Help On Creating A Covering Index????
Apr 2, 2007
Hi,
Trying to optimize a query but not sure what to do. I have this query on which I ran an exec plan,
SET NOCOUNT ON;
SELECT qaTestSuite.TestSuiteID, qaTestSuite.TestSuiteStart, qaTestSuite.TestInterface, qaTestSuite.TestVersion, qaTests.TestMachine, qaTestSuite.TestClientMachine, qaTests.TestLogin, qaTests.TestLabel,
qaTestSuite.TestCLPs, qaTestSuite.TestSuiteEnd, qaTests.TestID, qaTests.TestIDInternal, qaTests.TestStart,
qaTests.TestName, qaTests.TestTier, qaTests.TestNo, qaTests.TestWFBCalled, qaTests.TestWFBTime,
qaTests.TestSearches, qaTests.TestSearchesTime, qaTests.TestResult, qaTests.TestEnd, qaTestMssgs.TestMssgsID,
qaTestMssgs.TestMssgTime, qaTestMssgs.TestMssgType, qaTestMssgs.TestMessage, qaTestSuite.TestMode
FROM qaTestSuite with(NOLOCK) INNER JOIN
qaTests with(NOLOCK) ON qaTestSuite.TestSuiteID = qaTests.TestSuiteID INNER JOIN
qaTestMssgs with(NOLOCK) ON qaTests.TestID = qaTestMssgs.TestID
order by qaTestSuite.TestSuiteStart DESC
and it gives me the following results:
Use a Bookmark (RID or Clustering Key) to look up the corresponding row in the Table or Clustered Index.
Physical Op: Bookmark Lookup
Logical Op: Bookmark Lookup
Est. Row Count: 128
Est. Row Size: 4760
Est. I/O Cost: 0.368
Est. CPU Cost: 0.000141
Est. Execs: 1.0
Est. Cost: 0.368888(89%)
Est. Subtree Cost:.415
Argument:
BOOKMARK:([Bmk1004]), OBJECT:([QAMaster].[dbo].[qaTestMssgs]) WITH PREFETCH
I have no idea what to do with that. Anyone have any clues? What I found online was that I should make a Covering Index, but I didn't find
any patterns on how to do that. Any one have ideas of how to do this?
Thanks very much for your help!
--PhB
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May 15, 2008
I have a table there is a query which has bad performance. This query normally can not use index because a lot of 'IS NULL','OR','LIKE' USED in where clause. I want to create a covering index for this query so it can use index scan only rather than Processor had to look up the row columns it needs
from a table or a clustered index.
current there are two index apply on that table:
CREATE UNIQUE CLUSTERED INDEX [Person_RecordID_UIX] ON Person
(
[RecordID] ASC
)
go
ALTER TABLE [Person] ADD CONSTRAINT Person_PK PRIMARY KEY NONCLUSTERED
(
[EntityID] ASC
)
How to add a covering index for the columns such as familyName,givenName, dob. All of these columns are not too much high selective.
Can I do like the following :
--create third index
CREATE NONCLUSTERED INDEX [Person_Cover_IX] ON [dbo].[Person]
(
[EntityID] ASC
)
INCLUDE ( [FamName],
[FirstName],
[DOB],
[Gender]
)
Or DROP Current index on entityid and recreate it with include clause.
What's the different between these two.
Thank you.
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Dec 5, 2007
Hello,
i have a database with about 300.000 entries. The database gets about 30 new entries every day. The Database has an FulltextIndex on several columns. This FulltextIndex will be updated every night.
But now i have found out, that the fulltextsearch doesn't work anymore for all entries that where added after April 2006.
When i for example make following sql-statementSELECT id,date FROM MyTable WHERE (CONTAINS((columnA),' "mykeyword" '))
i only get results that have a date after April 2006 (although there are matching entries after that date).
What can the reason for that be?
According to Management Studio the last Update of the FulltextCatalog has been made on 1st of December 2007. Everything looks normal and I didn't find any logs that are saying that there has been any errors.
Where do I have to look to be sure if the FullTextIndex does work?
Specs:
SQL Server 2005
Microsoft SQL Server Management Studio 9.00.1399.00Microsoft Analysis Services-Clienttools 2005.090.1399.00Microsoft Data Access Components (MDAC) 2000.086.3959.00 (srv03_sp2_rtm.070216-1710)Microsoft MSXML 2.6 3.0 6.0 Microsoft Internet Explorer 6.0.3790.3959Microsoft .NET Framework 2.0.50727.832Operating System 5.2.3790
greetings
Klaus
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Jan 2, 2015
I have created a covering Index like below,
----------------------------------------------------------------
CREATE NONCLUSTERED INDEX [INX_NONCLUS_COVERING_INVBAK] ON [dbo].[Invoices_Bak]
(
[SellerID] ASC, -- Key column
[BuyerID] ASC -- Key column
)
INCLUDE (
[ReceivedDate], --Non key column
[Code] ....
Above index has created on production environment, Now i would like alter above index that is from non key column to key column
You can find a non key column called [ReceivedDate] that is available in include part, i need to make this column to Key column.
How to do this proper way without affect production environment that is using unwanted disk size and more..
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Aug 9, 2006
Hi,
When I create a unique constraint, SQL Server automatically creates an index on this constraint. So when I run the following...
ALTER TABLE PersonsProjects
WITH NOCHECK ADD CONSTRAINT NoDupes UNIQUE NONCLUSTERED (PersonID, ProjectID)
...SQL Server will create a composite index on PersonsProjects called NoDupes on PersonIDand ProjectID. Thing is, I need this index to include a third column Status since most queries use this column in conjunction with PersonID and ProjectID. If there was no index on this table, I would have created it as follows:
CREATE UNIQUE INDEX NoDupes ON PersonsProjects (PersonID, ProjectID) INCLUDE (Status) WITH IGNORE_DUP_KEY
But this won't enforce the unique constraint on PersonID and ProjectID when performing inserts and updates. Is there any way of creating a unique constraint with an included column?
I would rather not have two indexes...
NoDupes: PersonID,ProjectID
New Index: PersonID,ProjectID INCLUDE Status
...so I'm trying to determine what other options that might be available...please advise.
Thanks much.
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Aug 1, 2006
Hi,
I asked the similar question before but I have again some doubts about covering indexes.
Besides, tomorrow I have a Microsoft MCAD 70-229 exam so please help me.
In here,
SELECT * FROM Order WHERE OrderID > 12 ORDER BY OrderDate
we create composite nonclustered index for both OrderID and OrderDate column.
Leftmost is OrderID.
So
when our first research is happening(Where clause), the only
nonclustered index which is used is OrderID index. And then, when we
pass through the second search(ORDER BY clause), OrderDate index become activated.
So
we can say that the seleection of indexes in composite indexes is
determined according to the situation of the query at that time.
Hence, is this all correct ?
Best wishes,
Mert
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Mar 12, 2008
I plan to use covering indexes as my core tables are really huge. I wanted to check if the new feature "Included Columns" for an index is beneficial in the following scenario:
If I have a non-clustered index within the limitations of 16 fields and under 900 bytes as opposed to having 1 field with 15 included fields for the same - what is the difference in performance? Is there any advantage in using the included columns?
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Oct 31, 2007
I am creating an index on a table wit 35 million records but I get the error
'TT_ObjPerformance' table- Unable to create index 'IX_TT_ObjPerformance_CACode'. Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
How can I get the index created?
ThanksSQL Server newbie
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Jan 22, 2008
Hi
i am new to using this sql server 2000....this is a very simple question to all u guys.....i am just in a learning stage...so any help from u guys is really appreciable....
i need to create a table customers with the following columns...
identity column to self-populate as the primary key,
joindate, leavedate, custcode, empID.
This is the one i tried:
create table customers (id int primary key identity (1,1) not null,
joindate smalldatetime null,
leavedate smalldatetime null,
custcode varchar (10) not null,
empid int not null
)
is tht code correct only???
and i also want the below one :
Create indexes on the leavedate, custcode and empid columns.
how to create these indexes???
and wht happens when i create them(like is thr any advantage of creating indexes???)
thanks......
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Jul 20, 2005
HiI tried the following from the help file...When you create or modify a unique index, you can set an option toignore duplicate keys. If this option is set and you attempt to createduplicate keys by adding or updating data that affects multiple rows(with the INSERT or UPDATE statement), the row that causes theduplicates is not added or, in the case of an update, discarded.For example, if you try to update "Smith" to "Jones" in a table where"Jones" already exists, you end up with one "Jones" and no "Smith" inthe resulting table. The original "Smith" row is lost because anUPDATE statement is actually a DELETE followed by an INSERT. "Smith"was deleted and the attempt to insert an additional "Jones" failed.The whole transaction cannot be rolled back because the purpose ofthis option is to allow a transaction in spite of the presence ofduplicates.But when I did it the original "Smith" row was not lost.I am doing something wrong or is the help file incorrect.Dan
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May 30, 2000
I created table and also I define the primary key its okay
but when I generate the SQL script for that table its not
creating the primary key
CREATE TABLE [dbo].[table1] (
[emp_id] [int] NOT NULL ,
[emp_name] [char] (25) NULL ,
[emp_address] [nvarchar] (50) NULL
) ON [PRIMARY]
GO
PS: I want to use emp_id as primary key but its not defined in the sql script
Thankx a lot
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Apr 15, 2003
Does anyone have a general rule or guide on when to use this SQL 2000 option when creating indexes? I was thinking generally on nonclustered indexes where the column would be unique and incremental and usually filtered on by range and often used in the order by clause. Such as columns of datetime or integers datatypes. Thanks.
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Dec 20, 2006
have a 3rd party app (can't change) which has some bad sql. I have a table that is used in the sql which if I put a clustered (I had an index on the fields in the sql but it would ignore and table scan) will use and stop doing table scan. this is a million row table that is growing. the data going in is pretty mich insert only. I have a separate array and file group which I have moved indexes to last year. 2 questions
1. If I would make a clustered index on the separate RAID and file group, doesn't the table need to go with it. I thought the clustered index and table had to be on same File Group
2. If I do this anyone see any issues with moving this table and index on this file group
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Sep 29, 2005
Hi Guys,
I have a SQL 2000 sp3a server on Windows 2000 sp4. Running dual proc server with hyper threading enabled, 3gb memory attached to a HP EVA 5000 SAN.
One of the tables is 67gb and contains 140,000,000 rows. Recently someone dropped the clustered indexe so i`m trying to put it back (i've dropped the non clustered indexes as no point leaving them there whilst clustered builds).
The problem i am having is the rebuild is taking forever!! It ran for 23 hours before someone rebooted the server (!). The database is currently recovering from the reboot but i need to work out what is causing the appalling performance so i can get the index rebuilt. There are no reported hardware problems.....
There are multiple file groups involved and i found i was getting an extent allocation rate of 1.5 extents a second and same for deallocation.
Any advice on how to trouble shoot this?
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Jul 18, 2007
Hi,
I have created a very simple table. Here is the script:
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[IndexTable]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[IndexTable]
GO
CREATE TABLE [dbo].[IndexTable] (
[Id] [int] NOT NULL ,
[Code] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL
) ON [PRIMARY]
GO
CREATE CLUSTERED INDEX [CusteredOnCode] ON [dbo].[IndexTable]([Id]) ON [PRIMARY]
GO
ALTER TABLE [dbo].[IndexTable] ADD
CONSTRAINT [PrimaryKeyOnId] PRIMARY KEY NONCLUSTERED
(
[Id]
) ON [PRIMARY]
GO
The records that i added are:
Id Code
1 a
2 b
3 aa
4 bb
Now when i query like
Select * from IndexTable
I expect the results as:
Id Code
1 a
3 aa
2 b
4 bb
as i have the clustered index on column Code.
But i m getting the results as:
Id Code
1 a
2 b
3 aa
4 bb
as per the primary key order that is a non clustered index.
Can anyone explain why it is happening?
Thanks
Nitin
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May 25, 2015
I 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..
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Oct 26, 2000
Hi, Folks!
I'm receiving Access Violation Error when I'm trying to create a clustered index on a datetime field on a table that have around 4 million records, if I create the index nonclustered, no problem, but clustered the system raise this error!
Any help will be appreciate a lot!
Thanks in advance!
Armando Marrero
Cti. Miami
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Nov 12, 2014
In a Stored Proc I am creating the following temp table and index:
CREATE TABLE [dbo].[#ShipTo](
[Ship_to_Num] [int] NOT NULL,
[Country_key] [nvarchar](3) NULL,
CONSTRAINT [PK_ShipTo] PRIMARY KEY CLUSTERED
(
[ship_to_Num] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
The stored Proc runs fine from "exec", but when you batch into a Job it gives the error that "PK_ShipTo" already exists! I even put in a drop table on #ShipTo, but the same effect.
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Dec 24, 2014
I have 5 million rows of table, and going to create Non Clustered Index for Datetime values column. Creating Non clustered Index on Datetime value column will affect performance or not.
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Nov 28, 2007
Anyone know the syntax and function to create a self incrementing index whilst extracting data? I'm using the Derived Column tool. The extract will be a full extract everytime, not incremental.
Thanks.
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May 17, 2008
Hi all,
Im new to sql and very interreseted in the Full text features, however when im trying to execute the following query:
USE Updater
CREATE FULLTEXT INDEX ON dbo.Servers (ServerName)
KEY INDEX ServerID
ON UpdaterCatalog
WITH CHANGE_TRACKING AUTO
GO
Where ServerID = Int NOT NULL IDENTITY and ServerName = VarChar(255) NOT NULL and UpdaterCatalog is just created
I get the following error:
Msg 7653, Level 16, State 1, Line 3
'ServerID' is not a valid index to enforce a full-text search key. A full-text search key must be a unique, non-nullable, single-column index which is not offline, is not defined on a non-deterministic or imprecise nonpersisted computed column, and has maximum size of 900 bytes. Choose another index for the full-text key.
I cant seem to figure out why this wont work since unless im mistaking, both fields are legal.
Note that creating an index on any other table doesn't work either.
Im running Sql server standard edition (32 bits) on VISTA Ultimate X64
Thanks in advance,
Koen
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Sep 27, 2007
Hi,
i have created index for a temporary table and this script should used by multiusers.So when second user connecting to it is giving index i mean object already exists.
So what i need is when the second user connected the script should create one more index on temporary table.Will sql server provide any random way of creating indexes if the index exists already with that name??
Thank You,
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Jul 9, 2015
Does including non-key columns work for the performance of an index?
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Jul 28, 2015
I used following query to identify missing indexes:
SELECT mid.statement , mid.included_columns, mid.equality_columns, mid.inequality_columns,
migs.avg_total_user_cost * (migs.avg_user_impact / 100.0) * (migs.user_seeks + migs.user_scans) AS improvement_measure,
'CREATE INDEX [NCIX_' + CONVERT (varchar, mig.index_group_handle) + '_' + CONVERT (varchar, mid.index_handle)
+ '_' + LEFT (PARSENAME(mid.statement, 1), 32) + ']'
+ ' ON ' + mid.statement
[Code] ....
I think I need to only create few if an index is covering all columns then I do not need to create more indexes for separate columns or should I create separate index as suggested?
Similarly:
CREATE INDEX [NCIX_20187_20186_TL_SRV_Stationary_Stock_Transact] ON [TL_SRV_Stationary_Stock_Transaction] ([SerialNo],[StationaryStatus]) GO
CREATE INDEX [NCIX_20189_20188_TL_SRV_Stationary_Stock_Transact] ON [TL_SRV_Stationary_Stock_Transaction] ([StationaryStatus]) INCLUDE ([SerialNo]) GO
[Code] ....
Should I create all indexes above or use minimum number of indexes which covers all columns as mentioned in above create index statements?
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Apr 2, 2007
Hi,
I've created initial indexes for my table for the fuzzylookup process. I clicked on "Maintained index" but I don't see any triggers created on the reference table.
Do I create the triggers to maintain indexes myself?
Does anybody know how to create these triggers in terms of schema_name, Data_Modification_Statements etc.?
Would it be "Alter index <index name> REBUILD command?
Appreciate the help.
Gulden
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Jan 16, 2008
I am working with a dynamically populated multi value parameter drop down list. In the case where there is only one value in the list, the horizontal scroll bar (due to the length of the value) covers up the first, and in this case only choice. The users cannot see it. This problem is only when running in report manager. It works ok in Visual Studio.
As a work around, I can add a dummy row, which then at least the users can see one row of data and then scroll down but, I would rather not do that, if there is another solution. Another option would be to set the default on the parameter so it is automatically selected but, in the case where there are many values, I do not want a default set.
Your help would be greatly appreciated.
Thanks!
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Sep 30, 2015
Table Name: Denominator
Already has the following constraint:
PK_Denominatorclustered, unique, primary key located on PRIMARY DenominatorID
How can I add a unique key that will cover the 3 fields --> MemberID,MeasureID,TimePeriodID
I also want to know whether we can include the " WITH ( IGNORE_DUP_KEY=ON ) "
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Sep 26, 2015
I 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
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Mar 13, 2008
I know how to create it from the query window:
CREATE FULLTEXT INDEX ON table_name
[(column_name [TYPE COLUMN type_column_name]
[LANGUAGE language_term] [,...n])]
KEY INDEX index_name
[ON fulltext_catalog_name]
[WITH
{CHANGE_TRACKING {MANUAL | AUTO | OFF [, NO POPULATION]}}
]
But where and how can I create it graphically in management Studio for 2005?
Thanks for any help or information.
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Apr 28, 2008
Hello!
I have a problem. I want to know if the time which is needed for creating an index increases proportional to the amount of rows. example: if creating an index on a table which 10.000 rows takes 15 seconds. does creating an index on a table with 20.000 rows take 30 seconds , 40.000 rows 60 seconds and so on...
or does it take longer like 10.000 rows 15 second, 20.000 rows 40 seconds, 40.000 rows 80 seconds.
thx for your help!!
Filipe
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Apr 12, 2007
I hope i'm in the right place, but thanks anyway....
Actually i have 2 questions (regarding sql-server Indices/Keys):
1) I have an index, which is consisted of 4 columns.
I've read elsewhere that this index functions (as well) as an index (single column
index) on the first column of this multi-column index.
Does this mean that if i'd like to have (in addition) Indices on all of the 4 columns
seperately i need to define only 3???
2) I have a unique key consisted of multiple columns.
I'd like to save an index to this combination of columns as well (to speed up
things in DB...).
Does the definition of a multiple-columns key free me from defining the multiple-
columns index???
can anyone explain the main diference between Keys and Indices???
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Apr 16, 2007
I hope i'm in the right place, but thanks anyway....
Actually i have 2 questions (regarding sql-server Indices/Keys):
1) I have an index, which is consisted of 4 columns.
I've read elsewhere that this index functions (as well) as an index (single column
index) on the first column of this multi-column index.
Does this mean that if i'd like to have (in addition) Indices on all of the 4 columns
seperately i need to define only 3???
2) I have a unique key consisted of multiple columns.
I'd like to save an index to this combination of columns as well (to speed up
things in DB...).
Does the definition of a multiple-columns key free me from defining the multiple-
columns index???
can anyone explain the main diference between Keys and Indices???
thanks,
Ran Kizi
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