Oracle 11g - Problem in referring ROWNUM in the SQL

Question

Hello All,
We are facing a strange problem with Oracle 11g (11.2.0.1.0).
When we issue a query which refers the rownum, it returns a invalid record ( which is not exists in the table).
The same sql is working fine once we analyze the table
Note: The same sql is working fine with oracle 10g (Before analyze also).
The script to reproduce the issue:
DROP TABLE BusinessEntities;
CREATE TABLE BusinessEntities
business_entity_id VARCHAR2(25) PRIMARY KEY,
business_entity_name VARCHAR2(50) NOT NULL ,
owner_id VARCHAR2(25) ,
statutory_detail_id NUMBER ,
address_id NUMBER NOT NULL
DROP TABLE BusEntityRoles;
CREATE TABLE BusEntityRoles
business_entity_id VARCHAR2(25) NOT NULL,
role_id VARCHAR2(10) NOT NULL,
PRIMARY KEY (business_entity_id, role_id)
INSERT
INTO businessentities ( business_entity_id , business_entity_name, owner_id , statutory_detail_id , address_id)
VALUES
( 'OWNER', 'OWNER Corporation Ltd', NULL , 1, 1 );
INSERT
INTO businessentities ( business_entity_id , business_entity_name, owner_id , statutory_detail_id , address_id)
VALUES
( 'ALL_IN_ALL', 'ALL IN ALL Corporation Ltd', 'OWNER' , 2, 2 );
INSERT INTO busentityroles(business_entity_id, role_id) VALUES ('TEST' , 'OWNER');
INSERT INTO busentityroles (business_entity_id,role_id) VALUES ('TEST','VENDOR');
INSERT INTO busentityroles(business_entity_id, role_id) VALUES ('ALL_IN_ALL' , 'VENDOR');
SELECT *
FROM
(SELECT raw_sql_.business_entity_id, raw_sql_.business_entity_name, raw_sql_.owner_id, raw_sql_.address_id,
rownum raw_rnum_
FROM
(SELECT *
FROM BusinessEntities
WHERE (business_entity_id IN
(SELECT business_entity_id
FROM BusinessEntities
WHERE business_entity_id = 'OWNER'
OR owner_id = 'ALL_IN_ALL'
AND business_entity_id NOT IN
(SELECT business_entity_id FROM BusEntityRoles
ORDER BY business_entity_id ASC
) raw_sql_
WHERE rownum <= 5
WHERE raw_rnum_ > 0;
OUTPUT Before Analyzing
BUSINESS_ENTITY_ID: OWNER
BUSINESS_ENTITY_NAME: NULL
OWNER_ID: OWNER
ADDRESS_ID: NULL
RAW_RNUM_: 1
Note: There is no record in the table with the value business_entity_id as 'OWNER' and OWNER_ID as 'OWNER' and the address_id as NULL
OUTPUT : After analyzed the table Using the below mentioned command
ANALYZE TABLE "BUSENTITYSUPPLYCHAINROLES" ESTIMATE STATISTICS
ANALYZE TABLE "BUSINESSENTITIES" ESTIMATE STATISTICS
BUSINESS_ENTITY_ID: OWNER
BUSINESS_ENTITY_NAME: OWNER Corporation Ltd
OWNER_ID: NULL
ADDRESS_ID: 1
RAW_RNUM_: 1
Any clue why Oracle 11g is behaving like this.

Answer 1

Hi,
it's a good practice to give aliases for tables, as well as name query blocks. Here it is (and formatted for convinience):
select --/*+ gather_plan_statistics optimizer_features_enable('10.2.0.4') */
  from (select /*+ qb_name(v2) */
               raw_sql_.business_entity_id
              ,raw_sql_.business_entity_name
              ,raw_sql_.owner_id
              ,raw_sql_.address_id
              ,rownum raw_rnum_
          from (select /*+ qb_name(v1) */ *
                  from businessentities b1
                 where (b1.business_entity_id in
                       (select /*+ qb_name(in) */ b2.business_entity_id
                           from businessentities b2
                          where business_entity_id = 'OWNER'
                             or owner_id = 'ALL_IN_ALL'
                            and business_entity_id not in
                               (select /*+ qb_name(not_in) */ r.business_entity_id from busentityroles r)))
                 order by business_entity_id asc) raw_sql_
         where rownum <= 5)
where raw_rnum_ > 0;You are facing some bug - definitely - and, possibly, it is caused by [join elimination|http://optimizermagic.blogspot.com/2008/06/why-are-some-of-tables-in-my-query.html]. As a workaround you should rewrite the query to eliminate unnecessary join manually; or you may include a hint to not eliminate join (it's not documented):
SQL>
select -- /*+ gather_plan_statistics optimizer_features_enable('10.2.0.4') */
  from (select /*+ qb_name(v2)  */
               raw_sql_.business_entity_id
              ,raw_sql_.business_entity_name
              ,raw_sql_.owner_id
              ,raw_sql_.address_id
              ,rownum raw_rnum_
          from (select /*+ qb_name(v1) no_eliminate_join(b1) */ *
                  from businessentities b1
                 where (b1.business_entity_id in
                       (select /*+ qb_name(in) */ b2.business_entity_id
                           from businessentities b2
                          where business_entity_id = 'OWNER'
                             or owner_id = 'ALL_IN_ALL'
                            and business_entity_id not in
                               (select /*+ qb_name(not_in) */ r.business_entity_id from busentityroles r)))
                 order by business_entity_id asc) raw_sql_
         where rownum <= 5)
20   where raw_rnum_ > 0;
BUSINESS_ENTITY_ID        BUSINESS_ENTITY_NAME                               OWNER_ID                  ADDRESS_ID  RAW_RNUM_
OWNER                     OWNER Corporation Ltd                                                                 1          1Strange thing is executing a transformed query gives correct result too:
SELECT "from$_subquery$_001"."BUSINESS_ENTITY_ID" "BUSINESS_ENTITY_ID",
       "from$_subquery$_001"."BUSINESS_ENTITY_NAME" "BUSINESS_ENTITY_NAME",
       "from$_subquery$_001"."OWNER_ID" "OWNER_ID",
       "from$_subquery$_001"."ADDRESS_ID" "ADDRESS_ID",
       "from$_subquery$_001"."RAW_RNUM_" "RAW_RNUM_"
  FROM  (SELECT /*+ QB_NAME ("V2") */
                "RAW_SQL_"."BUSINESS_ENTITY_ID" "BUSINESS_ENTITY_ID",
                "RAW_SQL_"."BUSINESS_ENTITY_NAME" "BUSINESS_ENTITY_NAME",
                "RAW_SQL_"."OWNER_ID" "OWNER_ID","RAW_SQL_"."ADDRESS_ID" "ADDRESS_ID",
                ROWNUM "RAW_RNUM_"
           FROM  (SELECT /*+ QB_NAME ("V1") */
                        "SYS_ALIAS_1"."BUSINESS_ENTITY_ID" "BUSINESS_ENTITY_ID",
                        "SYS_ALIAS_1"."BUSINESS_ENTITY_NAME" "BUSINESS_ENTITY_NAME",
                        "SYS_ALIAS_1"."OWNER_ID" "OWNER_ID",
                        "SYS_ALIAS_1"."STATUTORY_DETAIL_ID" "STATUTORY_DETAIL_ID",
                        "SYS_ALIAS_1"."ADDRESS_ID" "ADDRESS_ID"
                   FROM "TIM"."BUSINESSENTITIES" "SYS_ALIAS_1"
                  WHERE ("SYS_ALIAS_1"."BUSINESS_ENTITY_ID"='OWNER'
                      OR "SYS_ALIAS_1"."OWNER_ID"='ALL_IN_ALL' AND  NOT
                         EXISTS (SELECT /*+ QB_NAME ("NOT_IN") */ 0
                                   FROM "TIM"."BUSENTITYROLES" "R"
                                  WHERE "R"."BUSINESS_ENTITY_ID"="SYS_ALIAS_1"."BUSINESS_ENTITY_ID")
                  ORDER BY "SYS_ALIAS_1"."BUSINESS_ENTITY_ID") "RAW_SQL_"
         WHERE ROWNUM<=5) "from$_subquery$_001"
26   WHERE "from$_subquery$_001"."RAW_RNUM_">0
27  /
BUSINESS_ENTITY_ID        BUSINESS_ENTITY_NAME                               OWNER_ID                  ADDRESS_ID  RAW_RNUM_
OWNER                     OWNER Corporation Ltd                                                                 1          1