for Key Columns Locate the document in the library structure

If the SQL statement contains search conditions for key columns, the following search strategies can be used:

Search Condition

Search Strategy

Equality condition for every key column

The system accesses the corresponding table row(s) directly.

IN Condition for a key column; and an equality condition for all other key columns (all columns that precede the column with the IN condition in the key)

The system accesses the corresponding table row(s) directly.

Range conditions

Upper and lower limits for the valid key range are created for the key columns. All search strategies, including strategies using inversions, use the knowledge of this valid search range.

 

 

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