單項選擇題

Which of the following is a potential performance tuning recommendation from the SQL Access Advisor？（）

A. Create new indexes.
B. Modify existing indexes.
C. Implement partitioning on a nonpartitioned table.
D. Create materialized views.
E. All of the above

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單項選擇題

Which of these appropriately describes the results of a manual SQL Tuning Advisor task？（）

A. A list of SQL statements and recommendations for tuning
B. A list of SQL statements that have been tuned by the Advisor，with before and after metrics
C. Graphs showing the actual performance improvement made by the Advisor after it implemented the recommended changes
D. All of the above

單項選擇題

You want to track and store all transactional changes to a table over its lifetime. To accomplish this task, you enabled Flashback Data Archive with the retention of 5 years. After some time, the business requirement changed and you are asked to change the retention period from 5 years to 3 years. To accomplish this, you issued the following command:
ALTER FLASHBACK ARCHIVE fla1 MODIFY RETENTION 3 YEARS;
What is the outcome of this command?（）

A. The command produces an error because the retention period cannot be reduced
B. All historical data older than 3 years is purged from the flashback archive FLA1
C. All historical data is retained but the subsequent flashback data archives are maintained for only 3 years
D. All historical data is transferred to flashback logs and the flashback archive is refreshed to set a new retention time

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Which of the following is a potential performance tuning recommendation from the SQL Access Advisor？（）

你可能感興趣的試題

Which of these appropriately describes the results of a manual SQL Tuning Advisor task？（）

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Which of the following is a potential performance tuning recommendation from the SQL Access Advisor？（）

Which of these appropriately describes the results of a manual SQL Tuning Advisor task？（）