OCP 1Z0 052 13

13. 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

Why is the value set to 4194304 and not to 2516582?

A.because 4194304 is the granule size

B.because 4194304 is the standard block size

C.because 4194304 is the largest nonstandard block size defined in the database

D.because 4194304 is the total size of data already available in the database buffer cache

Answer: A

SQL> SHOW PARAMETER DB_CACHE_SIZE
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_cache_size                        big integer 0

SQL> SELECT bytes/1024/1024 FROM v$sgainfo WHERE NAME = 'Granule Size';
BYTES/1024/1024
---------------
8
1 row selected

SQL> alter system set db_cache_size=2516582;
System altered

SQL> SHOW PARAMETER DB_CACHE_SIZE
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_cache_size                        big integer 8M