update with order by

Hi all

Does anyone know if "in order to" has the priority on "updates"? In other words, by using the following query. Will be sorted first and then locked resulting lines or they will be locked everything first, and then sorted?

SELECT / * + cardinality (para. 1) use_nl (al t) * / NULL
LOOSE COLLECTION l_nullvalue_list
TABLE (i_list), my_table t Al
WHERE al.id = t.id
ORDER BY t.id
FOR the UPDATE OF t.id;

Any help is appreciated.

Kind regards
WF

It is the case that I do not speak:

drop table t cascade constraints purge;
create table t as select rownum id, cast('x' as char(100)) pad
                    from dual connect by level <= 10000;

drop table t1 cascade constraints purge;
create table t1(id int);

-- 1st session
SQL> lock table t1 in exclusive mode;

Table(s) locked

-- 2nd session
declare
    type t1_type is table of rowid index by binary_integer;
    l_tab t1_type;
begin
    execute immediate 'lock table t1 in share mode';
    select rowid bulk collect into l_tab
      from t order by dbms_random.value
       for update;
end;
/

-- 3rd session
declare
    type t1_type is table of rowid index by binary_integer;
    l_tab t1_type;
begin
    execute immediate 'lock table t1 in share mode';
    select rowid bulk collect into l_tab
      from t order by dbms_random.value
       for update;
end;
/

Now 2nd & 3rd sessions are blocked by the 1st. We will release the lock:

-- 1st session
SQL> commit;

Commit complete

2nd & 3rd sessions try to lock the rows of the table T, and fails one of the sessions with blocking:

declare
    type t1_type is table of rowid index by binary_integer;
    l_tab t1_type;
begin
    execute immediate 'lock table t1 in share mode';
    select rowid bulk collect into l_tab
      from t order by dbms_random.value
       for update;
end;

ORA-00060: deadlock detected while waiting for resource
ORA-06512: at line 7

If you repeat the same scenario with ORDER BY id, then a session will wait to enqueue.
So, it's all on the order in which the row locks are acquired.

Tags: Database

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