I have some questions about locking tables in stored procedures. I got some excellent tips from my last post, but since it's sort of a different problem I figured I'd post it separately.
I have a large log table I need to do manual, periodic clean-up process on, which basically is purging unneccessary log-entries. The idea is to select out the 1-3% I need to another table, drop the old table, and rename the new table to the old one.
The problem is that I most likely will need to lock the entire table while I do all the clean-up stuff. If a client manages to add things inbetween this is going on, I could end up loosing data.
The table looks like this:
Logid PK
LogTypeID -- what category
LogValue --
LogTime -- when it occurred
My imaginary stored procedure looks something like this:
CREATE PROCEDURE ShrinkDB AS
-- 1)
"lock table log" -- do I have to do something like this?
-- 2)
select * into log_keep FROM Log where
(
logtypeid <> 2020 AND -- activity played
logtypeid <> 5020 AND -- database connected
-- ....etc et..... about 10 different things I don't need to keep
or logtime > dateadd(d, -1, getdate()) -- keep everything from last 24 hours
)
-- 3)
drop table log
-- 4)
EXEC sp_rename 'log_keep', 'log'
GO
I'm not able to figure out wether I need to run some sort of "Lock" command or not, or if everything inside a stored procedure automatically is locked. If so, I shouldn't worry about loosing any data I guess??
Hopefully it works that way, but if not I assume I'll run into these two problems:
- If a client logs immediately after the Selecet, could data be logged AFTER the select, but BEFORE the drop table-command? In which case I guess I would loose data?
- Immediately after the drop table log in step 3, there's no table named 'log' in my database. 'Log' will be "created" when I run step 4. This means I could perhaps loose data since the client for a brief moment can't log data to the 'log' table?
Hopefully someone can clearify this for me, I've read the documentation, but I don't feel too sure on this subject.... :-)
Hello,Can we lock stored procedure until its execution is complete ?I dont want 2 clients to simultenously execute the stored procedure inSql Server 2000.My front end is ASP.net 1.0Thanks in advance.waiting for the reply.
Hello!I am trying to investigate strange problem with particular storedprocedure. It runs OK for several days and suddenly we start gettingand lotof locks. The reason being [COMPILE] lock placed on this procedure. Asaresult, we have 40-50 other connections waiting, then next connectionusingthis procedure has [COMPILE] lock etc. Client is fully qualifyingstoredprocedure by database/owner name and it doesn't start with sp_. I knowthese are the reasons for [COMPILE] lock being placed. Is theresomethingelse that might trigger this lock? When troubleshooting this issue, Inoticed there was no plan for this procedure in syscacheobjects. Thestoredprocedure is very simple (I know it could be rewritten/optimized butourdeveloper wrote it):CREATE PROCEDURE [dbo].[vsp_mail_select]@user_id int,@folder_id int,@is_read bit = 1, --IF 1, pull everything, else just pull unread mail@start_index int = null, --unused for now, we return everything@total_count int = null output, -- count of all mail in specifiedfolder@unread_count int = null output -- count of unread mail in specifiedfolderASSET NOCOUNT ONselect m1.* from mail m1(nolock) where m1.user_id=@user_id andfolder_id=@folder_id and ((@is_read=0 and is_read=0) or (@is_read=1))orderby date_sent descselect @total_count = count(mail_id) from mail m1(nolock) wherem1.user_id=@user_id and folder_id=@folder_id and ((is_read=0 and@is_read=0)or (@is_read=1))select @unread_count = count(mail_id) from mail m1(nolock) wherem1.user_id=@user_id and folder_id=@folder_id and is_read=0GOI was monitoring server for a couple of day before and I am not surewhythis happens every 3-4 days only!Any help on this matter would be greately appreciated!Thanks,Igor
Hi All,I have a table that holds pregenerated member IDs.This table is used to assign an available member id to web sitevisitors who choose to register with the siteSo, conceptually the process has been, from the site (in ASP), to:- select the top record from the members table where the assigned flag= 0- update the row with details about the new member and change theassigned flag to 1- return the selected member id to the web pageNow I'm dealing with the idea that there may be brief, high trafficperiods of registration, so I'm trying to build a method (storedprocedure?) that will ensure the same member id isn't returned by theselect statement if more than 1 request to register happens at thesame instant.So, my question is, is there a way, once a record has been selected,to exclude that record from other select requests, within the boundsof a stored procedure?ie:- select statement is executed and row is instantly locked; any otherselect statement running at that exact moment will receive a differentrow returned and sill similarly lock it, ad nauseum for as manysimultaneous select statements as take place- row is updated with details and flag is updated to indicate themember id is no longer unassigned- row is released for general purposes etcIf what I'm suggesting above isn't practical, can anyone help meidentify a different way of achieving the same result?Any help immensely, immensely appreciated!Much warmth,Murray
I want to lock a table so others cannot lock it but able to read it inside transactions.
The coding I need is something like this: set implicit_transactions on begin transaction select * from table1 with (tablock, holdlock) update table2 set field1 = 'test' commit transaction commit transaction
I have tried the coding above, it won't prevent others from locking table1.
So, I changed the tablock to tablockx to prevent others from locking table1. But this will also prevent others from reading table1. So, how can I lock table1 so others cannot lock it but still able to read it?
I have a table name stored in a scalar variable (input parameter of my stored procedure). I need to run SQL statement: SELECT COUNT (*) FROM MyTable and store the result of my query in a scalar variable:
For example:
declare @countRows int
set @countRows = (select count(*) from MyTable)
The problem is that the name of MyTable is stored in the input variable of my stored procedure and of corse this does not work:
declare @countRows int
set @countRows = (select count(*) from @myTableName)
I also tried this:
declare @sqlQuery varchar(100)
set @sqlQuery = 'select count(*) from ' + @myTableName
set @countRows = exec(@sqlQuery)
But it looks like function exec() does not return any value...
Simple example: declare @tTable(col1 int) insert into @tTable(col1) values (1) select * from @tTable
Works perfectly in SQL Server Management Studio and the database connection is OK to as I may generate PP table using complex (or simple) queries without difficulty.
But when trying to get this same result in a PP table I get an error, idem when replacing table variable by a temporary table.
Message: OLE DB or ODBC error. .... The current operation was cancelled because another operation the the transaction failed.
Here is the scenario, I have 2 stored procedures, SP1 and SP2
SP1 has the following code:
declare @tmp as varchar(300) set @tmp = 'SELECT * FROM OPENROWSET ( ''SQLOLEDB'', ''SERVER=.;Trusted_Connection=yes'', ''SET FMTONLY OFF EXEC ' + db_name() + '..StoredProcedure'' )'
EXEC (@tmp)
SP2 has the following code:
SELECT * FROM SP1 (which won't work because SP1 is a stored procedure. A view, a table valued function, or a temporary table must be used for this)
Views - can't use a view because they don't allow dynamic sql and the db_name() in the OPENROWSET function must be used. Temp Tables - can't use these because it would cause a large hit on system performance due to the frequency SP2 and others like it will be used. Functions - My last resort is to use a table valued function as shown:
FUNCTION MyFunction ( ) RETURNS @retTable ( @Field1 int, @Field2 varchar(50) ) AS BEGIN -- the problem here is that I need to call SP1 and assign it's resulting data into the -- @retTable variable
-- this statement is incorrect, but it's meaning is my goal INSERT @retTableSELECT *FROM SP1
But now I am getting error "General Network Error. Check your network documentation" after specifying Use existing stored procedure in TableAdpater Configuration Wizard.
ALTER PROCEDURE dbo.Insert_MailSignature( @Singnature image )
AS
SET NOCOUNT OFF;
INSERT INTO MailsSignature (Singnature) VALUES (@Singnature);
SELECT Id, Singnature FROM MailsSignature WHERE (Id = SCOPE_IDENTITY())
For testing I created a desktop application and found that the same Code, same(Use existing stored procedure in TableAdpater Configuration Wizard) and same stored procedure is working fine in inserting image into the table.
I have one procedure that gets executed many times per day(thousands at least). I consistently get blocking in my database, as users compile this stored procedure. How can I keep this from recompiling all the time, and bogging down my database? I tried the keep plan option in the portion of the code that uses tembdb, and that doesn't work. thanks.
Hi, How can I store a stored procedure's results(returning dataset) intoa table?Bob*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
Hi, I am having 2 tables. One is main table and another is history table. Whenever I update the main table, I need to insert the all the main table data to History table, before updating the main table. Overall it is like storing the history of the table updation. How do i write a stored procedure for this? Anybody has done this before? Pls help me.
When I run the SQL Profiler to detect lock escalation, I noticed it detected a lot of lock escalation with the textdata indicating "create procedure" on certain stored procedure.
To all, When a stored proc is executed in SQL server 2000, it is holding a EXCLUSIVE [COMPILE] lock on the proc and the proc os getting recompiled every time it is executed. This is happening with most of the procs that are called from this proc. When multiple users are executing the same process they are having to wait until the other users are done compiling the procs. The lapse time is growing exponentially with multiple users.
I have looked at several places to find a solution for this. Microsoft Articles Q243586 and Q263889 have provided me with some options; but at this point, I need a miracle.
All these procs users temp tables. I have got the code changed to replace most of them with Table datatypes (on SQL2K only) . Some of them still need to use temp tables as they are cross referenced by multiple procs.
I am hopeful, there is some one out there who has dealt with this kind of situations before. Any ideas/sugessions are greatly appreciated..
Hello:I run one process that calls the following the store procedure andworks fine.create PROCEDURE sp_GetHostSequenceNumASBEGINSELECT int_parameter_dbf + 1FROM system_parameter_dbtWHERE parameter_name_dbf = 'seqNum'UPDATE system_parameter_dbtSET int_parameter_dbf = int_parameter_dbf + 1WHERE parameter_name_dbf = 'seqNum'ENDGOIf I run two processes that call the above store procedure, I mightoccasionally get the dirty data of int_parameter_dbt. I guess that iscaused by two processes accessing to the same resource simultaneously.Is there any way to lock the store procedure call from MSSQL Serverand allow only one process to access it at a time?Thanks for help.Best Jin
Error: The Script returned a failure result. Task SCR REIL Data failed
OnError - Task SQL Insert Error Msg Error: A deadlock was detected while trying to lock variable "System::ErrorCode, System::ErrorDescription, System::ExecutionInstanceGUID, System::StartTime, User::FEED_ID, User::t_ProcessedFiles" for read access. A lock could not be acquired after 16 attempts and timed out. Error: The expression ""EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"" on property "SqlStatementSource" cannot be evaluated. Modify the expression to be valid.
Warning: The Execution method succeeded, but the number of errors raised (4) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.
And how did I get 4 errors? - I only set my script task result to failure
Hi, I am having a SP which returns two Rowsets: create proc GetSalesDetails as select CustName, ProductPurchased from Customers where PurchaseDate > '10/10/2006' select ProductName from Products where SalesDate > '10/10/2006'
Now in my code when I am filling the Dataset using this SP then it is giving the Table Names as "Table" and "Table1". Is there any way to get the actual table names respectively?
How can be used in a stored procedure the name of a table that was passed as a varchar parameter? The table name must be used in the "from" clause of a "select" statement without calling the "EXECUTE" or "sp_executesql". Is it possible? Marius G.
Hello, I have one store procedure that writes something data to one physical sql table 'MyTable' and on beginning I first call:DELETE FROM MyTableProcedure returns at the end data from 'MyTable' as on SELECT. PROBLEM:I started SQL Manager on my Laptop and on Computer near me and all pointed to same database (on Server) and I run that procedure simultaneously on Laptop and Computer at the same time (two hands on F5 button on these computers). Occasionally when clicking with both hands at the same time I got no records at the end of execution (on both computers), otherwise I got the results.WHAT I THINK IS PROBLEM:Somhow one SP start working and it did not come to the end and another computer called this SP and execute first command (DELETE FROM MyTable) and I got empty records at the end..WHAT I NEED:I need to prevent this situation to get empty records. All computers must get these records always. How I can use some sort of LOCKs to do this?Or to do that on C# application level using LOCK command? Thanks in advanceAleksandar
Hi all - I'm trying to optimized my stored procedures to be a bit easier to maintain, and am sure this is possible, not am very unclear on the syntax to doing this correctly. For example, I have a simple stored procedure that takes a string as a parameter, and returns its resolved index that corresponds to a record in my database. ie exec dbo.DeriveStatusID 'Created' returns an int value as 1 (performed by "SELECT statusID FROM statusList WHERE statusName= 'Created') but I also have a second stored procedure that needs to make reference to this procedure first, in order to resolve an id - ie: exec dbo.AddProduct_Insert 'widget1' which currently performs:SET @statusID = (SELECT statusID FROM statusList WHERE statusName='Created')INSERT INTO Products (productname, statusID) VALUES (''widget1', @statusID) I want to simply the insert to perform (in one sproc): SET @statusID = EXEC deriveStatusID ('Created')INSERT INTO Products (productname, statusID) VALUES (''widget1', @statusID) This works fine if I call this stored procedure in code first, then pass it to the second stored procedure, but NOT if it is reference in the second stored procedure directly (I end up with an empty value for @statusID in this example). My actual "Insert" stored procedures are far more complicated, but I am working towards lightening the business logic in my application ( it shouldn't have to pre-vet the data prior to executing a valid insert). Hopefully this makes some sense - it doesn't seem right to me that this is impossible, and am fairly sure I'm just missing some simple syntax - can anyone assist?
Hi guys I have a stored procedure that a make crosstab table , In this table the main column is "job titles" these jobs must be ordered in certain way , for example "1st managers then engineers … workers … " so In the table that job titles are defined there is also a column named "Ranking" so the" job titles" could be sorted appropriately by ranking order . The problem is I cannot have the "Ranking" column with my crosstab table so I need to load it in a view or something like that. Any Idea?
Hi.....I have problem and I need your helpI stored a procedure in the Projects Folder in my computerand I want to return the procedure result in a column inside tableHow I can do that?????????thank you
Hi, how do I loop through a table in a store procedure? I need to check the all the record in a table and do some logic and then insert or update another table base on the logic?
I've got a stored procedure which should update a table (add new customer record) When I run it locally everythings fine,
Since uploading it all to the web it no longer seems to add a new record, I've debugged it and it seems that the output parameters is set to nothing.
I believe it's a permissions issue but the user i'm using has full access to both the table and permission to execute the stored procedure is there any error handling I can do to capture the exact error? the code I use to execute the sProc is below
I need to use a stored procedure that will create a table. The table name must be passed to the stored procedure. This is what I have so far, but it does not allow me to run it.
alter procedure dbo.createNewBUtable ( @BU as varchar(50) ) as set nocount on; create table @BU ( BUid varchar(50) primary key, BUinfo varchar(50) )
Hi, I need to be able to create a Stored Procedure that gets its information based on dates stored in another table.Does anyone have an idea on how I can acheive this??Regards..Peter.
