Tune up of view query.

Hi All,
I have a view which is fetching 150,000 records on load of a form because of that the form is taking a long time to load. The problem here is i cannot use a PL as we are bound to supply small sql query's to Javascript pages. My query is simple
CREATE OR REPLACE FORCE VIEW ms_dms_ns_employee_info_v (employee_id,
employee_name,
first_name,
middle_name,
last_name,
physical_location,
payroll_store,
physical_location_code,
payroll_store_code,
business_unit,
payroll_dept,
payroll_dept_desc,
user_apr_manager,
user_assign_status,
user_role,
user_oracle_job_name,
job_exempt_status_code,
job_family_code,
person_type,
user_segment
AS
SELECT emp_user_id employee_id,
b.first_name
|| NVL2 (b.middle_initial, ' ' || b.middle_initial, '')
|| NVL2 (b.last_name, ' ' || b.last_name, '') AS employee_name,
b.first_name, b.middle_initial middle_name, b.last_name,
physical_location physical_location, payroll_store payroll_store,
physical_location_desc physical_location_code,
payroll_store_desc payroll_store_code, business_unit, payroll_dept,
payroll_dept_desc, user_apr_manager, user_assign_status, user_role,
user_oracle_job_name, job_exempt_status_code, job_family_code,
person_type, user_segment
FROM ms_gen_user_details a, si_users_t b
WHERE a.lan_id = b.user_name;
Is there any way to fasten this without using the PL block.
Morfeus.

DBMS_METADATA.GET_DDL('TABLE','MS_GEN_USER_DETAILS')
CREATE TABLE "DMS_60_NS_STG_1"."MS_GEN_USER_DETAILS"
(     "EMP_USER_ID" VARCHAR2(200 CHAR),
     "ATS_USERNAME" VARCHAR2(4000 CHAR),
     "PAYROLL_STORE" VARCHAR2(4000 CHAR),
     "PAYROLL_STORE_DESC" VARCHAR2(4000 CHAR),
     "PHYSICAL_LOCATION" VARCHAR2(4000 CHAR),
     "PHYSICAL_LOCATION_DESC" VARCHAR2(4000 CHAR),
     "BUSINESS_UNIT" VARCHAR2(4000 CHAR),
     "PAYROLL_DEPT" VARCHAR2(4000 CHAR),
     "PAYROLL_DEPT_DESC" VARCHAR2(4000 CHAR),
     "USER_APR_MANAGER" VARCHAR2(4000 CHAR),
     "USER_ASSIGN_STATUS" VARCHAR2(4000 CHAR),
     "USER_ROLE" VARCHAR2(4000 CHAR),
     "USER_ORACLE_JOB_NAME" VARCHAR2(4000 CHAR),
     "JOB_EXEMPT_STATUS_CODE" VARCHAR2(4000 CHAR),
     "JOB_FAMILY_CODE" VARCHAR2(4000 CHAR),
     "PERSON_TYPE" VARCHAR2(4000 CHAR),
     "USER_SEGMENT" VARCHAR2(4000 CHAR),
     "LAN_ID" VARCHAR2(4000 CHAR)
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "DMS_60_NS_STG_1_DATA"
1 row selected.
DBMS_METADATA.GET_DDL('TABLE','SI_USERS_T')
CREATE TABLE "DMS_60_NS_STG_1"."SI_USERS_T"
(     "USER_ID" NUMBER,
     "ENTERPRISE_ID" NUMBER,
     "LAST_NAME" VARCHAR2(30 CHAR),
     "MIDDLE_INITIAL" VARCHAR2(6 CHAR),
     "FIRST_NAME" VARCHAR2(30 CHAR),
     "EMAIL_ADDRESS" VARCHAR2(80 CHAR),
     "PAGER_NUMBER" VARCHAR2(80 CHAR),
     "PHONE_NUMBER" VARCHAR2(80 CHAR),
     "USER_NAME" VARCHAR2(80 CHAR),
     "PASSWORD" VARCHAR2(120 CHAR),
     "TIMEZONE" NUMBER,
     "REPORT_FORMAT" NUMBER,
     "START_DATE" DATE,
     "END_DATE" DATE,
     "CREATED_BY" NUMBER,
     "CREATION_DATE" DATE,
     "LAST_UPDATED_BY" NUMBER,
     "LAST_UPDATE_DATE" DATE,
     "XML" VARCHAR2(4000 CHAR),
     "COMMENTS" VARCHAR2(1000 CHAR),
     "SERVER_GENERATED_CHARTS" VARCHAR2(1 CHAR),
     "LOCATION" VARCHAR2(100 CHAR),
     "LOCALE" VARCHAR2(100 CHAR),
     "INFOCENTER_FLAG" VARCHAR2(1 CHAR),
     "DEFAULT_FIRST_PAGE" NUMBER,
     "ELECTRONIC_SIGNATURE" VARCHAR2(120 CHAR),
     "PASSWORD_LAST_UPDATE_DATE" DATE,
     "SIGNATURE_LAST_UPDATE_DATE" DATE,
     "FORGOT_PWD_QUESTION_ID" NUMBER,
     "LOCALE_FK" NUMBER
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 2 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "DMS_60_NS_STG_1_DATA"
1 row selected.

Similar Messages

VIEW Query Problem

Hi Greg,
I had created a view on a table which doesn't have Primary Key, but it has Unique and Not Null constraints on required columns.
I had wrote a procedure to query the data on VIEW. I have experienced strange problem, very first call to procedure will take more time than succeeding requests. For example from second request onwards, it returns data in < 2 Sec, but first transaction is taking 12 Sec to 30 Sec.
I thought that very first time VIEW is taking time to refresh it self. So, I added FORCE keyword in CREATE VIEW stattement. However, that doesn't helped out.
In my further investigation I came to know that base table on which VIEW created, has to be loaded in to memory before querying on VIEW.
So, I had executed a simple select statement on base table, before I execute VIEW query in procedure.
With this change I got results consistently < 2 Sec all the times.
My question is instead of executing the select statement on base table is there a way to load base tables data in memory before querying on VIEW?
Thanks,
Subbarao

Hi,
A view is nothing but parsed SQL statements stored in the database, a view may or may not run faster. If you execute the SQL used to define the view how much time is it taking. If you want try looking at MATERIALIZED VIEW , that may help you.
thanks

Reg: fetch the data by using item_id which is retuned by In line View Query

Hi all,
create table xxc_transactions(type_id number,trx_line_id number ,item_id number,org_id number);
insert into xxc_transactions values(null,null,null,null);
create table xxc_items1(item_id number,org_id number,item_no varchar2(10));
insert into xxc_items1 values(123,12,'book');
create table xxc_headers(header_id number,order_id number);
insert into xxc_headers values(null,null);
create table xxc_lines(header_id number,item_id number,line_id number);
insert into xxc_lines values(null,null,null);
create table xxc_types_tl(transaction_id number,NAME varchar2(10));
insert into xxc_types_tl values(106,'abc');
create table xxc_quantity(item_id number);
insert into xxc_quantity values (123);
create table xxc_quantity_1(item_id number);
insert into xxc_quantity_1 values (123);
SELECT union_id.item_id,
       b.org_id,
       e.name,
       fun1(union_id.item_id) item_no
FROM   xxc_transactions a,
       xxc_items1 b,
       xxc_headers c,
       xxc_lines d,
       xxc_types_tl e,
       (SELECT item_id
        FROM   xxc_quantity
        WHERE item_id = 123
        UNION
        SELECT item_id
        FROM   xxc_quantity_1
        WHERE item_id = 123
        UNION
        SELECT item_id
        FROM   xxc_transactions
        WHERE item_id = 123) union_id
WHERE a.type_id = 6
       AND a.item_id = b.item_id
       AND union_id.item_id = b.item_id
       AND a.org_id = b.org_id
       AND c.header_id = d.header_id
       AND d.line_id = a.trx_line_id
       AND d.item_id = b.item_id
       AND c.order_id = e.transaction_id
       AND b.org_id = 12
GROUP BY union_id.item_id,
          b.org_id,
          e.name
ORDER BY union_id.item_id;
create or replace function fun1(v_item in number)
return varchar2
is
v_item_no
Begin
   select item_no from xxc_items1
   where item_id=v_item;
   return v_item_no ;
    Exception
     When Others Then
      v_item_no := null;
      return v_item_no;
END fun1;
I need fetch the data by using item_id which is retuned by In line View Query(UNION)
item_id org_id name item_no
123        12        abc       book
Version: 11.1.0.7.0 and 11.2.0.1.0
Message was edited by: Rajesh123 Added test cases script
Message was edited by: Rajesh123 changed Question as fetch the data by using item_id which is retuned by In line View Query(UNION)

Hi Master , sorry for the late reply and can you please help on this?
create table xxc_transactions(type_id number,trx_line_id number ,item_id number,org_id number);
insert into xxc_transactions values(null,null,null,null);
create table xxc_items(item_id number,org_id number,item_no varchar2(10));
insert into xxc_items values(123,12,'book');
create table xxc_headers(header_id number,order_id number);
insert into xxc_headers values(null,null);
create table xxc_lines(header_id number,item_id number,line_id number);
insert into xxc_lines values(null,null,null);
create table xxc_types_tl(transaction_id number,NAME varchar2(10));
insert into xxc_types_tl values(106,'abc');
create table xxc_uinon_table(item_id number);
insert into xxc_types_tl values(123);
SELECT   union_id.item_id,
         b.org_id ,
         e.name ,
         fun1(union_id.item_id) item_no   --> to get item_no
         FORM xxc_transactions a,
         xxc_items             b,
         xxc_headers           c,
         xxc_lines             d,
         xxc_types_tl          e,
         ( SELECT item_id
             FROM   xxc_uinon_table ) union_id
WHERE    a.type_id= 6
AND      a.item_id = b.item_id
AND      union_id.item_id = b.item_id
AND      a.org_id = b.org_id
AND      c.header_id = d.header_id
AND      d.line_id= a.trx_line_id
AND      d.item_id= b.item_id
AND      c.order_id= e.transaction_id ---106
AND      b.org_id = 12
GROUP BY union_id.item_id,
         b.org_id ,
         e.name
ORDER BY union_id.item_id;
Note: xxc_uinon_table is a combination of UNION's
select 1 from dual
union
select 1 from dual
union
select no rows returned from dual;
I will get 1 from the above Query
Thank you in advanced

Spatial vs. materialized views/query rewrite

Dear all,
we are trying to use Spatial (Locator) functionality together with performance optimization using materialized views and query rewrite, and it does not seem to work. Does anybody has experience with this?
The problem in more detail:
* There is a spatial attribut (vom Typ GEOMETRY) in our table;
* we define a materialized view on that table;
* we run a query that could be better answered using the materialized view with query rewrite;
*the optimizer does not choose the plan using the materialized view, query rewrite does not take place;
This happenes, even if neither the materialized view, nor the query contains the spatial attribut.
The explanation given by the procedure DBMS_MVIEW.Explain_Rewrite is:
"QSM-01064 query has a fixed table or view Cause: Query
rewrite is not allowed if query references any fixed tables or views"
We are using Oracle 9R2, Enterprise Edition, with locator. Nevertheless, it would also be interesting, if there is any improvement in 10g?
A more complicated task, using materialized views to optimize spatial operations (e.g., sdo_relate) would also be very interesting, as spatial joins are very expensive operations.
Thanks in advance for any comments, ideas!
Cheers,
Gergely Lukacs

Hi Dan,
thanks for your rapid response!
A simple example is:
alter session set query_rewrite_integrity=trusted;
alter session set query_rewrite_enabled=true;
set serveroutput on;
/* Creating testtable */
CREATE TABLE TESTTABLE (
KEY1 NUMBER (4) NOT NULL,
KEY2 NUMBER (8) NOT NULL,
KEY3 NUMBER (14) NOT NULL,
NAME VARCHAR2 (255),
X NUMBER (9,2),
Y NUMBER (9,2),
ATTR1 VARCHAR2 (2),
ATTR2 VARCHAR2 (30),
ATTR3 VARCHAR2 (80),
ATTR4 NUMBER (7),
ATTR5 NUMBER (4),
ATTR6 NUMBER (5),
ATTR7 VARCHAR2 (40),
ATTR8 VARCHAR2 (40),
CONSTRAINT TESTTABLE_PK
PRIMARY KEY ( KEY1, KEY2, KEY3 ));
/* Creating materialized view */
CREATE MATERIALIZED VIEW TESTTABLE_MV
REFRESH COMPLETE
ENABLE QUERY REWRITE
AS SELECT DISTINCT ATTR7, ATTR8
FROM TESTTABLE;
/* Creating statistics, just to make sure */
execute dbms_stats.gather_table_stats(ownname=> 'TESTSCHEMA', tabname=> 'TESTTABLE', cascade=>TRUE);
execute dbms_stats.gather_table_stats(ownname=> 'TESTSCHEMA', tabname=> 'TESTTABLE_MV', cascade=>TRUE);
/* Explain rewrite procedure */
DECLARE
Rewrite_Array SYS.RewriteArrayType := SYS.RewriteArrayType();
querytxt VARCHAR2(1500) :=
'SELECT COUNT(*) FROM (
SELECT DISTINCT
ATTR8 FROM
TESTTABLE
i NUMBER;
BEGIN
DBMS_MVIEW.Explain_Rewrite(querytxt, 'TESTTABLE_MV', Rewrite_Array);
FOR i IN 1..Rewrite_Array.count
LOOP
DBMS_OUTPUT.PUT_LINE(Rewrite_Array(i).message);
END LOOP;
END;
The message you get is:
QSM-01009 materialized view, string, matched query text
Cause: The query was rewritten using a materialized view, because query text matched the materialized view text.
Action: No action required.
i.e. query rewrite works!
/* Adding geometry column to the testtable -- not to the materialized view, and not to the query! */
ALTER TABLE TESTTABLE
ADD GEOMETRYATTR mdsys.sdo_geometry;
/* Explain rewrite procedure */
DECLARE
Rewrite_Array SYS.RewriteArrayType := SYS.RewriteArrayType();
querytxt VARCHAR2(1500) :=
'SELECT COUNT(*) FROM (
SELECT DISTINCT
ATTR8 FROM
TESTTABLE
i NUMBER;
BEGIN
DBMS_MVIEW.Explain_Rewrite(querytxt, 'TESTTABLE_MV', Rewrite_Array);
FOR i IN 1..Rewrite_Array.count
LOOP
DBMS_OUTPUT.PUT_LINE(Rewrite_Array(i).message);
END LOOP;
END;
The messages you get are:
QSM-01064 query has a fixed table or view
Cause: Query rewrite is not allowed if query references any fixed tables or views.
Action: No action required.
QSM-01019 no suitable materialized view found to rewrite this query
Cause: There doesn't exist any materialized view that can be used to rewrite this query.
Action: Consider creating a new materialized view.
i.e. query rewrite does not work!
If this works, the next issue is to use materialized views for optimizing spatial operations, e.g., a spatial join. I can supply you with an example, if necessary (only makes sense, I think, after the first problem is solved).
Thanks in advance for any ideas, comments!
Cheers,
Gergely

Creating a Hierarchy Viewer query

Hello,
I'm having huge difficulties creating a Hierarchy Viewer Query. I've looked through the source code contained withing the demo, but it seems to require great knowledge regarding the component. I'm using a three-node model, each node grouped within it's parent.
So I created a custom View to be used as a result list for the query and this part is working just fine. I can pick the unique ID for the node I want from the search results when the user selects one, but I don't know how I can make that specific node my "anchor", my "current node", after that.
Since I'm looking for a specific "contact_id" selected from the search results, I think the correct way of doing it is finding it's node on the TreeModel, and then setting it as my current anchor.
Please, any tips, directions or suggestions on how can I go about doing this?
Thanks!!

Hi!
Thanks for the attention, but I've been through all the basic stuff. The HV documentation only teaches the most primitive part of it. I searched all blogs related to HV, all articles I could find, I've meddled with the demo source code and all I can think of, but I couldn't find anyone who would give much insight on the mechanics of the component or how to build a really powerful search engine for it.
As a sugestion for the developer team, it would be great if the query for this component allowed us to specify actions to be performed on all levels of the tree, instead of only the root node, since most of the time people use HV as a multi-root tree.

Materialized view query (Oracle 9i)

I have dropped a materialized view query and trying to create the same with additional columns in the prebuilt table.
Option - 1
when Iam using a query in the materialized view query "select * from schema.table@link, with refresh mode fast option, the database throws an error " no table or view exists"
Option - 2
When Iam using a query in the materialized view query "select * from schema.table@link, with refresh mode option either complete or force, it gets created.
I need to create the above materialized view query in the fast mode option, Please help.
-bala

Hi,
Does a table named profit_mvw already exist?
The following example illustrates the two steps required to register a user-defined table. First, the table is created, then the materialized view is defined using exactly the same name as the table. This materialized view sum_sales_tab is eligible for use in query rewrite.
CREATE TABLE sum_sales_tab
PCTFREE 0 TABLESPACE demo
STORAGE (INITIAL 16k NEXT 16k PCTINCREASE 0) AS
SELECT s.prod_id, SUM(amount_sold) AS dollar_sales,
SUM(quantity_sold) AS unit_sales
FROM sales s GROUP BY s.prod_id;
CREATE MATERIALIZED VIEW sum_sales_tab
ON PREBUILT TABLE WITHOUT REDUCED PRECISION
ENABLE QUERY REWRITE AS
SELECT s.prod_id, SUM(amount_sold) AS dollar_sales,
SUM(quantity_sold) AS unit_sales
FROM sales s GROUP BY s.prod_id;
Regards,
Simon

ORA-01762: vopdrv: view query block not in FROM ????

Hi All
any one aware of the error.
ORA-01762: vopdrv: view query block not in FROM
Please reply back.

ORA-01762:vopdrv: view query block not in FROM
Cause:This is an internal error message not normally issued.
Action:Contact Oracle Support Services.
Edited by: Karthick_Arp on Sep 23, 2008 11:01 PM

Declaratively set the value of a bind parameter in a view query

Can I declaratively set that I want the value of the bind parameter in the view query to be the value of a specific field in the current row of a specific iterator in my data bindings? Thanks :D

user11976105 wrote:
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In the code spinet, the new value from the ValueChangeEvent is passed to the bind variable.
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Hi,
I m tring to use the DART tool for extract tax data;
We extact the tax data from 2 separately system SAP ECC6 (S1 et S2) with DART
My question is :
It is possible to use a extract file generate by S1 for executing view query in S2 system with the (FTWH) transaction
Thank you for your help

Hi,
i m answer my self about this question
it is possible to use a extraction file generated by S2 system in S1 system to query directely this file and we can also to use this file by view query transaction
The only restriction is to use the same technical configuration for the both systems FTWP (technicals options)
bye
Mohamed

"ORA-01762: vopdrv: view query block not in FROM" while using LOG ERRORS INTO feature for Update/Delete

Hi
Ours is VPD database in 11GR2. We're using "LOG ERRORS INTO " feature to track list of records violating constraints.
For Inserts it is working as expected but for Updates/Deletes it is throwing mis. ORA- errors. "ORA-01762: vopdrv: view query block not in FROM"
We dint find any clue when searched in net.
Could someone help us here? Is there any limitation with "LOG ERRORS INTO" ?
Below are the steps we're executing
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dml_table_name => 'EMP',
err_log_table_name => 'ERR_EMP'
> DESC EMP
Name                                      Null?    Type
EMPNO                                     NOT NULL NUMBER(4)
ENAME                                              VARCHAR2(10)
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                             NUMBER(2)
INSERT INTO EMP VALUES('1','Test','@' /* generates Ora */,2,'2); -- ERR_EMP populated
UPDATE EMP set SAL='@'
where EMPNO='1' -- Throwing ORA-01762: vopdrv: view query block not in FROM
Could someone help us?

Hi
Ours is VPD database in 11GR2. We're using "LOG ERRORS INTO " feature to track list of records violating constraints.
For Inserts it is working as expected but for Updates/Deletes it is throwing mis. ORA- errors. "ORA-01762: vopdrv: view query block not in FROM"
We dint find any clue when searched in net.
Could someone help us here? Is there any limitation with "LOG ERRORS INTO" ?
Below are the steps we're executing
EXEC DBMS_ERRLOG.CREATE_ERROR_LOG(
dml_table_name => 'EMP',
err_log_table_name => 'ERR_EMP'
> DESC EMP
Name                                      Null?    Type
EMPNO                                     NOT NULL NUMBER(4)
ENAME                                              VARCHAR2(10)
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                             NUMBER(2)
INSERT INTO EMP VALUES('1','Test','@' /* generates Ora */,2,'2); -- ERR_EMP populated
UPDATE EMP set SAL='@'
where EMPNO='1' -- Throwing ORA-01762: vopdrv: view query block not in FROM
Could someone help us?

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I need some tutorial sample project explaining how to connect a grid to view\query from a DB. I failed to google it - any links?

The grid is called JTable.
[JTable tutorial|http://java.sun.com/docs/books/tutorial/uiswing/components/table.html]
You can find examples and similar questions in the [JDBC forum|http://forums.sun.com/forum.jspa?forumID=48].
There's also a link to the [JDBC FAQ|http://java.sun.com/products/jdbc/faq.html].

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Hi all,
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Regards
Deepthi.

Hi,
i m answer my self about this question
it is possible to use a extraction file generated by S2 system in S1 system to query directely this file and we can also to use this file by view query transaction
The only restriction is to use the same technical configuration for the both systems FTWP (technicals options)
bye
Mohamed

Bad query plan for self-referencing CTE view query and variable in WHERE clause. Is there way out or this is SQL Server defect?

Please help. Thank you for your time and expertise.
Prerequisites: sql query needs to be a view. Real view is more than recursion. It computes location path, is used in JOINs and returns this path.
Problem: no matter what I tried, sql server does not produce 'index seek' when using variable but does with literal.
See full reproduction code below.
I expect that query SELECT lcCode FROM dbo.vwLocationCodes l WHERE l.lcID = @lcID will seek UNIQUE index but it does not.
I tried these:
1. Changing UX and/or PK to be CLUSTERED.
2. query OPTION(RECOMPILE)
3. FORCESEEK on view
4. SQL Server 2012/2014
5. Wrap it into function and CROSS APPLY. On large outer number of rows this just dies, no solution
but to no avail. This smells like a bug in SQL Server. I am seeking your confirmation.
I am thinking it is a bug as variable value is high-cardinality, 1, and query is against unique key. This must produce single seek, depending if clustered or nonclustred index is unique
Thanks
Vladimir
use tempdb
BEGIN TRAN
-- setup definition
CREATE TABLE dbo.LocationHierarchy(
lcID int NOT NULL ,
lcHID hierarchyid NOT NULL,
lcCode nvarchar(25) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
lcHIDParent AS lcHID.GetAncestor(1) PERSISTED,
CONSTRAINT PK_LocationHierarchy_lcID PRIMARY KEY NONCLUSTERED (lcID ASC),
CONSTRAINT UX_LocationHierarchy_pltID_lcHID UNIQUE CLUSTERED (lcHID ASC)
-- add some data
INSERT INTO dbo.LocationHierarchy
VALUES
(1, '/', 'A')
,(2, '/1/', 'B')
,(3, '/1/1/', 'C')
,(4, '/1/1/1/', 'D')
--DROP VIEW dbo.vwLocationCodes
GO
CREATE VIEW dbo.vwLocationCodes
AS
WITH ru AS
SELECT
lh.lcID
,lh.lcCode
,lh.lcHID
,CAST('/' + lh.lcCode + '/' as varchar(8000)) as LocationPath
-- to support recursion
,lh.lcHIDParent
FROM dbo.LocationHierarchy lh
UNION ALL
SELECT
ru.lcID
,ru.lcCode
,ru.lcHID
,CAST('/' + lh.lcCode + ru.LocationPath as varchar(8000)) as LocationPath
,lh.lcHIDParent
FROM dbo.LocationHierarchy lh
JOIN ru ON ru.lcHIDParent = lh.lcHID
SELECT
lh.lcID
,lh.lcCode
,lh.LocationPath
,lh.lcHID
FROM ru lh
WHERE lh.lcHIDParent IS NULL
GO
-- get data via view
SELECT
CONCAT(SPACE(l.lcHID.GetLevel() * 4), lcCode) as LocationIndented
FROM dbo.vwLocationCodes l
ORDER BY lcHID
GO
SET SHOWPLAN_XML ON
GO
DECLARE @lcID int = 2
-- I believe this produces bad plan and is defect in SQL Server optimizer.
-- variable value cardinality is 1 and SQL Server should know that. Optiomal plan is to do index seek with key lookup.
-- This does not happen.
SELECT lcCode FROM dbo.vwLocationCodes l WHERE l.lcID = @lcID -- bad plan
-- this is a plan I expect.
SELECT lcCode FROM dbo.vwLocationCodes l WHERE l.lcID = 2 -- good plan
-- I reviewed these but I need a view here, can't be SP
-- http://sqlblogcasts.com/blogs/tonyrogerson/archive/2008/05/17/non-recursive-common-table-expressions-performance-sucks-1-cte-self-join-cte-sub-query-inline-expansion.aspx
-- http://social.msdn.microsoft.com/Forums/sqlserver/en-US/22d2d580-0ff8-4a9b-b0d0-e6a8345062df/issue-with-select-using-a-recursive-cte-and-parameterizing-the-query?forum=transactsql
GO
SET SHOWPLAN_XML OFF
GO
ROLLBACK
Vladimir Moldovanenko

Here is more... note that I am creating table Items and these can be in Locations.
I am trying LEFT JOIN and OUTER APLLY to 'bend' query into NESTED LOOP and SEEK. There has to be nested loop, 2 rows against 4. But SQL Server fails to generate optimal plan with SEEK. Even RECOMPILE does not help
use tempdb
BEGIN TRAN
-- setup definition
CREATE TABLE dbo.LocationHierarchy(
lcID int NOT NULL ,
lcHID hierarchyid NOT NULL,
lcCode nvarchar(25) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
lcHIDParent AS lcHID.GetAncestor(1) PERSISTED,
CONSTRAINT PK_LocationHierarchy_lcID PRIMARY KEY NONCLUSTERED (lcID ASC),
CONSTRAINT UX_LocationHierarchy_pltID_lcHID UNIQUE CLUSTERED (lcHID ASC)
-- add some data
INSERT INTO dbo.LocationHierarchy
VALUES
(1, '/', 'A')
,(2, '/1/', 'B')
,(3, '/1/1/', 'C')
,(4, '/1/1/1/', 'D')
--DROP VIEW dbo.vwLocationCodes
GO
--DECLARE @Count int = 10;
--WITH L0 AS (SELECT N FROM (VALUES(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N (N))-- 10 rows
--,L1 AS (SELECT n1.N FROM L0 n1 CROSS JOIN L0 n2) -- 100 rows
--,L2 AS (SELECT n1.N FROM L1 n1 CROSS JOIN L1 n2) -- 10,000 rows
--,L3 AS (SELECT n1.N FROM L2 n1 CROSS JOIN L2 n2) -- 100,000,000 rows
--,x AS
-- SELECT TOP (ISNULL(@Count, 0))
-- ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) as Number
-- FROM L3 n1
--SELECT Number as itmID, NTILE(4)OVER(ORDER BY Number) as lcID
--INTO dbo.Items
--FROM x
----ORDER BY n1.N
--ALTER TABLE dbo.Items ALTER COLUMN itmID INT NOT NULL
--ALTER TABLE dbo.Items ADD CONSTRAINT PK PRIMARY KEY CLUSTERED (itmID)
CREATE TABLE dbo.Items (itmID int NOT NULL PRIMARY KEY, lcID int NOT NULL)
INSERT INTO dbo.items
VALUES(1, 1)
,(2, 3)
GO
CREATE VIEW dbo.vwLocationCodes
AS
WITH ru AS
SELECT
lh.lcID
,lh.lcCode
,lh.lcHID
,CAST('/' + lh.lcCode + '/' as varchar(8000)) as LocationPath
-- to support recursion
,lh.lcHIDParent
FROM dbo.LocationHierarchy lh
UNION ALL
SELECT
ru.lcID
,ru.lcCode
,ru.lcHID
,CAST('/' + lh.lcCode + ru.LocationPath as varchar(8000)) as LocationPath
,lh.lcHIDParent
FROM dbo.LocationHierarchy lh
JOIN ru ON ru.lcHIDParent = lh.lcHID
SELECT
lh.lcID
,lh.lcCode
,lh.LocationPath
,lh.lcHID
FROM ru lh
WHERE lh.lcHIDParent IS NULL
GO
-- get data via view
SELECT
CONCAT(SPACE(l.lcHID.GetLevel() * 4), lcCode) as LocationIndented
FROM dbo.vwLocationCodes l
ORDER BY lcHID
GO
--SET SHOWPLAN_XML ON
GO
DECLARE @lcID int = 2
-- I believe this produces bad plan and is defect in SQL Server optimizer.
-- variable value cardinality is 1 and SQL Server should know that. Optiomal plan is to do index seek with key lookup.
-- This does not happen.
SELECT lcCode FROM dbo.vwLocationCodes l WHERE l.lcID = @lcID-- OPTION(RECOMPILE) -- bad plan
-- this is a plan I expect.
SELECT lcCode FROM dbo.vwLocationCodes l WHERE l.lcID = 2 -- good plan
SELECT *
FROM dbo.Items itm
LEFT JOIN dbo.vwLocationCodes l ON l.lcID = itm.lcID
OPTION(RECOMPILE)
SELECT *
FROM dbo.Items itm
OUTER APPLY
SELECT *
FROM dbo.vwLocationCodes l
WHERE l.lcID = itm.lcID
) l
-- I reviewed these but I need a view here, can't be SP
-- http://sqlblogcasts.com/blogs/tonyrogerson/archive/2008/05/17/non-recursive-common-table-expressions-performance-sucks-1-cte-self-join-cte-sub-query-inline-expansion.aspx
-- http://social.msdn.microsoft.com/Forums/sqlserver/en-US/22d2d580-0ff8-4a9b-b0d0-e6a8345062df/issue-with-select-using-a-recursive-cte-and-parameterizing-the-query?forum=transactsql
GO
--SET SHOWPLAN_XML OFF
GO
ROLLBACK
Vladimir Moldovanenko

How to tune a oracle sql query to make it run faster ...

Hi Guys,
I am very new to this tuning of sql queries. It is taking a lot of time to run a query and give the output. I have a tool called TOAD[ Tool for oracle application development ] and i ran a query in that tool. Its showing that the query is taking 7sec to get its output. I donno the exact procedure what to follow in order to tune that query. What are these actually like : explain plan, sqltrace, tkprof and how to use these to tune the query. I want my query to run faster like in msec.
Help Appreciated.
Thanks

http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96533/toc.htm
http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96533/sqltrace.htm#1018

View query to results array

previus information... jdeveloper 10.1.3.0.4, the application is java swing adf bc .
hi, i have a bc view (sql only) inside an application module, how could i assign the results of view's query with an array of objects.

Not sure if this is on target, but if you are using ADF BC the view object's query results are already in an array of objects. Reference the following document to view how the results are structured. You can programmatically then work with the results set using the ViewObject, RowSet, and RowSetIterator Interfaces. See the SRDemo Application Module services for some examples of this in action (demo is in JSF though, not Swing.)
http://www.oracle.com/technology/products/jdev/tips/muench/mostcommon/index.html
thanks

Tune up of view query.

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