多項選擇題

The EMP table has some discrepancy in data entry with a particular employee ID. You execute the query as shown in the Exhibit to retrieve all versions of the row that exist between two SCNs.View the Exhibit.
Which two statements about the results of the query shown in the Exhibit are correct? （）(Choose two.)

A. The LAST_SCN value in the first row is NULL, which means that the versions of the row still exist at SCN 6636300.
B. The LAST_SCN value in the second row in NULL, which means that the version of the row still exists at SCN 6636300.
C. The LAST_SCN value in the third row is 6636280, which means that the version of row exists above SCN 6636280.
D. The LAST_SCN value in the second row is NULL, which means that the version of the row no longer exists because it was deleted.

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多項選擇題

What recommendations does the SQL Access Advisor provide for optimizing SQL queries？（）

A. selection of SQL plan baselines
B. partitioning of tables and indexes
C. creation of index-organized tables
D. creation of bitmap， function-based，and B-tree indexes
E. optimization of materialized views for maximum query usage and fast refresh

單項選擇題

Before a Flashback Table operation, you execute the following command:
ALTER TABLE employees ENABLE ROW MOVEMENT;
Why would you need this to be executed?（）

A. Because row IDs may change during the flashback operation
B. Because the object number changes after the flashback operation
C. Because the rows are retrieved from the recycle bin during the flashback operation
D. Because the table is moved forward and back to a temporary during the flashback operation

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你可能感興趣的試題

What recommendations does the SQL Access Advisor provide for optimizing SQL queries？（）

Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）

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Before a Flashback Table operation, you execute the following command:
ALTER TABLE employees ENABLE ROW MOVEMENT;
Why would you need this to be executed?（）