Parallelize a procedure call

Is there a simple way to call a parallel procedure?

I wan't something like this:

declare

int l_first;

int l_second;

int l_third;

Start

l_first: = start_new_thread ('call my_procedure (1)');

l_second: = start_new_thread ('call some_procedure (2)');

l_third: = start_new_thread ('call some_procedure (3)');

join_thread (l_first);

join_thread (l_second);

join_thread (l_third):

end;

The variant when you create task, create pieces, run the task and after all you drop the task is not convenient I want to just run my procedure in new thread, I don't need to chunk of other tables by rowid or something else.

It seems that you want to use threading and not necessarily parallel processing.

The difference? Well, parallel processing takes a load of unique work and that at the same time (hence the need for segmentation of the workload). Threads can be performed in parallel of the different workloads - for example in a a Flight Simulator thread can do the rendering, another sound, another model flight, another weather model, etc.

And this (and other) announces, is seems you want to put on and treatment not specifically parallel.

We can implement as background process threads (aka jobs).  But unlike the typical Windows/Posix thread synchronization between threads and access for the threads data segment, are not really possible.

Here is an example of a class Thread base to be used in PL/SQL:

SQL> create or replace type TThread authid current_user as object(
  2          thread_code     varchar2(32767),
  3          job_id          integer,
  4
  5          constructor function TThread( plsqlCode varchar2, startImmediate boolean default true ) return self as result,
  6          member procedure StartThread(  self in out TThread ),
  7          member function ThreadCompleted return boolean
  8  );
  9  /

Type created.

SQL>
SQL> create or replace type body TThread as
  2
  3          constructor function TThread( plsqlCode varchar2, startImmediate boolean default true ) return self as result is
  4          begin
  5                  self.thread_code := plsqlCode;
  6                  if startImmediate then
  7                          self.StartThread();
  8                  end if;
  9                  return;
10          end;
11
12          member procedure StartThread( self in out TThread ) is
13                  pragma autonomous_transaction;
14          begin
15                  DBMS_JOB.Submit(
16                          job => self.job_id,
17                          next_date => sysdate,
18                          what => self.thread_code
19                  );
20                  commit;
21          exception when OTHERS then
22                  rollback;
23                  raise;
24          end;
25
26          member function ThreadCompleted return boolean is
27                  i       integer;
28          begin
29                  select 1 into i from user_jobs where job = self.job_id;
30                  return( false );
31          exception when NO_DATA_FOUND then
32                  return( true );
33          end;
34
35  end;
36  /

Type body created.

SQL>
SQL> declare
  2          thread1 TThread;
  3  begin
  4          thread1 := new TThread( 'dbms_lock.sleep(10);' );
  5          dbms_output.put_line( to_char(sysdate,'hh24:mi:ss')||': thread running as job '||thread1.job_id );
  6
  7          while not thread1.ThreadCompleted() loop
  8                  dbms_output.put_line( to_char(sysdate,'hh24:mi:ss')||': thread busy...' );
  9                  dbms_lock.sleep(1);
10          end loop;
11
12          dbms_output.put_line( to_char(sysdate,'hh24:mi:ss')||': thread completed' );
13
14  end;
15  /
07:52:50: thread running as job 767
07:52:50: thread busy...
07:52:51: thread busy...
07:52:52: thread busy...
07:52:53: thread busy...
07:52:54: thread busy...
07:52:55: thread busy...
07:52:56: thread busy...
07:52:57: thread busy...
07:52:58: thread busy...
07:52:59: thread busy...
07:53:00: thread busy...
07:53:01: thread busy...
07:53:02: thread busy...
07:53:03: thread completed

PL/SQL procedure successfully completed.

SQL>

Note that no validation is to ensure that the StartThread() method is not called repeatedly - this class is a simple test model that has yet to evolve before production use.

Tags: Database

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