Estimate Log Space For Alter Table Statement
Jan 31, 2007
My client's website database is hosted by a third party. I need to alter one of the column definitions for the largest table in the database. Unfortunately, the transaction log fills up if I try to alter the table. I've done all the usual stuff like truncating the log, etc., but the simple fact is that the operation requires more log space than we have available. Therefore, we need to purchase additional disk space for the database.
What I'm looking for is a way to roughly estimate how much log space will be required to alter this table so that we purchase enough but not too much additional space. The table has an identity primary key and 4 other single column indexes: one int, one datetime and two varchar(30) columns.
Any suggestions? Thanks in advance.
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Apr 22, 2015
What is the best way to forecastestimate space for non-clustered index on a table?
Example :
Table name : Test123
Row : 170000000
Reserved : 18000000 KB
Data : 70000000 KB
Index: 40000000 KB
Note: Test123 already has clustered index and 2 non clustered indexes.
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Oct 27, 2015
I want to alter my all tables to change the name of all columns.
I need this because all column names were created with space and I want to remove the space for future work .
For example – In Table Customer there is a column name [Cust_Id ] and I want to change it with [Cust_Id]
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Oct 13, 2000
Hi List,
I am trying to add a column with Alter Table, like this:
ALTER TABLE myTable ADD
newColumn bit DEFAULT 0 NOT NULL
This works fine with SQL-server 7, but I get this error in 6.5:
'ALTER TABLE only allows columns to be added which can contain nulls. Column 'newColumn' cannot be added to table 'myTable' because it does not allow nulls.'
I also found this in the help files:
'Columns added to a table must be defined as NULL. When a column is added, the initial value for the column will be set to NULL. This restriction forces the ALTER TABLE statement to fail if the bit or timestamp datatypes are used.'
My question, is there any other way to do this on 6.5 ?
Stefan Nilsson
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Oct 16, 2014
How SQL calculates the estimated row count when < or > are used in the WHERE clause of a statement. For example:-
WHERE Created_Datetime_utc > CONVERT(DATETIME,'2014-10-14 10:00:00',102)
I know how the estimated number of rows are calculated when an = is used but I've been googling and cannot find anything about < and >.
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Mar 27, 2001
Folks!
What is wrong with my syntax with the following command?:
alter table EmployeeInfo alter column OriginDate smalldatetime not null default getdate()
I'm getting:
Incorrect syntax near the keyword 'default'
Currently, in my table OriginDate is nullable with no default.
Thanks in advance for your help!
APF
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Feb 14, 2000
Hello all,
I am trying to add columns to several tables in a singular database. I want to check to see if the column exists in a given table first before executing the alter table command so that I can skip that command if the column already exists, and avoid aborting my script prematurely. I can't seem to find a way to check for the column's existance. Any suggestions?
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Sep 3, 2007
Hello,how can I estimate the size (KB) of a temptable?Thank Yousilas
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Feb 4, 2015
I have a table like below,
CREATE TABLE Student
(
Id BIGINT not null
,Name NCHAR(20) not Null
,Branch NVARCHAR (64) null
)
The table contains : 100000 rows .
Getting details of below
1)Number of rows in a data page
2)Total number of pages required for the table
3)Total Table size in KB or MB
4)Total file size in Kb or MB
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Feb 4, 2015
I have a table like below,
CREATE TABLE Student
(
Id BIGINT not null
,Name NCHAR(20) not Null
,Branch NVARCHAR (64) null
)
The table contains : 100000 rows .
1)Number of rows in a data page
2)Total number of pages required for the table
3)Total Table size in KB or MB
4)Total file size in Kb or MB
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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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Jan 31, 2005
i need to full-text index a table so that i can easily search the text fields of that table.. the table has about 21,000 rows, and i was wondering how long it might take to full-text index it?
thanks
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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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May 15, 2000
Do anyone knows the syntax for changing the name of a column in a table with the
alter statement or any other statements????
Thanks in advance,
Vic
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Jan 5, 2001
Hi
Is it possible to remove Identity property of a column using ALTER statement in SQL Server 7.0.
Thanks in advance
Rahul
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Jul 3, 2000
looking for necessary syntax to alter table id to autoincrement adding identity statement, not sure on syntax for seed an increment, or if it is possible at all.
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Jul 19, 2006
Here is the alter statement that I am trying to use to create a relationship between 2 tables. This does not seem to work on mobile. What am I doing wrong?
ALTER TABLE [SubCategory] CONSTRAINT [FK_SubCategory_Category] FOREIGN KEY([CategoryID])
REFERENCES [Category] ([CategoryID])
ON UPDATE CASCADE
ON DELETE CASCADE
This is the error:
There was an error parsing the query. [ Token line number = 1,Token line offset = 27,Token in error = CONSTRAINT ]
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May 28, 2002
Hello.
I'm trying to create a batch sql script which first alters some existing tables via the ALTER TABLE command, I then want to alter some existing stored procedures via the ALTER PROCEDURE command within the same batch. I have found that I can encompas the alter table scripts within a conditional IF EXISTS (Begin/End) but not the alter procesdure scripts. I have looked in reference material and have found nothing to suggest this type of operation is not possible. Is this possible? Is this a know bug fixed by a service pack?
Thanks in advance for any replies.
David.
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Feb 6, 2008
Hi
I want to delete the Default value for a specific column which is set to Null
I've used
ALTER TABLE SYSTEMS_PATIENT_LOG ALTER COLUMN SYSTEMS_LOGID DROP DEFAULT
It is giving error
Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'DEFAULT'.
plz could any one tell me where I could be wrong
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May 14, 2002
I have coded an alter statement for adding a column to a temp table inside an sp,but it skips the alter statement while executing the sp! This happens even if I run the same code on query analyzer too. If I use 'GO' statement before the alter command,then it works fine on Query Analyzer.But, I can't use 'GO' in an sp. I am using the sa account. Any ideas on how to fix this??
Thanks.
Di.
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May 5, 2008
It is possible to alter multiple columns within a single alter table statement?
I have got the following URL that tells it is not possible to alter multiple columns within in signle alert table statement.
http://www.blogcoward.com/archive/2005/05/09/234.aspx[^]
Does anyone know about that?
Thanks,
Mushq
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Apr 20, 2015
Im working on Partition purge process, where I need to specify following statement:
SET @cmd = 'ALTER PARTITION FUNCTION ' + @function_name + '() MERGE RANGE (@range)'
EXEC (@cmd);
SET @cmd1 = 'ALTER DATABASE '+ db_name()+ ' REMOVE FILE ' + @partition_file
EXEC (cmd1);
I want to put this statement in Begin Tran /Commit statement but getting error that it is not allowed. "ALTER DATABASE statement not allowed within multi-statement transaction"..what are my options to rollback in case there is a failure.
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May 7, 2015
I have written the following code:
SET NOCOUNT ON
DECLARE @RowCount int; SET @RowCount = 0;
Begin Try
Begin Transaction
--------------------------------------------------------
-----Table Name: AlertsStaticRecord_Archive
-----Column Name: AlertID
--------------------------------------------------------
ALTER TABLE [AlertsStaticRecord_Archive] ALTER COLUMN [AlertID] int NOT NULL;
[Code] .....
But, when I execute these batch, I am getting error:
Msg 8111, Level 16, State 1, Line 11
Cannot define PRIMARY KEY constraint on nullable column in table 'AlertsStaticRecord_Archive'.
Msg 1750, Level 16, State 0, Line 11
Could not create constraint. See previous errors.
Because, the first ALTER statement is not getting executed.
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Feb 26, 2008
Recently I created a DDL Server-scope trigger using the following:
create trigger stop_alter_database on all server
for ALTER_DATABASE
as
rollback;
print 'database change stopped by stop_alter_database';
go
Then I ran the following script:
alter database [test] modify file (name=test', maxsize=2028mb);
The result was:
Msg 3609, Level 16, State 2, Line 1
The transaction ended in the trigger. The batch has been aborted.
database change stopped by stop_alter_database
The problem is that when I checked the max size of the data file it had changed. So, the statement was never rolled back. Is there something I'm missing because I can't find any documentation or articles that state the inability to rollback alter database statements. Whats going on?
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Jul 18, 2006
Here is the alter statement that I am trying to use to create a relationship between 2 tables. This does not seem to work on mobile. What am I doing wrong?
ALTER TABLE [SubCategory] CONSTRAINT [FK_SubCategory_Category] FOREIGN KEY([CategoryID])
REFERENCES [Category] ([CategoryID])
ON UPDATE CASCADE
ON DELETE CASCADE
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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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Oct 8, 2015
I've some huge table (over 100GB each), these table contain column of NTEXT, IMAGE. Application team needs to change these data types to VARBINARY(MAX), I've tested the modification in our lab and I noticed that the operation has been almost immediate so, I think that DB Engnine has not converted the existing data in the column but it has simply changed the definition of the column.
Or maybe NTEXT and IMAGE can be transparently converted into VARBINARY(MAX)?
Anyway, I want to be sure that the modified table is "coherent" I don't want that at a given point SQL Server tells me that some data is not readable.
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Nov 9, 2015
Primary platofrm: Sql12k, 7.0 Ultimate Pro OS
I'm launching the aforementioned statement from one MASTER session windows and I get this message, I am stuck, I though ROLLBACK INMEDIATE go throught any already session open.
Msg 5064, Level 16, State 1, Line 1
Changes to the state or options of database 'GFSYSTEM' cannot be made at this time. The database is in single-user mode, and a user is currently connected to it.
Msg 5069, Level 16, State 1, Line 1
ALTER DATABASE statement failed.
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Nov 20, 2013
I have created a table as below mentioned. Then I want to alter the ID column as identity(1,1) without dropping the table as well as losing the data.
create table dbo.IdentityTest
(
id int not null,
descript varchar(255) null,
T_date datetime not null
)
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Oct 25, 2015
we have a table in our ERP database and we copy data from this table into another "stage" table on a nightly basis. is there a way to dynamically alter the schema of the stage table when the source table's structure is changed? in other words, if a new column is added to the source table, i would like to add the column to the stage table during the nightly refresh.
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Jul 26, 2004
I have contract table which has built in foreign key constrains. How can I alter this table for delete/ update cascade without recreating the table so whenever studentId/ contactId is modified, the change is effected to the contract table.
Thanks
************************************************** ******
Contract table DDL is
create table contract(
contractNum int identity(1,1) primary key,
contractDate smalldatetime not null,
tuition money not null,
studentId char(4) not null foreign key references student (studentId),
contactId int not null foreign key references contact (contactId)
);
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Aug 13, 2006
In SQL Server 2005,here are two tables, created by the following SQL Statements:
CREATE TABLE student(
ID CHAR(6) PRIMARY KEY,
NAME VARCHAR(10),
AGE INT
);
CREATE TABLE score(
ID CHAR(6) PRIMARY KEY,
SCORE INT,
FOREIGN KEY(ID) REFERENCES student(ID)
);
For the length of Column ID is not enough, So I want to alter its length.The alter statement is:
ALTER TABLE student ALTER COLUMN ID CHAR(20)
For the table student is referenced by table score, the alter statement can not alter the column of the table student, and the SQL Server DBMS give the errors.
But, I can manually alter the length of the column ID in SQL SERVER Management Studio. How to alter column length of the master table(student) along with the slave table(score)?
Thanks!
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