1Z0-060中关于flash cache 的题目

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发表于2021-01-18 2184次查看

To enable the Database Smart Flash Cache, you configure the following parameters:

DB_FLASH_CACHE_FILE = ‘/dev/flash_device_1’, ‘/dev/flash_device_2’ DB_FLASH_CACHE_SIZE=64G

What is the result when you start up the database instance?

A. It results in an error because these parameter settings are invalid.

B. One 64G flash cache file will be used.

C. Two 64G flash cache files will be used.

D. Two 32G flash cache files will be used.

【解析】

此题目选择A，

Table 6-4 Database Smart Flash Cache Initialization Parameters

Parameter Description

Parameter	Description
`DB_FLASH_CACHE_FILE`	Specifies a list of paths and file names for the files to contain Database Smart Flash Cache, in either the operating system file system or an Oracle Automatic Storage Management disk group. If a specified file does not exist, then the database creates it during startup. Each file must reside on a flash device. If you configure Database Smart Flash Cache on a disk drive (spindle), then performance may suffer. A maximum of 16 files is supported.
`DB_FLASH_CACHE_SIZE`	Specifies the size of each file in your Database Smart Flash Cache. Each size corresponds with a file specified in `DB_FLASH_CACHE_FILE`. The files and sizes correspond in the order that they are specified. An error is raised if the number of specified sizes does not match the number of specified files. Each size specification must be less than or equal to the physical memory size of its flash device. The size is expressed as nG, indicating the number of gigabytes (GB). For example, to specify a 16 GB Database Smart Flash Cache, set `DB_FLASH_CACHE_SIZE` value to `16G`.

DB_FLASH_CACHE_FILE

Specifies a list of paths and file names for the files to contain Database Smart Flash Cache, in either the operating system file system or an Oracle Automatic Storage Management disk group. If a specified file does not exist, then the database creates it during startup. Each file must reside on a flash device. If you configure Database Smart Flash Cache on a disk drive (spindle), then performance may suffer. A maximum of 16 files is supported.

DB_FLASH_CACHE_SIZE

Specifies the size of each file in your Database Smart Flash Cache. Each size corresponds with a file specified in DB_FLASH_CACHE_FILE. The files and sizes correspond in the order that they are specified. An error is raised if the number of specified sizes does not match the number of specified files.

Each size specification must be less than or equal to the physical memory size of its flash device. The size is expressed as nG, indicating the number of gigabytes (GB). For example, to specify a 16 GB Database Smart Flash Cache, set DB_FLASH_CACHE_SIZE value to 16G.

参考文档

https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-memory.html#GUID-AA1EDDB2-203B-43DA-84D5-73FD7DF3ECE2

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