Find the latest ignored issue of an attribute

Oracle DB 12.1.2

A large table, I need to find the last ignored an attribute number. For example, consider this test scenario:

drop table

create table no matter what)

number of ukeyd);

insert into some(ukeyd) values (1);

insert into some(ukeyd) values (1); - Yes number can repeat

insert into some(ukeyd) values (3);

insert into some(ukeyd) values (5); - Yes gaps can be greater than 1 number

insert into some(ukeyd) values (10);

The result should be: 9

And I could do with this code:

Select max (missing) in)

Select min_ukeyd - 1 + level missing

of (min (ukeyd) select min_ukeyd)

max (ukeyd) max_ukeyd

of whatever

)

connect by level < = max_ukeyd - min_ukeyd + 1

less

Select ukeyd

of whatever

);

However, in my table that has records of 150 M, I get this error:

ORA-30009: not enough memory to CONNECT BY operation

Can anyone think solution that would work with large table?

SQL> ed
Wrote file afiedt.buf                                  

  1  select max(ukeyd) - 1 from
  2  (select ukeyd, lag(ukeyd) over (order by ukeyd) u
  3  from whatever)
  4* where u is not null and u + 1 != ukeyd
SQL> /                                                  

MAX(UKEYD)-1
------------
          9

I'm just now to make a table with a few tens of millions of lines to see how it behaves and this pics... more to come Oracle plan.

Tags: Database

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