sql - Oracle - What is storage clause in altering a constraint statement -


i have sql block create primary key constraint , in sql statement found clause

storage initial

i couldn't understand , reason putting it, can tell me storage initial means when comes creating constraint or index in oracle. 

alter table table_name add constraint constraint_name .... .... storage initial

as explained in oracle documentation, if constraint requires index, clause allows defining how should physically stored (initial extent size...).


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