Indexed Views.

Can anyone explain me, by creating such a structure, am i creating an indexed view
Create Table Abhi_EMP As
Select 1 IND, EmpNo, EName, Mgr From DSS1
Union
Select 2 IND, EmpNo, EName, Mgr From DSS2
Union
Select 3 IND, EmpNo, EName, Mgr From DSS3
Union
Select 4 IND, EmpNo, EName, Mgr From DSS4
Union
Select 5 IND, EmpNo, EName, Mgr From DSS5;
So whenever i query this view using a filter (Where IND = 3), the view in turn
might query base table DSS3.

Well my malaysian friend
Select * from View Where IND = 3;
I've checked the o/p and was astonished to see that inspite of the fact DSS2 was in tablespace EXAMPLE which was offline, i got the o/p.
Explain plan also shows a FILTER.
So i guess, oracle before querying the base tables tries to parse the definiton of the view sequel that prunes out some of the tables based on filter condition //
where IND = 3;

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Oracle text indexed view is possible???

ok,
My table name is T_DOC :
ID----------------> NUMBER(30)
DESCRIPTION-------> VARCHAR2(2000 BYTE)
DOC---------------> BLOB
FILENAME----------> VARCHAR2(2000 BYTE)
MIMETYPE----------> VARCHAR2(2000 BYTE)
LAST_UPDATE_DATE--> DATE
T_DOC
| Id | DESCRIPTION | DOC | FILENAME | MIMETYPE | LAST_UPDATE_DATE |
| 1 | THE DOG | *(!BLOB) | THE_CAT.PDF | application/pdf | 20/05/2010 15:06:15 |
| 2 | THE BIRD | **(!BLOB) | THE_BIRD.PDF | application/pdf | 20/05/2010 15:06:15 |
| 3 | THE HUMAN AND CAT | ***(!BLOB) | THE_HUMAN.PDF | application/pdf | 20/05/2010 15:06:15 |
* is a document .pdf with content: "the dog and cat"
** is a document .pdf with content: "the bird in house"
*** is a document .pdf with content: "the human from USA"
Index the columns DESCRIPTION, DOC (document content), FILENAME
begin
ctx_ddl.create_preference('idxDoc_lx', 'BASIC_LEXER');
ctx_ddl.set_attribute (' idxDoc_lx ', 'MIXED_CASE', 'NO');
end;
begin
ctx_ddl.create_preference('idxDoc_ds', 'MULTI_COLUMN_DATASTORE');
ctx_ddl.set_attribute ('idxDoc_ds', 'COLUMNS', 'DOC, FILENAME, DESCRIPTION');
end;
CREATE INDEX IDX_DOC
ON T_DOC (FILENAME)
INDEXTYPE IS CTXSYS.CONTEXT
PARAMETERS ('lexer idxDoc_lx
datastore idxDoc_ds
filter CTXSYS.AUTO_FILTER
sync (on commit)');Search Query:
select ID
from T_DOC
where CONTAINS (DOCUMENTO, 'CAT', 1) > 0 RESULT ID = 1
WHY NOT ALSO Returned ID 3 ??????

Indexed views using indexes on base table

Hi all,
CREATE VIEW Sales.vOrders
WITH SCHEMABINDING
AS
SELECT SUM(UnitPrice*OrderQty*(1.00-UnitPriceDiscount)) AS Revenue,
OrderDate, ProductID, COUNT_BIG(*) AS COUNT
FROM Sales.SalesOrderDetail AS od, Sales.SalesOrderHeader AS o
WHERE od.SalesOrderID = o.SalesOrderID
GROUP BY OrderDate, ProductID;
GO
--Create an index on the view.
CREATE UNIQUE CLUSTERED INDEX IDX_V1
ON Sales.vOrders (OrderDate, ProductID);
GO
--This query can use the indexed view even though the view is
--not specified in the FROM clause.
SELECT SUM(UnitPrice*OrderQty*(1.00-UnitPriceDiscount)) AS Rev,
OrderDate, ProductID
FROM Sales.SalesOrderDetail AS od
JOIN Sales.SalesOrderHeader AS o ON od.SalesOrderID=o.SalesOrderID
AND ProductID BETWEEN 700 and 800
AND OrderDate >= CONVERT(datetime,'05/01/2002',101)
GROUP BY OrderDate, ProductID
ORDER BY Rev DESC;
In the above code block, Sales.SalesOrderDetail and Sales.SalesOrderHeader are base tables.
Say suppose there are some indexes on some of the columns of these base tables. Are these indexes used when we write a query in which indexed view is mentioned
in the from clause?
Thanks, Srikar

SO far as its a indexed view it wont use the indexes on base tables when you use it in a query as indexed view is persisted and exists as a physical object. SO it doent require definition to be substituted and data to be retrieved from the base objects.
The indexes will come handy while populating the indexed view.
Please Mark This As Answer if it solved your issue
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Visakh
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Stored Procedures VS Indexed Views - Performance?

Hey folks,
In the past, one of the factors I'd consider when choosing to use a Stored Procedure over a View was the fact that the Stored Procedure would get optimized by storing the query execution path (I'm a developer so I understand this at a higher level than a
DBA would). But I've recently become aware of the fact that you can now Index your Views. This has now raised new questions for me as to when I'd get better performance out of the Indexed View versus the Stored Procedure?
Take for example the following:
SELECT colA, colB, sum(colC), sum(colD), colE
FROM myTable
WHERE colFDate < '9/30/2011'
GROUP BY colA, colB, colE
The date will be different every time it's run, so if this were a view, I wouldn't include the WHERE in the view and instead have that as part of my select against the View. If it were a stored procedure, the date would be a parameter.
If this were an Indexed View, should I expect to get better performance out of it then a stored procedure that's had an opportunity to cache the execution path? Or would the proc be faster? Or would
the difference be negligible? I know we could say "just try both out" but there are too many factors that could falsely bias the results, so I'd like to hear more of the theory behind it and what the expected outcomes are instead.
Thanks!

Very cool. Thanks Dan. One question though. You said "
If you are using SQL Server Enterprise Edition, you do not need to select from the view directly. " I'm not sure what you mean here. Where would I selecting from if not from the view?
Thanks again!
What I mean is that if your query is semantically similar to the same query encapsulated in the view, the optimizer may be able to use the view index even though you specify the table in the query. For example, each of the queries below will scan
the view index in Enterprise (or Developer) edition instead of the underlying table:
CREATE VIEW dbo.vw_myTable
WITH SCHEMABINDING
AS
SELECT colFDate, colA, colB, SUM(colC) AS colC, SUM(colD) AS colD, colE, COUNT_BIG(*) AS countbig
FROM dbo.myTable
GROUP BY colA, colB, colE, colFDate
GO
CREATE UNIQUE CLUSTERED INDEX cdx_vw_myTable ON
dbo.vw_myTable(colA, colB, colE, colFDate);
GO
SELECT colA, colB, SUM(colC), SUM(colD), colE
FROM dbo.myTable
WHERE colFDate < '20110903'
GROUP BY colA, colB, colE;
GO
SELECT colA, colB, SUM(colC), SUM(colD), colE
FROM dbo.vw_myTable
WHERE colFDate < '20110903'
GROUP BY colA, colB, colE;
GO
SELECT colA, colB, SUM(colC), SUM(colD), colE
FROM dbo.vw_myTable WITH (NOEXPAND)
WHERE colFDate < '20110903'
GROUP BY colA, colB, colE;
GO
Dan Guzman, SQL Server MVP, http://www.dbdelta.com

Is it proper to use indexed views as the source of your cubes

I understand that you're supposed to use views as the source of your SSAS cube because it provides a layer of abstraction and allows you to make schema changes without adversely effecting the cube. I also know that when you have users accessing the warehouse
you should use indexed views. However I just ran across this little gem:
"With schema binding, if the base object is bound to another object, you will not be able to modify the base object unless you drop or alter the object to remove the schema binding."
That seems to run contrary to the goal of abstraction, that is, if I'm reading that correctly. What am I missing?

You should use schema bound / indexed views very little. They have high overhead associated with them.
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This is by design.

How to Avoid Redundant Indexes on Indexed Views

Let's say I have an indexed view - so far it only has a clustered index. I want to avoid redundant indexes. So let's say the view joins Customers and Orders. If I've already put a nonclustered index on every column in both base tables, it's a pretty sure
bet that adding nonclustered indexes to the view will be redundant, right? Or not? I'm not understanding this.

The indexes on the view are not redundant even if on the same columns as the base tables. The indexes on view columns materialize the result after joins and aggregations in the view query.
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Dan Guzman, SQL Server MVP, http://www.dbdelta.com

Warning: Full-text change tracking is currently enabled for table or indexed view 'fim.ObjectValueString'

Hi,
As per the FIM best practice guide, we are trying to disable full-text indexing on the FIM Service database, during the initial load using:
ALTER FULLTEXT INDEX ON [fim].[ObjectValueString] SET CHANGE_TRACKING = MANUAL
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<Going through old threads>
This doesn't disable change tracking it merely sets it to manual.
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http://technet.microsoft.com/en-us/library/ms187025(v=sql.105).aspx
David Lundell, Get your copy of FIM Best Practices Volume 1 http://blog.ilmbestpractices.com/2010/08/book-is-here-fim-best-practices-volume.html

MS SQL Server Indexed View in Data Modeler

Hi All,
I'm fairly new to Data Modeler. Tried to search the forums for this but couldn't find anything. I'm trying to figure out how to create (in a SQL Server 2008 physical model) a view with a clustered index in Data Modeler v. 3.3. Seems like it is supported per the below link, however I can't seem to find a reference to it in the application.
http://www.oracle.com/technetwork/developer-tools/datamodeler/featurelist-167684.html
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Thanks,
Jeff

Hi Jeff,
you need to create/open physical model for MS SQL Server and find view presentation there. Set the view property "Schema Binding" to yes.
However I see some problems in definition of such index and DDL generation for view and logged a bug for that.
Philip

Is it NOT possible to create indexes on views using SSMS?

I'm looking at:
http://www.mssqltips.com/sqlservertip/1610/sql-server-schema-binding-and-indexed-views/
The thing is I'm not able to find that index dialogue ANYWHERE. When I google I keep coming up with examples of how to create indexes using TSQL. Is there no way to create an index on an view with SSMS?
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Expand Views -> expand view -> right click Indexes - > new index

View cluster index affecting performance

Hi All,
We have a simple delete and insert script for a table, but the table has a dependency to 2 view cluster index, So whenever am going to insert and update the parent table it is going to update the view cluster index, But while updating the view cluster index
it runs the view cluster index again (like executing the view) hence it affect the performance.
Please advise Is there any way to skip the view execution? because this view is already a heavy operation with many logial reads..
Also advise view cluster index in simple terms because when i google I can not get a concrete answers. Since it's a index can we rebuild or reorg? forgive if my question is stupid... :)
Best Regards Moug

Hi,
There's a good review here on designing indexed views, just for your curiosity - https://technet.microsoft.com/en-us/library/ms187864%28v=sql.105%29.aspx?f=255&MSPPError=-2147217396
There is no way to skip updating the view if it is a clustered view. It has to maintain the integrity of the data, so if it's an indexed view, when the table is updated in any way, it will also have to update the view. As you are seeing, there is a penalty
to this.
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when you rebuild the index.
Also, yes, you can treat it as a standard index and rebuild/reorg it with all of your other indexes.
Thanks,
Stephen
Please click "Mark as Answer" if you found my post helpful. Thanks, Stephen.

32-bit iFilter with Reader 11.0.10 cannot be found by SQL 2012 Fulltext Indexing on Windows 7 32 bit. How can I fix this?

I have verified that a record shows up in the fulltext system components (EXEC sys.sp_help_fulltext_system_components 'filter').
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I found the solution. Here it is:
Take backup of below registry key.
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Then delete the braces.
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http://social.msdn.microsoft.com/Forums/sqlserver/en-US/56f14665-3f00-41ff-b002-bb5e86b3f219/sql-server-not-starting-fallback-certificate-initialization-failed?forum=sqlsecurity
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View Vs temp table

can anyone please explain me the differnce of having a view replaced with a temp table.
the reason i am asking is one of our jobs takes 4 hours to complete using a view, if the same view is replaced by a table, it just takes 20 minutes. If the base tables are being modified, will the results be the same for both , ie using a view vs a temp table in place of a view..pls help..thnks in advnace.
Niki

P.S. If the view is indexed (materialized) all bets are off!
This is not true, and SQL Server does not work in the manner that other products like Oracle would in this aspect. Indexed Views are updated as the data changes in the tables as a part of the transaction changing the information. This is why there are limitations and criteria that govern what kinds of views can be indexed or not (ie, no self joins).
Jonathan Kehayias
http://sqlblog.com/blogs/jonathan_kehayias/
http://www.sqlclr.net/
Please click the Mark as Answer button if a post solves your problem!

View on DB Table

I want to create a view on DB Table eg CSKS. Can anyone show me how to do this or Show me where I can find information to create view on DB Table.
Thanks.

hi anil,
In database theory, a view is a virtual or logical table composed of the result set of a query. Unlike ordinary tables (base tables) in a relational database, a view is not part of the physical schema: it is a dynamic, virtual table computed or collated from data in the database. Changing the data in a table alters the data shown in the view.
The result of a view is stored in a permanent table whereas the result of a query is displayed in a temporary table.
Views can provide advantages over tables;
They can subset the data contained in a table
They can join and simplify multiple tables into a single virtual table
Views can act as aggregated tables, where aggregated data (sum, average etc.) are calculated and presented as part of the data
Views can hide the complexity of data, for example a view could appear as Sales2000 or Sales2001, transparently partitioning the actual underlying table
Views take very little space to store; only the definition is stored, not a copy of all the data they present
Depending on the SQL engine used, views can provide extra security.
Views can limit the exposure to which a table or tables are exposed to the outer world
Just like functions (in programming) provide abstraction, views can be used to create abstraction. Also, just like functions, views can be nested, thus one view can aggregate data from other views. Without the use of views it would be much harder to normalise databases above second normal form. Views can make it easier to create lossless join decomposition.
Rows available through a view are not sorted. A view is a relational table, and the relational model states that a table is a set of rows. Since sets are not sorted - per definition - the rows in a view are not ordered either. Therefore, an ORDER BY clause in the view definition is meaningless and the SQL standard (SQL:2003) does not allow this for the subselect in a CREATE VIEW statement.
Read-only vs. updatable views
Views can be read-only or updatable. If the database system is able to determine the reverse mapping from the view schema to the schema of the underlying base tables, then the view is updatable. INSERT, UPDATE, and DELETE operations can be performed on updatable views. Read-only views do not support such operations because the DBMS is not able to map the changes to the underlying base tables.
Some systems support the definition of INSTEAD OF triggers on views. This technique allows the definition of logic that shall be executed instead of an insert, update, or delete operation on the views. Thus, data modifications on read-only views can be implemented. However, an INSTEAD OF trigger does not change the read-only or updatable property of the view itself.
Advanced view features
Various database management systems have extended the views from read-only subsets of data. The Oracle database introduced the concept of materialized views, which are pre-executed, non-virtual views commonly used in data warehousing. They are a static snapshot of the data and may include data from remote sources. The accuracy of a materialized view depends on the frequency or trigger mechanisms behind its updates. DB2 provides so-called materialized query tables (MQTs) for the same purpose. Microsoft SQL Server, introduced in the 2000 version, indexed views which only store a separate index from the table, but not the entire data.
Equivalency:
A view is equivalent to its source query. When queries are run against views, the query is modified. For example, if there exists a view named Accounts_view and the content is:
accounts view:
SELECT name,
       money_received,
       money_sent,
       (money_received - money_sent) AS balance,
       address,
FROM table_customers c
JOIN accounts_table a
    ON a.customerid = c.customer_id
The application would simply run a simple query such as:
Sample query
SELECT name,
       balance
FROM accounts_view
The RDBMS then takes the simple query, replaces the equivalent view, then sends the following to the optimiser:
Preprocessed query:
SELECT name,
       balance
FROM (SELECT name,
               money_received,
               money_sent,
               (money_received - money_sent) AS balance,
               address,
          FROM table_customers c JOIN accounts_table a
               ON a.customerid = c.customer_id        )
From this point on the optimizer takes the query, removes unnecessary complexity (i.e. it is not necessary to read the address, since the parent invocation does not make use of it) and then sends the query to the SQL engine for processing.
thanks
karthik
reawrd me if usefull

Adobe PDF iFilter 9 for 64-bit platforms does not index my PDF files with Digital Sign

Adobe PDF iFilter 9 for 64-bit platforms does not index my PDF files with Digital Sign, why?

hi Phillip
i am not sure what you mean
I downloaded the ifilter and installed it
then configured everything as shown in the pdf file
I tried indexing from scratch exactly as i did successfully in the other computer
and got some errors in the log file
i checked the sql server log and the event viewer logs and got :
Error '0x80004005' occurred during full-text index population for table or indexed view '[Pirsumim_ext_ck].[dbo].[T_PUBLICATIONS]' (table or indexed view ID '2073058421', database ID '14'), full-text key value 0x0000027A. Attempt will be made to reindex it.
The component 'PDFFilter.dll' reported error while indexing. Component path 'C:\Program Files\Adobe\Adobe PDF iFilter 9 for 64-bit platforms\bin\PDFFilter.dll'.
Informational: Full-text retry pass of Full population completed for table or indexed view '[Pirsumim_ext_ck].[dbo].[T_PUBLICATIONS]' (table or indexed view ID '2073058421', database ID '14'). Number of retry documents processed: 1. Number of documents failed: 1.
Changing the status to MERGE for full-text catalog "Pirsumim_ext_catalog_ck" (5) in database "Pirsumim_ext_ck" (14). This is an informational message only. No user action is required.
Informational: Full-text Auto population initialized for table or indexed view '[Pirsumim_ext_ck].[dbo].[T_PUBLICATIONS]' (table or indexed view ID '2073058421', database ID '14'). Population sub-tasks: 1
the same dll worked fine in another computer...
how can i see more details what is wrong with this dll ?
meidad

Indexed Views.

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