Create An Indexes/Keys Property With T-SQL
May 19, 2004is there a function that i can use in a store procedure that allow me to create an Indexes/Keys Property
thanx
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Creating Indexes On Columns That Are Foreign Keys To Primary Keys Of Other Tables
Jul 16, 2014what the best practice is for creating indexes on columns that are foreign keys to the primary keys of other tables. For example:
[Schools] [Students]
---------------- -----------------
| SchoolId PK|<-. | StudentId PK|
| SchoolName | '--| SchoolId |
---------------- | StudentName |
-----------------
The foreign key above is as:
ALTER TABLE [Students] WITH CHECK ADD CONSTRAINT [FK_Students_Schools]
FOREIGN KEY([SchoolId]) REFERENCES [Schools] ([SchoolId])
What kind of index would ensure best performance for INSERTs/UPDATEs, so that SQL Server can most efficiently check the FK constraints? Would it be simply:
CREATE INDEX IX_Students_SchlId ON Students (SchoolId)
Or
CREATE INDEX IX_Students_SchlId ON Students (SchoolId, StudentId)
In other words, what's best practice for adding an index which best supports a Foreign Key constraint?
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?
Keys And Indexes
May 26, 2008 i have some confusions with keys and indexes.. plz let me know whether the following are correct..- Every Primary Key is a Clustered Index- A Primary Key cannot exist without a Clustered Index- Every Unique Key is a Non-Clustered Index - Non-Clustered Index is the DEFAULT Index- A table can have only 1 Primary key- A table can have only 1 Clustered Index- A table can have any number of Unique Keys- A table can have any number of Non-Clustered Indexes
List Of Keys, Indexes
Oct 29, 2005Hello,
I am new in SQL Server, I have to deal with this big database with many tables, is there any way I can get a list of all primary keys , foreign keys and indexes and on all tables?
Thanks,
Indexes In Primary Keys
May 6, 2005I have a 3rd party app which had a primary key with about 5 fields. The last field of this was a trantype. This app had a posting process which uses this in it's sql. Ran rather slow. We added an individual index to this field and cut processing down 90%. It almost seemded like sl server was ignoring this index. Is this because it was the last field in the primary key index?
View 1 Replies View RelatedHow To Drop All Keys && Indexes
Jul 20, 2005I'm trying to drop all indexes and primary keys so that i can rebuild them(from a script created from same database on another server).when i go to the 'generate sql scripts', it has the ability to drop orgenerate alltables. it also has the ability to generate all keys only. but i cant finda wayto drop all of these keys...any ideas?tiawoody rao
View 1 Replies View RelatedClustered Indexes On Primary Keys
Aug 18, 2006All of the 3 books I've read say it is not a good idea to create a clustered index on the primary key but it is created as the default. My question is has this changed in 2005? My understanding is to create the clustered index on columns used first in join clauses and then in where clauses, what is the answer?
View 14 Replies View RelatedUnique Colm Indexes And Primary Keys
Jan 25, 2006I have a deal table, each of these investments must be unique. I created a int pk : idDeal. Does that make sense or should i just use the deal colm being it has a unique constraint,
Reguarding indexes, should i make the auto # colm my pk and make that the clustered index? and put another index on the Deal Colmn? Any suggestions welcomed
Thank you
Do Foreign Keys Generate Implicit Indexes?
Sep 21, 2007If i create a simple table with a foreign key constraint, does itcreate an implicit index on that given ID? I've been told this isdone in some databases, but i need to know for sure if SQL Server doesit. Has anyone heard of this before, on any other databses perhaps?Heres an example of how the foreign key constraint is being added:ALTER TABLE [dbo].[administrators] WITH CHECK ADD CONSTRAINT[FPSLUFSUOXZGAJOJ] FOREIGN KEY([AdministratorRoleID])REFERENCES [dbo].[administratorroles] ([AdministratorRoleID])My initial testing seems to indicate adding an index on the foreignkey column helps, but i need to know for sure. Any insight would begreatly appreciated!Bob
View 6 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 ?
SSIS 2000 To 2005 Database Transfer Lost All Primary Keys, Identities And Indexes
Mar 25, 2008Hi everyone, I am trying to upgrade a 2000 DB to 2005 with SSIS Database Transfer.
I finally got it to work with an online transfer but the destination database has no primary keys, indexes or identity columns from the source DB.
What am I missing?
What other ways are there to upgrade a SS2000 DB to 2005?
Thank you.
Composite Primary Keys Versus Composite Unique Indexes
Feb 20, 2007Hello,
I have a table which has a composite primary key consisting of four columns, one of them being a datetime called Day.
The nice thing afaik with this composite key is that it prevents duplicate entries in the table for any given day. But the problem is probably two-fold
1. multiple columns need to be used for joins and I think this might degrade performance?
2. in client applications such as asp.net these primary keys must be sent in the query string and the query string becomes long and a little bit unmanagable.
A possible solutions I'm thinking of is dropping the existing primary key and creating a new identity column and a composite unique index on the columns from the existing composite key.
I would like to have some tips, recommendations and alternatives for what I should do in this case.
Create Table With Foreign Keys
May 30, 2007How do I create a table with a foreign key
View 6 Replies View RelatedCreate Identical Symmetric Keys On Two Servers?
Apr 17, 2015why my script is not allowing me to DECRYPTBYKEY once I restore my DB from PRODUCTION BACKUP....
-- SET Staging to Single User Mode to be able to RESTORE DB---
-- STEP 1 (Works No Problems Here)
USE master;
GO
ALTER DATABASE Staging
SET SINGLE_USER
WITH ROLLBACK IMMEDIATE;
GO
RESTORE DATABASE Staging
FROM DISK = 'C:Program FilesMicrosoft SQL ServerMSSQL11.MSSQLSERVERMSSQLBackupMyDBRestore.bak' ;
GO
-- STEP 2 - USE ONLY IF THE ABOVE IS UNSUCCESSFUL ||| FAILURE ****** RESTORE RUN THE FOLLOWING SCRIPT -----
--If the above is successful the DB sets itself back to MULTI_USER
--ALTER DATABASE Staging
--SET MULTI_USER;
--GO
--ALTER DATABASE Staging
--SET READ_WRITE
--GO
-- STEP 3 (Works No Problems Here)
--------------- @@@@@@@@@@@@@@ IMPORTANT UNCOMMIT AND RUN @@@@@@@@@@@@@@@@@@@@@@@@@ MANUAL STEPS ----------------------
-- RBD - Recreate Security ID'S AND PERMISSIONS FOR Stored Procedure EXECUTE RIGHTS, because PASSWORDS are different on lower
-- environments
--USE [Staging]
--GO
--/****** Object: User [WebUser] Script Date: 4/13/2015 11:15:51 AM ******/
--DROP USER [WebUser]
[code]....
Create Indexes In SQL 7.0
Mar 13, 2000When creating the indexes on the table, SQL 7.0 also created some type of system indexes ( ex. _WA_Sys_curr_int_rate_2C88998B nonclustered, statistics, auto create located on PRIMARY, etc. ). I want to know how can I clear up these system indexes.
View 1 Replies View RelatedCreate Indexes
Mar 3, 2006Slayer writes "Probably a really lame question but in the absence of our DBA I have been asked to create a couple of indexes on a table. No problem with that, just need to know if this is a safe operation whilst users are using the database.
Thanks for your help"
T-SQL (SS2K8) :: Combining Keys To Create A Master List?
Mar 5, 2014I am struggling trying to clean some data and identify duplicate records. I used fuzzy grouping in SSIS and provided back a series of groups. The issue is some of the individual records can appear in multiple groups (so in reality the groups should be combined). This is best explained with an example:
Original Data
key1 key2
647942600014
647942285437
2324662490640
2324662285437
2324662066128
2222 2285437
2222 1111111
9999 1111111
9999 2222222
Should look like:
22222600014
22222285437
22222490640
22222066128
22221111111
22222222222
I only choose 2222 as the surviving key because it was the smallest number. I really do not care which number remains as long as it is the same across.
I tried playing with self joins between the tables but have had no success.
I am using Sql Server 2008 and the number of records could 500K to 1MM.
SQL 2012 :: Create Table With Both Keys As Foreign (error)
Dec 15, 2014I'm trying to create a table in Microsoft Server Management Studio 2012. The table has two fields which are both foreign keys.
I created the following:
create table tblRoomEquipment(
RoomID nvarchar(8),
EquipmentType nvarchar(1),
foreign key (RoomID) references tblRoom(ID),
foreign key (EquipmentType) references tblEquipment(Type)
)
Both tblRoom and tblEquipment have the red line error which when I highlight say the they both reference an invalid table!
Both tables are there and have primary keys defined as ID & Type. I have searched around and all I could find was that there maybe a permission problem.
Does 7.0 Create Permanent Indexes On Its Own??
Oct 29, 1999Hello,
A few months ago, the company I work for switched to SQL 7.0 from 6.5. All is running fine but recently I noticed that we have a ton of indexes on each table that start like this: _WA_SYS_....0B679CE2 (here are some specific examples: _WA_SYS_PRODUCT_LINE_0B679CE2, _WA_SYS_RMA_DISPOSITION_0B679CE2)
Did SQL 7.0 do this? If so why? What is it trying to do? Why doesn't it use current indexes (clustered and non-clustered)? Why don't they get Fragmented like User defined indexes? I have a lot of questions associated with this if someone can explain it.
Tech Net, MSDN, BOL and other manual resources don't mention anything about it. At least I haven't found anything on it and I have spent some time looking.
Please help if you can.
Troy
SQL 2012 :: Create New Indexes
May 24, 20141)When we create Indexes, key columns are the columns that use in where clause and included columns are the columns that can be used in the select list and on join clause column.
2) I am thinking that we have to create new Index, only if we found at least 50 msec time save.
Create Indexes Within SSMS
Jun 15, 2008I found out how to create clustered index using TSQL, but how can you create clustered index and manage indexes using SQL Server Management Studio?
Thanks
Goldmember
Quicker Way To Create Indexes
Jul 18, 2006Hi,I have a new job. It needs to drop and re-create (by insert) a tableevery night. The table contains approximately 3,000,000 (and growing)records. The insert is fine, runs in 2 minutes. The problem is thatwhen I create the indexes on the table, it is taking 15-20 minutes.There is one clustered index and 11 non-clustered. This is a lookuptable that takes many different paremeters, so it really needs theindexes for the user interface to run efficiently. However, thedatabase owners aren't keen on a job taking 20 minutes to run everynight.Any ideas?
View 5 Replies View RelatedRe-Create All Indexes In Database
Jun 17, 2006First, I'd like some help stablishing if it's a good idea or not what I'm thinking, and second is what would be the easyist way to achive the result.
Background. We have a multicompany ERP system (200GB, 200+ tables). All data tables have a companyid, counter1id, counter2id, fields. Each table has a primary clusterd index on these fields in that order. And also has multiple other indexes that usually include companyid filed first. ( Note we have 10 companies, ids are 1..10, companies 2 and 5 are the most active, inserts, selects ). MY GUESS IS THAT THIS IS VERY BAD HAVING COMPANYID FIRST. AM I CORRECT? LEADS TO AL LOT OF FRAGMENTATION? VERY BAD TO FIND DATA ON THE INDEXES?
I want to re-create all my indexes and have them counter2id, companyid, counter2id. ( counter1id is a counter for each company, and counter2id is a global counter like identity ) GOOD OR BAD IDEA?
Since I have hundreds of indexes what is the correct procedure? I was thinking on scripting the database, then dropping all indexes, then recreate clustered indexes, then recreate other indexes. Do I have to take care of anything else foreing relationships, etc.
Auto Create Statistics / Indexes
Sep 1, 2000Hi everyone,
I know that statistics called _WA_... are created on tables when auto create statistics is set on a database. Is this an indication that queries against the table would perform better if indexes were created on the columns in question? (The tables I'm interested in optimising are used equally for transactional querying and reporting)
Thanks for any replies!
Les
Using Alter Statements To Create Indexes?
Apr 19, 2006I am new to writing SQL code and I read that you can use ALTER statements to create an index for a table. How would I go about doing that? Everything that I have tried in Query Analyzer comes up with an error.
Any help is appreciated.
Create Indexes - Own File Group
Mar 12, 2007With help of others on this group, I've been learning and researchingabout indexes; an area I neglected.I see I can specify which filegroup I wish to create an index, whichthe default is Primary.I have more than one drive in my SQL server where I put data and logson their own logical raid groups.My databases are SIMPLE, so they dont use much, if any logs (none as Iunderstand).I was thinking of adding an additional file to my database and use itsolely for the indexes.Any thoughts?SQL Server 2005 Enterprise x64 SP28 disk SAS Raid 1+0 w/ 512mb ram w/ battery backup.Thanks,Rob
View 2 Replies View RelatedShould I Create Indexes On Views Or Tables
May 22, 2007I have a pretty large database that has tables that will contain millions of rows of records. I will predominantly be using Views just to select the data. (I will not be performing any updates or inserts). I propose creating indexes on the views. My question is - if I create indexes on my views, do I have to create them on the tables as well? Is it good practice to create indexes on tables by default even if I am not going to be performing select statements directly on my tables but via my indexed views? Any advice is appreciated.
Thanks
Ran
How To Create Apps That Write Code To Retrieve Data With Foreign Keys?
Apr 6, 2007Hi GuysOff late, I've grown with programming that requires more than a number of tables that has foreign keys with other tables' primary keys. It takes a really cumbersome coding to retrieve the code from another table with the other table having foreign keys. My question is, how do we program VS 2005 such that it does all the retrieval of the data from the database instead of us writing the code all by ourself?Is it really good database technique to bend the normalcy rules and have one to two columns having redundant data?Can anyone tell me how to write code that retrieves the foreign key data when the data from the other table is called?Thanks
View 2 Replies View RelatedIntegration Services :: Create SSIS Package Checkpoint-file Property With UNC Path
Aug 26, 2015I can set the propperty of the checkpoint file to a local drive, but not to a UNC path mapping, mapping to my host server. (loop back)
Example: "I:FILEFILE1$InputArchiveOntwikkel " is possible as checkpoint file property.
S11487O$InputArchiveOntwikkel is not possible, though this is the same folder on the local host.
For data source both unc path and drive mapping are allowed. Why this difference?
Need To Create Case Sensitive Uniqiue Indexes
Jul 20, 2005Hi,How Can I create a case sensitive unique index so that A1 and a1 are treatedas different ?I dont mind if I have to make a global DB change.Steve
View 1 Replies View RelatedTransact SQL :: Create Table Indexes In SSMS2012
May 26, 2015I use Indexes Fundamentals of Microsoft SQL Server - Lesson 30: Indexes in the website of URL... to learn the basic things of Indexes. In my SQL Server 2012 Management Studio (SSMS2012), I executed the following code..
-- scFTX_CreateTableEmployees.sql
-- saved in C:/Documents/SQLServerIndexes_downloadCode
-- 26 May 2015 10:52 AM
USE ScottChangDB;
GO
CREATE TABLE Employees
[code]....
Where the SCHEMA and the index 'IX_Employees are located in the Object Explorer of the database "ScottChangDB" of my SSMS2012.
Update Rows To Resolve Issues About Duplicate Keys On Create Unique Index
May 7, 2008
Hi there ...here comes a tricky one.
I have a database table which needs to make the Index "ParentREF, UniqueName" unique - but this fails because duplicate keys are found. Thus I now need to cleanup these duplicate rows - but I cannot just delete the duplicates, because they might have rows in detail tables.
This means that all duplicate rows needs an update on the "UniqueName" value - but not the first (valid) one!
I can find those rows by
SELECT OID, UniqueName, ParentREF, CreatedUTC, ModifiedUTC FROM dbo.CmsContent AS table0
WHERE EXISTS (
SELECT OID, UniqueName, ParentREF FROM dbo.CmsContent AS table1
WHERE table0.ParentREF = table1.ParentREF
AND table0.UniqueName = table1.UniqueName
AND table0.OID != table1.OID
)
ORDER BY ParentREF, UniqueName, ModifiedUTC desc
...but I struggle to make the required SQL (SP?) to update the "invalid" rows.
Note: the "valid" row is the one with the newest ModifiedUTC value - this row must kept unchanged!
ATM the preferred (cause easiest) way is to rename the invalid rows with
UniqueName = OID
because if I use any other name I risk to create another double entry.
Thanks in advance to whoever can help me