No Predicate Information showing in typical display

Question

same sql statement, in other environment, when I display plan with dbms_xplan, it shows predicate information, only in one environment, not showing, even I used ALL option, compared two environment, there is no difference, what is could be possible reason for this? Thanks in advance.

Answer 1

user8918387 wrote:
plan_table is not old version.Welcome to the forum.
That is good to hear that the PLAN_TABLE is the not the old version. If possible, I would like to see a reproducible test case using the following script:
SET LINESIZE 140
SET TRIMSPOOL ON
SET PAGESIZE 1000
SELECT /*+ GATHER_PLAN_STATISTICS */
  1 MY_VALUE
FROM
  DUAL
WHERE
  ROWNUM<=1;
SELECT
FROM
  TABLE(DBMS_XPLAN.DISPLAY_CURSOR(NULL,NULL,'ALLSTATS LAST +NOTE'));When I execute the above, this is what I see:
SQL> SELECT /*+ GATHER_PLAN_STATISTICS */
  2    1 MY_VALUE
  3  FROM
  4    DUAL
  5  WHERE
  6    ROWNUM<=1;
  MY_VALUE
         1
SQL>
SQL> SELECT
  2    *
  3  FROM
  4    TABLE(DBMS_XPLAN.DISPLAY_CURSOR(NULL,NULL,'ALLSTATS LAST +NOTE'));
PLAN_TABLE_OUTPUT
SQL_ID  a9wsgk0qtb83c, child number 0
SELECT /*+ GATHER_PLAN_STATISTICS */   1 MY_VALUE FROM   DUAL WHERE
ROWNUM<=1
Plan hash value: 3227170792
| Id  | Operation        | Name | Starts | E-Rows | A-Rows |   A-Time   |
|   0 | SELECT STATEMENT |      |      1 |        |      1 |00:00:00.01 |
|*  1 |  COUNT STOPKEY   |      |      1 |        |      1 |00:00:00.01 |
|   2 |   FAST DUAL      |      |      1 |      1 |      1 |00:00:00.01 |
Predicate Information (identified by operation id):
   1 - filter(ROWNUM<=1)
13 rows selected.When you post the output, use a { code } tag before and after the output so that the spaces in the explain plan test are retained (do not include the space on either side of the word code). For example:
{ code } (do not include the space between the bracket and the word code)
| Id  | Operation        | Name | Starts | E-Rows | A-Rows |   A-Time   |
|   0 | SELECT STATEMENT |      |      1 |        |      1 |00:00:00.01 |
|*  1 |  COUNT STOPKEY   |      |      1 |        |      1 |00:00:00.01 |
|   2 |   FAST DUAL      |      |      1 |      1 |      1 |00:00:00.01 |
Predicate Information (identified by operation id):
   1 - filter(ROWNUM<=1){ code }
Charles Hooper
Co-author of "Expert Oracle Practices: Oracle Database Administration from the Oak Table"
http://hoopercharles.wordpress.com/
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.
Edited by: Charles Hooper on May 31, 2010 11:51 AM
Original test case did not specify a WHERE clause - fixed now.