Temporarily Dropping Constraints
Apr 27, 2007
Assuming that I have created relationships (PKs and FKs) on my tables already, does the following statement permanently remove a Foreign Key constraint, or does it mearly disable it?
ALTER TABLE myTable NOCHECK CONSTRAINT FK_myForeignKey
GO
Also,
I can't seem to find out how to temporarily remove the Identity qualifier of a field, and then reset it back as Identity later. Any help?
Finally, will a failure of ALTER TABLE affect the @@ERROR variable? Can I check @@ERROR after each ALTER TABLE table statement to see if @@ERROR <> 0?
The reason for both of these issues is that I am redesigning an unnormalized database, and I need to write a large script to drop all constraints on all tables, transform the data as normalized into the new table structure, and then re-enable constraints, Identity fields, etc. Thanks.
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Nov 15, 2007
I am doing a data conversion in which I drop constraints before inserting data and then reapply at the end. I would like to also drop the not null constraints for certain columns, transfer the nulls and then fill them in later before reapplying the constraints. Is there a relatively simple way to drop and reapply the not null constraints?
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Feb 21, 2007
I am testing Insert, Update etc. and messing up my database with "dirty" data. Is there a way to temporarily drop FOREIGN KEY constraints to truncate a table after testing without dropping the whole table and rebuilding it?
Newbie
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Oct 15, 2007
How to remove the constraints on a table in sql server 2000? I need to drop the column, so i need to drop the constraint before that.
Alter Table Table_Name NO CHECK constraints ALL.
Once I execute the above one, it says, "Successfully Executed" but when I try to drop it doesnt allow me and gives me the following error:
Server: Msg 5074, Level 16, State 1, Line 1
The object 'DF_Users_Created_by' is dependent on column 'CREATED_BY'.
Server: Msg 4922, Level 16, State 1, Line 1
ALTER TABLE DROP COLUMN CREATED_BY failed because one or more objects access this column.
Any ideas?
Thanks,
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Jun 1, 2004
Hi,
Is it possible to use wildards in SQL to drop a constraint on a table?
Thanks!
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Jul 28, 2006
I have some C# code written a little while that imports data nightly
into a database. Most of the data is typically deleted from the tables
and imported again. There are some tables where data is never deleted
and references other tables. Because there are constraints between
these tables, the code processes the import in the following sequence.
get constraints from database->drop constraints->delete data->apply
constaints->import data
I was curious how I can accomplish similiar results in SSIS. I know I
can execute a process task to manage the constraints, but I was
wondering if there is any other way.
Thanks,
PJ
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Jun 29, 2007
Hello
We've got a product which uses merge replication with anonymous pullsubscriptions.
At most custome sites it's running on SQL Server 2000, a few with SQL 2005, which is running wich replication compatibility level 80 due to .
As it happens, db schema changes. So I have to drop a column with a default constraint. First the constraint, then the column.
This works excellently on the publisher - but not on the subscriber
The schema script 'exec sp_repldropcolumn '[dbo].[role_modul_rmd]', 'rmd_modul_enabled', 1' could not be propagated to the subscriber. (Quelle: MSSQL_REPL, Fehlernummer: MSSQL_REPL-2147201001)Hilfe abrufen: http://help/MSSQL_REPL-2147201001The object 'DF__role_modu__rmd_m__3119DB2C' is dependent on column 'rmd_modul_enabled'. (Quelle: MSSQLServer, Fehlernummer: 5074)Hilfe abrufen: http://help/5074ALTER TABLE DROP COLUMN rmd_modul_enabled failed because one or more objects access this column. (Quelle: MSSQLServer, Fehlernummer: 4922)Hilfe abrufen: http://help/4922
What can bi done?
Thanks for your advice
Aline
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Oct 13, 2004
Hi, I want to drop a column from a table with default constraint. It is giving me error..
------------------
Server: Msg 5074, Level 16, State 1, Line 1
The object 'DF__ACTIVITY___ROLLU__108B795B' is dependent on column 'ROLLUP_BGT_COST_FIXED'.
Server: Msg 4922, Level 16, State 1, Line 1
ALTER TABLE DROP COLUMN ROLLUP_BGT_COST_FIXED failed because one or more objects access this column.
-------------------------
Here is the drop statement
-----------
DROP STATISTICS ACTIVITY_BASELINE.ROLLUP_BGT_COST_FIXED
ALTER TABLE ACTIVITY_BASELINE DROP COLUMN ROLLUP_BGT_COST_FIXED;
------------------------
How can I first drop the constraint?
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Jul 23, 2005
I just looked at a coworker's stored procedure and this person isdropping 4 Foreign key constraints and then re-adding them afterprocessing the required logic (updating rows in the 4 tables inquestion).Is there *ANY* good reason to do this? What are the performanceimplications of doing this - negative or otherwise?I was furious when I found this because every once in a while I wouldnotice that the constraints would be in flux....some days they werethere, othere days there were not. I mean, this is a good enough reasonto NOT do this, but I need some additional feedback. Maybe there *is* agood reason, and that the logic just needs tweaking.Thanks.
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Jan 9, 2007
I know this is probably a flick of a switch but I cannot figure out which switch. Setup is SQL Server / Stored Procedures / DAL / BLL(skipped for testing) / PL. The stored procedure queries from only one table and two columns are ignored because they are being phased out. I can run the stored procedure and preview the data in the DAL but when I create a page with an ODS linked to the DAL and a GridView I get this error. I checked every column that does not allow nulls and they all have values. I checked unique columns (ID is the only unique and is Identity=Yes in the table definition). I checked foreign-key columns for values that are not in the foreign table and there are none. Any ideas why do I get this?
Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
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Jan 17, 2008
Hi,
I am getting the above error when trying to load a report into my Web Application, I have tracked the error down to one specific field in my database. Even though this field is a NVarChar field and is of size 30 it would seem that there is an issue returning the value from the field. I can write it into the database no problems but when I try to get it out of the database it returns the above error.
e.g
MOB 401.908.804 - Fails
0401.907.324 - okay
8239 9082 (pager) - fails
Anyone got an idea on how to fix this????
Regards..
Peter.
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Jun 15, 2007
Is there a way to temporarily disable replication? My problem is that I have pull subscribers that I do not want accessing the database at certain times, so that data updates and backups can occur. Is there a way to make that happen?
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Feb 13, 2008
I and my backup admin have full server, database, and SRS admin rights. We both have several subscription reports active. I need to temporarily disable all subscriptions for today. Of course, I can see my subscriptions, get into them, and stop them. However, from SQL Server Management Studio / Reporting Services, I can see her subscriptions but can not find a way to disable them.
Any ideas?
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Mar 9, 2007
Guys,
Is there a way to temporarily disable logging into the transaction log.
In our system, we perform purging of our database every night, where the purging consists of 2 steps:
1. For each table, insert the data, to be deleted, into a corresponding "purged" table, to remain there for one day only.
2. For each table, delete the unnecessary data (i.e. same data stored in purged tables in step 1)
During these 2 steps, the transaction log grows, and since we perform the transactional log back up, the back up at that time is huge. We are running a bit low on the hard disk space and I'd like to disable logging into the transaction log when these operations are performed.
I really don't care about being able to recover this data.
I thought that one option is to set the database to simple recovery, then perform the purging of the database, and then change back to full.
However, I think that trans log can grow even if recovery model is simple [although you won't be able to retrieve any changes].
So, is there a way to delete a portion of a table [or insert into it] so that no data is written to a transaction log (I know that we can use TRUNCATE if we need to remove whole table without logging)?
Thanks a lot
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Dec 13, 2013
I am looking for "substitution variables to temporarily store value" with sqlcmd in sql server . I know the query in oracle, but looking for equivalent query in sql server?
In oracle query is like this:
select *
from tablename
where deptnumber = &department_number;
Enter Value for department_number
I am looking this query in sql serevr2008.
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May 13, 2006
I have synchronous mirroring. Some times I loose connection to witness and mirror servers. These times primary server is down. Is there any way I can change mirroring to asynchronous when primary server is down due to communication break down between witness and mirrored servers? I can break mirroring but to re-establish mirroring, I have to backup and restore on the other side. So if I can change mirroring to asynchronous when primary server is down due to connection breakdown between witness and mirrored server, then when witness and mirror servers come back, I don't need to restore the entire database. Ofcourse I could use asynchronous always but that does not failover automatically. I am thankful to all answers and suggestions. Thanks.
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Feb 19, 2007
I have an application that dumps massive amounts of data into a database during the installation. My log file always ends up being 30-40GB+ at the end of the install. Can I turn off logging while I do the install and enable it after? What are my options.
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Apr 4, 2014
is there a way to temporarily remove a record and then putting it back again? in my case I have lots of test patient with last)name ='test' and first_name='test'. I want to remove these test patient temporarily , do my calculation and them put them back.
The table is called "person" and all these test patients are in there including real patient under their last-name, first_name.
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Feb 27, 2007
Poor Performance Temporarily Cured by Re-booting SQL Server
Please can you help?
SQL Server 2000.
Accessed by VB.Net 2003.
Server set up by SQL consultant (who is no longer available).
We have a regular problem, which is most noticeable when analysing data (rather than data inserts/deletions) for producing xml or csv files or reports, even though the amount of data is relatively small. However structure of database means that there are still quite a lot of records and a lot of links between tables (database is currently being redesigned but in the mean time the problem still exists).
The problem is that access slows down dramatically and in some cases all but stops (one example is a csv file being produced where only a few lines have been output in 30 minutes). In every case the symptoms can be solved by re-booting the SQL server, after which the entire csv file is output in 10 minutes. Obviously though we wish to solve the problem and not just the symptom.
Additional information:
Transaction logs are backed up at 13:00 and in the evening (both periods of very low usage).Full backup is run in the evening and at 13:00 (both periods of very low usage), with integrity check performed prior to full backup. Database is optimized after the full backup including shrinking the database leaving 15% of the data space free.
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Feb 10, 2015
I need to run a script in production that adds primary key to a table. Because table is large, I can't run it in one shot, the log file is not so large to accommodate it. Instead, I created a new table with same structure plus new surrogate primary key, and I populate it in a cursor loop.
I already ran it many times in test server, and no problems with that. But the problem will be in production when applications will be accessing this table and try to insert/update it while I am running my loop.
So I am looking for a solution how to block users to access this table, it's OK if they receive an error. Setting database to single user mode will not work because I don't want to block them from all the rest tables in this database.
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Aug 12, 2015
I have transactional replication configured where the publisher and subscriber are on two different servers. Yesterday a database upgrade was carried out, and the DBA dropped replication by issuing sp_removedbreplication on the published database. The subscription is still set up.
I have two questions:
1 - What is the safest way to temporarily switch off replication without losing the publication or subscription? As far as I was aware (my replication knowledge isn't great), simply disabling the relevant agents would do the job.
2 - I now have the task of creating the publication again (fortunately we have a saved script). If I recreate this publication, will I be able to point the existing subscription at it?
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Sep 12, 2014
How I can measure the volume of data created temporarily to replace usage of physical tables in an SQL query.
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May 28, 2002
Is there a way we can prevent a object owner from dropping his tables. Example:
There is a user called 'tom' who is given create table permissions, 'tom' creates the table completes his dev and then the table is moved into production where 'tom' is still the owner. However, in production, 'tom' does not have the create table privs. Because 'tom' is the owner of the table, he is still able to drop the table in production. This is what I am trying to avoid. I would like to retain 'tom' as the owner and want to take away his create/drop privs.
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Nov 17, 2000
Does anyone have any generic scripts that Drop all the statistics that SQL auto generates?? I have hundreds of '_WA_....'
indicies that are auto created by SS7 and I just want to get rid of ALL of them. Thanks!
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Dec 7, 1999
Simple heres the syntax Alter Table XX Drop PRIMARY KEY.
This is not working whats up?
Thanks,
Phil
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Apr 12, 2001
Whats the quickest way to drop a column from a table with 1 million rows.
This is for SQL Server 6.5
Thanks for all the responses,
Chan
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May 22, 2001
I need to drop a database but cannot because there are 2 open connections that I cannot drop via EM. Is there a way to do this without starting and stopping??
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Jul 20, 1998
Hi,
I`m new at SQL Server so excuse me if this question sounds dumb.
Does anybody know how to drop columns in a table. I know I can drop and re-build the table,
but I would prefer and easier way.
Thanks
-Z
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Dec 21, 1998
Hi,
After I drop the database, I backed up the master database, I recreate the database with new name. When I tried to do the import on the command level,
It gives me the error:
Attempt to locate entry in the sysdatabases for database 'db1' by name,
failed -- no entry found in that name.
What should I do? Thanks.
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Jul 6, 2001
I have run the following script to create a default on a table:
alter table TableXYY
add default 0 for ColumnX
Now, how do I delete this default (without re-creating the table)??
Thanks
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Jul 23, 2001
Anyone know how to drop all users associated with a particular login not matter what database they're contained in?
ie login AdminUser / User AdminUser (in databases master, Dev1)
....
Thus, is there a way to drop the AdminUser login above and associated user
AdminUser in databases master, Dev1 in example above.
Thanks
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Sep 7, 2007
Hi friends,
How I can drop a database insatance from a different server ( data base is SQL Server 2005) from my code
Hoping a early reply ....
Thanks :)
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Feb 22, 2004
Hi
I am using SQL server 7 database and ASP as front end. I run an application where a text file is loaded into database. After this is done procedures are run to create a set of tables that have snapshots of the data in the text file.. each time i load a new text file i want to create the snapshots.. i hve written a stored procedure to create tables and insert values into the tables.. however how do i delete the tables i created the previous time.. the number of snapshots and their names will depend on the size of the text file.. how do i refer to all the snapshots created and drop them all before creating new ones?
plese guide
regds
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