Tempdb - Locking System Tables
Mar 9, 1999
I have some stored procs that have temp table creations in them using "create table #tmptable...". I have noticed that when running the procs, sp_lock shows tempdb system tables being locked. I totally expect this. But, put a PowerBuilder front end on, and I get another situation. Calling the stored procs from PowerBuilder causes the same locks to occur, but they are not released after the data is displayed through the application. Furthermore, this blocks other users from creating anything in tempdb until the user logs off of the application and ends the connection to the database.
please help - is there something I am missing in my procedures, or is this a PowerBuilder issue?
Thanks!
Dean
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Sep 27, 2000
I am doing a ‘Select into’ to make a table from at another table which has as many as 130 millions rows (its well indexed). The new table will most often have about 1000 rows. (During the running of the app, the app will be making many new tables, since hopefully this will be a ‘popular’ item by the users. After the users ‘use’ them, they are dropped.)
I know that locks are held on various system tables (including sysobjects) during this ‘select into’ process. Are they held for the entire process?
What should I be concerned about doing ‘select into’?
Thanks for any help,
Judith
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Jul 23, 2005
Hi Group,I am facing a problem regarding locking. I have created a StoredProcedure in my Database. In this Stored Procedure Temprary Tables getcreated and after that values are inserted in these tables.But thisStored Procedure is called from Java Portal. When then Stored Procedureexecute from Java end new transaction begins. So all these temporarytables are created in tempDB and locking the entire Database.So at the same time if another user fires the same Stored Procedurefrom portal end its give the error "Lock time out". But if the prevStored Procedure execution gets competed before this request then noerror comes.So is there any way from database to restrict to lock the tempDBdatabase????Can you provide some valuable advice?Thanks in advance.RegardsArijit Chatterjee
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May 14, 2002
Hi, I wonder if anyone can shed some light on this issue -
We have a client/server program for MSSQL7 and MSSQL2000.
When running client/server - we have our own broker, etc,
the program ends up locking itself on SQL2000; this is not a problem on SQL7.
We noticed that it seems some system tables locking tempdb.
We also noticed that SQL2000 no longer has insert-into/bulkcopy option like SQL7. But, here we don't have temporary tables at all. It's just that we found the lockings in tempdb caused by some sysobjects, sysindexes, etc.
Also, this does not happen to all the systems we have. Some of our machine does not have the self-lock problem; most of the machines have this problem though.
If we don't run client/server, then the program works fine.
Same logic, the difference is when we use client/server logic to connect to the remote SQLServer 2000 server, the locking might happen on most of our machines.
Anyone is familiar with tempdb and locking issues, please provide some hint??? Is it possible that there are some system parameters that we can set to avoid the problem. We haven't found out why some of our machines do not have problem, while most of the machines have this locking problem.
The program is written using ODBC.
Many thanks in advance.
HIBA International
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Jul 4, 2006
I'm having an issue where a folder that I'm accessing in an SSIS package gets locked up and cannot be deleted by my package later in the process.
1) I use a File System task to rename the folder. At this point, it appears to become locked and cannot be deleted.
2) Later I attempt to delete the folder using another File System task object. I get the error '[File System Task] Error: An error occurred with the following error message: "The process cannot access the file because it is being used by another process."'.
My package accesses the folder via a drive mapping. This seems to be part of the problem, as it's possible to delete the folder directly but not via the drive mapping. Even once the package completes it's still not possible to delete the folder in Windows Explorer via the drive mapping.
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Sep 9, 2015
Application is throwing errors.Is there anyway to fix this with out restarting the server on a newly migrated system?
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May 2, 2008
Hi,
I found out that executing the procedure SP_INDEXOPTION and setting 'AllowRowLocks' to false i can prevent the sql server from locking rows in a table and 'AllowPageLocks' prevents from pages being locked. I need to preform same operation
in case of tables. I need to perform insertion operations concurrently and acquire required locks manually. Is there a way to stop sqlserver from acquiring locks on the table. I need to disable all the locks (row, page and table).
Thank you in advance.
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Jul 20, 2005
Hi,I have a few things on my databases which seem to be neither true systemobjects or user objects - notably a table called 'dtproperties' (createdby Enterprise manager as I understand, relating to relationship graphingor something) and some stored procs begining with "dt_" (some kind ofsource control stuff, possible visual studio related). These show up whenI use"exec sp_help 'databaseName'"but not in Ent. Mgr. or in Query Analyzer's object browser, and also notin a third party tool I use called AdeptSQL. I am wondering how thosetools know to differentiate between these types of quasi-system objects,and my real user data. (This is for the purpose of a customized schemagenerator I am writing). I'd prefer to determine this info with systemstored procs (ie sp_help, sp_helptex, sp_...etc) but will dip into thesystem tables if needed.Thanks,Dave
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Aug 16, 2001
I have a Table TEST (TCD int,NUMCD int ,TNM varchar(20))
where TCD is an identity column
1- When inserting I want the value of TCD to be inserted also in NUMCD.
2- I want to prevent two users to insert the same value of NUMCD
if executing the same insert at the same time .
For this i use the following insert :
INSERT Into TEST WITH (TABLOCK)
(NUMCD,TNM) select IsNull(Max(TCD),0)+1,'Abcd' from TEST
- Is the sql statment above resolve my probleme. If not is there someone who can help me resolving this probleme.
Think you for helping me
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Mar 8, 2005
Hi DB Gurus..
I need to lock one table ( table-level locking) as i dont want anyone to modify till i finish my stored procedure.
I need simple example on how to Lock the table and unlock..
Something like this
Lock Table Name...
...
statements go here
...
Unlock table...
Is this possible in Sql server 2000
waiting for ur replies..
Thanks in Advance
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May 2, 2008
I've written a C# program which (1) Calls a SQL stored procedure which, among other things, updates a table with email information and then (2) sends the email via Outlook. This is ultimately going to be on a production server where the C# email program can be called by a number of processes.
If more than one instance of the email program is invoked at the same time, problems could occur. For instance, after the first instance updated the table it would then begin the process of creating and sending the email, but if a second instance is called at that time,it could be updating the SQL table which I think would screw up the email the first instance was creating. As a solution, I've been looking into locking tables. What I'd like to do is lock the table after it's been updated and unlock it after the email is sent. I know I can use the SLEEP function in C# so if it tries to access the table and it's locked, to wait 20 seconds or so and try again.
So how can you lock (and unlock?) a table in SQL? I'm reading about using WITH (TABLOCK) in the UPDATE query, but I'm not sure that will solve my problem. From what I can tell, TABLOCK automatically "unlocks" when the update is done. That still wouldn't resolve the issue of instance 2 updating the SQL table after instance 1 had updated it, but BEFORE instance 1 has completing creating the email (based off the data in the table).
Thanks
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Apr 18, 2006
Hi,
I have a question regarding locking tables in transact sql.
The situation is the following:
a table named TableA which has two columns; ID and Name.
a table named IDTable which has two columns REF_ID, REF_PREFIX
in the IDTable we have the following entry:
REF_ID = 1, REF_PREFIX = 'TbA'
I have a stored procedure that will make a lot of inserts into the TableA. However there is another program that makes insert into TableA as well.
They both read from the IDTable to get which ID to use (ID of course needs to be unique).
A simplified version of the stored procedure is:
"SELECT all entries to move from another table"
"While not all entries moved"
"Get id from IDTable"
"Insert into TableA"
"Update IDTable"
"Loop"
I would like to have it like:
"SELECT all entries to move from another table"
"While not all entries moved"
"lock IDTable and TableA"
"Get id from IDTable"
"Insert into TableA"
"Update IDTable"
"unlock IDTable and TableA"
"Loop"
and thus giving the other program a change to "get in line" to use the tables but not using them at the same time.
So my questions:
1) Is this possible (if not, please explain why)?
2) How do I lock a table, I have tried "LOCK TABLE" but that just gives me syntax error?
Thank you in advance.
BR Mikael
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Apr 16, 2004
Hi all,
I am writing an sp which includes insert and update statements.
sp is working fine.
But when I tried to make it as a single Transaction its not working(waiting indefinetly at second insert statement).tables are getting locked.
what could be the possible reason for tables getting locked indefinetly.
I Tried with
set transaction isolationlevel serializable
option.
There are several insert into statements.some of them on the same tables again and again.
any help would be greatly appreciated.
Thanks.
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Oct 3, 2006
HI There
After upgrading my publishers to 2005 i noticed that i cannot specify not to lock tables during snapshot during publication creation, also not on publication properties, and i see sp_addpublication has no such parameter, is there no longer an option not to lock publication tables during snapshot?
Thanx
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Jul 14, 2003
Over the weekend, one of our out-of-house programmers ran an update to our three main tables. I know these are kind of broadstrokes, but basically he compared the data and updated certain fields when it met certain conditions (lots of rules basically). The three tables are one-to-one and contain a little over a million records. The comparison file contained around 400k records.
The scripts made it through 250k records from the comparison file before he had to stop it for the weekend.
When I came in to test the data yesterday - I was met with problems on my front end application - it would lock up on the write back to the database. I went into EP and experienced the same thing after making any changes to a record, it would just lock up. This only appears to be a problem on the 2 bigger tables of the 3. I currently have 12 gigs or so free on that box and I have already shrunk the log and data files.
I tried removing and re-adding the indexes, but I am freezing up everytime I try to either change or delete the Clustered Index on the Primary Key. I don't know why, but I thought maybe that was my issue.
I know this is pretty broad, but even if someone could give me ideas as to why SQL would lock up like that when trying to just save the data, it would be most helpful.
NOTE: There were NO structure changes in the update process and my restored data from Friday works perfect.
If you need more info, just ask. Thanks in advance for the help.
Don
elitecobra2000@yahoo.com
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Feb 1, 2008
Hi All -
My Set up:
Server A - Oracle 10g Database
Server B - SQL2005
Client PC - Sql Express
Server A holds all data. I am using a linked server to connect server A and B. I use a set of stored procedures containing the openquery() syntax to get data from Server A to Server B. These stored procedures run every 20 minutes. I then create a publisher on Server B. I subscribe from the client PC to publisher to get data down from Server B to client(Download only subscription).
When I fire up the stored procedures and attempt to replicate, everything works fine. It appears after about 4-5 hours of the stored procedures running replication begins to hang more and and more until eventually it hangs for about 10 minutes and I recieve the following error:
Command attempted:
{call sp_MSreleasemakegenerationapplock}
Error messages:
The merge process was unable to create a new generation at the 'Publisher'. Troubleshoot by restarting the synchronization with verbose history logging and specify an output file to which to write. (Source: MSSQL_REPL, Error number: MSSQL_REPL-2147200994)
I'm not sure if there is an error with openquery() locking? There is some locking activity going on with the TempDB and and Server B database. I've also come across some threads talking about the agent profiles. I'm very new to replication and very confused by all of the options in the agent profiles. Any help would be greatly appreciated!
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Apr 5, 2006
We have transactional replication running with a seperate publisher/distributor/subscriber. I want to add a couple of articles to the publication, and then initialise them. I have added the articles and run sp_refreshsubscriptions
I now want to refresh the subscriptions. I have selected not to lock the tables on the snaphot tab of the publication properties, but whenever I run the snapshot agent it locks the application solid! Its odd, as soon as I run the snaphot agent, the phones start ringing within minutes. The application is Great Plains and I have set the snapshot agent to run nightly anyway.
Is there any way I can run the snapshot agent during working hours to refresh this one article? Once I have successfully done this, I have a number of articles want to add - but I can't lock the tables when refreshing the initial snaphot.
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Jan 11, 2008
Is there a way to determine what application or who might be creating numerous tables in the tempdb. I have one that has grown yet the sp_spaceused command shows the majority of the database empty.
I need to determine where they are coming from and how I can delete them short of stopping and starting the SQL services before it uses up all of my HD.
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Jun 25, 2007
Hi, all experts here,
I encontered a problem which did not allow me to select any thing from the temparary tables of the tempdb database. (e.g one of the temparary tables is #239E4DCF), why is that and how can we solve this problem? As I urgently need to look at this tempdb database, it is full. I am looking forward to hearing from you and thanks a lot in advance for your help.
With best regards,
Yours sincerely,
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Jul 19, 2000
Does anyone know what system tables are used when a sp_spaceused is executed?
Thanks in advance
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May 26, 2000
I want to get rid of systemtables or systemstored procedures which displays when ever i creat new database.
How can I get rid of system tables ?
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Jan 26, 2001
Hi All
I want to know where I can find Object permission detailes, For example
I have table1 and user "abc", I have given permission to user "abc" for table1 to "SELECT" "INSERT", "UPDATE", I want to know where this detail is stored in system table. I was looking at "SYSUSERS","SYSLOGINS",
"SYSPERMISSIONS", "SYSMEMBERS", "SYSOBJECTS" I couldn't find anything, If some one can post your answers that will be great.
Thanks in Advance
Regards
Ram
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Apr 15, 1999
Hello,
I have succesffuly BCP out system tables(sysdatabases, sysdevices, syslogins, and sysusages). Now I want to BCP those same tables IN to create devices, databases and so on using the BCP utility. I run the same command used to BCP out and only changes the OUT to IN but it did not work.
Can somebody whose done this before tell me how to do it.
Many Many thanks,
Ana.
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Nov 29, 1998
Where can I find a discussion of how to interpret the keys1 and keys2 columns of the sysindexes table? These columns are binary(255) and are supposed to contain a description of the columns to which the index applies. I also need to know how to interpret the status column of the sysconstraints column.
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Jul 10, 2002
Hello,
I've one Sybase DBA asking this question, Is this really true, Pls help me.
Due to architectural changes in SQL Server 7.0, you cannot dump the transaction log if a database's system tables are inaccessible (due to media failure, for instance)in 7.0 and later versions. Microsoft recommends that separate devices be used for system tables and user tables to allow a final log backup to take place in the event the data device is inaccessible. The additional exposure incurred by not doing this is possible loss of data for the interval between the last transaction dump and the point of failure.
Thanks
Qinglee
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Jun 2, 2008
Hi Gurus,
select * from sys.server_principals is not working for me on 2000 SERVER.
This works fine on 2005 SERVER..
Where Iam going wrong ..please advice..
Thanks,
ServerTeam
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Sep 28, 2006
Hello all.
can anyone advise me where I can find a relationship diagram for the system tables in SQL Server2000.
Thanks all.
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Oct 31, 2007
Hi,
I'm doing an impact analysis to see what views / stored procedures etc are impacted by a change to columns in a table.
I'm using the system tables to identify these changes, and it is something that I'll have to repeat across all our databases in case the tables are being accessed from elsewhere.
I'd like to make sure I'm doing it the right way so could someone point me in the direction of a good article or code for doing this.
thanks
Sean
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Jul 20, 2005
I dont want to see these at all and cannot find where tospecify a view or modification of a view. can someone throw me abone here and tell me where to make the adjustments if I can make themat allMichael
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Oct 26, 2006
Hello,
I have created a linked server XYZ that is linked to server ABC. I am tying to view the tables via XYZ but I'm unable to do so. I can only see the system tables. When I run a select statement, I get the correct results. That means I have the access to the tables, yet why am I not able to see the tables.
Please assist
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Dec 24, 2007
Hello,
Is it possible to:
Add a system table using smo (or at all)?
Add new rows to a system table?
Thanks,
Assaf
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Mar 19, 2008
In SQL mngt studio...what is the system tables folder in the tables folder supposed to be used for? Do I need to use it for anything?
Gater
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Jul 10, 2002
Hello,
I've one Sybase DBA asking this question, Is this really true, Pls help me.
Due to architectural changes in SQL Server 7.0, you cannot dump the transaction log if a database's system tables are inaccessible (due to media failure, for instance)in 7.0 and later versions. Microsoft recommends that separate devices be used for system tables and user tables to allow a final log backup to take place in the event the data device is inaccessible. The additional exposure incurred by not doing this is possible loss of data for the interval between the last transaction dump and the point of failure.
Thanks
Qinglee
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