DB_multiblock_read_count

Hi All,

 I am analysing db_multiple_read_count which is set to 64 currently.So what should be the block size on tablespace level ?Any syntax to create block size or change the block size for optimal performance.my memory details are below:--

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
sga_max_size                         big integer 4G
sga_target                           big integer 4G

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
pga_aggregate_target                 big integer 6G

SQL> select sum(bytes/1024/1024/1024) from dba_data_files;

SUM(BYTES/1024/1024/1024)
-------------------------
               1473.22961

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
__db_cache_size                      big integer 1392M
db_16k_cache_size                    big integer 0