I 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 RepliesHi guys. I have a table named [Check] and need to create an index for CVNumber field. The table has no primary key for the meantime. I tried this script but error occured.
BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
GO
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
GO
COMMIT
BEGIN TRANSACTION
CREATE NONCLUSTERED INDEX IX_Check_1 ON dbo.[Check]
(
CVNumber
) ON [PRIMARY]
GO
COMMIT
Error message:
Server: Msg 3023, Level 16, State 2, Line 3
Backup, CHECKALLOC, bulk copy, SELECT INTO, and file manipulation (such as CREATE FILE) operations on a database must be serialized. Reissue the statement after the current backup, CHECKALLOC, or file manipulation operation is completed.
Server: Msg 3902, Level 16, State 1, Line 1
The COMMIT TRANSACTION request has no corresponding BEGIN TRANSACTION.
Is it because I used the table name Check which is a reserved word for SQL? But I included [ ].
Please help. Thank you.
Hi everyone,
When we create a clustered index firstly, and then is it advantageous to create another index which is nonclustered ??
In my opinion, yes it is. Because, since we use clustered index first, our rows are sorted and so while using nonclustered index on this data file, finding adress of the record on this sorted data is really easier than finding adress of the record on unsorted data, is not it ??
Thanks
hello!
Is it possible to set nonclustered
index on column with dublicate values?
Thank you,
Alona
Hello I want to learn disparity clustered index or nonclustered index and in queries which one run better.
example
select * from orders where orderID=5
to this query clustered or nonclustered
thanks
I have 3 table A, B, C
Table A (15 field, 4 fields indexed and Primary Key) – approximate rows: 50.000 – 60.000
Table B (18 field, 6 fields indexed and Primary Key) – approximate rows: 350.000 – 500.000
Table C (16 filed, 9 fields indexed and Primary Key) – approximate rows: 500.000 – 1.000.000
Structure is something like this:
A (master) --> B (detail) ---> C (sub detail)
On each 3 table is added new record, in table C the record is added after a search in table B.
My question is: Which is the best method? CLUSTERED INDEX or NONCLUSTERED INDEX
Thanks
Sorry for my english
when do you use them?
i only know you use clustered when you have million of records. So once the table has been indexed, query statement is able to retrieve the recordset faster.
what about nonclustered?
Hi everyone,
I have some problems on composite nonclustered indexes. I could not exatly understand their logic.
In my opininon, suppose that we have a table called Order and we create a composite nonclustered index on this table for OrderID column and OrderDate column. So I am using this query;
SELECT * FROM Order WHERE OrderID > 12 ORDER BY OrderDate
So in here, I think our first research is based on OrderID and ten after ordering our data pointer according to the OrderID and then our index is converted to an index which is based on OrderDate while performing ordering. So is this correct ??
Would you please explain this ?
Thanks
When a nonunique nonclustered index is built on top of a clusteredindex, is it guaranteed that the bookmark in the nonclustered indexwill be kept in the same order as the clustered index?Here's an example to demonstrate my question:CREATE TABLE indextest (col1 int NOT NULL,col2 int NOT NULL,col3int,col4 int)ALTER TABLE indextest ADD PRIMARY KEY CLUSTERED (col1,col2)CREATE INDEX ix_indextest ON indextest (col1,col3)GOINSERT indextest VALUES (1,2,1,1)INSERT indextest VALUES (1,3,2,1)INSERT indextest VALUES (1,4,2,1)INSERT indextest VALUES (2,1,1,1)INSERT indextest VALUES (1,1,1,1)SELECT col1,col2 FROM indextest WHERE col1=1 AND col3=1DROP TABLE indextestThe select statement above is covered by the nonclustered index, sothat index is used. However, the nonclustered index is defined only toensure the ordering of col1 and col3 within the index; col1 and col2follow within the index as the bookmark to the clustered index. When Irun this query, my desired result is to have the records appear in theorder supported by the clustered index:1,11,2As it happens, the result I got was indeed in that order, but I don'tknow if it was mere coincidence, or if the bookmark in the nonclusteredindex is maintained in the same order as the clustered index. If Iwant to ensure the above order, is it sufficient to have thenonclustered index defined as above, or do I need to define it as:create index ix_indextest on indextest (col1,col3,col2)just to be sure that the results are returned in ascending order forcol1,col2? If the two-column index is sufficient, is it guaranteed tostill be sufficient in SQL2005 and future versions of SQL Server, or amI better off adding the third column just to be safe?Thank you,--Dennis Culley
View 4 Replies View Related
I am attempting to understand the behaviour of a nonclustered index in regards to page splitting.
If I had the following table:-
Col1, Col2, Value
This table has a Clustered index on Col1, Col2 and a NonClustered index on Col2 and include Col1, Values.
If inserts into Col1 were causing page splits in the Clustered index, what are the effects on the NonClustered index?
I am attempting to understand what happens to the NonClustered index in this scenario so that I can make a decision on what fillfactor to use.
We have a vendor created database with 9000+ tables, one of which has about 6 billion rows. Â 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?
I desire to have a clustered index on a column other than the Primary Key. I have a few junction tables that I may want to alter, create table, or ...
I have practiced with an example table that is not really a junction table. It is just a table I decided to use for practice. When I execute the script, it seems to do everything I expect. For instance, there are not any constraints but there are indexes. The PK is the correct column.
CREATE TABLE [dbo].[tblNotificationMgr](
[NotificationMgrKey] [int] IDENTITY(1,1) NOT NULL,
[ContactKey] [int] NOT NULL,
[EventTypeEnum] [tinyint] NOT NULL,
[code]....
For a table 'table1' in sqlserver 2000,
table1(col1) is clustred index 'Ix1' and table1(col1,col2,col3) is nonclustered index 'ix2'
is not tabel1(col1) 'ix1' a duplicate/redundant index ?
which index should be retained ?
or should both indexes remain on the OLTP table ?
Thanks a lot in advance.
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
Can I dynamically (from a stored procedure) generatea create table script of all tables in a given database (with defaults etc)a create view script of all viewsa create function script of all functionsa create index script of all indexes.(The result will be 4 scripts)Arno de Jong,The Netherlands.
View 1 Replies View RelatedHi 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 RelatedI 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
When should a composite index be created in favor of multiple single colum indexes?
thanks
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?
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,Â
) ON [PRIMARY]Â Â Â
How I should creating the appropiate index for this table?AÂ 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..
Here 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.
can 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?
View 3 Replies View RelatedI 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 RelatedI created composite clustered index key based on Gender and Salary columnÂ
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>Â (20)Â
Hi Minor and inconsequential but sometimes you just gotta know: Is it possible to define a non-primary key index within a Create Table statement? I can create a constraint and a PK. I can create the table and then add the index. I just wondered if you can do it in one statement. e.g. I have: CREATE TABLE MyT (MyT_ID INT Identity(1, 1) CONSTRAINT MyT_PK PRIMARY KEY Clustered, MyT_Desc Char(40) NOT NULL CONSTRAINT MyT_idx1 UNIQUE NONCLUSTERED ON [DEFAULT])which creates a table with a PK and unique constraint. I would like (pseudo SQL):CREATE TABLE MyT (MyT_ID INT Identity(1, 1) CONSTRAINT MyT_PK PRIMARY KEY Clustered, MyT_Desc Char(40) NOT NULL CONSTRAINT MyT_idx1 UNIQUE INDEX NONCLUSTERED ON [DEFAULT]) No big deal - just curious :D Once I know I can stop scouring BOL for clues. Tks in advance
View 2 Replies View RelatedI'm working on re-indexing a table using some commands from ALTER INDEX REBUILD from Microsoft. The indexes will be tested for threshold fragmentation. my plan is once the reindex is executed, a transaction backup will occur while controlling the size of the log file. Â The query impose time limitations or stop reindexing after the specified amount of time has elapsed.
my question,
1. How can I integrate a query which checks if transaction log is getting full and which runs a Tlog backup if over 70%
2. How do I impose time limitation?
Ok, let me try to set the stage.
Between 2m and 5m inserts per day. NO UPDATES.
Table has a 4 part primary key. All BigInt data types. Key value 1 and 2 have a range between 1 and 100. Key values 3 and 4 are auto incrementing values (forign key values) from other tables.
Space is an issue, so we have chosen not to have an additional column for a counter field for the PK. (We would never use the field for querying.)
Users complained of query speeds, so we added a couple non clustered indexs. This brought up the query speeds a lot. But of course it slowed down the input speed a bit. Nothing dramatic, but enough so we could tell.
Now the users was to increase the amount of data by about 5X. Obviosly I'm somewhat concerend, as SQL is already spending a lot of the day pegged.
So, in looking around, since the new indexes seem to be the most help in querying, I'm thinking of dropping the PK back to a nonclustered index, so I can get rid of the over head of restructring the data table on every insert. Then maybe making one of the other indexes the clustered index. (only 2 columns in this index)
Thoughts?
I need to check if an index available on table T1 and field F1. If not, create a non-clustered on F1. How can I do this in a stored procedure?
View 1 Replies View RelatedSET QUOTED_IDENTIFIER ON
GO
SET ANSI_NULLS ON
GO
/****** Object: Stored Procedure dbo.carr_summary_Datewise Script Date: 5/15/2008 10:20:37 AM ******/
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[carr_summary_Datewise]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[carr_summary_Datewise]
GO
CREATE proc carr_summary_Datewise --2007,9,27,30,'COMPUTERTEL'
@pYear int,
@pMonth int,
@pDay1 int,
@pDay2 int,
@pOperator varchar(32) -- DisplayName
as
begin
declare @sql varchar(4000)
declare @Service varchar(32)
declare @Operator varchar(32)
declare @tDiff int
declare @pDate1 varchar(32)
declare @pDate2 varchar(32)
declare @pD1 datetime
declare @pD2 datetime
declare @sD varchar(2)
declare @eD varchar(2)
declare @eM varchar(2)
declare @tb1 varchar (32)
set @pDate1 = dbo.AsString(@pYear,@pMonth,@pDay1,0,0,0)
set @pDate2= dbo.AsString(@pYear,@pMonth,@pDay2,23,59,59)
--print @pDate1
--print @pDate2
select @Operator=SystemName,@tDiff=timeDiff from Report..Carriers where DisplayName=@pOperator
select @Service=serviceName from Report..Carriers where SystemName=@Operator
--print @tDiff
set @pD1=dateadd(hh,@tDiff,(cast(@pDate1 as datetime)))
set @pD2=dateadd(hh,@tDiff,(cast(@pDate2 as datetime)))
--print @pD1
--print @pD2
/*set @sD=datepart(dd,@pD1)
set @eD=datepart(dd,@pD2)
set @eM=datepart(mm,@pD1)*/
--print @eM
if @pDay1=1
begin
set @sD=1
end
else
begin
set @sD=datepart(dd,@pD1)
end
if @pDay2=30
begin
set @eD=30
end
else
begin
set @eD=datepart(dd,@pD2)
end
if @pDay2=31
begin
set @eD=31
end
--else
-- begin
-- set @eD=datepart(dd,@pD2)
-- end
--print @sD
--print @eD
--print 'Operator=' + @pOperator
--print 'Service=' + @Service
--set @tb1='ob_sep07'
if @pMonth=1
begin
set @tb1='ob_Jan08'
end
if @pMonth=2
begin
set @tb1='ob_Feb08'
end
if @pMonth=3
begin
set @tb1='ob_Mar08'
end
if @pMonth=4
begin
set @tb1='ob_Apr08'
end
if @pMonth=5
begin
set @tb1='ob_May08'
end
if @pMonth=6
begin
set @tb1='ob_Jun08'
end
if @pMonth=7
begin
set @tb1='ob_Jul08'
end
if @pMonth=8
begin
set @tb1='ob_Aug08'
end
if @pMonth=9
begin
set @tb1='ob_Sep08'
end
if @pMonth=10
begin
set @tb1='ob_Oct08'
end
if @pMonth=11
begin
set @tb1='ob_Nov08'
end
if @pMonth=12
begin
set @tb1='ob_Dec08'
end
set @sql='
select Callyy,Callmm,Calldd,CallDate,dbo.Acc_NearestZone_Tracks(Operatorout,routepfx,CallDate) zone,
routepfx,Talktime,RefUploader.dbo.WhichTimeClass(''' + @pOperator + ''',CallDate) TimeCls,Cost
from
(
select Callyy,Callmm,Calldd,dbo.asString(Callyy,Callmm,Calldd,Callhh,0,0) CallDate,Routepfx,Operatorout,
cast(sum(Talktime/60.) as decimal(10,2)) Talktime,Cost
from Report.dbo.'+@tb1+' (nolock)
where Operatorout=''' + @Operator + '''
and Callyy=' + ltrim(str(@pYear)) + '
and Callmm=' + ltrim(str(@pMonth)) + '
and calldd between ' + ltrim(str(@sD)) + ' and ' + ltrim(str(@eD)) + '
group by Callyy,Callmm,Calldd,dbo.asString(Callyy,Callmm,Calldd,Callhh,0,0),
Routepfx,Operatorout,Cost
)x
where CallDate between ''' + convert(varchar(20),@pD1,120) + ''' and ''' + convert(varchar(20),@pD2,120) + '''
'
--print(@sql)
--exec (@sql)
set @sql=
'select Callyy,Callmm,Calldd,Routepfx Prefix,case when zone is not null then zone else ''--NOT FOUND--'' end zone,
case when TimeCls is not null then TimeCls else ''--NOT FOUND--'' end TimeCls,
''' + @Operator+ ''' Operatorout,Sum(Talktime) Talktime,Cost
from ('+@sql+') x
group by Callyy,Callmm,Calldd,Routepfx,zone,TimeCls,Cost
order by Callyy,Callmm,Calldd,Routepfx,zone,TimeCls
'
--print (@sql)
exec (@sql)
end
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
this procedure takes more time to run
we need make it fastly
what should i need
if i create one index how it works
where should i create index please write one index for me
Hi all
Recently we are having issues with one of the indexes during our maintenance. There is one index that which usually would have taken 10-15 mins continues to run even after 3 hrs. Other indexes on the same table finish nicely. Just this one gets stuck. Our index creation scripts drops existing index and creates new one..
CREATE INDEX ... ON ... WITH DROP_EXISTING, SORT_IN_TEMPDB ...etc
So last week when I got woken up because of this, I tried to drop the index explicitly and re create the index (by removing the DROP_EXISTING in above script). Even though it took about 45 mins it still finished in time during the maintenance window.
We had the same issue this week. I was looking at sp_who2 during the index creation, I noticed very low CPU activity and high DiskIO.
example: CPU : 4k cycles, DiskIO 50000.
There is 20% of free space on the index file group. Generally index creation takes higher CPU and lower DiskIO.
How do I find out what the issue is with this index? The table has 40 million rows. this is a non-clustered index. There are 2 other indexes on the table - one clustered. they both finished properly in less than 10 mins.
Thanks in advance,
Don
I need to check if an index available on table T1 and field F1. If not, create a non-clustered on F1. How can I do this in a stored procedure?
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