analyze table compute statistics for all indexes : Analyze « SQL Plus « Oracle PL / SQL






  1. Oracle PL / SQL
  2. SQL Plus
  3. Analyze

analyze table compute statistics for all indexes

  
SQL>  set serveroutput on
SQL>  set echo on
SQL>
SQL>
SQL>  create table t
  2     ( x, y null, primary key (x) )
  3     as
  4     select rownum x, username
  5      from all_users
  6      where rownum <= 100;

Table created.

SQL>
SQL>  analyze table t compute statistics;

Table analyzed.

SQL>
SQL>
SQL>  analyze table t compute statistics for all indexes;

Table analyzed.

SQL>
SQL>
SQL>  set autotrace on explain
SQL>
SQL>  select count(y) from t where x < 50;
  COUNT(Y)
----------
        14

1 row selected.


Execution Plan
--------------------------------------------------
Plan hash value: 2966233522

--------------------------------------------------
-------------------------

| Id  | Operation          | Name | Rows  | Bytes
| Cost (%CPU)| Time     |

--------------------------------------------------
-------------------------

|   0 | SELECT STATEMENT   |      |     1 |     8
|     2   (0)| 00:00:01 |

|   1 |  SORT AGGREGATE    |      |     1 |     8
|            |          |

|*  2 |   TABLE ACCESS FULL| T    |    14 |   112
|     2   (0)| 00:00:01 |

--------------------------------------------------
-------------------------


Predicate Information (identified by operation id)
:

--------------------------------------------------
-


   2 - filter("X"<50)

SQL>
SQL>  drop table t;

Table dropped.

SQL>
SQL>  set autotrace off
SQL> --








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