Two Non-cluster Indexes On Same Column?
Feb 5, 2014We have two non cluster indexes on the same column for a table. let me know will it impact negatively on table like performance etc. ?
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Beginner's Question On Cluster Indexes
Jan 24, 2007Hi,
Imagine a group of tables headed by Columns: "Day","Customer",and "Town". With One C.Index already built based on "Day" and "Customer". Most queries have only these 2 Columns in their WHERE Clauses.
Now if a new group of Queries are to be run where the WHERE Clause will take "Day" and "Town" but not "Customer".
Question:
Is it better to a) add a New - 2nd C.Index to each table based on "Day" and "Town" or b) to remove it and Create a New (Only one) Cluster Index based on 3 Columns: "Day","Customer","Town" ?
Appreciate any advice,
Gezza
Multi-column Index Vs Single Column Indexes
Aug 14, 2007Hi,Would like to know the performance differenece between Multi-columnIndex vs Single Column Indexes. Let's say I have a table with col1,col2, col3 along with a primary key column and non-indexed columns.In queries, I will use col1, col2, and col3 together and some timesjust one or two of these three columns. My questions is, should Icreate one index contains col1, col2, and col3, or create 3 seperatedcolumns. I.e. each column has its own index. Any performancedifference?Thanks a lot.
View 1 Replies View RelatedIdentity Column And Indexes
Sep 21, 1999The largest table in the database is not referenced by any other table. Primary key is identity column. I know that I shouldn’t make clustered index on that column, but what if I don’t index that column at all? Will it be some negative consequences of that decision?
View 2 Replies View RelatedUsing SELECT ... WHERE Column IN (..., ...) Use The Indexes !?!?
Jan 25, 2008Anyone can explain to me if the expression
SELECT ... WHERE Column IN (..., ...)
use the indexes or it's better to use the
SELECT ... WHERE Column = ... OR Column = ...
what is the best for the engine!?
Regards
Paulo Aboim Pinto
Odivelas - Portugal
Multiple Indexes On The Same Column
Jan 21, 2008Hi All
I have a table with indexes as follows
license_detail_prim
clustered, unique located on PRIMARY
component_id, license_id
LICENSE_DTL_IDX_LICENSE_ID
nonclustered located on PRIMARY
license_id
PK__license_dtl__6EB64F9B
nonclustered, unique, primary key located on PRIMARY
component_id, license_id
XIF39license_dtl
nonclustered located on PRIMARY
license_id
from the above, it is evident that multiple indexes have been created on the same columns
What is the side effects of havins such table design.
Thanks
Comparing Column Names And Indexes
Feb 17, 2004Is there a way to compare tables in 2 different databases to find out if they have the same indexes and column names and keys. Or maybe a tool i dont know about.
View 1 Replies View RelatedDo You Include Clustered Index Column In Other Indexes?
Apr 3, 2002I have a database where records are Inserted by an external process.
There is no updating or deleting of the data once inserted. The table in
question has a Clustered Index on the Machine_ID (integer) (data is from
manufacturing processes). Each record bears a start and end time. Most
queries involve the Machine, a time span (start time between to points in
time), the Downtime Cause, and the Running Mode.
I want to add an index on the Start Time, the Downtime Cause, and the
Runtime Mode.
My question is: should this new index also contain the Machine_id column
or does the existence of the Clustered Index already on that column negate
its need in the new index?
RC - Dedicated to only creating original mistakes!
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 RelatedTransact SQL :: Find Column ADRSCODE Used In Indexes Or Primary Keys?
Oct 12, 2015I wanted to find all occurrences of ADRSCODE in a Database where ADRSCODE is in either an Index or a Primary Key.
I know how to get all of the occurences of ADRSCODE in a database and the table associated with it, I just want to tack on the Index and/or primary key.
SELECTOBJECT_NAME(object_id)FROMsys.columns
WHEREname
='foo'
How can I get the other bit of information ?
SQL Server Admin 2014 :: Column Store Indexes Ignored When Run Test Queries
Aug 25, 2015I had an existing table with lots of indexes.
As a test (fro speed) - I added a non clustered column-store index.
When I run test queries it always ignores my new column-store index. Why?
Should I remove the old indexes, leaving just the column store?
Multiple Columns Index/Key (does It Free Me From Creating A Single Column Indexes???)
Apr 12, 2007I 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???
Transact SQL :: Fragmentation Levels Of All The Clustered Column-store Indexes In A Database?
Sep 18, 2015I have a database in which I have some tables in which I have implemented Clustered columnstore Index. How to find the fragmentation levels of all these indexes via a single T-SQl script
View 3 Replies View RelatedMultiple Columns Index/Key (does It Free Me From Creating A Single Column Indexes???)
Apr 16, 2007I 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
SQL Server 2008 :: Usage Of Built-in Functions On Columns Ignores / Excludes Indexes On That Column?
May 25, 2015Somewhere i read..that in SQL Server...usage of Built-in Functions on Columns, makes query optimizer to ignore indexes on that column...!
So lets say we have table EMP with Emp_id and Emp_Name....
Also we have Non-Clustered index on Emp_Name.
So following query would NOT use Non-Clustered index on Emp_Name column.
SELECTLEFT(emp_name, 3) as emp3
FROMdbo.EMP
Is this true? i am using SQL Server 2008.
Removal Of Selected Indexes / Script Index Create For List Of Indexes
Jul 1, 2014I'm working to improve performance on a database I've inherited, and there are several thousand indexes. I've got a list of ones which should definitely exist within the database, and I'm looking to strip out all the others and start fresh, though this list is still quite large (1000 or so).
Is there a way I can remove all the indexes that are not in my list without too much trouble? I.e. without having to manually go through them all individually. The list is currently in a csv file.
I'm looking to either automate the removal of indexes not in the list, or possibly to generate the Create statements for the indexes on the list and simply remove all indexes and then run these statements.
As an aside, when trying to list all indexes in the database, I've found various scripts to do this, but found they all seem to produce differing results. What is the best script to list all indexes?
Transact SQL :: Key And Indexes On Two Column Data Table Or Parsed View (Large String Of Data And Filename)
Oct 4, 2015I am studying indexes and keys. I have a table that has a fixed width of data to be loaded in the first column which is parsed in a view based on data types within the fixed width specifications.
Example column A:
(name phone house cost of house,zipcodecountystatecountry)
-a view will later split this large varchar string basedÂ
column b: is the source filename of the data load (varchar 256)
....
a. would there be a benefit of adding a clustered or nonclustered index (if so which/point in direction on why)
b. is there benefit of making one of these two columns a primary key (millions of records) or for adding a 3rd new column as a pk?
c. view: this parses the data in column a so it ends up looking more like "name phone house cost of house zipcode county state country" each having their own column.
-any pros/cons of adding indexes (if so which) to the view instead of the tables or both for once the data is parsed?
Setup And Upgrade :: Cluster Installation Failed On Adding Node To Cluster
Oct 10, 2015During the installation of Adding node to a SQL Server failover cluster(On passive node) getting error like.. The MOF compiler could not connect with the WMI server. This is either because of a semantic error such as an incompatibility with the existing WMI repository or an actual error such as the failure of the WMI server to start.We  run the below commands but didn’t get any resolution & got the same above error .
Â
1<sup>st</sup> Method…
1. Open console command (Run->CMD with administrator privileges).Â
2. net stop winmgmtÂ
3. Rename folder %windir%System32WbemRepository to other one, for backup purposes (for example _Repository).Â
4. net start winmgmt
2<sup>nd</sup>Â Method..
1. Disable and stop the WMI service.
a) Command : - sc config winmgmt start= disabled
b. Command : - Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â net stop winmgmt
2. Run the following commands.
a). Command: Winmgmt /salvagerepository %windir%System32wbem
b). Command: Â Winmgmt /resetrepository %windir%System32wbem
3. Re-enable the WMI service
Command:Â Â Â Â Â Â Â Â Â sc config winmgmt start= autoÂ
Last command to run after above steps
4. Command:Â Â Â Â mofcomp "%programfiles(x86)%Microsoft SQL Server100Sharedsqlmgmproviderxpsp2up.mof"
File not found Error for above command.
Access Denied To Cluster Storage When Restoring 2005 Full Text DB To 2014 Cluster
Jun 10, 2015I am in the process of moving databases from a SQL 2005 Standard version to a 2-node 2014 cluster.All of my 2005 databases back up successfully.They all restore without issue except for one database that has a full text catalog. I get this message
Msg 7610, Level 16, State 1, Line 2
Access is denied to "fileStoragedataMSSQLSERVERFullTextCatalog", or the path is invalid.
Msg 3156, Level 16, State 50, Line 2
File 'sysft_FTCatalog' cannot be restored to 'fileStoragedataMSSQLSERVERFullTextCatalog'. Use WITH MOVE to identify a valid location for the file.
Msg 3119, Level 16, State 1, Line 2
Problems were identified while planning for the RESTORE statement. Previous messages provide details.
Msg 3013, Level 16, State 1, Line 2
RESTORE DATABASE is terminating abnormally.
[code]....
I went as far as giving the folder full access to everyone temporarily and received the same error.
SQL 2012 :: Advanced Cluster Preparation For New Instance On Existing Cluster
Apr 10, 2014I ran the Advanced cluster preparation for a new sql instance on an existing cluster.
Slq Server 2012.
After is completed, it was successful, I realized I specified the wrong Instance Root directory.
Is it possible to remove what the preparation installed? Or is it possible to change the root directory?
Setup And Upgrade :: Can Build Cluster By Adding Cluster Service
Jul 6, 2015Can I build a cluster by adding the cluster service, then the SQL instances, then add the other nodes and their passive SQL instances?I would lean to building the cluster first, the add the SQL instances.
View 4 Replies View RelatedSQL 2012 :: Server Cluster Without Windows Failover Cluster
Feb 18, 2014I´ve been reading that SQL Server 2012 Always On is dependent on having a Windows Failover Cluster setup. Is that correct ?
View 6 Replies View RelatedT-SQL (SS2K8) :: Convert Non-cluster Primary Key To Cluster Unique
Nov 6, 2014I have following script which i am planning to run to drop all non-clustered primary keys on a database and then created as clustered. I am using someone else's script so don't know how to modify this. Some of primary key columns are used in references in other tables.
is there anyway i can drop the existing primary keys and using their original script then create again as clustered including restoring all foreign and reference keys and unique or no unique.
DECLARE @table NVARCHAR(512), @tablename NVARCHAR(512),
@sql NVARCHAR(MAX), @sql2 NVARCHAR(MAX), @sql3 NVARCHAR(MAX),
@column NVARCHAR(MAX);
DECLARE @indexname NVARCHAR(512);
SELECT name As 'Table'
[Code] ....
Recovery :: Can Join A Node In Windows Cluster Which Is Already In Different Cluster
Oct 8, 2015can we join a node in a windows cluster which is already in a different cluster?
We have this requirement as we need to setup readable secondary ( always on AG) on the third node.
Recovery :: IP Change For Cluster / Nodes And Windows Cluster?
Jul 15, 2015We are planning to change all IPs of PRODUCTION Failover Cluster Setup. In my cluster setup ... we have 2 Physical Nodes with windows-2008, Roles are MSDTC and SQL-2008R2.
IP change for:
1. Both Nodes(Physical)
2. MSDTC
3. SQL ServerÂ
4. windows ClusterÂ
So Almost... All IPs are going to change.
Im DBA here, I need to take care of SQL cluster and MSDTC. But I haven't performed this activity before.So I'm worrying about Impacts and consequences of this change. steps how should I perform this activity.
Script To Change Cluster Index To Non Cluster
May 20, 2003Hi all,
We have many tables which have cluster index on column with datatype 'Char(200)'.
Does anyone have script to change cluster index to noncluster for all user tables which have clustered index on a column with 'char(200)' datatype.
Thanks,
Deepak
Transact SQL :: Difference Between Cluster And Non-cluster Index
Jul 26, 2015Wanted to know about difference between cluster and non cluster index with example.
When to use cluster index and non cluster index .
DB Engine :: Why Cluster And Non-cluster Indexed Created On Same Key
Jun 10, 2015CREATE TABLE [dbo].[Access](
 [AdminID] [int] NOT NULL,
 [FnID] [int] NOT NULL,
 CONSTRAINT [PK_AccessFn] PRIMARY KEY NONCLUSTERED
[Code] ....
why the cluster and non cluster indexed created on the same key?
A Question About Clustered Indexes Forcing Rebuild Of Non-clustered Indexes.
Sep 18, 2007So I'm reading http://www.sql-server-performance.com/tips/clustered_indexes_p2.aspx and I come across this:
When selecting a column to base your clustered index on, try to avoid columns that are frequently updated. Every time that a column used for a clustered index is modified, all of the non-clustered indexes must also be updated, creating additional overhead. [6.5, 7.0, 2000, 2005] Updated 3-5-2004
Does this mean if I have say a table called Item with a clustered index on a column in it called itemaddeddate, and several non-clustered indexes associated with that table, that if a record gets modified and it's itemaddeddate value changes, that ALL my indexes on that table will get rebuilt? Or is it referring to the table structure changing?
If so does this "pseudocode" example also cause this to occur:
sqlstring="select * from item where itemid=12345"
rs.open sqlstring, etc, etc, etc
rs.Fields("ItemName")="My New Item Name"
rs.Fields("ItemPrice")=1.00
rs.Update
Note I didn't explicitly change the value of rs.fields("ItemAddedDate")...does rs.Fields("ItemAddedDate")=rs.Fields("ItemAddedDate") occur implicitly, which would force the rebuild of all the non-clustered indexes?
SQL 6.5 Cluster Upgrade To SQL Server 7.0 Cluster
Jul 17, 2000I am trying to upgrade a SQL Server 6.5(Cluster) to SQL Serevr 7.0 (Cluster)..I already have an intsllation of 7.0(On a Cluster),so this means that 6.5 and sql 7 are on seperate cluster's ,if i try to upgrade from 6.5 Cluster to 7.0 Cluster is asks me to uncluster 6.5 and 7.0 is this correct ,assume i cannot break the cluster then what???.. what is the best way i can achieve this functinality.....
thanks in advance
Jack
SQL Server 2008 :: Logic To Rebuild Only Clustered Indexes / Skipping To Rebuild Non Clustered Indexes In Same Table
Jun 25, 2015I have a requirement to only rebuild the Clustered Indexes in the table ignoring the non clustered indexes as those are taken care of by the Clustered indexes.
In order to do that, I have taken the records based on the fragmentation %.
But unable to come up with a logic to only consider rebuilding the clustered indexes in the table.
create table #fragmentation
(
FragIndexId BigInt Identity(1,1),
--IDENTITY(int, 1, 1) AS FragIndexId,
DBNAME nvarchar(4000),
TableName nvarchar(4000),
[Code] ....
Indexes Vs Clustered Indexes
Sep 17, 2006What is the difference please?
View 1 Replies View RelatedHow To Upgrade SQL Server 2000 Cluster To SQL Server 2005 Cluster(Database)
May 8, 2007Hi
We are planning to upgrade the SQL Server in our production environment from SQL Server 2000 to SQL Server 2005. This is a 4 Node cluster environment with 3 Databases on 3 Virtual instances. The main requirement is to achieve this with no/minimal downtime.
Could you please suggest or direct me to any documentation for the best practices used to upgrade such an environment?
Thanks
Priyanka