Workarounds

Question

Hi,
Please suggest the workarounds for replacing /*+ bypass_ujvc*/ hint in oracle 11g.
Thanks & Rgds

Answer 1

user13325846 wrote:
Yes I understand this, I will not select the extra columns.
But is there any way to achieve this without creating primary key?Yes. The update simply needs to have a "proper" row to update - and can identify the row to update uniquely via the physical row identifier (address of row on disk).
For example - table dept2 is a copy of table dept, but does not contain any primary key or unique constraints.
SQL> create table dept2 nologging as select * from dept;
Table created.
SQL>
SQL> select * from dept2;
    DEPTNO DNAME          LOC
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON
SQL> update(
  2          select
  3                  d.dname
  4          from    dept2 d
  5          where   d.deptno in(
  6                          select distinct
  7                                  e.deptno
  8                          from    emp e
  9                          where   e.job = 'SALESMAN'
10                  )
11  )
12  set        dname = 'WEASELS';
1 row updated.
SQL>
SQL> select * from dept2;
    DEPTNO DNAME          LOC
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 WEASELS        CHICAGO
        40 OPERATIONS     BOSTON
SQL>