Estimate the space of index utilized in oracle

Estimate the Space of Index utilized

Estimate the space Index will used
Find how much space a index will need for creating in the database. We can estimate it by package DBMS_SPACE.


Calculate the space utilized by dbms_space.create_index_cost procedure
Use the Create statement as first parameter in the procedure , second and third parameter will return the result.
It will return result in bytes.
Following are the example:

set serveroutput on
exec dbms_stats.gather_table_stats(user,'CUST');
variable used_bytes number
variable alloc_bytes number
exec dbms_space.create_index_cost( 'create index cust_idx2 on cust(first_name)', :used_bytes, :alloc_bytes);
print :used_bytes
print :alloc_bytes

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