Oracle
1Z0-883 · Question #45
1Z0-883 Question #45: Real Exam Question with Answer & Explanation
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Question
Consider the following: Mysql> EXPLAIN SELECT * FROM City WHERE Name =
Jacksonville' AND CountryCode = USA' \G ******************************** 1. row ******************************** Id: 1 Select_type: SIMPLE Table: City Type: ref Possible_keys: name_country_index Key: name_country_index Ref: const, const Rows: 1 Extra: Using where Which statement best describes the meaning of the value for the key_len column?Options
- AIt shows the total size of the index row.
- BIt shows how many columns in the index are examined.
- CIt shows the number of characters indexed in the key.
- DIt shows how many bytes will be used from each index row.
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