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Question and Answer

Connor McDonald

Thanks for the question, ravi.

Asked: November 10, 2015 - 10:45 pm UTC

Last updated: July 27, 2018 - 1:13 am UTC

Version: 11g

Viewed 10K+ times! This question is

You Asked

Hello,

Is there a way I could run explain plan on Oracle Live SQL? Apparently, it gives an error that PLAN_TABLE doesn't exist. I ran utlxplan.sql in my session but still could not execute statement

SELECT * FROM TABLE(DBMS_XPLAN.display)

Which gives an error

ERROR: an uncaught error in function display has happened; please contact Oracle support
Please provide also a DMP file of the used plan table PLAN_TABLE
ORA-00904: DBMS_XPLAN_TYPE_TABLE: invalid identifier

Is this by design that we are blocked for doing explain plan?

Thanks!



and Connor said...

That is a *current* restriction. To provide isolation for all users, some facilities are currently blocked (eg dbms_xplan also lets you get the plan for anyone's cursor).

But you can still do explain into a PLAN_TABLE and use the old style query to get a plan output, ie along the lines of

SELECT ...
  FROM PLAN_TABLE
CONNECT BY prior id = parent_id
        AND prior statement_id = statement_id
  START WITH id = 0
        AND statement_id = 'XXX'
  ORDER BY id;


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Comments

Thanks!

ravi B, November 11, 2015 - 1:30 am UTC

Thanks!

Will be available?

Duke Ganote, November 27, 2017 - 3:59 pm UTC

It was a pleasant surprise to log into liveSQL today and get the explain plan (below); any chance we can get actuals?

explain plan for select * from scott.emp;
select * from table(dbms_xplan.display);

PLAN_TABLE_OUTPUT
Plan hash value: 3956160932
 
--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |    14 |   532 |     3   (0)| 00:00:01 |
|   1 |  TABLE ACCESS FULL| EMP  |    14 |   532 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------


Chris Saxon
November 27, 2017 - 5:09 pm UTC

You already can. See this script:

https://livesql.oracle.com/apex/livesql/file/content_FAQU2DYYI7N1RYDB5CR2Y98DD.html

lack privileges to run dbms_xplan

Jim Dickson, July 26, 2018 - 10:05 am UTC

Chris

In current version of Live Oracle SQL, when using you test code, I get following error:

PLAN_TABLE_OUTPUT
User has no SELECT privilege on V$SQL

Can you please confirm you get the same - or is there a way to workaround this issue?

jim
Connor McDonald
July 27, 2018 - 1:13 am UTC

Check out my blog post on the topic here

https://connor-mcdonald.com/2018/02/20/execution-plans-on-livesql/

This explains the why, and has a workaround.
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