单项选择题
Examine the following command that is executed for the TRANSPORT table in the SH schema:
Which statement describes the significance of this command?（）
A. It collects statistics into the pending area in the data dictionary
B. It creates a virtual hidden column in the CUSTOMERS_OBE table
C. It collects statistics with AUTO_SAMPLE_SIZE for ESTIMATE_PERCENT
D. It creates a histogram to hold skewed information about the data in the columns
相关考题
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单项选择题
What is the output of this command?（）
A. A list of files that require a backup within 3 days
B. A list of files requiring more than 3 days of archivelogs to apply
C. A list of files that RMAN recommends be backed up only once in every three days, based on low volatility
D. A list of files for which a backup as already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them -
多项选择题
You are managing an Oracle Database 11g database with the ASM storage. The database is having big file tablespaces. You want files to open faster and less memory to be used in the shared pool to manage the extent maps. What configuration would you effect to achieve your objective? （）
A. Set the ASM compatibility attribute for the ASM disk group to 11.1.0.
B. Set the RDBMS compatibility attribute for the ASM disk group to 11.1.0.
C. Set the COMPATIBLE initialization parameter for the ASM instance to 11.1.0.
D. Set the COMPATIBLE initialization parameter for the database instance to 11.1.0. -
多项选择题
When executing a SQL workload, you choose to generate execution plans only, without collecting execution statistics. Which two statements describe the implications of this?（）
A. It produces less accurate results of the comparison analysis.
B. It automatically calls the SQL Tuning Advisor for recommendations.
C. It shortens the time of execution and reduces the impact on system resources.
D. Only the changes in the execution plan, and not performance regression, are detected.
