When Do I Need To Drop Column Statistics When Doing An Alter?
Aug 30, 2007
I need to know definitively when I need to drop and recreate column statistics (histogram) when altering a column. Empirically, it seems I can lengthen a varchar or change a not null column to a nullable one, and then existing statistics dont' cause
Msg 5074, Level 16, State 1, Line 1
The statistics 'c1' is dependent on column 'c1'.
Msg 4922, Level 16, State 9, Line 1
ALTER TABLE ALTER COLUMN c1 failed because one or more objects access this column.
But, if I change a column to not nullable or shorten a column, I get the error.
Is this the complete description of when I need to drop and recreate column statistics and when I don't?
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Jul 23, 2005
Hello,A script we run against the database as part of the upgrade of our productis failing with the following message:ALTER TABLE ALTER COLUMN EncodedID failed because STATISTICS hind_61_3accesses this columnThe line that fails is:alter table Badge alter column EncodedID nvarchar(16)It's clear that there's some kind of automatically generated statisticsobject referencing the column that prevents us from changing it from anint to an nvarchar. However, I have no idea how that got there - my bestguess would be that it has something to do with the auto generatestatistics option being set on the database. However that seems odd to mebecause we've done lots and lots of work like this and not encountered theproblem. It also seems like a quick fix would be to perform:Drop Statistics Badge.encodedidHowever I am afraid subsequent statements might fail on this db since Iwasn't really expecting this in the first place. Does anyone have anyinsight?Dave
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Dec 29, 2014
My question: Is it okay to drop all the auto generated column statistics? (for the following scenario)
- I am cleaning up unnecessary objects (tables, unused indexes, overlapping statistics etc) from databases and found out there are more than 1400 auto generated column statistics on one database (lets call it A).
- Database A was used to be our reporting database but from last several years we are using database B for reporting. DB A has all the historical data while DB B only has valid records.
- We are updating all the column statistics with full scan nightly on database A and it is talking almost 2.5 hours to do that. Now I want to drop all the "unnecessary" statistics those were created when DB A was reporting database and they are no longer in use. There is no way to know the creation date of the column statistics that I know of. Statistics "last update date" is of no use because of our nightly job. So I was thinking of dropping all the auto generated column statistics and let the sql server create as it needs from now.
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Mar 7, 2008
Hi I’m trying to alter a table and delete a column I get the following error. The object 'DF__Morningst__LastU__19EB91BA' is dependent on column 'LastUpdated'.
ALTER TABLE DROP COLUMN LastUpdated failed because one or more objects access this column. I tried deleting the concerned constraint. But the next time I get the same error with a different constraint name. I want to find out if I can dynamically check the constraint name and delete it and then drop the column. Can anyone help.IF EXISTS(SELECT 1FROM sysobjects,syscolumnsWHERE sysobjects.id = syscolumns.idAND sysobjects.name = TablenameAND syscolumns.name = column name)BEGIN EXECUTE ('ALTER TABLE tablename DROP CONSTRAINT DF__SecurityM__DsegL__08C105B8')EXECUTE ('ALTER TABLE tablenameDrop column columnname)ENDGO
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Apr 18, 2008
Is there any way to remove the IDENTITY property of a column? I originally used it, but it caused so many headaches with ADO.NET that I've decided to just increment the darn things manually. So I want to turn it into just a normal integer column.
If there's no direct way, can someone suggest a quick way to create a new column, copy all the old values into the new column, change the primary key to the new column, and drop the old column?
Thanks.
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Apr 11, 2001
1. We have user defined type (Sql type = bit ) with rule setting it to 0
2. New column(isVIP) was created using this user defined type
3. sp_unbindrule was used to unbind rule from new column (isVIP)
4. Alter table Client drop Column isVIP !!!! (invalid syntax )
Any ideas ?
Thanks
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Sep 7, 2007
Hi guys,
If I have a temporary table called #CTE
With the columns
[Account]
[Name]
[RowID Table Level]
[RowID Data Level]
and I need to change the column type for the columns:
[RowID Table Level]
[RowID Data Level]
to integer, and set the column [RowID Table Level] as Identity (index) starting from 1, incrementing 1 each time.
What will be the right syntax using SQL SERVER 2000?
I am trying to solve the question in the link below:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2093921&SiteID=1
Thanks in advance,
Aldo.
I have tried the code below, but getting syntax error...
ALTER TABLE #CTE
ALTER COLUMN
[RowID Table Level] INT IDENTITY(1,1),
[RowID Data Level] INT;
I have also tried:
ALTER TABLE #CTE
MODIFY
[RowID Table Level] INT IDENTITY(1,1),
[RowID Data Level] INT;
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Jul 21, 2003
How to find out all the statistics from all the tables and drop them..any script anyone can help with?
When we are trying to make datatype changes in few related tables,it's giving error saying that some statistics are dependent onthe column blah blah...
Thanks,
Sheila.
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May 15, 2006
I must change replication schema from:
Publisher - SQL2000(8.0.2039), Disrtibuter/Subscriber - SQL2000
to:
Publisher - SQL2000(8.0.2039)(The same server), Disrtibuter/Subscriber - SQL2005(9.0.2047)(new server)
I have removed all subscription, publications, distributer and publisher. So there should not be now any information about replication.
Now I want to make some changes with tables and i try to alter and drop columns on publisher database. But it wont do... I always receive messages that tables and fields are being used in replication:
ALTER TABLE Clients DROP COLUMN ABCCode
Msg 4932, Level 16, State 1, Line 1
ALTER TABLE DROP COLUMN failed because 'ABCCode' is currently replicated.
I tried to use sp_MSunmarkreplinfo and sp_removedbreplication but it did not help. I also tried to drop column with sp_repldropcolumn but got this message: Invalid object name 'sysmergearticles'.
Looks like server (publisher) still has information about old replication. But how to delete this information? And how can I alter and drop fields?
Thanks
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Jul 23, 2005
Hi people,I?m trying to alter a integer field to a decimal(12,4) field in MSACCESS 2K.Example:table : item_nota_fiscal_forn_setor_publicofield : qtd_mercadoria integer NOT NULLALTER TABLE item_nota_fiscal_forn_setor_publicoALTER COLUMN qtd_mercadoria decimal(12,4) NOT NULLBut, It doesn't work. A sintax error rises.I need to change that field in a Visual Basic aplication, dinamically.How can I do it? How can I create a decimal(12,4) field via script in MSACCESS?Thanks,Euler Almeida--Message posted via http://www.sqlmonster.com
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Nov 5, 2000
I am dropping 60 out of 133 columns on a user table, but am finding that the spaceused by the table ( as shown by sysindexes.dpages ) is not being freed up.
I have dropped and recreated all indexes on the table, with no effect on the dpages value, as well as running dbcc updateusage for the table.
Is it not possible to free up the space used by using this method ?
Is recreating and repopulating the table with only the required columns the correct / only way to do this ?
thanks,
manoj
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Oct 26, 1999
I am writing a procedure to drop a specific user's schema only. I select all his/her table name and foreign key in a temp table first and then use a cursor to get the table name and foreign key, and begin drop foreign keys and drop table. However, sql think it is wrong with the syntax like "alter @table_name". Does anyone have a clue, what is wrong with my syntax. Or someone know how to drop one specific user's schema only (Other user may have same table in the database, and you don't want to drop that.
Attached is my scripts: please correct it. Thanks.
CREATE procedure sp_drop_schema @user sysname
as
select o.name table_names, o.id table_id, s.parent_obj Key_id, s.name key_name, u.name users_name
into #temp1
from sysobjects o inner
join sysobjects s on o.id=s.parent_obj
join sysusers u on o.uid=u.uid
where s.type='f' and u.name=@user
declare cur_f cursor
for select table_names, key_name
declare @table_name varchar (80), @key_name varchar (80)
open cur_f
fetch next from cur_f into @table_name, @key_name
while @@fetch_status=0 begin
alter table @table_name
drop constraint @key_name
fetch next from cur_f into @table_name, @key_name
end
close cur_f
deallocate cur_f
drop table #temp1
select o.name table_name, o.id table_id, o.uid users_id, u.name users_name
into #temp2
from sysobjects o
inner join sysusers u on o.uid=u.uid
where type='u' and u.name=@user
declare cur_temp cursor
for
select table_name
from #temp2
declare @tab_name varchar (80)
open cur_temp
fetch next from cur_temp into @tab_name
while @@fetch_status=0 begin
drop table @tab_name
fetch next from cur_temp into @tab_name
end
close cur_temp
deallocate cur_temp
drop table #temp2
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Nov 8, 2006
Thought I should post in the newbie forum for a while, instead. :-)
I have a couple of scripts that I've generated that drop a couple of system stored procedures and recreate them. I'm not sure why I did it in the first place, but I think it was that it wouldn't let me run an ALTER statement on them. Specifically, I'm now looking at sp_add_operator. I changed it to a 500 character email field instead of whatever it was (100, I think.)
/* Explanation: Why did I do that? SQL Mail is prohibited here, so I'm using CDO_Sysmail to email myself and the developers if a job fails. The list of people to email is determined by the owner of the database, who is also an operator in SQL. I get the list of emails from the email field of the operator properties. Hence, I need a bigger email field. Yes, I now know it would most likely be better to create an ADMIN database on each server for this kind of stuff. (Thanks to Tara for that blogged suggestion.) */
While I will probably go back to the default stored procedure, this got me to thinking: when would it be better to use an ALTER statement on a SProc rather than to do a DROP and CREATE?
Your thoughts, oh SQL gurus?
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Jun 12, 2003
I need to run the alter table to drop a default. However, the default name is kind of 'dynamic' from around 1000 databases, thus I need to run the following sql to get the name to a variable. Now, it looks the alter table statement does not like to drop a vaiable, is there a solution about it?
declare @radius_default varchar(40)
select @radius_default = (select sobj.name from sysobjects sobj
inner join syscolumns scolumn
on sobj.ID = scolumn.cdefault
where scolumn.name = 'radius' and sobj.name like '%LandMarks%')
print 'Need To Drop @radius_default: ' + @radius_default
--====================================
alter table LandMarks drop constraint @radius_default
thanks
David
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May 11, 2005
Hi:
I need to change a column's datatype from tinyint to int as follows:
alter table tableName
alter column column1 int
but with error <<'DF__LandMarks__color__6A50C1DA' is depending on it.>>
However, this old default is not part of the constraint. Thus, the only way is to delete it from sysobjects.
unfortunately, the following code I have to commented since they could only be executed line by line, not within a begin...end block.
--exec master.dbo.sp_configure 'allow updates', 1
--reconfigure with override
--delete from sysobjects
-- where name = 'DF__LandMarks__color__6A50C1DA'
-- and type = 'D'
--exec master.dbo.sp_configure 'allow updates', 0
--reconfigure with override
I need to update 10 server around 2500 databases with this change.
I have looked INFORMATION_SCHEMA related views, but not found default related, maybe I missed something.
thanks
David
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Mar 20, 2015
I have a VIEW which is dynamically generated through complex dynamic SQL. Unfortunately the dynamic SQL uses "Select * from table" to select the columns because the programmer did that to reduce the amount of code in the dynamic SQL string as the code can't be debugged if it's too long.
Therefore, I have a VIEW with columns in it I don't need, and want to remove them from the view - I need to remove all columns with column names matching the syntax '%1%_2' .
The view is called TEMP_EXPORT_1
I can either use the code below to return a list of columns that I want removed:
select column_name from information_schema.columns
where table_name='TEMP_EXPORT_1' and column_name like '%1%_2'
Or I can use the code below to return the list of columns that I want to keep:
select column_name from information_schema.columns
where table_name='TEMP_EXPORT_1' and column_name not like '%1%_2'
Now how would I go about altering TEMP_EXPORT_1 view so that it no longer has these columns? I know views don't have a drop statement...
Therefore I tried the following but I'm not sure of the syntax:
ALTER VIEW dbo.TEMP_EXPORT_1
AS
SELECT (select column_name from information_schema.columns
where table_name='TEMP_EXPORT_1' and column_name not like '%1%_2')
FROM dbo.TEMP_EXPORT_1
Am I on the right track? how can I ALTER this view to remove these columns? ... I want to keep this separate from the code that generated the view as I want it as an optional procedure that can be run if needed.
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May 17, 2007
Anyone have any compelling arguements for using one over the other?
Thanks
Mercy
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Aug 19, 2015
We have a generic sql login "prduser". Applications use this login. We want the login NOT to have ALTER PROCEDURE and DROP PROCEDURE permissions only on the stored procedures(there are thousands of them).
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Jul 20, 2005
I would like to add an Identity to an existing column in a table using astored procedure then add records to the table and then remove the identityafter the records have been added or something similar.here is a rough idea of what the stored procedure should do. (I do not knowthe syntax to accomplish this can anyone help or explain this?Thanks much,CBLCREATE proc dbo.pts_ImportJobsas/* add identity to [BarCode Part#] */alter table dbo.ItemTestalter column [BarCode Part#] [int] IDENTITY(1, 1) NOT NULL/* add records from text file here *//* remove identity from BarCode Part#] */alter table dbo.ItemTestalter column [BarCode Part#] [int] NOT NULLreturnGOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS ONGOhere is the original tableCREATE TABLE [ItemTest] ([BarCode Part#] [int] NOT NULL ,[File Number] [nvarchar] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_File Number] DEFAULT (''),[Item Number] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Item Number] DEFAULT (''),[Description] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Description] DEFAULT (''),[Room Number] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Room Number] DEFAULT (''),[Quantity] [int] NULL CONSTRAINT [DF_ItemTest_Quantity] DEFAULT (0),[Label Printed Cnt] [int] NULL CONSTRAINT [DF_ItemTest_Label Printed Cnt]DEFAULT (0),[Rework] [bit] NULL CONSTRAINT [DF_ItemTest_Rework] DEFAULT (0),[Rework Cnt] [int] NULL CONSTRAINT [DF_ItemTest_Rework Cnt] DEFAULT (0),[Assembly Scan Cnt] [int] NULL CONSTRAINT [DF_ItemTest_Assembly Scan Cnt]DEFAULT (0),[BarCode Crate#] [int] NULL CONSTRAINT [DF_ItemTest_BarCode Crate#] DEFAULT(0),[Assembly Group#] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Assembly Group#] DEFAULT (''),[Assembly Name] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Assembly Name] DEFAULT (''),[Import Date] [datetime] NULL CONSTRAINT [DF_ItemTest_Import Date] DEFAULT(getdate()),CONSTRAINT [IX_ItemTest] UNIQUE NONCLUSTERED([BarCode Part#]) ON [PRIMARY]) ON [PRIMARY]GO
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Oct 8, 2007
I am using sql server ce.I am changing my tables sometimes.how to use 'alter table alter column...'.for example:I have table 'customers', I delete column 'name' and add column 'age'.Now I drop Table 'customers' and create again.but I read something about 'alter table alter column...'.I use thi command but not work.I thing syntax not true,that I use..plaese help me?
my code:
Alter table customers alter column age
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Oct 29, 2001
I ran this query against the pubs database and it runs successfully
ALTER TABLE publishers ALTER COLUMN state CHAR(25)
I change the table & field names for my db as follows:
ALTER TABLE customquery ALTER COLUMN toclause CHAR(25)
and run against my database and I get the following error - Incorrect syntax near 'COLUMN'.
My column name is correct - I don't know why it would run fine against pubs, but not my db. I do not have quoted identifiers turned on. I have tried using [] around my column name [toclause], but that didn't change anything. Any help would be appreciated.
Thanks.
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Dec 18, 2012
I have a server which is not running optimally and I checked the default trace. I have around 600 entries in the default trace which are all Missing Column Statistics and the database is tempdb.is_auto_create_stats_on and is_auto_update_stats_on are both 1 for tempdb.
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Jul 23, 2014
Getting events in the default trace saying missing column statistics on a column...
1.The column is the primary key column ( identity )
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Aug 3, 2006
i have a table
table1
column1 int not null
column2 char not nul
column3 char
i want to script a change for table1 to alter column1 to be the table identity column. not primary.
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Jul 23, 2005
I have a table with a column defined thus: LOCNumber Varchar(100) in atable called Bookdata.If I execute ALTER TABLE BookData ALTER COLUMN LOCNumber varchar(100)on the table, does any work get done on the table and column?Or does SqlServer know that the column is already varchar(100) andnothingneeds to be done?If it does do some work, how do you tell it not to run this as it isalready a varchar(100) column. Right now my program just blindly doesthis ALTER TABLEstatement regardless of any conditions. Is this a potential problem?Thanks for any help.
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Jul 20, 2005
Hello group.I have an issue, which has bothered me for a while now:I'm wondering why the column statistics, which SQL Server wants me tocreate, if I turn off auto-created statistics, are so important to theoptimizer?Example: from Northwind (with auto create stats off), I do the following:SELECT * FROM Customers WHERE Country = 'Sweden'My query plan show a clustered index scan, which is expected - no indexexists for Country. BUT, the query plan also shows, that the optimizer ismissing a statistic on Country, which tells me, that the optimizer wouldbenefit from knowing this.I cannot see why? (and I've been trying for a while now).If I create the missing statistics, nothing happens in the query plan (andwhy should it?). I could understand it, if the optimizer suggested an indexon Country - this would make sense, but if creating the missing index, queryanalyzer creates the statistics with an empty index, which seems to me to beless than usable.I've been thinking long and hard about this, but haven't been able to reacha conclusion :) It has some relevance to my work, because allowing theoptimizer to create missing statistics limits my options for designingindexes (e.g. covering) for some rather wide tables, so I'm thinking why notturn it off altogether. But I would like to know the consequences - hopesomebody has already delved into this, and knows a good explanation.RgdsJesper
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Aug 1, 2006
What is the unit of the numbers you get in the Time Statistics-part when running a query in Microsoft SQL Server Management Studio with Client Statistics turned on?
Currently I get mostly 0´s, but if I try and *** up a query on purpose I can get
it up to around 30... Is it milliseconds or som made up number based on clockcycles or... ?
I would also like to know if it´s possible to change the precision.
- Nikolaj
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Jul 11, 2007
When you use "Alter Table add Column", it adds the column to the end of the list of fields.
How do you insert the new column to position number 2 for instance given that you may have more than 2 columns?
Create table T1 ( a varchar(20), b varchar(20), c varchar(20))
Alter table add column x varchar(20)
so that the resulting table is
T1 a varchar(20), x varchar(20), b varchar(20), c varchar(20)
Can this be done programmatically?
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Jun 14, 2006
if i have structure of table like a,b,c,d,e column then
i want to alter one more column x b/w b and c column, so that
a,b,x,c,d,e
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May 16, 2006
Well here's one of those excruciatingly simple obstacles:
In SQL Server 2005 (Mgmt Studio): according to BOL, the syntax to set a default value for an existing column is:
ALTER TABLE MyCustomers ALTER COLUMN CompanyName SET DEFAULT 'A. Datum Corporation'
However, when I Check:
alter table CommissionPayment alter column Amount Set Default 0
I get the error message:
"Incorrect syntax near the keyword 'Set'."
No other combinations of this syntax work.
Help! What am I missing?
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Jul 15, 2002
Hi smart people!
I would like to know how to alter a column to have a default value. For instance I have a column AreaCode Char(3) in a table. I have data in the table and now I want to add a default value of '123' to the AreaCode column.
I tried the following but did not work.
Alter Table Phone
Alter Column AreaCode Char(3) Default '123'
Can we even do it using SQL?
Thanks
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Jul 12, 2001
Is there any way to alter a column's name using Transact SQL and not the GUI interface?
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Mar 15, 2006
what is the syntax for multiple column modifications ?
alter table abc
alter column x1 nvarchar(10) null
-- works
alter table abc
alter column x1 nvarchar(10) null,
alter column x2 nvarchar(10) null
-- doesn't work or do i have to use the alter table each time ?
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