Oracle
1Z0-909 · Question #14
1Z0-909 Question #14: Real Exam Question with Answer & Explanation
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Performance
Question
Which two are true about indexes?
Options
- ASecondary index access will always be faster than a table scan.
- BIndexing all of a table's columns improves performance.
- CIndexes contain rows sorted by key values.
- DIndexes reduce disk space used.
- EIndexes are used to enforce unique constraints.
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Topics
#indexes#performance#query optimization#storage