You have installed two 64G flash devices to support the Database Smart Flash Cache feature on
your database server that is running on Oracle Linux.
You have set the DB_SMART_FLASH_FILE parameter:
DB_FLASH_CACHE_FILE= ‘/dev/flash_device_1 ‘,’ /dev/flash_device_2’
How should the DB_FLASH_CACHE_SIZE be configured to use both devices?
A.
Set DB_FLASH_CACHE_ZISE = 64G.
B.
Set DB_FLASH_CACHE_ZISE = 64G, 64G
C.
Set DB_FLASH_CACHE_ZISE = 128G.
D.
DB_FLASH_CACHE_SIZE is automatically configured by the instance at startup.
Explanation:
* SyntaxDB_FLASH_CACHE_SIZE = integer [K | M | G]DB_FLASH_CACHE_SIZE specifies the size of the Database Smart Flash Cache (flash cache).
This parameter may only be specified at instance startup. You can dynamically change this
parameter to 0 (disabling the flash cache) after the database is started. You can re-enable flash
cache by setting this parameter to the original value when the database was started. Dynamic
resizing of DB_FLASH_CACHE_SIZE or re-enabling flash cache to a different size is not
supported.
* DB_FLASH_CACHE_FILE filename for the flash memory or disk group representing a collection
of flash memory.
Specifying this parameter without also specifying the DB_FLASH_CACHE_SIZE initialization
parameter is not allowed.
certainly B
of course B
=> B
DB_FLASH_CACHE_SIZE specifies the size of the Database Smart Flash Cache (flash cache). This parameter may only be specified at instance startup.
You can specify up to 16 file sizes, for each of the flash memory devices specified with DB_FLASH_CACHE_FILE. For example, if there are three flash raw devices, you can specify the sizes of each device as follows:
db_flash_cache_file = /dev/raw/sda, /dev/raw/sdb, /dev/raw/sdc
db_flash_cache_size = 32G, 32G, 64G
B is the correct answer
The DB_FLASH_CACHE_FILE parameter is used to identify the flash disks to be used by the Smart Flash Cache.
DB_FLASH_CACHE_FILE = /mnt/vdisk1, /mnt/vdisk2
The size of the individual disks is specified by the DB_FLASH_CACHE_SIZE parameter.
DB_FLASH_CACHE_SIZE = 1G, 1G
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