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Significats de index lookup en anglès

Encara no tenim significats per a "index lookup".
Ús de index lookup en anglès
1
An index lookup is used to satisfy the result of a subquery.
Mysql stored procedure programming
2
Apply the conditions to the index lookup operation to eliminate nonmatching rows.
High performance mysql, 2nd edition
3
This is an index lookup that MySQL knows will return at most a single value.
High performance mysql, 2nd edition
4
Secondary index accesses require two index lookups instead of one.
High performance mysql, 2nd edition
5
Why would a secondary index require two index lookups?
High performance mysql, 2nd edition
6
Essentially, any query that's not a single-table indexed lookup requires inter-node communication and therefore is slow.
High performance mysql, 2nd edition