DB Design :: Column Store Index And Constraints
Oct 20, 2015can you have constraints as such [CreateBy] [nvarchar](30) NOT NULL DEFAULT (suser_sname()),on a table that has a column store index in SQL Server 2012,2014, or 2016?
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SQL 2012 :: Column Store Index Refresh
Aug 20, 2015When we use Partition switch and load the data to a table, can we refresh the indexes for specific partition, so that we don't need to rebuild / refresh for complete is this possible ?
View 1 Replies View RelatedTransact SQL :: Disadvantages Of Column Store Index
Nov 3, 2015What are the disadvantages of columnstore index in Sql Server 2012
View 4 Replies View RelatedSQL 2012 :: Store Attributes / Values In XML Column - Table Design
Oct 29, 2014I'd like to create a table that will store different order items. Several order items make up one single order. Order items can have 0 or more children (max depth will never be deeper than one). Order items can have up to 150 attributes/values. The way I think this should be done is using XML column instead of the EAV type of model. My table structure currently looks like this:
* child_order_item_id (PK)
* parent_order_item_id (FK to child_order_item_id)
* order_id (FK to Order table)
* product_id (FK to Product table)
* price
* attribute_XML
How my attribute_XML should look like or how to validate the xml.
Traditional Indexes Vs Clustered Column-store Index
Apr 3, 2015I've been asked to look at using Clustered Columnstore indexes for one of my tables. The table contains about 5 million records with about 50 columns. The max field size is a NVarchar(MAX) with max field length currently of about 4k characters. It's only about a gigabyte's worth of data. The table is about 50% R/W operations. Currently, we have multiple indexes with no clustered index due to some performance issues that happened in the past. I've been attempting to determine if it's even really worth it to switch over. I feel that the table is still fairly small with minimal columns and don't believe there will be any noticeable improvement over traditional indexing.
View 3 Replies View RelatedIndex Design Recommendation - Examine Column Uniqueness
Nov 30, 2005I am reading "SQL Server Query Performance Tuning Distilled",on page 104 it talks about one of the index design recommendationswhich is to choose the column that has very high selectivity of valuesinstead of a column that has very few selectivity of values.My question is if I have currently indexes on my tables that have1, 2, 3, 4, ... values only on thousands of rows, are these nonclusteredindexes pretty much useless indexes that I should get rid of?And I know that pretty much the number of selectivity values willalways remain very low.Thank you
View 1 Replies View RelatedDB Design :: Unable To Create Index After Column Resizing
Oct 5, 2015We have a vendor created database with 9000+ tables, one of which has about 6 billion rows. The vendor redesigned the database recently and ever since we've had terrible performance.
What the vendor did was increase any and all varchar columns (tens of thousands of columns) to 256.
Before the upgrade we had no problems creating an index on the 6billion row table, it would take 2 hours.
Now after the upgrade we've let the index creation command run for 5 days and killed it because it was consuming terabytes of logspace.
The previous design had combined column width of 1049 to what is now over 4000. The primary key itself is 1283 characters (SQL limit is 900).
There is no additional data, just wider columns. Why we are unable to create the index?
What is happening inside SQL Server? Does SQL make "room" in memory for the index for the entire width of the potential max row length?
DB Design :: Composite Clustered Index Key Based On Column
Nov 24, 2015I created composite clustered index key based on Gender and Salary column
The Query executed Successfully and <g class="gr_ gr_135 gr-alert gr_tiny gr_spell undefined ContextualSpelling multiReplace" data-gr-id="135" id="135">i</g>
got composite index key id Gender(-), Salary I <g class="gr_ gr_310 gr-alert gr_gramm undefined Grammar only-ins replaceWithoutSep" data-gr-id="310" id="310">want</g> know why Gender(-) display like this?
And Gender is <g class="gr_ gr_391 gr-alert gr_spell undefined ContextualSpelling ins-del multiReplace" data-gr-id="391" id="391">nvarchar</g> (20)
SQL Server 2012 :: Non-Clustered Column Store Index On Table
Jun 18, 2015I have created NONCLUSTERED index on table but my report is taking more time that's why i created columnstore NONCLUSTERED index on the same table but i have one query, if any table have row and column level index(same columns in index) . Which index query will consider.
View 1 Replies View RelatedSQL 2012 :: Disabling Column Store Index And Try Loading Data
Oct 17, 2015We have a typical issue with Column Store Index, we have a procedure which does 2 activities - Switch & Reverse Switch
Switch:
1. Fetch the Partitions needed to be switched
2. Switch the data from Main Table to Switch table
2. Disable the Column store on Switch table
SSIS Package:
3. Load data to Switch (Insert / Update)
Reverse Switch:
4. Enable the Switch
5. Switch back the data from Switch table to Main table
Issue: Some time the Column store is not getting disabled, and the package fails complaining try disabling the Column store index and try loading data.
If we re-run the procedure, the column store gets disabled.
Data Warehousing :: Creating A Table With Column Store Index?
Sep 26, 2015I am trying to create a sample table in the Azure SQL Data warehouse but its giving me a syntax error Incorrect syntax near the keyword 'CLUSTERED'.
CREATE TABLE [dbo].[FactInternetSales]
( [ProductKey] int NOT NULL
, [OrderDateKey] int NOT NULL
, [CustomerKey] int NOT NULL
, [PromotionKey] int NOT NULL
[Code] ....
what's the correct syntax
Transact SQL :: Getting List Of Clustered Column-store Index In A Database In 2014?
Sep 17, 2015How can we get the list of clustered columnstore index in a database in sql server 2014
View 3 Replies View RelatedSQL Server 2014 :: Indexed View Not Being Used For Partitioned Clustered Column-store Index?
Oct 9, 2015I am trying to use an indexed view to allow for aggregations to be generated more quickly in my test data warehouse. The Fact Table I am creating the indexed view on is a partitioned clustered columnstore index.
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]
, sum(isnull(easy_target_value,0)) as [s_easy_target_value], sum(isnull(hard_target_value,0)) as [s_hard_target_value]
, sum(isnull(read_value,0)) as [a_read_value], sum(isnull(temperature,0)) as [a_temp], sum(isnull(co2,0)) as [s_co2]
, sum(isnull(easy_target_co2,0)) as [s_easy_target_co2]
, sum(isnull(hard_target_co2,0)) as [s_hard_target_co2], sum(isnull(temp1,0)) as [a_temp1], sum(isnull(temp2,0)) as [a_temp2]
, sum(isnull(volume,0)) as [s_volume], count_big(*) as [freq]
from dbo.FactConsumptionPart
group by local_date_key, read_type_key, meter_key, unit_key
I then created an index on the view as follows:
create unique clustered index IDX_FV on factview (local_date_key, read_type_key, meter_key, unit_key)
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?
DB Design :: Unique And Check Constraints
Sep 3, 2015I have one table like below Test table. My requirement is to create constraints to confirm <g class="gr_ gr_331 gr-alert gr_gramm Grammar only-ins replaceWithoutSep" data-gr-id="331" id="331">uniqueness</g> of STID value 101 with LN.
like
ID - LN - STID
1 - 'ABC' - 101 ---- Valid Row
2 - 'ABC' - 202 --- Valid Row
3 - 'ABC' - 202 --Valid Row (as I want only unique when LN = 'ABC' with STID = 101)
4 - 'ABC' - 101 -- Invalid Row (As I want uniqueness base on LN and STID = 1011)
create table dbo.Test
(
ID int identity,
LN varchar(50),
STID bigint
)
Is this possible with constraints as I don't want to use <g class="gr_ gr_1041 gr-alert gr_gramm Grammar only-ins doubleReplace replaceWithoutSep" data-gr-id="1041" id="1041">trigger</g>.
Clustered Index On Client_ID+ORderNO+OrdersubNo, If I Create 3 Noncluster Index On Said Column Will It Imporve Performance
Dec 5, 2007
Dear All.
We had Teradata 4700 SMP. We have moved data from TD to MS_SQL SERVER 2003. records are 19.65 Millions.
table is >> Order_Dtl
Columns are:-
Client_ID varchar 10
Order_ID varchar 50
Order_Sub_ID decimal
.....
...
..
.
Pk is (ClientID+OrderId+OrderSubID)
Web Base application or PDA devices use to initiate the order from all over the country. The issue is this table is not Partioned but good HP with 30 GB RAM is installed. this is main table that receive 18,0000 hits or more. All brokers and users are using this table to see the status of their order.
The always search by OrderID, or ClientID or order_SubNo, or enter any two like (Client_ID+Order_Sub_ID) or any combination.
Query takes to much time when ever server receive more querys. some orther indexes are also created on the same table like (OrderDate, OrdCreate Date and Status)
My Question are:-
Q1. IF Person "A" query to DB on Client_ID, then what Index will use ? (If any one do Query on any two combination like Client_ID+Order_ID, So what index will be uesd.? How does MS-SQL SERVER deal with these kind of issues.?
Q2. If i create 3 more indexes on ClientID, ORderID and OrdersubID. will this improve the performance of query.if person "A" search record on orderNo so what index will be used. (Mind it their would be 3 seprate indexes for Each PK columns) and composite-Clustered index is also available.?
Q3. I want to check what indexes has been used? on what search?
Q4. How can i check what table was populated when, or last date of update (DML)?
My Limitation is i Dont Create a Partioned table. I dont have permission to do it.
In Teradata we had more than 4 tb record of CRM data with no issue. i am not new baby in db line but not expert in sql server 2003.
I am thank u to all who read or reply.
Arshad
Manager Database
Esoulconsultancy.com
(Teradata Master)
10g OCP
SQL 2012 :: Design To Store Different Forms And Form Data?
Oct 17, 2014I am looking to store the different forms and data in our database. We have several different forms and contains different information. I am looking for different approaches to model this table structure.
Also, I need to make sure the table structure will allow for new forms.
Design Index Problem
Oct 22, 2007Hi all,I have a very large table with many columns: dateTime type, nvarchartype and integer field type.A program exec many type of query with where clause.Data field is always in where clause, but some other field is presenttoo. Sometimes integer field, sometimes nvarchar field.Now I must create index for the query!For choose index field what i can do?I must create only index on a datetime field or every combination inevery type of query?In the second case I must create very much index! But this is verydispendious for update/insert/delete operation on the table!!!Some ideas?thnx
View 2 Replies View RelatedIndex Design Question
Apr 4, 2007I want to create an index that will cause the cost of the query to be as low as possible and also
must minimize the space that is used by the index. What type of index/parameters I can associate when I create an Index. I already have a clustered index
Index Design Question
Apr 25, 2008When should a composite index be created in favor of multiple single colum indexes?
thanks
DB Design :: PK And Clustering Index
Jul 6, 2015 I want to have table with 1 PK and 1 Clustered Index on Column2 and Id, this is my code:
CREATE TABLE [dbo].[Test] (
[Id] INT PRIMARY KEY NOT NULL IDENTITY(1,1),
[Column2] INT NOT NULL,
[Column3] INT NOT NULL,
[Column4] INT NOT NULL,
);
CREATE CLUSTERED INDEX IX_Test ON dbo.Test (Column2, Id);
Error: "Cannot create more than one clustered index on table..."I know, that PRIMARY KEY automatically create Clustered index on Id.Then I manually delete existing Clustered index, and run this code part again:CREATE CLUSTERED INDEX IX_Test ON dbo.Test (Column2, Id);Everything is fine, except I lost my PK on Id...How can I leave PK on Id and create my custom Clustering Index?
Column Level Constraints
Jul 17, 2001Hello all.
First of all, I've been a reader of swynk.com for quite sometime now, and I'd like to say 'thank you' to everyone who contributes.
Today, I'm the town moron.. haha I'm having issues with column level constraints. I have a varchar(50) where I want to keep *,=,#,/, .. etc, OUT OF the value input. I don't want to strip them. I simply want for sql to throw an error if the insert contains those (and other characters). The only characters that I want in the column are A-Z and 0-9. However, it's not a set number of characters per insert. It always varies... There has to be an easier way to do this than creating a constraint for every possibilty... Any help would be greatly appreciated.
tia,
Jeremy
How Do I Alter Column With Constraints ?
Nov 22, 2007
I have about 100 databases which yeterday had the wrong ddl for a column added, we have a simple cursor that loops through all databases on the server and runs the sql statement.
The following was run
ALTER TABLE salesrep ADD newCol bit DEFAULT 1
Problem is that it should have been this (and preferably have had a named constraint):
ALTER TABLE salesrep ADD newCol bit NOT NULL DEFAULT 0
Problem is now i dont know the names of the contraints they have random hex on the end "The object 'DF__SALESREP__newCol__5BCD9859' is dependent on column..."
How do i just drop this column with ANY constraints on it?,
I really dont want to go through the databases 1 by 1 and look up the constraint name then drop the constraint, then drop the column so i can add it in correctly.
I wish the following would just work.
ALTER TABLE salesrep ALTER COLUMN newCol bit NOT NULL Default 0
T-SQL (SS2K8) :: Design Table Which Can Store Education Requirement For Job Vacancy
Aug 13, 2014This is my table named - CV
*CVID is a primary key
This is my table named - CVEducation
*CV to CVEducation is 1 to Many. CVEducation(CVID) is a foreign key
This is my table named - Level
*LevelID is stored in CVEducation. So, we can know - This education is Diploma or Degree or Masters or so on
This is my table named - StudyField
*StudyFieldID is stored in CVEducation. Som we can know - What kind of Education they have.
This is the example of Job Vacancy 1
1- Need Diploma in Chemistry OR Degree in Chemistry.
2- CGPA at least - 2.5
*May be need to store 2 rows with each CGPA
This is the example of Job Vacancy 2
1- Need Diploma in Commerce OR Diploma in Economics OR Degree in Biology
2- CGPA at least - 2.8
*May be need to store 3 rows with each CGPA
How to design my table to store Job Vacancy Minimal Requirement? I know, there's some cases we cannot computerized. But, at least some of Job Vacancy Requirement we can computerized.
DB Design :: Can Use Another Server / Disk To Store Files Using FileTable Concept?
May 11, 2015I tried samples of FileTable in SQL Server 2012 to store files in database. I have following questions.
1. When I right click on FileTable, and say Explore File Table Directory, I was taken to a directory. But if I search the same directory in my server/machine, the directory is not available.
2. Can I use some external server/disk as a directory for FileTable?
3. How easy is to use FileTables using .Net web applications?
DB Design :: Nonclustered Index Create
Aug 27, 2015I have table which having clustered index based on column (A,B,C,D,E,F).Now my query based on B,D,F. e.g: where b='Test1' and D='test2' and F='test3' Now Execution plan ask to create non clustered index with (B,D,F) column.is it make any sense to create non clustered index where clustered already available.
View 4 Replies View RelatedDB Design :: Creating Appropriate Index For Table?
May 25, 2015I have a table called as A table :
CREATE TABLE [dbo].[A](
[AutoID] [int] IDENTITY(1,1) NOT NULL,
[ProID] [int] NOT NULL,
[LID] [varchar](12) NOT NULL,
[EventID] [varchar](12) NOT NULL,
[HEventID] [varchar](12) NULL,
) ON [PRIMARY]
How I should creating the appropiate index for this table?A few option that I think ok.
Opt 1 : creating a primary key on the autoID with create index . create non clustered index on ProID and EventID
Opt 2 : create a primary key on the autoID with non clustered index . create clustred index on ProID and EventID .
opt 3: create primary key on the ProID and EventID with clustered index.
I have read thru the article on the primary key, clustered and non clustered indexing. However when I want to applyied the indexing..I feel a bit lost.But among the 3 option.... what is the different..
Store Result[index] From Table In Local Var
Apr 30, 2008Hi,
Can I take the [index] result from a table and store it in a local var?
For example a table
declare @keyWords(
word varchar(40),
wordLen smallint
)
word len
---- ---
test 4
t 1
e 1
declare @index smallInt = 2
SET @keyWord = SELECT TOP @INDEX word FROM @KeyWords
This obviously is not correct for several reasons (TOP returns multiple results, TOP doesn't work with local var etc)
In What Order Does A Clustered Index Store Data?
Mar 26, 2007Hi
I was going through the book by Kalen Delaney where she has mentioned the following paragpraph in Chapter 7 (Index Internals):
Many documents describing SQL Server indexes will tell you that the clustered index physically stores the data in sorted order. This can be misleading if you think of physical storage as the disk itself. If a clustered index had to keep the data on the actual disk in a particular order, it could be prohibitively expensive to make changes. If a page got too full and had to be split in two, all the data on all the succeeding pages would have to be moved down. Sorted order in a clustered index simply means that the data page chain is logically in order.
Then I read the book on SQL Server 2000 (on Perf Tuning) by Ken England. He says the clustered index stores data in physical order and any insert means moving the data physically. Also the same statement is echoed on the net by many articles.
What is the truth? How are really clustered index stored? What does physical order in the above statement really mean?
Regards
SanjaySi
What Is The Constraints Expression For Unique(Column)?
Oct 8, 2007I am in the "Check Constraints" window trying to add a constraint that during inserts only allow distinct Column2 insertions. What is the Expression for that? I tried UNIQUE(Column2) it give me an error.
Here is my table definition:
Column Name Data Type Allow Nulls
--------------------------------------------------------------------------------------------
Column1(PrimaryKey) int No
Column2 nvarchar(MAX) No
DB Design :: Adding Index Taking More Than 24 Hours
Oct 7, 2015Here is the DDL of a table that I am trying to add an identity column and create a clustered index. I am using SQL 2012 SE
CREATE TABLE [dbo].[IPF](
[IPFId] [uniqueidentifier] NOT NULL,
[IPId] [uniqueidentifier] NOT NULL,
[FId] [uniqueidentifier] NULL,
[FName] [nvarchar](50) NULL,
[FItemId] [uniqueidentifier] NULL,
[code]....
The table currently has 220million rows. I am trying to add a new identity new column and create a clustered index on it. I ran the script and its been more than 26hrs and its still running. I ensured there is no blocking.
QUESTION: Status Column Of FK Constraints In Sysobjects - ????
Jul 23, 2005Greetings:I have to do a one-off forceful change of some data in a database. Ineed to disable some FK constraints, make the data change, and thenre-enable the constraints.My process will be:ALTER TABLE TABLE1 NOCHECK CONSTRAINT FK_TABLE1_TABLE2UPDATE TABLE1 SET COLUMN1=2 WHERE COLUMN2='Problem row'ALTER TABLE TABLE1 CHECK CONSTRAINT FK_TABLE1_TABLE2I wanted to get some evidence that the constraints were back up after Idid the 'check constraint' statements, so I looked in sysobjects.There's a status column for the constraints, but I can't make muchsense of the numbers. Most of the FK constraints that I have notchanged are of status 0, but when I NOCHECK a constraint, it goes to2304. When I CHECK it again, it's 2408.Can someone explain this, and suggest a way to double-check that myconstraints are in fact enabled once I run the CHECK statement?Thanks!!
View 2 Replies View RelatedIntegrity Constraint Error On SQL Server Column With No Constraints
Aug 6, 2007I have created a simple package to load an Excel Spreadsheet into a SQL Server table. There is a one to one relationship between the columns in the .xls file and the columns in the DB record. I am getting integrity constraint errors when I try to load all numeric data from the spreadsheet (defined as Category General in excel, not defined as numeric but consisting of all numeric characters) into a column defined as (nvarchar(20), not null) in SQL Server Management Studio. There are no constraints on the column.
I have been able to temporarily bypass the offending rows, but I do need to load them into SQL Server. The problem column has a mixture of data, two examples would be: N255, 168050. It's the 168050 value that's causing the Task to bomb. How can I get this loaded into my table ?
I am running the package from within MS Visual Studio 2005 Version 8, Excel is version 2003 (11.8120.8122) SP2
Thanks,
Chris
UGH! Failed To Enable Constraints. One Or More Rows Contain Values Violating Non-null, Unique, Or Foreign-key Constraints.
Jan 9, 2007I know this is probably a flick of a switch but I cannot figure out which switch. Setup is SQL Server / Stored Procedures / DAL / BLL(skipped for testing) / PL. The stored procedure queries from only one table and two columns are ignored because they are being phased out. I can run the stored procedure and preview the data in the DAL but when I create a page with an ODS linked to the DAL and a GridView I get this error. I checked every column that does not allow nulls and they all have values. I checked unique columns (ID is the only unique and is Identity=Yes in the table definition). I checked foreign-key columns for values that are not in the foreign table and there are none. Any ideas why do I get this?
Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.