what is explain plan?, given an example...

Question Posted / shivainduja

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what is explain plan?, given an example.....

Answer / shivainduja

An explain plan is a representation of the access path that
is taken when a query is executed within Oracle.

SQL> explain plan for select * from emp2;

Explained.

SQL> select * from table (DBMS_XPLAN.display);

PLAN_TABLE_OUTPUT
-------------------------------------
Plan hash value: 2941272003

--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost
(%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 15 | 570 | 3
(0)| 00:00:01 |
| 1 | TABLE ACCESS FULL| EMP2 | 15 | 570 | 3
(0)| 00:00:01 |
--------------------------------------------------------------------------

8 rows selected.

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what is explain plan?, given an example.....

Answer / rajesh venati

this will also work.

An Explain Plan is a tool that you can use to have Oracle
explain to you how it plans on executing your query.

ex:-
SQL> set autotrace on explain
SQL> select * from emp;

Execution Plan
----------------------------------------------------------
Plan hash value: 3956160932

--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost
(%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 518 | 3
(0)| 00:00:01 |
| 1 | TABLE ACCESS FULL| EMP | 14 | 518 | 3
(0)| 00:00:01 |
--------------------------------------------------------------------------

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0 No

what is explain plan?, given an example.....

Answer / suresh somayajula

Explain Plan determines the execution plan of SQL statement.

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