SGA granule size

Question

If SGA_MAX_SIZE <= 128 mb, granule size will be 4 mb
If SGA_MAX_SIZE > 128 mb, granule size will be 16 mbMy SGA size is 360M
SQL> show parameter SGA_MAX_SIZE
NAME                                 TYPE        VALUE
sga_max_size                         big integer 360M
SQL> Then why the size of a granule is 4MB?
SQL> SELECT COMPONENT, GRANULE_SIZE/(1024*1024) "GRANULE_SIZE(Mb)" FROM V$SGA_DYNAMIC_COMPONENTS;
COMPONENT                                                        GRANULE_SIZE(Mb)
shared pool                                                                     4
large pool                                                                      4
java pool                                                                       4
streams pool                                                                    4
DEFAULT buffer cache                                                            4
KEEP buffer cache                                                               4
RECYCLE buffer cache                                                            4
DEFAULT 2K buffer cache                                                         4
DEFAULT 4K buffer cache                                                         4
DEFAULT 8K buffer cache                                                         4
DEFAULT 16K buffer cache                                                        4
DEFAULT 32K buffer cache                                                        4
Shared IO Pool                                                                  4
ASM Buffer Cache                                                                4
14 rows selected
SQL> Shouldn't have been 16?...

Answer 1

user12045475 wrote:
Hi,
your doc. is for 9i
for 10g and forward
If SGA_MAX_SIZE <= 1GB, granule size will be 4 mb
If SGA_MAX_SIZE > 1GB, granule size will be 16 mbHTHThis is not correct. You need to test for your release and platform.orcl> SELECT COMPONENT, GRANULE_SIZE/(1024*1024) "GRANULE_SIZE(Mb)" FROM V$SGA_DYNAMIC_COMPONENTS;
COMPONENT                                                        GRANULE_SIZE(Mb)
shared pool                                                                     8
large pool                                                                      8
java pool                                                                       8
streams pool                                                                    8
DEFAULT buffer cache                                                            8
KEEP buffer cache                                                               8
RECYCLE buffer cache                                                            8
DEFAULT 2K buffer cache                                                         8
DEFAULT 4K buffer cache                                                         8
DEFAULT 8K buffer cache                                                         8
DEFAULT 16K buffer cache                                                        8
DEFAULT 32K buffer cache                                                        8
Shared IO Pool                                                                  8
ASM Buffer Cache                                                                8
14 rows selected.
orcl> sho parameter sga_max_size
NAME                                 TYPE        VALUE
sga_max_size                         big integer 1104M
orcl> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for 32-bit Windows: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
orcl>