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HDFS 默认 Block Size()
A32MB
B64MB
C128MB
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A system administrator is attempting to restore some files from a backup tape. The restore failed. The system administrator suspects the block size of the tape drive is incorrect. Which of the following commands can be used to determine the block size of the backup tape？（）A、ddB、tarC、cpioD、restore
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A specialist is monitoring performance on a server. The data is on another partition within the same array as the OS. The following information is available： （1）The average record written to disk is 16KB （2）The I/O block size is 2KB （3）The stripe size on the RAID array is 16KB Which of the following will improve performance without rebuilding the operating system？（）A、Change the I/O block size to match the RAID Stripe size.B、Change the RAID stripe size to match the I/O block size.C、Change the record size of the database to match the RAID stripe size.D、Change the record size of the database to match the I/O transfer rate.
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An administrator trying to restore a backup from tape encounters read errors. The administrator suspects that it could be an issue with the block device. What is the appropriate method to resolve this issue？（） A、Set the block size to 0.B、Read the tape using the tctl command.C、Use the ’cpio’ command to override tape device settings.D、Run the ’dd’ command to identify the block size from the tape.
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The database has the data block size set to 8 KB. You need to import a tablespace with a 4 KB block size into the database. Which additional memory parameter（s） should be configured to perform a transportable tablespace import？（）A、 DB_4K_CACHE_SIZE onlyB、 DB_8K_CACHE_SIZE onlyC、 DB_BLOCK_SIZE and DB_4K_CACHE_SIZED、 DB_BLOCK_SIZE and DB_8K_CACHE_SIZEE、 SGA_TARGET and DB_4K_CACHE_SIZEF、 DB_CACHE_SIZE only
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Your database block size is 4 KB. In this database， you are required to create a tablespace with a block size of 8 KB. Which is the prerequisite for creating this tablespace？（）A、 The parameter DB_CACHE_SIZE must be a multiple of 8.B、 The value of the parameter SGA_MAX_SIZE must be increased.C、 The tablespace must be created with a uniform extent size of 8 KBD、 The parameter DB_8K_CACHE_SIZE must be defined in the parameter file.
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You have executed this command to change the size of the database buffer cache： SQL ALTER SYSTEM SET DB_CACHE_SIZE=2516582； System altered. To verify the change in size， you executed this command： SQL SHOW PARAMETER DB_CACHE_SIZE NAME TYPE VALUE ------------------- ----------- ------------------ db_cache_size big integer 4194304 （4M） Why is the value set to 4194304 and not to 2516582（）A、because 4194304 is the granule sizeB、because 4194304 is the standard block sizeC、because 4194304 is the largest nonstandard block size defined in the databaseD、because 4194304 is the total size of data already available in the database buffer cache
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关于Block和Split两个概念，下面说法错误的是（）A、Block是HDFS中最小的数据存储单位B、Split是MapReduce中最小的计算单元C、Block与Split是一一对应关系D、Block和Split之间对应关系是任意的，可由用户控制
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单选题View the Exhibit. You want to create a tablespace to contain objects with block size 16 KB. But while configuring the storage you find that the block size that you can provide is only 8 KB. Which configuration couldhave enabled the block selection of 16 KB（）A
Choosing the extent allocation type to uniformB
Choosing the Segment Space Management option to manualC
Setting autoextension on for the data file mentioned for the tablespaceD
Setting the DB_16K_CACHE_SIZE parameter for the database instance to a nonzero value
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单选题You have executed this command to change the size of the database buffer cache： SQL ALTER SYSTEM SET DB_CACHE_SIZE=2516582； System altered. To verify the change in size， you executed this command：SQL SHOW PARAMETER DB_CACHE_SIZENAME TYPE VALUE ------------------- ----------- ------------------ db_cache_size big integer 4194304 Why is the value set to 4194304 and not to 2516582（）A
Because 4194304 is the granule sizeB
Because 4194304 is the standard block sizeC
Because 4194304 is the largest nonstandard block size defined in the databaseD
Because 4194304 is the total size of data already available in the database buffer cache
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单选题The database has the data block size set to 8 KB. You need to import a tablespace with a 4 KB block size into the database. Which additional memory parameter（s） should be configured to perform a transportable tablespace import？（）A
DB_4K_CACHE_SIZE onlyB
DB_8K_CACHE_SIZE onlyC
DB_BLOCK_SIZE and DB_4K_CACHE_SIZED
DB_BLOCK_SIZE and DB_8K_CACHE_SIZEE
SGA_TARGET and DB_4K_CACHE_SIZEF
DB_CACHE_SIZE only
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单选题Your database block size is 4 KB. In this database， you are required to create a tablespace with a block size of 8 KB. Which is the prerequisite for creating this tablespace？（）A
The parameter DB_CACHE_SIZE must be a multiple of 8.B
The value of the parameter SGA_MAX_SIZE must be increased.C
The tablespace must be created with a uniform extent size of 8 KBD
The parameter DB_8K_CACHE_SIZE must be defined in the parameter file.
考题
(难度：中等)因为hdfs上的文件会按block size进行拆分，所以Hbase的region大小不需要管理，1张表只设置1个region即可。
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