Hi All,
I want to know what will be the impact of changing the primarykey on a table which already has a lot of data.
For example, column A is unique, primary key. I want to make column B as unique, primary key.
Can I do that? What will be the impact on database performance?
Thanks
Sri
Hi
We have a merge publication - I want to change the primary key for one of the tables (add another column to the primary key)
How do I do it ?
Currently there is no data in the table - which I guess might help..
thanks
Bruce
I noticed that a database I am working with has a compatibility level set to SQL Server 2000. The instance is actually SQL Server 2005. I'm guessing that it was created like this because the database originally existed on 2000 and was created via backup/restore.
I'm trying to figure out if this needs to be changed and if so how to go about making the change in a non-disruptive manner. What features of 2005 are turned off as a reult of having a 2000 compatibility level?
I have added a Slowly Changing Dimension transformation to an SSIS package and have launched the Wizard to edit it. After selecting the source (a SQL Server 2005 instance), if I select a very large table (9+ million rows), I'm encountering two strange behaviors:
1. The wizard hangs for several minutes before displaying the columns from that table.
2. The wizard does not display the primary key column. This, of course, is the column I want to designate as the "business key", but can't because it's not displayed.
I know this is more like a fact table than a dimension, but this is not a data warehouse. This is just a very large table, and I need to update a field in certain records based on the contents of a source text file. Is there another transformation I should use to perform updates?
Hello, everyone:
I want to add a column, INT NOT NULL DEFAULT 0, to a table. There are about 9 mil. records, 57 columns in the table. SQL 2k on Win 2003. What impact maybe bring?
1) Is there a down time on database and server?
2) Is it possible to insert records during adding new column?
3) How long will be taken roughly?
Thanks a lot.
ZYT
Just a quick easy question. If I alter a table (add a column to the table), will it take the table offline during the ALTER process? I am adding the column to the end of the table not in the middle. I know if I add it in the middle it will offline the table.
View 4 Replies View RelatedSQL Server 2000:
Question 1
If you drop / rename a table and then recreate the table with the SAME NAME, what impact does it have on stored procedures that use these tables? From a system perspective, do you have to rebuild / recompile ALL the stored procedures that use this table?
I had a discussion with someone that said that this is a good idea, since the IDs of the tables change in sysobjects and from a SQL SERVER query plan perspective, this needs to be done...
Question 2
If you Truncate a Table as part of a BEGIN TRANSACTION, what happens if an error occurs? Will it Rollback? The theory is that it won't because Truncate doesn't utilize the logs where as Delete From uses the SQL Logs?
Thanks!
What causes SQL Server 2000 to create tables with default column sizes of 8000 for a varchar datatype??
I would assume this can cause significant performance problems.
(see attached)
What is the impact on the users to drop an index on a table while in use? I will recreate the index afterwards. The table is used constantly by a three of processes/users at all times.
View 3 Replies View RelatedHi all,
Can anyone suggest me on Adding primary key to a table which has already a primary key.
Thanks,
Jeyam
I need to add a child table that will tell us who the participants counselor is, what I did was I did a Make Table query based off the primary key of the Parent table and made that the link (foreign key) for the People_tbl and the Counselor_tbl, so if the counselor changes then the user adds the record to the counselor tbl and then puts in the Effective date. The problem is that when I run a report it doesn't show the present counselor always shows the old counselor?
Code:
SELECT Student_ind.StudentFirstName, Student_ind.StudentLastName, Student_ind.[Student ID], People_tbl.[Family ID], People_tbl.FirstName,
People_tbl.LastName, People_tbl.[Parent ID]
FROM People_tbl RIGHT OUTER JOIN
Student_ind ON People_tbl.[Family ID] = Student_ind.[Family ID]
WHERE (People_tbl.LastName = @Enter_LastName) AND (People_tbl.FirstName = @Enter_FirstName)
Previously same records exists in table having primary key and table having foreign key . we have faced 7 records were lost from primary key table but same record exists in foreign key table.
View 3 Replies View Related
Hi all,
my stored procedure have one table variable (@t_Replenishment_Rpt).I want to create an Index on this table variable.please advise any of them in this loop...
below is my table variable and I need to create 3 indexes on this...
DECLARE @t_Replenishment_Rpt TABLE
(
Item_Nbr varchar(25) NULL,
Item_Desc varchar(255) NULL,
Trx_Date datetime NULL,
Balance int NULL,
Trx_Type char(10) NULL,
Issue_Type char(10) NULL,
Location char(25) NULL,
Min_Stock int NULL,
Order_Qty int NULL,
Unit char(10) NULL,
Issue_Qty int NULL,
Vendor varchar(10) NULL,
WO_Nbr varchar(10) NULL,
Lead_Time int NULL,
PO_Nbr char(10) NULL,
PO_Status char(10) NULL,
Currency char(10) NULL,
Last_Cost money NULL,
Dept_No varchar(20) NULL,
MSDSNbr varchar(10) NULL,
VendorName varchar(50) NULL,
Reviewed varchar(20) NULL
)
I tryed all below senarios...it is giving error...
--Indexing the @t_Replenishment_Rpt table on the column Names Item Number, Vender , Department Number
--EXEC sp_executesql(CREATE UNIQUE CLUSTERED INDEX Replenishment_index ON @t_Replenishment_Rpt (Item_Nbr))
--CREATE UNIQUE CLUSTERED INDEX Idx1 ON @t_Replenishment_Rpt.Item_Nbr
INDEX_COL ( '@t_Replenishment_Rpt' , ind_Replenishment_id , Item_Nbr )
--EXEC sp_executesql('SELECT INDEXPROPERTY('+ '@t_Replenishment_Rpt' + ', ' + 'Item_Nbr' + ',' + 'IsPadIndex' + ')')
--EXEC sp_executesql(SELECT INDEXPROPERTY('@t_Replenishment_Rpt', 'Vendor','IsPadIndex'))
--EXEC sp_executesql(SELECT INDEXPROPERTY('@t_Replenishment_Rpt', 'Dept_No','IsPadIndex'))
OK, I have figured out how to hide the sys views and Information_Schema views from users but before I try it on the live database I have a question:
If I Deny Select on the Master Public Role for the sys views and Information_Schema views, what impact will this have for users other than not being able to see those views? Anyone know this?
Your feedback is greatly appreciated.
Thanks.
Hi i have set up two very simple tables, I want a user to be able to create a basic account ( data stored in User_Profile table with Id set as the Primery Key as Identity) I
want the user to be able to be able to return to their account at a later date
and then post multiple reviews of different bands they have seen at a later date.
I kept the tables in my example very simple so I could get my head
around the concept, but generally, I want to connect the Id (PK) value in
User_Profile table to the User_Id filed in the User_Review table,
so every review that user writes, will be connected directly to their Id.
Any help you could give would be fantastic a i have no idea where to start!!!
User_Profile
Id int, ( as primary Identity Key)
Name
City
Country
I have a second table called User Reviews
User_Revews
Revew_Id int , ( as primary Identity Key)
User_Id int, ( I want this to contain the Id value in
the User profile Table)
Review_Details
Thanks
Odxsigma
mahesh writes "HI,
I am new to sql server.
can anybody help me
I have a table named tblqualificationmaster.
can i know the foreignkeys and the table related to this
tblqualificationmaster having foeign keys using stored procedure."
Hi,
I have a Users table that I use for membership. I am using username varchar(30) as the primary key for this table since username will always be unique.
The question I have is regarding how SQL Server actually stores data:
I see that when I add users, they are always stored alphabetically sorted on username.
I was expecting that all users will appear on the users table in the order they were added.
Example: I have 3 users (john, jonah, wilson). Now I added 4 user with username='bob'
If I execute select * from users, it returns me (bob, john, jonah, wilson). Look bob has become the first row of the table.
My question: Is Sql server moving 3 older rows to make room for 'bob' and it is also rebuilding part of the index due this new username 'bob'?
If this is the case, then it will have big impact if I have 100K users and I add one user that becomes firstrow. In that case 99,999 rows will have to move.
Bottom line, insert, delete will be very expensive.
I know sql server keeps data physically sorted on PK. But I am concerned here since rows are losing the order in which they were inserted.
Thanks
Hi All,
If the column names are changed , is there are a easy way to change the referred columns in the SP's. What I am doing is going into each SP and replace the old name with the new name.
Thank you for any help on this.
Necessity is the mother of all inventions!
I want to determine the performance impact caused by the extensive use of the 'select into #' statement in a production environment. The current situation is that our reports team extensively uses the 'select into #' statement to build smaller subsets of data. These subsets are then used as the basis to create summary style reports and exports. All this is accomplished via the use of SQL pass-through.
After these reports/exports are completed and tested, they are then released to our operations department and the users. The reports/exports then can be run against the production server at the discretion of the user, provided they have the appropriate permissions. These reports/exports target the live data on the primary production server that already has been designated for the use of the application software.
Now I know that reporting against a transactional-based server, where the users run the application, is not a very good idea. (Inherited) I am currently migrating all reports/exports to a reporting server. Although it will still be transaction-based, the reports/exports will be isolated from user activity. Eventually we will be moving toward a warehouse scenario.
I also know that the extensive use of the 'select into #' statement is not a coding practice for use in production. I provided several alternatives to this practice
1) insert..select 2) insert..execute - from stored procedure
I have read that in the in sql 6.5 that this may cause severe performance and locking behaviors in system db's and tempdb. However, in the following document on the Microsoft Knowledge Base, it indicates that SQL 7.0 may have corrected this issue.
Q153441 - FIX SELECT INTO Locking Behavior.htm
Despite the indication of being corrected, I am still not convinced. I am frequently seeing drastic performance hits, especially when several of the reports are running. (which is very common) My concern is that moving these reports/exports to a reporting server may save the users; I believe that it may be migrating the problem to another location. I will be working with the developers to optimize their code and will investigate index issues.
** To make a long story short. I would like someone who has experience with this provide me with the top 5+ reasons not to use the 'select into #' methodology in a production environment. Further, if anyone has any documentation, I would surely like the info.
Thanks, Dave
I want to change the filegroup of a table. While we can do this in enterprise mgr, I would like to accomplish this in transact sql. We have a new configuration where the filegroups are located on different disks and to take advantage of that, I want to move the heavily accessed tables onto different groups. Example: table emp needs to be moved from filegroup Primary to file group Secondary.
please help...
Hi,
Just want to ask that if it is possible to change a table ownership?
thanks
Hi there,
Its probably easier to draw this problem than describe it, so here goes:
I have a sales forecast table (A,B,C are products [PRODUCT], the dates refer to the month for which the forecast is [FORECAST_DATE], and the integer is the forecast sales qty [FORECAST_QTY])
A 01/03/2004 30
B 01/03/2004 28
C 01/03/2004 24
A 01/04/2004 11
B 01/04/2004 09
C 01/04/2004 41
I need to convert the table into a more sensible format, like this:
(NB ...Dots are just there to help with formatting - basically I'm talking about a field for FORECAST_03_2004, FORECAST_04_2004 etc etc)
........ 01/03/2004....01/04/2004
A..........30..................11
B..........28..................09
C..........24..................41
I'm really no t-SQL guru, and I can't seem to get any joy out of BOL. It must only be a tiny bit of code. Can anyone help?
Thanks very much
Sam
Hi- apologies for asking a stupid newbie question, but I'm really stuck atthe moment. I need to change table ownership.I've got an asp script which is looking for a table owned by the dbo role,however the table was created under a different ownership. I understand theproblem, and almost understand the solution, but I can't seem to get all theway.THE PROBLEM (using [server].[database].[owner].[table])[mgbsvr1].[dnn].[dnnadmin].[aspsearch]needs to be[mgbsvr1].[dnn].[dbo].[aspsearch]I looked up the books online and found this syntax:sp_changeobjectowner [ @objname = ] 'object' , [ @newowner = ] 'owner'But I can't see how to use it, nor more importantly, where I should use it.It won't work in the query tool in Enterprise Manager. If I need to create ascript (which I've never done before), how do I execute the script?All help deeply appreciatedManning, Sydney
View 3 Replies View RelatedHi All,I am trying to change column name on an existing table. I am using SQLServer 7.As the table is quite big, it is taking quite long time to do it.By the way I could change the column name only through the EnterprizeManager.Is it possible to change the column name using SQL script?Why the change of column name will depend on the size of the table?Thanks for your answer.-Mokles
View 4 Replies View RelatedHello,
I created a package using the import/export wizard in SSIS, that loads data from one database to the other. I am trying to find out how I can add and remove the tables that were originally selected when the package was created. I opened the package in BIDS, and I could not find that particular option. I know you can do this in 2000/DTS...
Any help would be appreciated...
Thank you,
David
Hi,
Anybody have any idea howmuch % of performance will be affect if we are using varchar instead of char data type?.
Thanks,
Ravi
Hi,
I am looking for a tool that is similar to SQL Impact (Quest). Quest has discontinued the tool.
This tool should be able to detect all database object dependencies for SQL Server, Sybase and Oracle. The objects should include tables, views, stored procedures, indexes and other objects. This should also detect DB object dependencies in front end applications as well.
Any suggestions are greatly appreciated...
Thanks!
I have been collecting information about 20 performance counters (memory, IO, cpu, SQL) that refresh every 15 seconds, would that have any performance hit in the server? what are best practices when collecting information via performance counters?
Thanks
I want to use "on delete cascade" in one of my tables but I'm worried though whether this can affect the performance when having millions of records. To explain more I'm working on a social networking website and I have two tables UserAccounts, in which I only keep the username and password and a few related fields, and Profiles in which I keep the profile data for users, I want to be sure that I won't have any records in the Profiles table without corresponding records in the UserAccounts table. Please see the DDL below to understand more the structure of the tables:
CREATE TABLE UserAccounts
(
UserID INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
UserName VARCHAR(20) NOT NULL,
Password VARCHAR(20) NOT NULL,
--other fields (e.g. last login .. etc)
)
CREATE TABLE Profiles
(
UserID INT NOT NULL REFERENCES UserAccount(UserID),
-- other fields (e.g. birthdate, nationality .. etc)
)
Any suggestions are highly appreciated...
Hi,
Does anyone know how the key influencers impact values are calculated? Thanks!!
Kate
Hi,
I am currently working on with the ASP encryption of my application. I've tried to test the encryption of the connection string using the capicom.dll in my local, and it works successfully. However, I am not quite sure if this will still work after my OS is upgraded to WIN2K3 (my current OS is WINXP). Will this dll component be impacted after the OS Upgrade? or will there be no impact at all?
Any inputs from you guys would be much appreciated.
Thank you.
Thanks to all participants.
I am using SQL Server 2000 with replication object for two location. Log size on publisher go upto 25 times of data file size, I mean 80 MB Data files has maintains 2 GB log file and it is same for all five co's working on same windows 2000 advanced server board.
Since last week server randamly get disconnected from user applications and at that time few tables are not openable at server.
Can any one give a reason ? Why this type misbehaviou done by SQL Server 2000?
Thanks.
I have a question regarding FUll and differential backup.
We we take full or diff back up, does it create lot of logs ie. Does full or diff backup has any impact on log size?
Thanks