多选题Which statements are true regarding table compression? （）(Choose all that apply.)AIt saves disk space and reduces memory usage.BIt saves disk space but has no effect on memory usage.CIt incurs extra CPU overhead during DML as well as direct loading ope

第1题：

Which system resources does WLM have the capability to control?（）

• A、 CPU, Memory and Network I/O 
• B、 CPU, Memory and Disk I/O 
• C、 CPU and Memory 
• D、 CPU and Disk I/O

第2题：

Which of the following statements about declaration are true？（）         

• A、 Declaration of primitive types such as boolean， byte and so on does not allocate memory space for the variable.
• B、 Declaration of primitive types such as boolean， byte and so on allocates memory space for the variable.
• C、 Declaration of nonprimitive types such as String， Vector and so on does not allocate memory space for the object.
• D、 Declaration of nonprimitive types such as String， Vector ans so on allocates memory space for the object.

第3题：

Which statement is true regarding the Junos OS?（）

• A、Each process runs in its own protected memory space ensuring that one process cannot directly interfere with another.
• B、Processes share memory space but use separate ASICs so that one process cannot directly interfere with another.
• C、A central processor called the IP2 Chip dynamically assigns memory as process needs fluctuate.
• D、The memory management daemon (mmd) is responsible for allocating new memory for processes as they request it.

第4题：

Which statements are true regarding table compression？（）

• A、 It saves disk space and reduces memory usage.
• B、 It saves disk space but has no effect on memory usage.
• C、 It incurs extra CPU overhead during DML as well as direct loading operations.
• D、 It incurs extra CPU overhead during DML but not direct loading operations.
• E、 It requires uncompress operation during I/O.

第5题：

Which three statements are characteristic of the MEMORY storage engine?（）

• A、It can support transactions
• B、Table contents are not saved if the server is restarted
• C、It cannot contain text or BLOB columns
• D、It can support foreign keys
• E、Each table is represented on disk as an.frm file
• F、Each table has a corresponding.MYI and .MYD file

第6题：

You have a computer that runs Windows XP Professional. The computer has the following hardware installed: 3 GB page file, 2. 4 GHz processor, 2 GB of physical memory, 20 GB hard disk that has 1 GB of free space You need to enable hibernation support on the computer. What should you do first?（） 

• A、Upgrade the processor.
• B、Add additional physical memory.
• C、Increase the size of the page file.
• D、Create additional free hard disk space.

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第13题：

Given the following code fragment：     public void create（） {     Vector myVect；     myVect = new Vector（）；      }  Which of the following statements are true？（） 

• A、 The declaration on line 2 does not allocate memory space for the variable myVect.
• B、 The declaration on line 2 allocates memory space for a reference to a Vector object.
• C、 The statement on line 2 creates an object of class Vector.
• D、 The statement on line 3 creates an object of class Vector.
• E、 The statement on line 3 allocates memory space for an object of class Vector.

第14题：

Which statement is true regarding the Junos OS?（）

• A、Each process runs in its own protected memory space ensuring that one process cannot directly interface with another
• B、Process share memory space but separate ASICs so that one process cannot directly interfere with another
• C、A central processor called the IP2 chip dynamically assings memory as process needs fluctuate
• D、The memory management daemon (mmd) is responsible for allocating new memory for process as they request it

第15题：

Which two statements are true about setting the per-thread buffers higher than required?（）

• A、More memory per thread is beneficial in all scenarios
• B、It causes increased overhead due to initial memory allocation
• C、It can affect system stability during peak load times, due to swapping
• D、It requires increasing the thread_cache_size variable

第16题：

Which statement about the enabling of table compression in Oracle Database 11g is true?（）

• A、Compression can be enabled at the table, tablespace, or partition level for direct loads only.
• B、Compression can be enabled only at the table level for both direct loads and conventional DML.
• C、Compression can be enabled at the table, tablespace, or partition level for conventional DML only.
• D、Compression can be enabled at the table, tablespace, or partition level for both direct loads and conventional DML.

第17题：

You are using Recovery Manager (RMAN) to perform backups. In which three situations would you perform a compressed backup?（）

• A、You are backing up to tape and your tape device performs its own compression.
• B、You are making image copies, and you have not enabled tablespace compression.
• C、You are using disk-based backups and disk space in your Flash Recovery Area, or other disk-based backup destinations are limited.
• D、You are performing your backups to some device over a network where reduced network bandwidth is more important than CPU usage.
• E、You are using some archival backup media, such as CD or DVD, where reducing backup sizes saves  media costs and archival storage.

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