Is there any easy way to truncate a table which has a foreign key restraint? I want to override the default behavior which is to not allow truncate of parent tables. I want to be able to temperarily remove the contraint so I can truncate the temple, how do you do this?
Hi,
I am looking to delete a single row from a relatively small table. Unfortunately, there is a foreign key relationship between this table and a much much larger table. The checking of this foreign key when I am deleting this row seems to significantly impact the performance of the operation. Previously there was an index on this larger table that helped this query run. This index has been dropped to improve the performance of a more frequently executed operation.
Is there a way I can use a hint or something to stop SQL checking this foreign key when deleting the row? I am certain that there are no associated rows in the larger table.
I have read elsewhere that I could disable the foreign key, perform the delete, then enable the foreign key. This delete statement is not a one off process and could happen in the normal operation of the application so I don't really know what the implications of doing this are.
Any suggestions would be appreciated.
Thanks
Rich
Hi all,
I was wondering if there is an easy way to loop through all contraints in a database and programmatically set the cascade delete to ON. I have a database with hundreds of contraints, so individually setting cascade delete on them is not optimal.
Thanks for any info in advance!
I think that the constraints are simply held in one of the system datatables, is there anyway to simply update that table?
how to find who delete/Truncate the data from table ,because i don't have any trigger on the table.
View 5 Replies View RelatedI have to truncate access table before I insert records to access database table.
I tried using Delete From Table_name or Truncate table Table_NAME and I have used Microsoft Jet 4.0 OLE DB Provider. It does not seem to work. I read some post on forums. None of them seem to work while truncating or deleting records from one of the access database table.
Is there any easy way to truncate access database without using script component and VB scripts. I do not know how to Write VB scripts so trying to find alternatives.
[URL]
Hi,
i needDifference between truncate and delete..could anyone help
Hi all
i have a problem.
i have this method
protected void DeleteDataFirstAccess()
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select name from sys.all_objects where type='U'";
DataTable table = DataBase.GetDatatable(cmd); //this is one of my method wich return a datatable with data
foreach (DataRow row in table.Rows)
{
SqlCommand cmd_delete = new SqlCommand();
cmd_delete.CommandText = "TRUNCATE TABLE " + row[0].ToString();
cmd_delete.Connection = conn;
cmd_delete.ExecuteNonQuery();
cmd_delete.Dispose();
}
cmd.Dispose();
}
when i run i have an error with some tables constraints.
As you know If we try to TRUNCATE a table, and the table is have a relationship with other table like for exemple Employees_Salary with the constraint of SQL Foreign Key then we can't TRUNCATE the table with SQL Truncate Table command, we need to TRUNCATE the Employees_Salary table first because Employees_Salary is depending on it and that is having some records. That's why we need to TRUNCATE both tables and the sequence is to empty that table which is based on SQL Foreign Key or remove this constraint first.
What i need is a list of all database tables ordered by the right sequence considering the constraints
Anyone can help me?
thanks in advance
bye
Marco
I have an issue with Delete statement.In the code given below (its a part of actual proc),if we use TRUNCATE to clean the temp tables, everything goes fine.But if I use DELETE in place of truncate, system skips the IF loop 'if (@script_type = 1 OR @script_type = 2)'I am not able to understand this behavioral difference between DELETE and TRUNCATE.Recently the database is being used for replication, but that should not be a reason.
SELECT @max_rows = COUNT('X') FROM #temp_table1
SET@row_cnt = 1
WHILE @row_cnt <= @max_rows
BEGIN
[code],...
Hi seniors
there are two tables involve in replication let say table1 and replicated table is also rep.table1.
we are not deleting records physically in table1 so only a bit in table1 has true when u want to delete a record but the strange thing is that replication agaent report that this is hard delete operation on table1 so download and report hard delete operation and delete the record in replicated table which is very crucial.
plz let me know where am i wrong and how i put it into right way.
there is no triggers on published tables and noother trigger is created on published table.
regards
Ahmad Drshen
Here is my issue I am new to 2005 sql server, and am trying to take my old data which is exported to a txt file and import it to tables in sql. The older database is non relational, and I had made several exports for the way I want to build my tables. I built my packages fine and everything is working until I start building relationships. I remove my foreign key and the table with the primary key will get updated for the package again. I need to update the data daily into sql, and once in it will only be update from the package until the database is moved over.
It will run and update with a primary key until I add a foreign key to another database.
Here is my error when running the package when table 2 has a foreign key.
[Execute SQL Task] Error: Executing the query "TRUNCATE TABLE [consumer].[dbo].[Client] " failed with the following error: "Cannot truncate table 'consumer.dbo.Client' because it is being referenced by a FOREIGN KEY constraint.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
Hello:
Need some serious help with this one...
Background:
Am working on completing an ORM that can not only handles CRUD actions -- but that can also updates the structure of a table transparently when the class defs change. Reason for this is that I can't get the SQL scripts that would work for updating a software on SqlServer to be portable to other DBMS systems. Doing it by code, rather than SQL batch has a chance of making cross-platform, updateable, software...
Anyway, because it needs to be cross-DBMS capable, the constraints are that the system used must work for the lowest common denominator....ie, a 'recipe' of steps that will work on all DBMS's.
The Problem:
There might be simpler ways to do this with SqlServer (all ears :-) - just in case I can't make it cross platform right now) but, with simplistic DBMS's (SqlLite, etc) there is no way to ALTER table once formed: one has to COPY the Table to a new TMP name, adding a Column in the process, then delete the original, then rename the TMP to the original name.
This appears possible in SqlServer too --...as long as there are no CASCADE operations.
Truncate table doesn't seem to be the solution, nor drop, as they all seem to trigger a Cascade delete in the Foreign Table.
So -- please correct me if I am wrong here -- it appears that the operations would be
along the lines of:
a) Remove the Foreign Key references
b) Copy the table structure, and make a new temp table, adding the column
c) Copy the data over
d) Add the FK relations, that used to be in the first table, to the new table
e) Delete the original
f) Done?
The questions are:
a) How does one alter a table to REMOVE the Foreign Key References part, if it has no 'name'.
b) Anyone know of a good clean way to get, and save these constraints to reapply them to the new table. Hopefully with some cross platform ADO.NET solution? GetSchema etc appears to me to be very dbms dependant?
c) ANY and all tips on things I might run into later that I have not mentioned, are also greatly appreciated.
Thanks!
Sky
I'm trying to clean up a database design and I'm in a situation to where two tables need a FK but since it didn't exist before there are orphaned records.
Tables are:
Brokers and it's PK is BID
The 2nd table is Broker_Rates which also has a BID table.
I'm trying to figure out a t-sql statement that will parse through all the recrods in the Broker_Rates table and delete the record if there isn't a match for the BID record in the brokers table.
I know this isn't correct syntax but should hopefully clear up what I'm asking
DELETE FROM Broker_Rates
WHERE (Broker_Rates.BID <> Broker.BID)
Thanks
Can someone write for me an example query that would select all the constraints that are applied to specific table?
something like:
SELECT
FieldThatHasConstraint,
FieldTableName,
TableToWhitchThisFieldHasConstraint,
FieldOfTableToWhitchThisFieldHasConstraint
TypeOfConstraint
FROM
???
WHERE
TableThatIWantToSearchForConstraints='myTable'
Is Microsoft full of #*$#*% (again) or am I badly misunderstandingsomething?Quote from Microsoft's T-SQL doc:[color=blue]> INSTEAD OF triggers are executed instead of the triggering action.> These triggers are executed after the inserted and deleted tables> reflecting the changes to the base table are created, but before any> other actions are taken. They are executed before any constraints,[/color]^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^[color=blue]> so can perform preprocessing that supplements the constraint actions.[/color](SQL Server 2000 sp3a)CREATE TABLE t (a INT PRIMARY KEY,b CHAR(1) NOT NULL)I want to override the value of [b] with the value of 'X' wheninserting into t...CREATE TRIGGER t_tbi ON t INSTEAD OF INSERT AS BEGINSET NOCOUNT ONINSERT INTO t (a,b) (SELECT a,'X' FROM inserted)ENDLet's try it...INSERT INTO t (a,b) VALUES(1,'z')SELECT * FROM ta | b---|---1 | XGood, the trigger did what it was supposed to. Lets try aslight variation...INSERT INTO t (a) VALUES(2)Server: Msg 233, Level 16, State 2, Line 1The column 'b' in table 't' cannot be null.WTF? What was that I just read about "[instead-of triggers]are executed before any constraints"?!?!What's going on here???
View 8 Replies View RelatedHi,I was wondering how to do this.I have a table with two columns in design view (start date, end date).How do I set it within sql server (as constraint) or whatever that thestart date less than or equal to end date?Thanks:DHRUV
View 5 Replies View Related
Hi, I want know how can I to build a query to get all the foreignkey contrains exist between tables using the sys tables, for example if the user select this two tables:
dbo.cat_states -> with this fields -> id_state & desc
dbo.cat_universities -> with this fields -> id_state, id_university & desc_university
I want get something like this:
dbo.universities.id_state = dbo.states.id_state
tks 4 help
Leo
i did a Stored Procedure to truncate a table. it contains lots of crap from testing the site. just a simple 1 ALTER PROCEDURE dbo.TruncateUploads
AS
TRUNCATE TABLE Uploads but it says "Cannot truncate table 'Uploads' because it is being referenced by a FOREIGN KEY constraint." then i make NULL all foreign keys and try still cannot. then i did it manually deleting all records then can! but why can't i truncate it? isn't it the same as removing all values plus having the primary keys to start from 0?
How can i TRUNCATE my table (removes rows that were produced at testing), so that in the actual running the automated IDNumber for my table start with 1.
View 6 Replies View Relatedhi, I have two tables members table and orders table.
I have 2 records in members table and zero records in order table.
When I try to truncate members table I get an error message.
cannot truncate table members,because it is being referenced by a FOREIGN KEY constraint.
this what blows my head, There is no records in orders table. so why would the constraint enforced when there is no data in the order table. I created same table in access and I was able to delete a member from the members table. any comments.
thanks
Ahmed
I have several very large tables and sometimes I need to clean them.
It's known that TRUNCATE TABLE works much faster than DELETE, but impossible to use TRUNCATE TABLE on a table referenced by a FOREIGN KEY constraint... Is it possible temporary disable (not delete) constraints and after complition of TRUNCATE enable them ?
Hi,
(From Bol)
"You Cannot Use Truncate Table On A Table Referenced By A Foreign Key
Constraint;"
1) States
Statecode TinyintPrimary Key
Statename Varchar(25)
2) Rivers
RivercodeSmallint Primary Key
RivernameVarchar(40)
3) Riverinstates
StatecodeTinyint,
RivercodeSmallint,
Constraint Pkriverinstates Primary Key(Statecode,Rivercode),
Constraint Fkriverinstates
Foreign Key (Statecode) References States(Statecode),
Foreign Key (Rivercode) References Rivers(Rivercode)
after removing all rows from RiverInStates Table using TRUNCATE and the command completed successfully.
when i tried to remove all rows from Rivers table , i got the following error.
"Server: Msg 4712, Level 16, State 1, Line 76
Cannot truncate table 'rivers' because it is being referenced by a FOREIGN
KEY constraint."
i thought the error may be due to the "Fkriverinstates" FOREIGN KEY CONSTRAINT. so i DROPped the constraint with
ALTER TABLE RiverinStates DROP CONSTRAINT Fkriverinstates
even after DROPping the constraint, im getting the same error
can any one point out where the problem is?
thanks in advance
what is the best way to truncate/delete records from a table at a certain time of the day...... i'm sure this is a simple ?, but i'm still learning sql.
thanks,
eddie
any idea why this is not wroking ?
------------------------------
declare
@TableName varchar
DECLARE
EmptyTables CURSOR FOR
Select Table_Name From Information_Schema.Tables
Where Table_Type = 'Base Table' Order By Table_Type
open EmptyTables
FETCH NEXT FROM
EmptyTables
into
@TableName
WHILE @@FETCH_STATUS = 0
BEGIN
truncate table @TableName
FETCH NEXT FROM
EmptyTables
into
@TableName
END
close EmptyTables
deallocate EmptyTables
I have a database of 25 GB. I truncated a table which holds around 5 GB of data.
Even after truncation, I see my database size as 25 GB...
Should I run a shrink database after the truncation?
Thanks
Santhosh
I have somme users who need to truncate some tables owned by DBO. I know that only table owner or DBO can execute TRUNCATE TABLE but I don't want grant DBO permission to those users. Do you have any suggestion ? Thanks a lot.
View 4 Replies View RelatedIf I have a truncate table statement in a stored proc, will my log backups be compromised due to the nonlogged operations. If so, what are my alternatives in case that I need to restore? Differential backups?
View 1 Replies View RelatedI am doing the following-
begin transaction
truncate table Acounts
select * from Accounts
rollback
select * from Accounts
The first select is returning 0 rows as expected. But after doing the rollback I expected to yet see 0 rows as truncate is not logged so cannot be rolled back. But to my suprise I see that there are rows.
So the rollback is rolling back the truncate table statement. Can someone please explain this????
I know that only the owner of a table can truncate it.
I want a user to run a procedure that truncates a table. Both the procedure and the table are owned by dbo, however the system says that the user can't truncate the tables because she doesn't have permission. The user has dataread and datawrite global permissions, and I do not want to give her dbo perimssions.
Is there a solution to this?
Hi all,
Is it possible to TRUNCATE a table and BCP data into the same table in one
TRANSACTION?
My problem is that I want to refresh(delete and via BCP append new data) a
table without disturbing running applications. Can I run BCP from a
SQL-script or a stored procedure?
Thank`s
Jonas Dahlqvist
Alfa Laval Automation AB
Does anybody know of a way to allow non-administrators to execute the truncate table statement?
I have developers that from time to time need to move data between their databases usinge the DTS wizard. Most of their tables have identity columns and in order retain the identity seed, they need to click on the option to enable identity insert. This option isn't available to non administrators.
Error Message "Cannot TRUNCATE TABLE 'HR.dbo.Employee' ".
All of a sudden (!) I began to get this error whle attempting to run a multi-step job: This is during a very simple T-SQL statement.
Executed as user: EPRODSQLAdmin. Cannot TRUNCATE TABLE 'HR.dbo.Employee' because it is being referenced by object 'v_apps_Employee'. [SQLSTATE 42000] (Error 3729). The step failed.
Tables are being referenced by views all the time... Why would I begin to get this message?
The only thing I can think of is that I had just made my first "indexed view" ever, and it is in this database. Could that be related to the new error message?
hi
Can We Use Truncate Command on a table which is Refernced by Foreign Key?
HI,
I am trying to find a replication solution. It does not have to be real-time, but snapshot will not work since the database is too big. I was trying to configure Transactional replication. The replication itself worked good, but the Truncate table is not allowed in the transactional replication and merge replication. We have to use "Truncate table" in another processes during replication. Is there any other option or third party application I can use to do the replication with truncate table working. I tried Replication Exec, but it does not support 64bit system, which we have.