DB_nk_CACHE_SIZE in oracle 10g r2

Hello everyone


Official document... Memory architecture


(1) how the logic applied here? I want to say 32 M how it came?


Memory consumed by components manually sizes reduced the amount of memory available for the automatic adjustment.

SGA_TARGET = 256M


DB_8K_CACHE_SIZE = 32M 

The instance has only 224 MB of memory (256-32) and

remaining to be allocated between the components of size automatically.

Thanks in advance. !

SQL> select component,current_size, granule_size from V$SGA_DYNAMIC_COMPONENTS;

COMPONENT                 CURRENT_SIZE GRANULE_SIZE
------------------------- ------------ ------------
shared pool                  411041792      4194304
large pool                     4194304      4194304
java pool                      4194304      4194304
streams pool                   4194304      4194304
DEFAULT buffer cache         230686720      4194304
KEEP buffer cache                    0      4194304
RECYCLE buffer cache                 0      4194304
DEFAULT 2K buffer cache              0      4194304
DEFAULT 4K buffer cache              0      4194304
DEFAULT 8K buffer cache              0      4194304
DEFAULT 16K buffer cache      33554432      4194304

COMPONENT                 CURRENT_SIZE GRANULE_SIZE
------------------------- ------------ ------------
DEFAULT 32K buffer cache             0      4194304
Shared IO Pool                       0      4194304
ASM Buffer Cache                     0      4194304

14 rows selected.

SQL> alter system set db_16k_cache_size=28M;
System altered.

SQL> select component,current_size, granule_size from V$SGA_DYNAMIC_COMPONENTS where component='DEFAULT 16K buffer cache';

COMPONENT                 CURRENT_SIZE GRANULE_SIZE
------------------------- ------------ ------------
DEFAULT 16K buffer cache      29360128      4194304   <-- Allocated 28M (Multiple of 4)

SQL> select component,current_size, granule_size from V$SGA_DYNAMIC_COMPONENTS where component='DEFAULT 16K buffer cache';

COMPONENT                 CURRENT_SIZE GRANULE_SIZE
------------------------- ------------ ------------
DEFAULT 16K buffer cache      29360128      4194304   <-- Allocated 32M (Multiple of 4)

SQL> alter system set db_16k_cache_size=30M;
System altered.

SQL> select component,current_size, granule_size from V$SGA_DYNAMIC_COMPONENTS where component='DEFAULT 16K buffer cache';

COMPONENT                 CURRENT_SIZE GRANULE_SIZE
------------------------- ------------ ------------
DEFAULT 16K buffer cache      33554432      4194304   <-- Allocated 32M (Multiple of 4)

SQL> alter system set db_16k_cache_size=31M;
System altered.

SQL> select component,current_size, granule_size from V$SGA_DYNAMIC_COMPONENTS where component='DEFAULT 16K buffer cache';

COMPONENT                 CURRENT_SIZE GRANULE_SIZE
------------------------- ------------ ------------
DEFAULT 16K buffer cache      33554432      4194304  <-- Allocated 32M (Multiple of 4)

As you can see the db_16k_cache_size is always allocated in pellet-sized pieces (4M). Despite setting the size to 30 M, 31 M, 32M, it will always allocate 32 M.

Hope this is clear.

Kind regards

Suntrupth

Tags: Database

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