Triggers On Tables Underlying A Partitioned View

Jul 23, 2005

We have a partitioned view with 4 underlying tables. The view and each
of the underlying tables are in seperate databases on the same server.
Inserts and deletes on the view work fine. We then add insert and
delete triggers to each of the underlying tables. The triggers modify
a different set of tables in the same database as the view (different
than the underlying table). The problem is those triggers aren't fired
when inserting or deleteing via the view. Inserting or deleteing the
underlying table directly causes the the triggers to fire, but not when
the tables are accessed as a result of using the view.


Am I missing something? The triggers are 'for insert' and 'for
delete'. No 'instead of' or 'after' triggers.

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Query Server To Find All Partitioned Tables, Partition Name, Column Used, Partitioned By

Dec 17, 2007

I want to find a way to get partition info for all the tables in all the databases for a server. Showing database name, table name, schema name, partition by (maybe; year, month, day, number, alpha), column used in partition, current active partition, last partition (for date partitions I want to know if the partition goes untill 2007, so I can add 2008)

all I've come up with so far is:






Code Block

SELECT distinct o.name From sys.partitions p
inner join sys.objects o on (o.object_id = p.object_id)
where o.type_desc = 'USER_TABLE'
and p.partition_number > 1

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View / Underlying Column Definition Metadata

Mar 18, 2008

Have many views based on legacy tables that have different table and column names. Want to create a table that shows view table / column and underlying table column, e.g.

CREATE VIEW [dbo].[Branch]
AS
SELECT

divbra_id BranchID,
cmpny_id CompanyID,
divbra_cde BranchCode,
divbra_nme BranchName

FROM MyDatabase.dbo.divbranc

GO

is an existing view. I want to pull out the following metadata:

divbranc divbra_id Branch BranchID
divbranc cmpny_id Branch CompanyID
divbranc divbra_cde Branch BranchCode
divbranc divbra_nme Branch BranchName

Is there anyway to get this from SQL metadata without actually parsing the view SELECT statement in code?

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Can A View Be Used To Modify More Than One Underlying Table With A Single Statement In MS SQL?

Mar 20, 2008

What's the answer for this and how ? If it is yes then How ?

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Permission On View. Is There Way To Avoid Granting Persmission On The Underlying Table?

Jul 13, 2007

I want to grant access on the below view for an end user so that he connect to our SQL server and retrieve data. The view looks like the below


CREATE VIEW DB1.[dbo].[View1]
AS
-- For brevity, I made it as simple statement.
SELECT *
From DB2.dbo.table2
GO

For the above view, it looks like I have to grant select and connect permission for the DB1. [dbo].[View1] as well as DB2.dbo.table2.

1. Is my understanding correct?

2. I want the user to access only DB1. [dbo].[View1] and not the underlying tables. Is there a way to grant access only on the view and execute the statement on a different security context so that the user can€™t access DB2.dbo.table2 directly?

3. When the user uses SQL Server Management Studio to connect to SQL server, he is able to connect and select DB2.dbo.table2 directly. Is there any way to restrict user from viewing and executing select statement on DB2 database from SQL Server Management Studio

Thanks in advance for your help

With regards
Ganesh

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Partitioned View

Mar 6, 2006

Hi! This is my first post and I really need help with Partitioned View. I'm using Sql Server 2000 and I created a partitioned view using 6 tables and now a need to create the table '7' and alter the view. But when i'm trying to insert new data i'm receiving the message: :eek:
"Server: Msg 4416, Level 16, State 5, Line 1
UNION ALL view 'tb_sld_cob_pap' is not updatable because the definition
contains a disallowed construct."

My code is:

drop VIEW tb_sld_cob_pap
GO
CREATE TABLE dbo.tb_sld_cob_pap_7 (
cod_operacao int NOT NULL ,
cod_contrato int NOT NULL ,
sequencial_duplicata int NOT NULL ,
data_sld_pap smalldatetime NOT NULL CHECK ([data_sld_pap] >= '20060201'),
liqex_dia_nom_outros float NULL ,
liqex_dia_moe_outros float NULL,
constraint pk_pap7 primary key (cod_operacao,cod_contrato,sequencial_duplicata,da ta_sld_pap)
)
GO
CREATE INDEX IdxSldCobPap7_1 ON dbo.tb_sld_cob_pap_7(cod_titulo, seq_titulo, data_sld_pap)
GO

CREATE INDEX IdxSldCobPap7_2 ON dbo.tb_sld_cob_pap_7(cod_operacao, seq_ctr_sacado, sequencial_duplicata, data_sld_pap)
GO

ALTER TABLE dbo.tb_sld_cob_pap_6
DROP CONSTRAINT CK__tb_sld_co__data___6C190EBB
GO

ALTER TABLE dbo.tb_sld_cob_pap_6 ADD CONSTRAINT
CK__tb_sld_co__data___6C190EBB CHECK (((([data_sld_pap] >= '20051201') and ([data_sld_pap] < '20060201'))))
GO

create VIEW tb_sld_cob_pap
as
select * from tb_sld_cob_pap_1
union all
select * from tb_sld_cob_pap_2
union all
select * from tb_sld_cob_pap_3
union all
select * from tb_sld_cob_pap_4
union all
select * from tb_sld_cob_pap_5
union all
select * from tb_sld_cob_pap_6
union all
select * from tb_sld_cob_pap_7

My table tb_sld_cob_pap_6 does NOT have data with ([data_sld_pap] >= '20060201').
I'm using this script in other database and I don't have this problem.



Thank you...

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Partitioned View

Jun 18, 2007

USE Northwind
GO

CREATE TABLE myTable99_1 (
Accountchar(3)
, Ledgerchar(4)
, PostDatedatetime
, PRIMARY KEY (Account, Ledger)
, CHECK(PostDate> '1/1/1999' and PostDate < '12/31/1999 23:59:59'))
CREATE TABLE myTable99_2 (
Accountchar(3)
, Ledgerchar(4)
, PostDatedatetime
, PRIMARY KEY (Account, Ledger)
, CHECK(PostDate> '1/1/2000' and PostDate < '12/31/2000 23:59:59'))
CREATE TABLE myTable99_3 (
Accountchar(3)
, Ledgerchar(4)
, PostDatedatetime
, PRIMARY KEY (Account, Ledger)
, CHECK(PostDate> '1/1/2001' and PostDate < '12/31/2001 23:59:59'))

CREATE INDEX myTable99_1_IX ON MyTable99_1
(Account, Ledger)
CREATE INDEX myTable99_2_IX ON MyTable99_2
(Account, Ledger)
CREATE INDEX myTable99_3_IX ON MyTable99_3
(Account, Ledger)
GO

CREATE VIEW myView99
AS
SELECT Account
, Ledger
, PostDate
FROM myTable99_1
UNION ALL
SELECT Account
, Ledger
, PostDate
FROM myTable99_2
UNION ALL
SELECT Account
, Ledger
, PostDate
FROM myTable99_3
GO

SELECT * FROM myView99 WHERE Account = 1 AND Ledger = 1
GO

DROP VIEW myView99
DROP TABLE myTable99_1, myTable99_2, myTable99_3
GO



OK, so I thought I knew this, but I'm looking for parallelism...not only am I no getting it, I'm getting an Index scan....is it becuse I didn't put any data in the table? I thought it would stil show my index seek with parallelism

What up, homey?

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Updating Across A Partitioned View

Mar 7, 2012

This post concerns updating across a partitioned view, and not unlike others about this subject I am getting this error:

Msg 4436, Level 16, State 12, Line 1
UNION ALL view 'dbII.dbo.MyTable' is not updatable because a partitioning column was not found.

I am aware of the rules for defining a partitioning column, but interpreting them may have beaten me. So perhaps I haven't abided by all the rules. How to spot which one(s) from the view and table definitions? I suspect the CHECK constraint does not allow the ASCII function, but I can't see how to avoid using it given SYSCODE entries in one table are like "[A-Z]%" and in the other are like "[0-9]%".

Otherwise, I suspect it is because one of the tables has, by legacy, a text column and the view is casting it to varchar(MAX). I also suspect it is because there's a second column with a unique index. These aren't mentioned in the rules (are they?).

Here's the view definition:

SELECT SYSCODE, COL2, CAST(COMMENTS AS varchar(MAX)) AS COMMENTS
FROM dbo.MYTABLE
UNION ALL
SELECT SYSCODE, COL2, COMMENTS
FROM OTHERDATABASE.dbo.MYTABLE AS MYTABLE_1

And here are the table definitions:

-- Table in the database where view is defined
CREATE TABLE [dbo].[MYTABLE](
[SYSCODE] [char](12) NOT NULL,

[Code]....

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Partitioned View Problem

Oct 18, 2007

Hi all,

I am designing 3 p:artitioned views for 3 tables. Those tables grow up in 1.5 millions of rows per month (each one), so I decided to partition those tables monthly. The issue is that if I want to create the views with more than 256 months (256 tables) SQL Server says: 'Server: Msg 106, Level 15, State 1, Procedure Jugadas, Line 258Too many table names in the query. The maximum allowable is 256.'

Is there any workaround for this?

Another solution maybe?

PD1: I've tested with less than 256 tables and it works fine, I can update and query the tables (except for a couple of querys where I've got to join 2 or more of the involucred views in which case I got a similar error saying about a 260 table limit).

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Partitioned View Question

Nov 13, 2007



I have a table that I'm trying to scale out into a partitioned view. It's about 30 million rows. It's a workflow table and I have a taskID in the table. Originally the table was partitioned on this column but performance still wasn't what I wanted it to be, so we figured out how we could partition on a bit flag of IsOpen.

Question #1) Anyone know a best practice for creating apartitioned views on multi-columns?

What I'd like to try to do to lower the complexity of the original partitioned view is to create a view of partitioned views. Is this even possible (This is Q#2, BTW).

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SQL 2012 :: Allow User To Select Data Through A View But Not Restrict Access To Underlying Table?

Sep 29, 2015

I have two databases DB1 and DB2 DB1 has a source table named 'Source' I have created a login 'Test_user' in DB2 with Public access. I have also created a view named 'Test_view' in DB2 which references data from DB1.dbo.Source

How can I do the following: AS A Test_user

SELECT * FROM DB2.dbo.Test_view --Should work

SELECT * FROM DB1.dbo.Source --Should Not work

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Transact SQL :: Allow A User To Select Data Through A View But Not Restrict Access To Underlying Table

Sep 29, 2015

I have two databases DB1 and DB2 DB1 has a source table named 'Source' I have created a login 'Test_user' in DB2 with Public access. I have also created a view named 'Test_view' in DB2 which references data from DB1.dbo.Source

How can I do the following: AS A Test_user

SELECT * FROM DB2.dbo.Test_view --Should work

SELECT * FROM DB1.dbo.Source --Should Not work

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Updating A Partitioned View In A Cursor

Jan 13, 2004

I have a partitioned view defined by a UNTION ALL of member tables. I can update the member tables through the view without any problem. However, when I declare a cursor on this partitioned view and try to update the view using WHERE CURRENT OF, I get an error saying 'The target object type is not updatable through a cursor'. Does anyone know if it's the case that updating a partitioned view through cursor is not supported in SQL Server 2000?

Thanks

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SQL 2012 :: Partitioned View Over Two Databases

Sep 8, 2014

I have database with a large table (30 Billion rows) because it is so big I separated the data in quarterly tables and created a partitioned view (with hints for the date column) about 1 billions a quarter. (all in separated filegroups). The tables themselfes are partitioned by date again, so you slice out one day

However the full-backup of grows and grows and the mainpart of it is "old" but needed data.

So I was thinking to put the older data in a separate database (with separated backup) and then point to the table in my view.

While this is technical possible (leaving out the WITH SCHEMABINDING) I wonder what negative consequences it will have.

I already had to lose "with schemabing".

I have to use separate partioning functions - for each database its own - (partition schemas where already separated due to separated filegroups)

What about query optimization, does the optimizer care that there are two databases?

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Will This Query Be Optimized For A Partitioned View?

Jul 20, 2005

Hello :-)My question is: If I query a partitioned view, but don't know the valuesin the "where x in(<expression>)" clause, i.e.: select * from viewAwhere intVal in(select intVal from tbl1) . Compared to: select * fromviewA where intVal in(5,6).Of course "intVal" is partitioning column.Will this result in an optimized query that searches only the relevanttables?*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!

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Partitioned View With Computed Column

Jan 23, 2008

Using SQL Server 2005. Defined partitioned view with computed column. Computed column was a constant varchar. Ran a SELECT. According to Query Execution Plan, SQL did recognize the computed column as the partitioning column and used it to optimize the query.

However MSDN says a computed column cannot be used as the partitioning column.

Could someone from MS clarify?

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Optimization Of Query On Partitioned View

May 27, 2008

Schema below.

The execution plan shows that this query is correctly optimized to check only the underlying Employee_2008 table.

select * from Employee where ReportingYear = '2008'

This query is not optimized and checks both Employee_2008 and Employee_2007:

declare @ry varchar(4)
set @ry = '2008'
select * from Employee where ReportingYear = @ry

How can I get second query to be optimized correctly?

Schema:

CREATE TABLE [dbo].[Employee_2007](
[EmployeeID] [int] NOT NULL,
[Name] [varchar](50) NOT NULL
) ON [PRIMARY]

CREATE TABLE [dbo].[Employee_2008](
[EmployeeID] [int] NOT NULL,
[Name] [varchar](50) NOT NULL
) ON [PRIMARY]

CREATE VIEW [dbo].[Employee]
AS
SELECT
'2007' ReportingYear,
EmployeeID,
Name
FROM Employee_2007

UNION ALL

SELECT
'2008' ReportingYear,
EmployeeID,
Name
FROM Employee_2008

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Partitioned View &&amp; Computed Column..

May 14, 2006

Hello,

please enlighten me regarding an issue with partitioned view... There are 3 tables in my DB of a similar structure:

CREATE TABLE Table1 (value1 varchar(1))
CREATE TABLE Table2 (value1 varchar(1))
CREATE TABLE Table3 (value1 varchar(1))

INSERT INTO Table1 (value1)
SELECT 'a' UNION SELECT 'b' UNION SELECT 'c'

INSERT INTO Table2 (value1)
SELECT 'a' UNION SELECT 'b' UNION SELECT 'c'

INSERT INTO Table3 (value1)
SELECT 'a' UNION SELECT 'b' UNION SELECT 'c'

As sometimes we need to access all data from these tables, a view has been created:

CREATE VIEW AllData AS
SELECT value1, '1' as table_id from Table1
UNION ALL
SELECT value1, '2' as table_id from Table2
UNION ALL
SELECT value1, '3' as table_id from Table3

The problem is that while running a query like

SELECT * from AllData WHERE value1 = 'a' and table_id = '3'

I see a table scan being performed on all 3 tables, not just table3 - i.e optimisation engine doesn't care for my table_id computed column and for that fact that required data is located ONLY in Table3.

Is there any way to force optimiser to consider this column andrrebuild a plan? If not - how can I rebuild a view (I can't modify tables) to achieve that? Maybe create an index for a view?

Thanks in advance. RTFM and search don't seem to clarify this for me...

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Distributed Partitioned View With RPC (or DTC) Problem

Oct 5, 2007

I am setting up 3 Linked Servers (SERVER_A, SERVER_B and SERVER_C) in an isolated local network. They are all running SQL Server 2005 Developer Edition, all on XP SP2. On each server, I have a distributed partitioned view named WAREHOUSE_ALL that basically is the UNION of all WAREHOUSE tables.

I am having trouble in running write (INSERT, UPDATE or DELETE) queries on the distributed partitioned view. The error returned was (run from SERVER_B)

OLE DB provider "SQLNCLI" for linked server "SERVER_A" returned message "No transaction is active.". Msg 7391, Level 16, State 2, Line 7The operation could not be performed because OLE DB provider "SQLNCLI" for linked server "SERVER_A" was unable to begin a distributed transaction.

However, executing a read (SELECT) query ran smoothly without error.

I have done all the steps required as described in the article at http://support.microsoft.com/?kbid=873160 . Note that the only difference between the situation and our situation is the provider (SQLOLEDB and SQLNCLI), which I guess does not important. Unfortunately, the error still comes out.

After reading heaps of other article, I suspected that there is something wrong with MSDTC. As far as I know, all the settings for MSDTC were set accordingly. Then, I ran DTCPing - http://www.microsoft.com/downloads/details.aspx?FamilyID=5e325025-4dcd-4658-a549-1d549ac17644&DisplayLang=en and the error returned was
DTCping log file: C:Documents and SettingsAdministratorDesktoplSERVER_B2496RPC server is ready
Please Start Partner DTCping before pinging
++++++++++++Validating Remote Computer Name++++++++++++
Please refer to following log file for details:
C:Documents and SettingsAdministratorDesktoplSERVER_B2496.log
Invoking RPC method on SERVER_C
Problem:fail to invoke remote RPC method
Error(0x5) at dtcping.cpp @303
-->RPC pinging exception
-->5(Access is denied.)
RPC test failed

And here is the log file:


Platform:Windows XP
IP Configure Information
Host Name . . . . . . . . . : SERVER_B
DNS Servers . . . . . . . . : 129.78.99.2
Node Type . . . . . . . . . :
NetBIOS Scope ID. . . . . . :
IP Routing Enabled. . . . . : no
WINS Proxy Enabled. . . . . : no
NetBIOS Resolution Uses DNS : no

Ethernet adapter {4404F3CB-F4B7-4990-912C-E69721C885B1}:

Description . . . . . . . . : 3Com EtherLink XL 10/100 PCI TX NIC (3C905B-TX) #2 - Packet Scheduler Miniport
Physical Address. . . . . . : 00-01-02-85-B8-A9
DHCP Enabled. . . . . . . . : no
IP Address. . . . . . . . . : 172.19.102.35
Subnet Mask . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . : 172.19.102.250
DHCP Server . . . . . . . . : 255.255.255.255
Primary WINS Server . . . . : 0.0.0.0
Secondary WINS Server . . . : 0.0.0.0
Lease Obtained. . . . . . . : Thu Jan 01 00:00:00 1970
Lease Expires . . . . . . . : Thu Jan 01 00:00:00 1970

++++++++++++lmhosts.sam++++++++++++

++++++++++++hosts ++++++++++++
127.0.0.1 localhost

++++++++++++++++++++++++++++++++++++++++++++++
DTCping 1.9 Report for SERVER_B
++++++++++++++++++++++++++++++++++++++++++++++
RPC server is ready
++++++++++++Validating Remote Computer Name++++++++++++
10-05, 17:10:54.769-->Start DTC connection test
Name Resolution:
SERVER_C-->172.19.102.36-->SERVER_C
10-05, 17:11:09.781-->Start RPC test (SERVER_B-->SERVER_C)
Problem:fail to invoke remote RPC method
Error(0x5) at dtcping.cpp @303
-->RPC pinging exception
-->5(Access is denied.)
RPC test failed


I guess it could be due to port problem, which I have already opened in the Windows Firewall. There is one article which is confusing me -> Update to automatically open port 135 in Windows Firewall when a TCP or a UDP RPC server registers with the endpoint mapper at http://support.microsoft.com/kb/838191 (This article shows automatic opening of port 135!)

Please help me. Thanks.

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Bulk Insert In To A Partitioned View?

May 24, 2006

Greetings once again my SQL friends,

I am getting the following error when I attempt to complete my data flow task. The destination is a partitioned view but I get the following error message when I run the package :

Partitioned view 'PRICE_DIM' is not updatable as the target of a bulk operation



How to solve this problem?

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Insertion Faild In Partitioned View In Sql Server 7.0

Dec 7, 2000

I have a problem while I try to insert data into a partioned view I am
getting the following error.

Server: Msg 4436, Level 16, State 12, Line 9
UNION ALL view 'sales_all' is not updatable because a partitioning column
was not found.

Any thoughts

USE pubs

CREATE TABLE sales_monthly
( sales_month int NOT NULL ,
sales_qty int NOT NULL
)
GO
CREATE TABLE sales_jan
( sales_month int NOT NULL,
sales_qty int NOT NULL
)
GO
CREATE TABLE sales_feb
( sales_month int NOT NULL,
sales_qty int NOT NULL
)
GO

ALTER TABLE sales_feb WITH NOCHECK ADD
CONSTRAINT PK_sales_feb PRIMARY KEY CLUSTERED
( sales_month
) ,
CONSTRAINT CK_sales_feb CHECK (sales_month = 2)
GO

ALTER TABLE sales_jan WITH NOCHECK ADD
CONSTRAINT PK_sales_jan PRIMARY KEY CLUSTERED
( sales_month
) ,
CONSTRAINT CK_sales_jan CHECK (sales_month = 1)
GO

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Unable To Create A Partitioned Indexed View

Jul 25, 2005

Hi,

While creating an indexed view with the command :

create unique clustered index idx_atrid on account_transactions (policy)

there is a check constraint on the policy column of the tables used in this view.

The following error is encountered

Cannot index the view 'test.dbo.account_transactions'. It contains one or more disallowed constructs.

Can anyone help?

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Query Against Partitioned View Is Not Optimized Due To CONVERT_IMPLICIT

Nov 2, 2007

We have a situation where queries against a partitioned view ignore a suitable index and perform a table scan (against 200+MB of data), where the same query on the underlying table(s) results in a 4 page index seek. I can€™t find any mention of the situation, so I€™m trying a post here.


We€™re running SQL Server 2005 Enterprise edition sp2 on Windows 2003 Enterprise Edition sp1 on a two node cluster, and it also occurs on a stand-alone development box with Developer edition. We have four tables, named Options#0, Options#1, Options#2, and Options#3. All are almost identical (script generated by SSMS and edited down a bit):


SET ANSI_NULLS OFF
SET QUOTED_IDENTIFIER ON

CREATE TABLE [dbo].[Options#0](
[ControlID] [tinyint] NOT NULL CONSTRAINT [DF_Options#0__ControlID] DEFAULT ((0)),
[ModelCode] [char](8) NOT NULL,
[EquipmentID] [int] NOT NULL,
[AdjustmentContextID] [int] NOT NULL,
[EquipmentCode] [char](2) NOT NULL,
[EquipmentTypeCode] [char](1) NOT NULL,
[Description] [varchar](50) NOT NULL,
[DisplayOrder] [smallint] NOT NULL,
[IsStandard] [bit] NOT NULL,
[Priority] [tinyint] NOT NULL,
[Status] [bit] NOT NULL,
[Adjustment] [int] NOT NULL,
CONSTRAINT [PK_Options#0] PRIMARY KEY CLUSTERED
(
[ModelCode] ASC,
[EquipmentID] ASC,
[AdjustmentContextID] ASC,
[ControlID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]


ALTER TABLE [dbo].[Options#0] WITH CHECK ADD CONSTRAINT [CK_Options#0__ControlID] CHECK (([ControlID]=(0)))


ALTER TABLE [dbo].[Options#0] CHECK CONSTRAINT [CK_Options#0__ControlID]


The only differences between the tables are in the names and in the value defaulted to and CHECKed, which matches the table name (to support the partitioned view, of course).


We receive and load data ever week and every two month, and use an unlikely algorithm to load and manage its availability by running an ATLER on the view (to maintain the access rights defined for the hosting environment). Scripted out via SSMS, the view looks like:


SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
CREATE VIEW [dbo].[Options] AS select * from Options#1 union all select * from Options#3


The problem is that when we issue a query like


SELECT count(*)
from Options
where ControlID = 1
and ModelCode = '2004NIC9'


The resulting query (as checked via the query plan and SET STATISTICS IO on) will get €œpartitioned€?, running against the proper table, but it will ignore the query, perform a table scan, and churn through 200+MB of data. A Similar query run against the underlying table


SELECT count(*)
from Options#1
where ControlID = 1
and ModelCode = '2004NIC9'


(with or without the ControlID = 1 clause) will perform a Clustered Index Seek and read maybe 4 pages.


Analyzing the execution plan shows that the table query work like you€™d think, but for the query against the view we get a Clustered Index Scan, with predicate:


[DBName].[dbo].[Options#1].[ControlID]=(1) AND CONVERT_IMPLICIT(char(8),[ DBName].[dbo].[Options#1].[ModelCode],0)=€™2004NIC9€™


I get the same results when explicitly listing all columns in the view. The code page on the view and tables is the same (as determined by checking properties via SSMS).


Why is the table data column being implicitly converted to the data type that it already is? Why does this occur when working with the partitioned view but not with the actual table? Can this behavior be controlled or modified without losing the (incredibly useful) data loading management benefits of the partitioned view? I€™m guessing (and hoping) it€™s some subtle quirk or mis-setting, please set me on the right path!


Philip Kelley

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Incorrect Query Plan With Partitioned View On SQL 2000

Jun 19, 2001

I have a partitioned view containing 4 tables (example follows at end)

The query plan generated on a select correctly accesses just one of the tables

The query plan generated on an update always accesses all four of the tables. I thought that it should only access the partition required to satisfy the update. Can anyone please advise whether:
a) Is this is expected behaviour?
b) Is the partitioned view incorrectly configured in some way?
c) Is there is a known bug in this area

Note that the behaviour is the same with SP1 on SQL2000

I would be very grateful for any advice

Thanks

Stefan Bennett

Example follows

--Create the tables and insert the values
CREATE TABLE Sales_West (
Ordernum INT,
total money,
region char(5) check (region = 'West'),
primary key (Ordernum, region)
)
CREATE TABLE Sales_North (
Ordernum INT,
total money,
region char(5) check (region = 'North'),
primary key (Ordernum,region)
)
CREATE TABLE Sales_East (
Ordernum INT,
total money,
region char(5) check (region = 'East'),
primary key (Ordernum,region)
)
CREATE TABLE Sales_South (
Ordernum INT,
total money,
region char(5) check (region = 'South'),
primary key (Ordernum,region)
)
GO

INSERT Sales_West VALUES (16544, 2465, 'West')
INSERT Sales_West VALUES (32123, 4309, 'West')
INSERT Sales_North VALUES (16544, 3229, 'North')
INSERT Sales_North VALUES (26544, 4000, 'North')
INSERT Sales_East VALUES ( 22222, 43332, 'East')
INSERT Sales_East VALUES ( 77777, 10301, 'East')
INSERT Sales_South VALUES (23456, 4320, 'South')
INSERT Sales_South VALUES (16544, 9999, 'South')
GO

--create the view that combines all sales tables
CREATE VIEW Sales_National
AS
SELECT *
FROM Sales_West
UNION ALL
SELECT *
FROM Sales_North
UNION ALL
SELECT *
FROM Sales_East
UNION ALL
SELECT *
FROM Sales_South
GO

--Look at execution plan for this query
-- This correctly only accesses the South partition
SELECT *
FROM sales_national
WHERE region = 'south'

-- Look at execution plan for update
-- This accesses all partitions - Why?
update sales_national
set total = 100
where ordernum = 23456;

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Is it possible I don't have permissions?

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I have created a view with the following code:

ALTER view dbo.FactView
with schemabinding
as
select local_date_key, meter_key, unit_key, read_type_key, sum(isnull(read_value,0)) as [s_read_value], sum(isnull(cost,0)) as [s_cost]
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I then followed this up by running some large calculations that required use of the aggregation functionality on the main fact table, grouping by the clustered index columns and only returning averages and sums that are available in the view, but it still uses the underlying table to perform the aggregations, rather than the view I have created. Running an equivalent query on the view, then it takes 75% less time to query the indexed view directly, to using the fact table. I think the expected behaviour was that in SQL Server Enterprise or Developer edition (I am using developer edition), then the fact table should have used the indexed view. what I might be missing, for the query not to be using the indexed view?

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This one has me stumped.

I created an updateable partioned view of a very large table. Now I get an error when I attempt to declare a CURSOR that SELECTs from the view, and a FOR UPDATE argument is in the declaration.

There error generated is:

Server: Msg 16957, Level 16, State 4, Line 3

FOR UPDATE cannot be specified on a READ ONLY cursor



Here is the cursor declaration:



declare some_cursor CURSOR

for

select *

from part_view

FOR UPDATE



Any ideas, guys? Thanks in advance for knocking your head against this one.

PS: Since I tested the updateability of the view there are no issues with primary keys, uniqueness, or indexes missing. Also, unfortunately, the dreaded cursor is requried, so set based alternatives are not an option - it's from within Peoplesoft.

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Mar 19, 2008



Hello,

I am implementing a table partitioning on our database with TSQL.
At the moment (it is under developing) the data are correctly located in the relavant file group.
Our target is to meke that the oldest partions/File groups can be backup and removed from the database. This to reduce the size of DB (time period is used for partitioning).
Then, if the need arises, restoring the filegroup to make reporting or analysis.
Take care that data are conitnuosly added and thus new File groups are added to represent the new time period (eg: new file group is the new month).
Based on your experience is it possible a solution like that?


Thank

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Sep 28, 2007

When do partitioned tables/indexes become beneficial? When a table has several million rows? Hundreds of millions of rows?

My tables all have clustered indexes based on the bigint identity PK. I am considering partitioning some of the larger tables by year. If the field I use is not part of the current clustered index then I can't use create index to create my partitions? I need to create an empty table for each year and then use the Alter Table switch? I have header/detail/sub-detail tables. As long as I create the partition function using a similar date field the partitions will be able to be joined? How do I insure my indexes will be aligned? Once I set up the partitions I assume new rows will be stored in the proper partitions based on the value of the date field.

I've read BOL, etc & they are good sources for theory but I need a "Building Partitions for Dummies" type paper with step by step explanations. Anything out there like that?

Thanks.

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Hello all,
I was wondering if anyone else ran into this and if how you got around it.
In a nut shell the SQL optimizer it NOT pruning the additional partitions from the execution plan as would be expected when applying a constraint directly against the partitioned table€™s partition key, Instead its scanning every partition that you have set up in you partition function range.. Yet when you apply the actual value against the table the plan return as expected.



Hmm.... strange......ghost...ooooooo?

I have created a simple test to reproduce:






Code Snippet

CREATE PARTITION FUNCTION [PTFunction](int) AS RANGE LEFT FOR VALUES (1,2,3)

GO

CREATE PARTITION SCHEME [PTDataScheme] AS PARTITION [PTFunction] TO ([PRIMARY], [PRIMARY], [PRIMARY], [PRIMARY])

GO

CREATE TABLE tblPartitionTest(

ID int identity(1,1) ,

PartitionKey int,

Sales money)

ON PTDataScheme(PartitionKey)

GO

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(1,10.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(1,20.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(1,30.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(1,40.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(1,50.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(2,10.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(2,20.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(2,30.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(2,40.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(2,50.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(3,10.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(3,20.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(3,30.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(3,40.00);

INSERT INTO tblPartitionTest(PartitionKey,Sales) VALUES(3,50.00);

set showplan_text on;

-- query using the set value as a constraint

select * from tblpartitiontest

where partitionkey = 2

--show plan text on result:

|--Table Scan(OBJECT:([tblPartitionTest]), WHERE:([tblPartitionTest].[PartitionKey]=(2)) PARTITION ID:((2)))

-- query using the parameter as a constraint

declare @param_partitionkey int

set @param_partitionkey = 2

select * from tblpartitiontest

where partitionkey = @param_partitionkey

--show plan text on result:

|--Table Scan(OBJECT:([tblPartitionTest]), WHERE:([tblPartitionTest].[PartitionKey]=[@param_partitionkey]) PARTITION ID:(RangePartitionNew([@param_partitionkey],(0),(1),(2),(3))))



BTW I have reproduce this in SP 2 as well.



Any thoughts?

Thanks

Eric





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