Oracle text contains and mixed queries

Question

Trying to optimize the following sql statement using oracle text.  When postal code is given, I would like to limit the contains to only filter the smaller subset.  Both of these queries produce the same results in the same amount of time with practically identical explain plans. Is there any way to get contains to only search the subset of postal codes and not the entire table.
select *
from ADDRESS
where CONTAINS(ADDRESS1_TEXT, ' "1%" AND "%str%" ') > 0
and POSTAL_CODE like '77539%'
select *
from ADDRESS
where address_id in (select address_id from address where POSTAL_CODE like '77539%')
and CONTAINS(ADDRESS1_TEXT, ' "1%" AND "%str%" ') > 0
Thanks for any help,
Gus

Answer 1

You can use FILTER BY in the index creation and SDATA in the query, as shown below.
SCOTT@orcl12c> CREATE TABLE address
  2    (address1_text  VARCHAR2(15),
  3      postal_code    VARCHAR2(15))
  4  /
Table created.
SCOTT@orcl12c> INSERT INTO address VALUES ('12 astrb', '775391')
  2  /
1 row created.
SCOTT@orcl12c> INSERT INTO address
  2  SELECT SUBSTR (object_name, 1, 15),
  3          object_id
  4  FROM  all_objects
  5  /
89979 rows created.
SCOTT@orcl12c> CREATE INDEX test_idx
  2  ON address (address1_text)
  3  INDEXTYPE IS CTXSYS.CONTEXT
  4  FILTER BY postal_code
  5  /
Index created.
SCOTT@orcl12c> SET AUTOTRACE ON EXPLAIN
SCOTT@orcl12c> SELECT * FROM address
  2  WHERE  CONTAINS
  3            (address1_text,
  4            '"1%" AND "%str%" AND SDATA (postal_code LIKE ''77539%'')') > 0
  5  /
ADDRESS1_TEXT  POSTAL_CODE
12 astrb        775391
1 row selected.
Execution Plan
Plan hash value: 3864510387
| Id  | Operation                  | Name    | Rows  | Bytes | Cost (%CPU)| Time    |
|  0 | SELECT STATEMENT            |          |    44 |  1320 |    13  (0)| 00:00:01 |
|  1 |  TABLE ACCESS BY INDEX ROWID| ADDRESS  |    44 |  1320 |    13  (0)| 00:00:01 |
|*  2 |  DOMAIN INDEX              | TEST_IDX |      |      |    4  (0)| 00:00:01 |
Predicate Information (identified by operation id):
  2 - access("CTXSYS"."CONTAINS"("ADDRESS1_TEXT",'"1%" AND "%str%" AND SDATA
              (postal_code LIKE ''77539%'')')>0)
Note
  - dynamic statistics used: dynamic sampling (level=2)
SCOTT@orcl12c>