多項(xiàng)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

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單項(xiàng)選擇題

You plan to use Flashback Drop feature to recover a dropped table SALES_EMP. No other table with the same name exists in the schema.You query RECYCLEBIN and find multiple entries for the SALES_EMP table as follows, You then issue the following statement to recover the table:
SQL> FLASHBACK TABLE sales_emp TO BEFORE DROP;
What would be the outcome of the precedent statement?（）

A. It retrieves the latest version of the table from the recycle bin
B. It retrieves the oldest version of the table from the recycle bin
C. It retrieves the version of the table for which undo information is available
D. It returns an error because the table name is not specified as per the names in the OBJECT_NAME column

多項(xiàng)選擇題

Which statements are true regarding SecureFile LOBs?（）

A. The amount of undo retained is user controlled.
B. SecureFile LOBs can be used only for nonpartitioned tables.
C. Fragmentation is minimized by using variable-sized chunks dynamically.
D. SecureFile encryption allows for random reads and writes of the encrypted data.
E. It automatically detects duplicate LOB data and conserves space by storing only one copy.