Analyze index on varchar2 value and date type value : Analyze « SQL Plus « Oracle PL / SQL






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

Analyze index on varchar2 value and date type value

  

  
SQL>
SQL> create table t
  2  as
  3  select to_char( to_date('01-jan-1995','dd-mon-yyyy')+rownum, 'yyyymmdd' ) str_date,
  4         to_date('01-jan-1995','dd-mon-yyyy')+rownum date_date
  5    from all_objects
  6    where rownum < 20
  7  /

Table created.

SQL>
SQL> create index i1 on t(str_date);

Index created.

SQL>
SQL> create index t_date_date_idx on t(date_date);

Index created.

SQL>
SQL> analyze table t compute statistics
  2  for table
  3  for all indexes
  4  for all indexed columns;

Table analyzed.

SQL>
SQL> set autotrace on explain
SQL> select * from t
  2  where str_date between '20001231' and '20100101' and rownum < 20;

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 508354683

-----------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes | Cost  |
-----------------------------------------------------------
|   0 | SELECT STATEMENT   |      |     1 |    20 |     1 |
|*  1 |  COUNT STOPKEY     |      |       |       |       |
|*  2 |   TABLE ACCESS FULL| T    |     1 |    20 |     1 |
-----------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(ROWNUM<20)
   2 - filter("STR_DATE">='20001231' AND "STR_DATE"<='20100101')

Note
-----
   - cpu costing is off (consider enabling it)

SQL>
SQL> select * from t where date_date between to_date('20001231','yyyymmdd') and to_date('20100101','yyyymmdd') and rownum<20;

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 508354683

-----------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes | Cost  |
-----------------------------------------------------------
|   0 | SELECT STATEMENT   |      |     1 |    20 |     1 |
|*  1 |  COUNT STOPKEY     |      |       |       |       |
|*  2 |   TABLE ACCESS FULL| T    |     1 |    20 |     1 |
-----------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(ROWNUM<20)
   2 - filter("DATE_DATE">=TO_DATE('2000-12-31 00:00:00', 'yyyy-mm-dd
              hh24:mi:ss') AND "DATE_DATE"<=TO_DATE('2010-01-01 00:00:00',
              'yyyy-mm-dd hh24:mi:ss'))

Note
-----
   - cpu costing is off (consider enabling it)

SQL>
SQL>
SQL> select * from t
  2  where str_date between '20001231' and '20100101' and rownum<20;

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 508354683

-----------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes | Cost  |
-----------------------------------------------------------
|   0 | SELECT STATEMENT   |      |     1 |    20 |     1 |
|*  1 |  COUNT STOPKEY     |      |       |       |       |
|*  2 |   TABLE ACCESS FULL| T    |     1 |    20 |     1 |
-----------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(ROWNUM<20)
   2 - filter("STR_DATE">='20001231' AND "STR_DATE"<='20100101')

Note
-----
   - cpu costing is off (consider enabling it)

SQL>
SQL> select * from t where date_date between to_date('20001231','yyyymmdd') and to_date('20100101','yyyymmdd')
  2  and rownum < 20;

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 508354683

-----------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes | Cost  |
-----------------------------------------------------------
|   0 | SELECT STATEMENT   |      |     1 |    20 |     1 |
|*  1 |  COUNT STOPKEY     |      |       |       |       |
|*  2 |   TABLE ACCESS FULL| T    |     1 |    20 |     1 |
-----------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(ROWNUM<20)
   2 - filter("DATE_DATE">=TO_DATE('2000-12-31 00:00:00', 'yyyy-mm-dd
              hh24:mi:ss') AND "DATE_DATE"<=TO_DATE('2010-01-01 00:00:00',
              'yyyy-mm-dd hh24:mi:ss'))

Note
-----
   - cpu costing is off (consider enabling it)

SQL>
SQL> set autotrace off
SQL>
SQL> drop table t;

Table dropped.








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