Transact SQL :: Adding A Column To A Large (100 Million Rows) Table With Default Constraint?
Apr 24, 2013
IF NOT EXISTS (SELECT TOP 1 1 FROM dbo.syscolumns WHERE id = OBJECT_ID(N'dbo.Employee) and name = 'DoNotCall')
BEGIN
ALTER TABLE [dbo].[Employee] ADD [DoNotCall] bit not null Constraint DoNot_Call_Default DEFAULT 0
IF ( @@ERROR <> 0 )
GOTO QuitWithRollback
END
It just takes a LOT of time in SQL Server Management studio. I have to cancel the query and cancelling takes a whole lot time. I am using SQL Server 2008.
View 4 Replies
ADVERTISEMENT
Aug 30, 2007
I have a row that is being used log track plays on our website.
Here's the table:
CREATE TABLE [dbo].[Music_BandTrackPlays](
[ListenDate] [datetime] NOT NULL DEFAULT (getdate()),
[TrackId] [int] NOT NULL,
[IPAddress] [varchar](20)
) ON [PRIMARY]
There's a CLUSTERED INDEX on ListenDate ASC and a NON CLUSTERED INDEX on the TrackId.
I have a TRIGGER on the Music_BandTrackPlays table that looks like the following:
CREATE TRIGGER [trig_Increment_Music_BandTrackPlays_PlayCount]
ON [dbo].[Music_BandTrackPlays] AFTER INSERT
AS
UPDATE
Music_BandTracks
SET
Music_BandTracks.PlayCount = Music_BandTracks.PlayCount + TP.PlayCount
FROM
(SELECT TrackId, COUNT(*) AS PlayCount
FROM inserted
GROUP BY TrackId) AS TP
WHERE
Music_BandTracks.TrackId = TP.TrackId
When a simple INSERT statement is done on the Music_BandTrackPlays table, it can take quite a long time. When I remove the TRIGGER the INSERTs are immediate. The Execution plan for the TRIGGER shows that a 'Inserted Scan' is taking up most of the resources.
How exactly is the pseudo 'inserted' table formed?
For now, I think the easiest thing to do is update my logging page so it performs 2 queries. One to UPDATE the Music_BandTracks table and increment the counter, and perform the INSERT into the Music_BandTrackPlays table seperately.
I'm ok with that solution but I would really like to understand why the TRIGGER is taking so long. The 'inserted' pseudo table will be 1 row 99% of the time. Does SQL Server perform a table scan on all 20 million rows in order to determine what's new and put it in the inserted pseudo table?
Thanks!
View 6 Replies
View Related
Mar 9, 2000
I cannot figure out how to add a default constraint to an existing column. The syntax I'm using is :
ALTER TABLE table_name WITH NOCHECK
ADD CONSTRAINT column_name DEFAULT (0)
This gives me a syntax error.
The column was originally added with a default constraint of 1 to a 2.6 million row table.
I dropped the existing constraint and need to add the new default constraint of 0 for that column.
Anyone have any ideas? Thanks in advance.
View 2 Replies
View Related
Jul 11, 2013
We have a table with 16 Million records, and also this table is replicated.
We want to add a new column in to this table for some reason?
View 1 Replies
View Related
May 5, 2015
I have a table named [New Item] and created a default constraint on a column, and i wanted to change the data type of the column using the query
alter table [new item]
alter column pcs_qty decimal(15,2) not null
but the name of the default constraint is 'DF__New Item__Pcs_Qt__2D12A970' and i am not able to delete the constraint because it contains a space in between.Is there any work around for this.
I tried to delete the constraint by using the query
alter table [new item]
drop constraint 'DF__New Item__Pcs_Qt__2D12A970'
but I am getting the exception,
Msg 102, Level 15, State 1, Line 2
Incorrect syntax near 'DF__New Item__Pcs_Qt__2D12A970'.
View 2 Replies
View Related
Sep 17, 2015
I have been tasked with writing an update query to update a table with more than 150 million rows of data. Here are the table structures:
Source Tables :
OC
CREATE TABLE [dbo].[OC](
[OC] [nvarchar](255) NULL,
[DATE DEBUT] [date] NULL,
[DATE FIN] [date] NULL,
[Code Article] [nvarchar](255) NULL,
[INSERTION] [nvarchar](255) NULL,
[Code] ....
The update requirement is as follows:
DECLARE @Counter INT=0 --This causes the @@rowcount to be > 0
while @@rowcount>0
BEGIN
SET rowcount 10000
update r
set Comp=t.Comp
[Code] ....
The update took more than 48h and didn't terminate , how to accelerate it ?
View 6 Replies
View Related
Feb 27, 2008
I'm looking for some performance assistance on updating a column value in a table that contains approximately 50 million rows. I have a permanent table in another database that has the key column and value to be set. My query is listed below, but I'm afraid it will run quite awhile. Any suggestions would be appreciated.
update mytable
set column2 = b.column2
from mytable as a
join mytable1 as b
on a.column1 = b.column1
There is a one to one relationship between the two tables.
View 8 Replies
View Related
May 12, 2015
I am using SQL SERVER 2008R2, not Denali, so I cannot use OFFSET FETCH Clause.
In my stored procedure, I am doing a SELECT INTO #tblTemp FROM... Working fine. This resultset is going to be used in an SSIS package which will generate a pipe-delimited .txt file... Working fine.
For recoverability sake, I am trying to throttle back on the commit chunks to 1000 rows per commit until there are no more rows. I am trying to avoid large rollbacks.
Q: Am I supposed to handle the transactions (begin/commit/rollback/end trans) when the records are being inserted into the temp table? Or when they are being selected form the temp table?
Q: Or can I handle this in my SSIS package for a flat file destination? I don't see option for a flat file destination like I do for an OLE DB Destination (like Rows per batch, Maximum insert commit size).
View 6 Replies
View Related
Oct 26, 2005
Hi guys,
I have this problem. I want to add a new primary key to a table but i want the name of the contstraint to be generated by the system. I have this TSQL code.
ALTER TABLE TableTest
ADD CONSTRAINT PRIMARY KEY (C1)
Reading the BOL, it says that if you don't supply a name for the constraint it generates one. But I get this error "Incorrect syntax near the keyword 'PRIMARY'".
If I add a name to the constraint, it works fine.
I'm using SQL Server 2000
Thanks
Darkneon
View 7 Replies
View Related
Dec 24, 2007
Hey Guys
i need to add a datetime column to an exisitng table that has like 1.2 million records and its being accessed frequently
but i cant afford to stop the db at all
whenever i do : alter table mytable add Updated_date datetime
it just takes too long and i have to stop executing the query after a couple of mins
I am running sql express 2005 sp2. db size is over 3 gb but still under the 4 gb limit
can u plz advice on how to add this column. its urgent!!
thanks in advance
View 5 Replies
View Related
May 27, 2015
ALTER TABLE [dbo].[bkrm_lendcoll] ADD CONSTRAINT
ReqdCovgAmt_constraint33 CHECK
( case
when CovgAmt = 0 and ReqdCovgAmt = 0 then 1
when CovgAmt = 0 and ReqdCovgAmt = 1 then 1
when CovgAmt = 1 and ReqdCovgAmt = 0 then 1
when CovgAmt = 1 and ReqdCovgAmt = 1 then 0
end =1
)
This is my first attempt to add a constraint for business logic. The desired behavior is that the two columns together have the same behavior as a radio button. (one can be true, the other true, both can be false, but both cannot be true.) I get this error when I attempt to update it.
The ALTER TABLE statement conflicted with the CHECK constraint "ReqdCovgAmt_constraint33". The conflict occurred in database "Std", table "dbo.lendcoll".
So, basically my question is, when you have two bit columns and want them to have the truth table such as described, how can I set a Check constraint to enforce this?
View 14 Replies
View Related
Jul 21, 2015
I am trying to update a large table which consists of 45 million records , it is taking more than 2 days to the update , below is my approach
1. The table has only one clustered index and no other indexes on the table.
2. I am updating in batches say 20000 record-wise.
3. Changed the recovery mode to bulk logged and auto-growth size is set to 300MB and there is enough space in my disk for transaction log .
But still the query is running slowly.
View 10 Replies
View Related
Oct 1, 2007
Hello!
I am trying to alter a table adding a column with foreignkey constraint. The table that holds the primary key in that relation has data, so i am not being able to execute the alter statement.
This is the error:
Server: Msg 547, Level 16, State 1, Line 1
ALTER TABLE statement conflicted with COLUMN FOREIGN KEY constraint 'FK_MOPAeroportoICAO_IDMOPAlimentacaoFerroviaTipo'. The conflict occurred in database 'MOP', table 'MOPAlimentacaoFerroviaTipo', column 'IDMOPAlimentacaoFerroviaTipo'.
This is the script:
ALTER TABLE MOPAeroportoICAO
ADD IDMOPAlimentacaoFerroviaTipo [int] DEFAULT 0 NOT NULL
CONSTRAINT [FK_MOPAeroportoICAO_IDMOPAlimentacaoFerroviaTipo] FOREIGN KEY
REFERENCES MOPAlimentacaoFerroviaTipo (IDMOPAlimentacaoFerroviaTipo)
How can i turn of check when i add the foreign key ?
Thanks in advance
View 1 Replies
View Related
Dec 7, 2001
I can't seem to get the syntax correct for ALTERing an existing column with a default constraint. I've been to Help and BOL. There are examples that show how to use the ALTER command to add a column with a default constraint but not how to do it on an existing column.
Any help would be appreciated.
Sidney Ives
View 1 Replies
View Related
Mar 16, 2004
I need to alter the datatype of a column from smallint to decimal (14,2) but the column was originally created with the following:
alter my_table
add col_1 smallintNot Null
constraint df_my_table__col_1 default 0
go
I want to keep the default constraint, but i get errors when I try to do the following to alter the datatype:
alter table my_table
alter column col_1 decimal(14,2)Not Null
go
Do I need to drop the constraint before I alter the column and then rebuild the constraint? An example would be helpful.
Thx
View 1 Replies
View Related
Jul 29, 2014
I am doing a performance testing for In-memory option is sql server 2014. As a part I want to insert 500 million rows of records into a in-memory enabled test table I have created.
I need a sample script to insert 500 million records into a table ....
View 9 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 based
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
Jun 12, 2015
I have a requirement to delete 1 Million records from a table having 10 Million data and it's being queried on 24/7 basis (don't have a downtime). how can I achieve that?
View 13 Replies
View Related
Sep 16, 2015
Select MemberNbr, EligYear,EligMonth, count(*) FROM [MemberMonth]
GROUP BY MemberNbr, EligYear,EligMonth HAVING COUNT(*) > 1
THIS WILL GIVE ME ZERO ROWS,,, That is GOOD which means NO DUPLICATES..I need to add a constraint to the table MEMBERMONTH to make sure no one can insert duplicate records.
MemberNbr VARCHAR,
EligYear INT ,
EligMonth INT
View 1 Replies
View Related
Jun 12, 2007
I have a default constratint on DateColumn getdate()-1
I have used enterprise manager to update it to yesterday's date everyday.
I would like to have a SQL which can check for the date in the system
or even a trigger which checks when the date changes the constraint is updated itself. If this is not possible I would like to have a stored procedure which I will schedule to run as a job everyday once.
So if today 6/12/2006, the default value in the Datecolumn should be
6/11/2006.
This gives me a error, i tried but could not fix the bug.
Alter Table TABLE_NAME
Alter Constraint DF_DATECOLUMN
Default getdate()-1
Ashley Rhodes
View 4 Replies
View Related
Jul 5, 2004
Hi Can anybody help me.
I have this querey at the minute but when I attempt to put the default value of IND in the Sales Rep Code field I get an error Invalid column name, if I try and put 'IND' AS [Sales Rep Code] I get an incorrect syntax error.
DECLARE @Query nVarchar(1000)
SET @Query = N'SELECT NULL AS [GEO UNIT], NULL AS [PMC Invoice Date], IND AS [Sales Rep Code] FROM '+ 'Test' + RIGHT(DATEPART(yy, GETDATE()), 2) + '_' + CASE WHEN DATEPART(m, GETDATE()) IN ('11', '12', '1')
THEN 'Q1' ELSE CASE WHEN DATEPART(m, GETDATE()) IN ('2', '3', '4') THEN 'Q2' ELSE CASE WHEN DATEPART(m, GETDATE()) IN ('5', '6', '7')
THEN 'Q3' ELSE CASE WHEN DATEPART(m, GETDATE()) IN ('8', '9', '10') THEN 'Q4' END END END END + '.dbo.all_data' EXECUTE sp_executesql @Query, N'@level tinyint', @level = 35
Can anybody please help on this.
Thanks
View 4 Replies
View Related
Jun 25, 2015
I have questions and answers from one table, I need to select questions as column names and answers column values as the results for the questions column.
View 28 Replies
View Related
Aug 11, 2014
I need to use Bulk insert statement for copying a table with 200 million rows to another table on the same server...the table has no primary key or identity column.... script for BULK INSERT ...
View 9 Replies
View Related
May 25, 2004
I'm new to SQL server and am in the process of converting an Access Db to SQL.
What I'd like to happen is for the current date and an Autonumber generated as soon as the user enters a value in another field. This was fairly straightforward in Access. When I try to set the default in design table (inSQL), the date() is not available. After a little research I came up with CREATE DEFAULT and Bind column commands, Global variables, etc.
I have a couple of questions for anyone that might know:
Is there an easier way than this to create default values in a table? AND,
Would I also have to bind columns for Table lookups? For example, if I wanted a price to be returned after the product ID was entered (Automatic in Access if relationship/form setup properly), would I have to bind the column? Or would it happen automatically?
View 1 Replies
View Related
Aug 31, 2015
So my data column [EODPosting].[MatchDate] is defined as a DATE column. I am trying to SELECT from my table where [EODPosting].[MatchDate] is today's date.
SELECT*
FROM[dbo].[EODPosting]
WHERE[EODPosting].[MatchDate]=GETDATE()
Is this not working because GETDATE() is like a timestamp format? How can I get this to work to return those rows where [EODPosting].[MatchDate] is equal to today's date?
View 2 Replies
View Related
May 19, 2015
I have a subquery i wanted to add a as a fourth column to my Original Query(is the one below the subquery). How to combine the two queries to one statement?? I tried but was getting an error "Subquery returned more than 1 value "
select
COUNT(*)FreeReduced
from students s join Buildings b on
s.Building_ID = b.Building_ID
where s.Activeness =1 and (Eligibility = 3 or Eligibility =2)
group by building_number,Building_Name
[Code] ....
View 3 Replies
View Related
Sep 19, 2015
There is a table exists in a database name tbDatabaseProviders.
I want to alter this table to add a column DatabaseProvider Also I want to add a default constraint so if nothing than 1 should be added.
Remember, the table already exists so when I write the script query then I want to first check the constraint if it exists then I dont want to add the constrait otherwise I will add it.
I was having problem to first add a constraint with the constraint name so I could find the constraint before finding it if it already exists.
What should I do the above.
View 3 Replies
View Related
Aug 9, 2004
Hello,
How can I give default value to a field in a table which is already created, i.e. there is a table test and it have field test1 which is int(4). Now, I want to give a default value 0 to this field. As I am not able to access Enterprise Manager, I want to do it using Query Analyzer. How can I do this using Query Analyzer?
Thanks in advance,
Uday.
View 6 Replies
View Related
Jan 16, 2002
We just changed over our phone system and the new system uses all of the old extensions except it adds a 1 to the beginning of them. I know that there is a relatively simple way to update my phone extension column to show this, but I can't for the life of me remember what I need to do. Any help?
View 2 Replies
View Related
Oct 14, 2015
I am trying to do the following;
declare @table table
(
ID int,
InvoiceNumber varchar(10)
)
insert into @table
values (1, 20),
(2, 20),
(2, 20),
(3, 60),
(3, 60)
I am trying to add sequential alphabet letters to the InvoiceNumber value on each row. Example;
1 20a
2 20b
3 20c
4 60a
5 60b
and so on.
View 4 Replies
View Related
Jun 1, 2015
I have a table with a couple hundred billion records (sql server 2005). When I do a select count(*) from tblx -- it takes this side of forever. Is it possible to count partitions and then add them up to make it faster?
How I could improve the performance for count(*) of this huge table. Note: if the partition idea sounds viable -- what would that look like?
View 11 Replies
View Related
May 8, 2015
I have a table with ~30M records. I'm trying to add a column to the existing table with default value and have noticed following ... When using alter with default value- (Executes more than 45 min and killed forcefully)
ex:
ALTER TABLE dbo.Table_X Add is_Active BIT CONSTRAINT DF_Table_X_is_Active DEFAULT 'FALSE' NOT NULL
GO
When using update command after adding column with alter (without default value) it completes is 5 min.
ex:
ALTER TABLE dbo.Table_X Add is_Active BIT NULL
GO
UPDATE Table_X SET is_Active = 0 WHERE is_Active IS NULL
GO
Why there is so much of difference in execution times ? I was just trying to understand internal behavior of the SQL in these two scenarios.
View 4 Replies
View Related
