JDBC automatical query turned to be very slow

Question

I am maintaining an application creating an Oracle DB via JDBC. Starting from today this query:

SELECT  NULL                                                   AS         


        

Answer 1

I found this way to cheat.. run this as the user you connect with jdbc before you reverse engineer a schema..

CREATE TABLE all_constraints AS
  SELECT owner,
         constraint_name,
         constraint_type,
         table_name,
         r_owner,
         r_constraint_name,
         delete_rule,
         status,
         deferrable,
         deferred,
         validated,
         generated,
         bad,
         rely,
         last_change,
         index_owner,
         index_name,
         invalid,
         view_related
  FROM   all_constraints;

CREATE TABLE all_cons_columns AS
  SELECT *
  FROM   all_cons_columns;

CREATE INDEX ac1
  ON all_constraints (owner, constraint_name, table_name);

CREATE INDEX acc1
  ON all_cons_columns (owner, constraint_name, table_name);  

Then the query in question really screams.. the downside is you have to refresh it from time to time.. maybe make it a materialized view?