Creation of tablespaces with non standard block size
The standard block size is the size of the default database block size which is specified by the parameter DB_BLOCK_SIZE. The other data block sizes that we create in the database are non standard block size.
When we create db_block_size of 8K or any size, oracle expects memory allocated to DB_CACHE_SIZE parameter. In the same manner, if we wanted to create a non standard block size of ‘n’ then oracle expects the memory size allocated to DB_CACHE_SIZE and DB_Nk_CAHCE_SIZE parameter where n is equal to the ‘n’ in the non standard block size.
Note: For ‘n’ the possible values are 2, 4, 6, 8, 16, 32 etc..

SQL> create tablespace test_ts
2 datafile 'd:\tablespacetest.dbf'
3 blocksize 16k;
create tablespace test_ts
*
ERROR at line 1:
ORA-29339: tablespace block size 16384 does not match configured block sizes

SQL> alter system set db_16k_cache_size=1M
SQL> /
System altered.

SQL> create tablespace test_ts
2 datafile 'd:\tablespacetest.dbf'
3 size 200k
4* blocksize 16k
SQL> /
Tablespace created.
Note: if we wish to create a non standard block size of 4k then there should be a memory allocated to DB_4K_CACHE_SIZE parameter. This rule applies to all the non standard block sizes.