Oracle
1Z0-888 · Question #76
1Z0-888 Question #76: Real Exam Question with Answer & Explanation
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Performance Tuning
Question
Consider:
mysql> EXPLAIN SELECT Name FROM Country WHERE Population BETWEEN 1 AND 10000\G
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: Country
type: range
possible_keys: Index_pop
key: Index_pop
key_len: 4
ref: NULL
rows: 10
Extra: Using where
Options
- AYou can use an index and return rows that fall within a range of values.
- BThe table will be scanned over a certain range of values.
- CThis type of index uses the range hash.
- DThere is a range of indexes that can be used.
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Topics
#EXPLAIN output#Index types#Query optimization#Execution plans