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Oracle SQL: Physical attributes and storage clause

create table tq84_x (a number) PCTFREE 0;

create table tq84_y (a number)
   pctfree 20
   storage (
      minextents     10
      maxextents    100
   )
;

Physical attribute clause

The physical attribute clause allows to specify the following values:
pctfree
pctused Ignored in tablespaces with automatic segment space management (ASSM)
initrans
storage clause

Storage clause

The storage clause allows to specify the storage related characteristics of segments (i. e. the allocated sizes of extents etc);
initial The size of the first extent when a segment is created. This value is used differently and in conjunction with other values depending on the tablespace's extent manegment configuration.
next The size of the next extent. This value is used differently …
minextents In locallly managed tablespaces, the value is used in conjunction with pctincrease, initial and next.
maxextents Only meaningful in dictionary managed tablespaces.
pctincrease In locally managed tablespaces, this value is used to determine the initial segment size.
freelists Ignored in tablespaces with ASSM
freelist groups Ignored in tablespaces with ASSM
optimal Only relevent for rollback segments.
buffer_pool keep, recycle or default
flash_cashe
cell_flash_cashe
encrypt Can only be used when creating a tablespaces
maxsize clause
The error message ORA-02143: invalid STORAGE option indicates that only the following values can be specified in they storage clause:

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