Multiple Indexes On The Same Column
Jan 21, 2008
Hi 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
View 5 Replies
ADVERTISEMENT
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???
View 1 Replies
View Related
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
View 3 Replies
View Related
Aug 14, 2007
Hi,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 Related
Apr 15, 2008
I have a stored procedure that we use to search our inventory.
The sproc is using dynamic sql and executing a parameterized.
It generates the sql string based on all the parameters passed in.
I'm trying to figure out how I should set up the indexes on the table(s) being queried.
There are 12 different fields possible in the where clause and 7 different order by's.
I heard that SQL 2005 might hash together multiple indexes so should I create an index for each of these fields?
View 7 Replies
View Related
Nov 1, 2000
Okay this is a test...actually I am still learning SQL and need some help. Does anyone have any information on being able to move indexes from one database to another. My scenario is I have 3 databases, Development, QA and Production. I want to move/copy indexes I created in Development to the QA database. I have many indexes so I do not want to have to recreated them if I can avoid it. Any suggestions?
Thanks!
View 1 Replies
View Related
May 12, 2007
I have come across a problem executing a select with a multi-part where clause that only shows up if there are multiple indexes on the table. The situation using a simplified table is shown below
create table tblTest( utcTimestamp datetime NOT NULL, testType int NOT NULL)go
insert into tblTest (utcTimestamp, testType) VALUES('6/1/2003 0:0:0', 100)go
Now, without adding any indexes to the table, I can execute the following select and it works fine, returning the single row in 2003:
select * from tblTest where utcTimestamp < '1/1/2004 0:0:0' and utcTimestamp > '1/1/2003 0:0:0' and testType = 100go
Furthermore, if I introduce a single descending index on just the utcTimestamp:
CREATE INDEX IX_tblTest_Timestamp ON tblTest (utcTimestamp DESC)go
the search still works.
HOWEVER, if I now introduce another index:
CREATE INDEX IX_tblTest_EntryType_Timestamp ON tblTest ( testType, utcTimestamp DESC)go
the search does **not** return the row.
However, if I change the where clause to remove the test of testType:
select * from tblTest where utcTimestamp < '1/1/2004 0:0:0' and utcTimestamp > '1/1/2003 0:0:0'go
it works.
Also, strangely, if I populate the table with a number of records with different dates and execute the following search:
select * from tblTest where utcTimestamp > '1/1/2004 0:0:0' and testType = 100go
I get records from **earlier** than 1/1/2004 (i.e. like the sense of the compare is wrong)
Finally, as I was writing this report, I discovered that all of these problems go away if the DESC is removed from the indexes - so that's my workaround, but it still looks like a bug.
Thanks
Lionel
View 1 Replies
View Related
Sep 21, 1999
The 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 Related
Feb 5, 2014
We have two non cluster indexes on the same column for a table. let me know will it impact negatively on table like performance etc. ?
View 4 Replies
View Related
Jan 25, 2008
Anyone 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
View 4 Replies
View Related
Jan 16, 2013
I work in the healthcare area, and am handling the survey data ETL's. There are around 8 different survey areas and based on information received from them for the visit they reference, I want to pull in more info from our invoicing database. My idea is this:
1.)Â Pull in the flat file to an ODBC staging table
2.)Â Cache all invoice records that fall between the MIN(Date of Service) and MAX(Date of Service) from the staging table.
3.)Â First lookup the information needed on patientID, providerID, date of service, and billing location.
4.)Â For the surveys that didn't match on those 4 columns, try looking up based on patientID, date of service, and billing location (since I could be 99% sure this would still return the record I need).
5.) For the remaining surveys, lookup based just on patientID and date of service. These records will be flagged for manual review because clearly, if a patient has multiple appointments in the same day, this will be prone to error.
However, in trying to use only 3 of the columns in the lookup, I get the error saying basically that I need to utilize all 4. Is there a way around this, or is there an entirely different way I should be approaching this? The reason I thought cache transform was the answer is because I will need to run a different package for each lookup, as the data and logic between each survey will vary, but the invoice data "pool" will stay the same regardless.Â
View 5 Replies
View Related
Feb 17, 2004
Is 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 Related
Apr 3, 2002
I 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!
View 2 Replies
View Related
Apr 3, 2015
I'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 Related
Oct 12, 2015
I 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 ?
View 2 Replies
View Related
Mar 3, 2008
Please can anyone help me for the following?
I want to merge multiple rows (eg. 3rows) into a single row with multip columns.
for eg:
data
Date Shift Reading
01-MAR-08 1 879.880
01-MAR-08 2 854.858
01-MAR-08 3 833.836
02-MAR-08 1 809.810
02-MAR-08 2 785.784
02-MAR-08 3 761.760
i want output for the above as:
Date Shift1 Shift2 Shift3
01-MAR-08 879.880 854.858 833.836
02-MAR-08 809.810 785.784 761.760
Please help me.
View 8 Replies
View Related
Feb 25, 2015
I need to update multiple columns in a table with multiple condition.
For example, this is my Query
update Table1
set weight= d.weight,
stateweight=d.stateweight,
overallweight=d.overallweight
from
(select * from table2)d
where table1.state=d.state and
table1.month=d.month and
table1.year=d.year
If table matches all the three column (State,month,year), it should update only weight column and if it matches(state ,year) it should update only the stateweight column and if it matches(year) it should update only the overallweight column
I can't write an update query for each condition separately because its a huge select
View 7 Replies
View Related
Aug 22, 2007
Hi,
I have multiple columns in a Single Table and i want to search values in different columns. My table structure is
col1 (identity PK)
col2 (varchar(max))
col3 (varchar(max))
I have created a single FULLTEXT on col2 & col3.
suppose i want to search col2='engine' and col3='toyota' i write query as
SELECT
TBL.col2,TBL.col3
FROM
TBL
INNER JOIN
CONTAINSTABLE(TBL,col2,'engine') TBL1
ON
TBL.col1=TBL1.[key]
INNER JOIN
CONTAINSTABLE(TBL,col3,'toyota') TBL2
ON
TBL.col1=TBL2.[key]
Every thing works well if database is small. But now i have 20 million records in my database. Taking an exmaple there are 5million record with col2='engine' and only 1 record with col3='toyota', it take substantial time to find 1 record.
I was thinking this i can address this issue if i merge both columns in a Single column, but i cannot figure out what format i save it in single column that i can use query to extract correct information.
for e.g.;
i was thinking to concatinate both fields like
col4= ABengineBA + ABBToyotaBBA
and in search i use
SELECT
TBL.col4
FROM
TBL
INNER JOIN
CONTAINSTABLE(TBL,col4,' "ABengineBA" AND "ABBToyotaBBA"') TBL1
ON
TBL.col1=TBL1.[key]
Result = 1 row
But it don't work in following scenario
col4= ABengineBA + ABBCorola ToyotaBBA
SELECT
TBL.col4
FROM
TBL
INNER JOIN
CONTAINSTABLE(TBL,col4,' "ABengineBA" AND "ABB*ToyotaBBA"') TBL1
ON
TBL.col1=TBL1.[key]
Result=0 Row
Any idea how i can write second query to get result?
View 1 Replies
View Related
Aug 25, 2015
I 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?
View 2 Replies
View Related
Sep 18, 2015
I 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 Related
Aug 14, 2015
I have the following  database structure
Stock     Depth41   Depth12   Depth34
AAA Â Â Â Â Â Â 1 Â Â Â Â Â Â Â 2 Â Â Â Â Â Â Â 1
BBB Â Â Â Â Â Â 2 Â Â Â Â Â Â 2 Â Â Â Â Â Â Â 4
How can I show  Each Depth column as seperate row
AAA Â Â Â Â Â 1
AAA Â Â Â Â Â 2
AAA Â Â Â Â Â 1 Â as follows
View 3 Replies
View Related
May 25, 2015
Somewhere 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.
View 4 Replies
View Related
Jul 1, 2014
I'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?
View 5 Replies
View Related
Sep 16, 2004
This is a report I'm trying to build in SQL Reporting Services. I can do it in a hacky way adding two data sets and showing two tables, but I'm sure there is a better way.
TheTable
Order# Customer Status
STATUS has valid values of PROCESSED and INPROGRESS
The query I'm trying to build is Count of Processed and INProgress orders for a given Customer.
I can get them one at a time with something like this in two different datasets and showing two tables, but how do I achieve the same in one query?
Select Customer, Count (*) As Status1
FROM TheTable
Where (Status = N'Shipped')
Group By Customer
View 2 Replies
View Related
Feb 27, 2008
Hello,
I need to concatenate a column from multiple rows into a single column in a new table.
How can I do this?
SID NAME PGROUP
------------------------------------------------------------
3467602 CLOTHINGACTIVE
3467602 CLOTHINGDANCE
3467602 CLOTHINGLWR
Need to have
SID NAME PGROUP
------------------------------------------------------------
34676 02 CLOTHING ACTIVE , DANCE, LWR
THANK YOU
View 10 Replies
View Related
Aug 7, 2007
I have a stored proc I am updating in an OLEDB Command from the results of a Transform Script Component. The Stored Proc has over 65 input parameters, most of them have a NULL passed in. I dont want to create output columns in the Transform Script Component for all of them to map them from the "Available Input Columns" to "Available Destination Columns".
I want to create 3 or 4 generic Output columns for their data type - say IntegerOutput (datatype Int), DateTimeOut (datatype datetime) and so on. The I want to map these generic columns in the OLEDB Command as Available Input Columns" to multiple "Available Destination Columns" - wherever the datatype matches the input column.
But the OLEDB Command Column Mappings let me map One to One only. This will create a huge and unnecessary workload for me to develop and maintain - when I tell you I have 3 such stored procedures, all of whose interfaces are exactly same and for which I can create similar Output columns in the Transform Script Component.
So how do I go about doing this the smart way?
thanks in advance!
View 4 Replies
View Related
Jul 17, 2015
I have a SQL Query issue you can find in SQL Fiddle
SQL FIDDLE for Demo
My query was like this
For Insert
Insert into Employee values('aa', 'T', 'qqq')
Insert into Employee values('aa' , 'F' , 'qqq')
Insert into Employee values('bb', 'F' , 'eee')
Insert into Employee values('cc' , 'T' , 'rrr')
Insert into Employee values('cc' , 'pp' , 'aaa')
Insert into Employee values('cc' , 'Zz' , 'bab')
Insert into Employee values('cc' , 'ZZ' , 'bac')
For select
select col1,MAX(col2) as Col2,Max(Col3) as Col3
from Employee
group by Col1
I supposed to get last row asÂ
  cc  Zz  bab
Instead I am gettingÂ
 cc  Zz  rrrÂ
which is wrong
View 8 Replies
View Related
Oct 14, 2015
LeaveEntitlementID PeriodID LeaveType EmployeeID NumberOfDays
1 1 Annual 1 10
2 1 Annual 1 10
3 1 Sick 2 10
4 2 Sick 2 10
5 2 Sick 2 10
I have the above table (LeaveEntitlement) which has the above columns.
What I want to sum the column NumberOfDays based on EmployeeID, LeaveType and PeriodID columns as of LeaveTypeNumberOfDays.
For example sum(NumberOfDays) where PeriodID=1 and EmployeeID=1 and LeaveType=Annual
The result should be shown in new column name AnnualLeave (20)
sum(NumberOfDays) where PeriodID=1 and EmployeeID=1 and LeaveType=Sick
The result should be shown in new column name SickLeave (10)
Same all leave Types
The table should be shown as the below after executing the query
LeaveEntitlementID PeriodID EmployeeID AnnualLeave SickLeave
1 1 1 20 0
2 1 2 0 10
3 2 2 0 20
is it possible in sql server
View 8 Replies
View Related
Sep 29, 2015
I have below dataset and i want to convert as per my requirement.
Dataset:
In the above dataset, if i take 9/5/2015 then i should get like below,
View 10 Replies
View Related
Oct 4, 2015
I 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?
View 4 Replies
View Related
Jul 22, 2015
how to declare multiple derived columns in SSIS Derived Column Task in one attempt.as i have around 150 columns coming from Flat file. I had created the required Expression in Excel and now i want add those in derived column task but its allowing only 1 expression at a time.
View 4 Replies
View Related
Sep 18, 2007
So 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?
View 4 Replies
View Related
May 14, 2008
I need to query out multuple rows of data from the following table and retrieve it as a single row. Ideally, I'd like to do some sort of subquery that supports multiple columns, but as far as I know, that only exists on Oracle, not MSSQL.
Here's an example of the data:UserDefinedFieldId UserDefinedRowID FieldValue1 1 date (stored as text)2 1 text3 1 text1 2 date (stored as text)2 2 text3 2 text...27 UserDefinedFieldIds for each row in the actual table
I wrote a working query, but I need something more efficient for this particular application. (The query to do this must fit in a 2000char data field--with all 27columns brought in with separate subqueries, I'm pushing 5000.) Already tried shorter table names, which only saved me about a 1000 characters.
SELECT (SELECT SecondaryTable.FieldValue FROM UserDefinedData AS SecondaryTable WHERE SecondaryTable.UserDefinedRowID = PrimaryTable.UserDefinedRowId AND SecondaryTable.UserDefinedFieldId = 1) AS Column1, ,,, (SELECT SecondaryTable.FieldValue FROM UserDefinedData AS SecondaryTable WHERE SecondaryTable.UserDefinedRowID = PrimaryTable.UserDefinedRowId AND SecondaryTable.UserDefinedFieldId = 27) AS Column27,FROM UserDefinedData AS PrimaryTableWHERE PrimaryTable.UserDefinedFieldId = 5 AND Cast(Cast(PrimaryTable.FieldValue AS varchar(64)) AS datetime) > GetDate() ORDER BY PrimaryTable.UserDefinedRowID, PrimaryTable.UserDefinedFieldId
Any suggestions would be appreciated.
Thanks,
Brad
View 3 Replies
View Related
