question about 'PX SEND RANGE.

When creating an index at the same time, a step in the plan is like 'PX SEND RANGE', my question is how oracle know how to divide the data in a different range to distribute the data to each slave? Suppose I have a column with asymmetric data, 90% of the data are of the order of 1,100, and the remaining 10% are of the order of 100.1, 000, 000. When to run 4 parallel, oracle will send the data of 1,250 slave 1 k and 250 k + 1... 500 k to slave 2 etc. ?

I tried to trace it "set events 10391 alter trace name context of session forever, level 128';", but no information on how oracle divide the range of the data.

test case to display the map
drop table tt;
create the table tt (a int);
insertion in a select rownum of double connect by rownum < 1000000;
commit;
explain plan for create index tt_ix on tt (a) parallel 2;
Select * from table (dbms_xplan.display);

------------------------------------------------------------------------------------------------------------------
| Id  | Operation                | Name     | Rows  | Bytes | Cost (%CPU)| Time     |    TQ  |IN-OUT| PQ Distrib |
------------------------------------------------------------------------------------------------------------------
|   0 | CREATE INDEX STATEMENT   |          |    82 |  1066 |     3   (0)| 00:00:01 |        |      |            |
|   1 |  PX COORDINATOR          |          |       |       |            |          |        |      |            |
|   2 |   PX SEND QC (ORDER)     | :TQ10001 |    82 |  1066 |            |          |  Q1,01 | P->S | QC (ORDER) |
|   3 |    INDEX BUILD NON UNIQUE| TT_IX    |       |       |            |          |  Q1,01 | PCWP |            |
|   4 |     SORT CREATE INDEX    |          |    82 |  1066 |            |          |  Q1,01 | PCWP |            |
|   5 |      PX RECEIVE          |          |    82 |  1066 |     2   (0)| 00:00:01 |  Q1,01 | PCWP |            |
|   6 |       PX SEND RANGE      | :TQ10000 |    82 |  1066 |     2   (0)| 00:00:01 |  Q1,00 | P->P | RANGE      |
|   7 |        PX BLOCK ITERATOR |          |    82 |  1066 |     2   (0)| 00:00:01 |  Q1,00 | PCWC |            |
|   8 |         TABLE ACCESS FULL| TT       |    82 |  1066 |     2   (0)| 00:00:01 |  Q1,00 | PCWP |            |
------------------------------------------------------------------------------------------------------------------

user646745 wrote:
When creating an index at the same time, a step in the plan is like 'PX SEND RANGE', my question is how oracle know how to divide the data in a different range to distribute the data to each slave? Suppose I have a column with asymmetric data, 90% of the data are of the order of 1,100, and the remaining 10% are of the order of 100.1, 000, 000. When to run 4 parallel, oracle will send the data of 1,250 slave 1 k and 250 k + 1... 500 k to slave 2 etc. ?

Before tackling the parallel operation of the co-ordinator query probably executes a "store" where it samples a few blocks of data to see what it looks like and to pronounce on the beaches based on the sample.

You can check if it happens by querying v$ pq_tqstat once the build is complete - there is an example of very old code on my website at http://www.jlcomp.demon.co.uk/pqcosts.html if you run the query, I think you'll find a line showing with server_type = "RANGER" and indications that he examined a small number of lines.

(From sample can be very bad--especially if the data set is already sorted: I think that Christo Kutrovsky of Pythian may have written a note on the problem, and Oracle has addressed in part in newer versions)

Concerning
Jonathan Lewis

Tags: Database

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