storage_spec

storage_spec 
      ::= 
      ( "initial" n [ "k" | "m" ] ) | ( "next" n [ "k" | "m" ] ) 
      | ( "minextents" n ) | ( "maxextents" n ) 
      | ( "pctincrease" n ) 
      | ( "optimal" ( "null" | ( n [ "k" | "m" ] ) ) ) 
      | ( "freelist" n ) 
      | ( "freelist" "groups" n ) 

This rule is called by

alter_cluster_spec
alter_index_spec
alter_rollback
alter_tablespace
create_cluster_spec
create_rollback
create_tablespace
index_storage
storage_parameter