Single Sql Connection, Several Transaction At Same Time?
Nov 30, 2006Hi Friends,
Is it possible to create single sql connection and running several transaction at the same time? If so, can you explain?
Thanks.
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Problem With Getdate() In Transaction Takes The Insert Time Instead Of The Commit Time
Nov 12, 2007Hi,
We need to select rows from the database that have been recently inserted/updated. We have a main primary table (COMMIT_TEST) and a second update table (COMMIT_TEST_UPDATE). The update table contains the primary key and a LAST_UPDATE field which is a datetime (to tell us when an update occurred). Triggers on the primary table are used to populate the update table.
If we insert or update the primary table in a transaction, we would expect that the datetime of the insert/update would be at the commit, however it seems that the insert/update statement is cached and getdate() is executed at the time of the cache instead of the commit. This causes problems as we select rows based on LAST_UPDATE and a commit may occur later but the earlier insert timestamp is saved to the database and we miss that update.
We would like to know if there is anyway to tell the SQL Server to not execute the function getdate() until the commit, or any other way to get the commit to create the correct timestamp.
We are using default isolation level. We have tried using getdate(), current_timestamp and even {fn Now()} with the same results. SQL Queries that reproduce the problem are provided below:
/* Different functions to get current timestamp all have been tested to produce the same results */
/*
SELECT GETDATE()
GO
SELECT CURRENT_TIMESTAMP
GO
SELECT {fn Now()}
GO
*/
/* Use these statements to delete the tables to allow recreate of the tables */
/*
DROP TABLE COMMIT_TEST
DROP TABLE COMMIT_TEST_UPDATE
*/
/* Create a primary table and an UPDATE table to store the date/time when the primary table is modified */
CREATE TABLE dbo.COMMIT_TEST (PKEY int PRIMARY KEY, timestamp) /* ROW_VERSION rowversion */
GO
CREATE TABLE dbo.COMMIT_TEST_UPDATE (PKEY int PRIMARY KEY, LAST_UPDATE datetime, timestamp ) /* ROW_VERSION rowversion */
GO
/* Use these statements to delete the triggers to allow reinsert */
/*
drop trigger LOG_COMMIT_TEST_INSERT
drop trigger LOG_COMMIT_TEST_UPDATE
drop trigger LOG_COMMIT_TEST_DELETE
*/
/* Create insert, update and delete triggers */
create trigger LOG_COMMIT_TEST_INSERT on COMMIT_TEST for INSERT as
begin
declare @time datetime
select @time = getdate()
insert into COMMIT_TEST_UPDATE (PKEY,LAST_UPDATE)
select PKEY, getdate()
from inserted
end
GO
create trigger LOG_COMMIT_TEST_UPDATE on COMMIT_TEST for UPDATE as
begin
declare @time datetime
select @time = getdate()
update COMMIT_TEST_UPDATE
set LAST_UPDATE = getdate()
from COMMIT_TEST_UPDATE, deleted, inserted
where COMMIT_TEST_UPDATE.PKEY = deleted.PKEY
end
GO
/* In our application deletes should never occur so we dont log when they get modified we just delete them from the UPDATE table */
create trigger LOG_COMMIT_TEST_DELETE on COMMIT_TEST for DELETE as
begin
if ( select count(*) from deleted ) > 0
begin
delete COMMIT_TEST_UPDATE
from COMMIT_TEST_UPDATE, deleted
where COMMIT_TEST_UPDATE.PKEY = deleted.PKEY
end
end
GO
/* Delete any previous inserted record to avoid errors when inserting */
DELETE COMMIT_TEST WHERE PKEY = 1
GO
/* What is the current date/time */
SELECT GETDATE()
GO
BEGIN TRANSACTION
GO
/* Insert a record into the primary table */
INSERT COMMIT_TEST (PKEY) VALUES (1)
GO
/* Simulate additional processing within this transaction */
WAITFOR DELAY '00:00:10'
GO
/* We expect at this point that the date is written to the database (or at least we need some way for this to happen) */
COMMIT TRANSACTION
GO
/* get the current date to show us what date/time should have been committed to the database */
SELECT GETDATE()
GO
/* Select results from the table we see that the timestamp is 10 seconds older than the commit, in other words it was evaluated at */
/* the insert statement, even though the row could not be read with a SELECT as it was uncommitted */
SELECT * FROM COMMIT_TEST
GO
SELECT * FROM COMMIT_TEST_UPDATE
Any help would be appreciated, we understand we could make changes to the application/database to approximate what we need, but all the solutions have identified suffer from possible performance issues, or could still lead to missing deals (assuming the commit time is larger than some artifical time window).
Regards,
Mark
SQL Server 2008 :: Displaying Transaction Time Punch Data In A Time Card Form?
Oct 7, 2015I have a table called employee_punch_record that we use to store employee time clock punches.
The columns are:
employeeid,
punch_timestamp,
punch_type (In / Out),
closed (bit used as status for open or closed pay periods),
ident
Here are some examples of a record:
bkingery62015-10-06 16:59:04.000In0
bkingery72015-10-06 16:59:09.000Out0
bkingery82015-10-06 16:59:13.000In0
bkingery92015-10-06 18:22:44.000Out0
bkingery102015-10-06 18:22:46.000In0
bkingery112015-10-06 18:22:48.000Out0
bkingery122015-10-06 18:22:51.000In0
tfeller52015-10-05 17:00:05.000In0
We are using SQL Server 2008 as our database and use Access as a GUI. I am looking to create a form in Access where employees can access their time card and request changes from management. I want to use the format from the attached screen shot for the form. I pretty much know how to do it all, the only point of complication is trying to figure out the easiest way to get the transaction punch record data on employee_punch_record into a format where I can easily populate the form in the horizontal format you see in the screen shot.
I am not super strong in SQL, but figure I can do it using a formatting table of some sort. quick and easy way to move transaction records into a more horizontally oriented record?
Using One Single-application Connection Vs. One Connection For Every Operation To SQL-Server Via ADO.NET
Aug 11, 2005Dear members,I'am thinking about the "best" way to connect to my sql-server viaADO.Net (if there is a best way).My application uses the sql-server very intensively. At the momentevery database-operation opens a connection, executes and then closesthe connection.Another way would be to use only a single connection to the database,which is opened when the application starts.What do you think is the better way to get a high performing sqlserver: using one single application connection vs. using oneconnection for every operation?Cheers, Sebastian
View 2 Replies View RelatedMultiple Process In A Single Transaction Using SB
Jul 21, 2006We have a scenarion in a batch job. There are 3 sp's which are executed for every record in a table. After the execution of first sp the second sp executes depending upon the result of first sp. Simillarly for 2nd and 3rd sp.
Now if any sp execution fails than the whole transaction for that record in the table has to be rolled back.
Can this whole process of executing the multplie sp's insides a single transaction be accomplished using service broker with either a single queue or multiple queues?
sp 1 (1 record)
__________ l_____________
l l l sp2 ( 3 records for 1 record in sp1)
Simillalry for the one record in sp2, sp3 executes for multiple records.
Or in other words if processing of any message in a queue fails all the messages that have been processed already shoould be rolled back and no further execution should happen?
Also i would like to know can a conversation group be rolled back if processing of any message in the conversation group fails. I am asking this as we can club sp2 and sp3 together to get the results directly and than try for parallel processing.
P.S. We have a multiprocessor 64 bit server.
thanks
Wrapping Query Batches In A Single Transaction.
Jul 23, 2005I have a query batch "update" script that upgrades my users database from,say version 0 to version 1, or from version 1 to version 2. I would like toknow how I can wrap the entire script in a transaction, so that either thewhole thing succeeds or none of it does.For example:BEGIN TRANSACTION.......... Alter some tables.....GO.......... Alter a stored procedure.....GO.......... Create a new stored procedure.....GOCOMMIT TRANSACTIONorROLLBACK TRANSACTIONGO(how do I get to the "ROLLBACK TRANSACTION" if an error occurs in the updatescript?)
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Feb 26, 2008
Hi All,
I want to know that how we will be able to update multiple rows in single transaction.
e.g If original database is
S_No Data
1 -
2 -
3 -
4 -
After
S_No Data
1 1
2 3
3 6
4 10
Handling SQL RollBack Transaction For More Records In A Single Process
Mar 6, 2008I have over 500 transaction records in a single DB process handling within SQL transaction (Begin, Commit, RollBack and End).
Is there any limitation for the following rollbacktransaction function to handle more records (eg. over 500 records)? Public Shared Sub RollBackTransaction()
Dim transactionObj As Object
Try
transactionObj = SqlTransaction.GetExistingTransaction
If (Not IsNothing(transactionObj)) Then
CType(transactionObj, SqlTransaction).RollBack()
End If
Catch ex As Exception
Throw New Exception(ex.Message)
End Try
End Sub
Transact SQL :: Table To Store All Transaction Happened On A Single Day
Jun 11, 2015I have a transaction table to store all the transaction happened on a single day. as per my requirement I wrote the query like this select Currency Code,TransactionCode,TransactionAmount,COUNT(TransactionCode) as [No. Of Trans] from TransactionDetails where TransactionCode in ('BNT' ,'BCN','BTC','STC','SCN','SNT') group by TransactionCode,CurrencyCode,TransactionAmount order by CurrencyCode..I got the result like this
My I want to show this result like this
ARS
BNT 0 0
BCN 0 0
SCN 1 12
BTC 0 0
STC 0 0
SNT 0 0
[code]...
and so on for all the the currency lists.how can I achieve like this .
Cannot Acquire A Managed Connection From The Run-time Connection Manager
Jul 26, 2006How would one go about using an ODBC connection with SSIS. I'm trying to ETL some Sybase ASE data, but I get the error when I try it:
"cannot acquire a managed connection from the run-time connection manager"
This wasn't any help:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=169777&SiteID=1
Display 20 Rows At Single Time
Sep 25, 2015The stored procedure takes ~ 10 seconds every call. The execution plan is Index seek or clustered index scan almost everywhere . No table spools or lazy loads or key lookups. Cannot share the code or execution plan due to company rules and regulations.Issue is that i am dealing with result set of around 50,000 records . Out of these i have to return 20 records at a single time (which is also customizable i.e 40 / 60/ 150 records in a page). Application cannot handle all 50k records so i have to return 20 records for every stored procedure call.
The result set changes as per the start date and end date which i recieve as parameters. In application there are few Column filters namely- Country(around 50 countries), Outcome(around 6 to 10 values ) . These filters will values in drop down( as excel ) depending on the distinct values in that columns. These filters will be populated on every page, if no filter value is selected.Issue is if user does sorting or filtering any records , this stored procedure is called and every time i have to deal with ~50000 records.
Current Code :
Step 1 ) Get the required result set in temp table .
Step 2) Compute the results on some business rules . (Outcome and SharesAvailable calculation - see attachment)
Step 3) populate filter Columns (Country,Outcome) these values will be comma seperated.
Step 4) Dynamic query to get required result set i.e if user wants only 10 records in single page then TOP 10 . Sorting can be applied on any column mentioned in screenshot.
Putting Multiple Xml Files Data Into Database In A Single Transaction
Sep 27, 2006First of all i do not know whether this is the right form to ask the question Let me describe the scenario iam using Iam generating xml files at a particular place and sending them to a server xml1|--------------------->dataset1------------------------------>adapter1.update(dataset1)xml2|----------------------->dataset2----------------------------->adapter2.update(dataset2)xml3|----------------------->dataset3------------------------------>adapter3.update(dataset3) all the three updates should happen in only one transaction if any one of the update fails then the transaction should rollbackcan anyone tell me a way to do iti am desperately in search of any ways to do it can anybody help please
View 2 Replies View RelatedHow We Can Insert Multiple Query With Transaction Roll Bck For A Single Record
Apr 11, 2008Hello,
I have problem for insert multiple query for insert in differenr tabels for a single record.
I have mail record for candidate and now i wants to insert candiate labour info, candidate passport detail in diff tabel like candidatLabour and candidatePassport,
i used two store procedure for it and i write code for it.and it works fine,but i think that if one SP executed and one record inserted but then some problem occure and 2nd SP not executed then...........
so plz help me
Thanks
How Do You Roll Back Transactions For A Single Table From The Current Transaction Log?
Nov 1, 2007
Goofed up and ran an update query. It messed up all the data in a single table. I'm trying not to restore the table from a previous backup since the backup is more than 20 GB. It's going to take forever to restore it. Any advice would be much appreciated!
Thanks!
Charles.
How To Access Database In Single User Mode All Time
Aug 23, 2004Dear All,
I want my SQL database to be accessed always in a single user mode through my application. How can I do this ?
Thanks in advance.
Sushma
SQL Server 2012 :: SELECT Query - Cursor To Display Result In Single Transaction
May 25, 2015Here the SELECT query is fetching the records corresponding to ITEM_DESCRIPTION in 5 separate transactions. How to change the cursor to display the 5 records in at a time in single transactions.
CREATE TABLE #ITEMS (ITEM_ID uniqueidentifier NOT NULL, ITEM_DESCRIPTION VARCHAR(250) NOT NULL)INSERT INTO #ITEMSVALUES(NEWID(), 'This is a wonderful car'),(NEWID(), 'This is a fast bike'),(NEWID(), 'This is a expensive aeroplane'),(NEWID(), 'This is a cheap bicycle'),(NEWID(), 'This is a dream holiday')
---
DECLARE @ITEM_ID uniqueidentifier
DECLARE ITEM_CURSOR CURSOR
[Code] ....
Reporting Services :: How To Delete A Single Record From 2 Tables At A Time
May 26, 2015How to delete a single record from 2 tables at a time.
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Nov 29, 2015I have a requirement to track the sqlserver when any DB changed from multiuser to singleuser.
I want to capture the date and time when anyone change any db from multiuser to single user and save this information in one text or csv file.
How can we do this using powershell?
Single Connection With SQL 7.0 Gateway
May 9, 2006Our company is using a development tool named eDeveloper.
This tool comes with a gateway for SQL 7.0
Since we upgraded to SQL 2005 the connection is limited to a single connection
Are there any setting that related to the number or type of connetctions for backward compatibility? (I have no problem openning multiple connection using VS 2005)
Transaction Log Growing All The Time
Apr 30, 2007Hi there,
We have a Principle, Mirror and Witness set-up and all is working fine, however, the transaction logs for a few large databases just keep growing over a the course of the month until the disk is full. As I understand it, and having tried you can't dump the transaction logs while mirroring is configured, is there any way at all to commit and truncate the logs while mirroring is running or do I have to manually remove the mirroring each month, dump the transaction logs and then re-enable it again after doing the backup/restore?
The databases in question are about 6GB in data size and the transaction logs can grow to be about 60GB in a month.
Would a normal SQL Server 2005 backup truncate the logs if I configured this? At the moment we use Litespeed for SQL server for nightly backups.
Any advice would be very helpful.
Thanks
Ed
Problems With Transaction Scope Time Out
Oct 2, 2007Hi, i'm trying to run wrap a transaction around a block of code to make sure every statement is carried out. Here's what i have:
using (TransactionScope ts = new TransactionScope())
{ ... ts.Complete();}The code executed in the ... part is a set of sql commands within my dal. If this above expression takes less than 30 seconds everything is carried out correctly, however if it takes longer than 30 seconds i receive an sql timeout error. I tried modify the above code to:
using (TransactionScope ts = new TransactionScope(TransactionScopeOption.Required, TimeSpan.FromMinutes(5)))
{ ... ts.Complete();}
But it did not seem to make a difference. I suppose the easiest option would be to increase the timeout for every sql command in my dal but i feel that the 30 second timeout is sufficient for a single command.
Appreciate if someone could tell me how this should be done correctly. Thanks
Transact SQL :: Calculating Transaction Time
Nov 23, 2015select TOP 10 rec_id,trans_id,number_id,card_no,message_id,trans_datetimefrom [dbo].[trans_log]
order by trans_datetime desc101, 1,34343, 99999, 200, 2015-11-23 12:27:25.710101,2,34343,99999,210,2015-11-23
12:27:26.710102,3,43434,88888,200,2015-11-23 12:28:26.714102,4,43434,88888,233,2015-11-23 12:28:27.710expected result:34343,99999,datediff(ss,'2015-11-23 12:27:26.710','2015-11-23 12:27:25.710') --difference between row 2 and row 143434,88888,datediff(ss,'2015-11-23 12:28:26.714','2015-11-23 12:28:27.710') --
difference between row 4 and row 3difference between row 6 and row 5...In the above query, I always want to find the difference in transaction date time between second and first row in a moving window.I have the unique id as rec_id to compare the next row with the previous row.
Mulitple Database Connections Vs Single Connection?
Apr 16, 2008I have a DLL that acts as an interface between the application and the database. So you create a new instance to the database via:
MyDatabaseClass db = new MyDatabaseClass()
Each instance of the class creates a new connection to the database.
So if I were to have the following, then 4 connections would be made.
MyDatabaseClass db1 = new MyDatabaseClass()
MyDatabaseClass db2 = new MyDatabaseClass()
MyDatabaseClass db3 = new MyDatabaseClass()
MyDatabaseClass db4 = new MyDatabaseClass()
My question is...What if instead of creating new connections upon each instantiation, I re-use the same connection through a "ConnectionManager" class. In this way, the above code will only create 1 connection instead of 4.
What do you guys think about each approach? Obviously the 2nd approach makes sense for non-web applications, but what about websites? Would that just cause that single connection to be overloaded??
Thanks for any insights.
SQL 2012 :: Read Response Time Transaction Log
Apr 15, 2014We have poor performance spikes on a drive containing our log file but this is only for reads and seems to be at a time when we run a re-index job. If this is a likely correlation as to poor performance in reading the log file, and what reads are done from a log file.
View 2 Replies View RelatedTransaction Log Backup Taking A Long Time
Mar 30, 2007Hello,
I'm trying to figure out why my transaction log backup is taking up to an hour to complete. I started off with a full recovery model with a Full database back up every Sunday, differential backups every Tuesday/Thursday and log backups every 5 minutes. I would have thought that the log file backups would execute much quicker because I'm backing them up more often.
Here is my backup statement, I'm hoping I've got a wrong option that you can point out to me:
BACKUP LOG [xxxx] TO [LogFilexxxxBackups] WITH NOINIT , NOUNLOAD , NAME = N'xxxx log backup', SKIP , STATS = 10, NOFORMAT
Set A Variable To Datetime And Time To Exact Milliseconds In SQL Server In Stored Procedure AS A Single String
Nov 1, 2007I need to set a variable to datetime and time to exact milliseconds in SQL server in stored procedure.
Example:
set MyUniqueNumber = 20071101190708733
ie. MyUniqueNumber contains yyyymmddhhminsecms
Please help, i tried the following:
1. SELECT CURRENT_TIMESTAMP; ////// shows up with - & : , I want single string as in above example.2.
select cast(datepart(YYYY,getdate()) as varchar(4))+cast(datepart(mm,getdate()) as char(2))+convert(varchar(2),datepart(dd,getdate()),101 )+cast(datepart(hh,getdate()) as char(2))+cast(datepart(mi,getdate()) as char(2))+cast(datepart(ss,getdate()) as char(2))+cast(datepart(ms,getdate()) as char(4))
This one doesnot display day correctly, it should show 01 but shows 1
Recovery :: Read-only Routing With Single Application Connection?
Nov 30, 2015My application supports a single database connection and in the app console I can produce reports. If I include the app database in an AlwaysOn availability group with a read-intent replica will SQL automatically route the “selects” to that second instance thus offloading my application’s reporting activities or I need a separate db connection (maybe from a reporting app or cli) with a connection specifying read-only intent?
View 4 Replies View RelatedProcess Or SQL Transaction Takign Memory And Processor Time
Mar 22, 2002Hi,
While watching through performance monitor the processor time often goes high above the memory.
Could you please tell me how to find out which process is doing that.
Thanks
John Jayaseelan
URGENT !!!! Transaction Log Backup Running Longer Time
Dec 26, 2002Hi Guys,
We have a database with 20 gig and with huge transactions. The transaction log backup is scheduled every one hour
from 3.00 AM to 9.00 PM.
We take a full backup in the disk at 9.00 PM and again a full backup in the tape at 2.00 AM
It works fine in the day from 6.00 AM and complete within seconds and the size is approx. 50 to 200 MB.
But the very first transaction log backup at 3.00 AM is running like 3 hrs and the size is approx. 11 gig whick is almost equivalent to the Full backup size. There are some dts packages that are running in the night and as usual reindex, intergrity checks are running and there no large user traffic during night. But I have no idea which the very first transaction log backup in the morning takes longer time and has this bug size. Is there any work around to fix this proble.
Please advise.
Thanks,
Anu
Multi-thread Tasks Using A Single Connection Object Concurrently
Jul 20, 2005is it possible to use a single connection object shared by severaltasks where each task is handled by a thread? these tasks call storedprocedures that return record sets, no editing, update or delete.my objective is that db connection is expensive and each user can onlyhave 1 connection object. each user submits a request to the webserver, and the result web page construction consists of a number ofresult sets obtained from several stored procedure from the samedatabase instance.i could obtained my result sets by making each sp call one at a timebut was thinking whether i could instead break up the tasks, create athread for each task that shares the same db connection objectconcurrently. the connection object will be alive until all tasks arecompleted, that is if the final object ive could be achieved in ashorter time. No connection pooling here.i am wondering over questions like:1. within the same db instance, if 2 stored procedures need to accessthe same table, does SQLserver queue-up and service one request at atime.2. would there be any problem using the connection object this way,sharing between multiple theads?3. is it possible that a 'dead-lock' may occur within the DB?of cos this whole idea can be absurd and into the trash if theconnection object doesn't support multi-thread and is queue based inthe first place.pardon me if my SQL server basics is off track. been doing too manyother things.thanks,meng
View 2 Replies View RelatedContext Connection Transaction
Feb 24, 2006Hello Guys,
I need some some clarifications on how Context connections and transactions inter operate in CLR.
The context connection allows for ADO objects to be " running in the same transaction space". So the association to the current transaction is implied. So as long as I set for example my SqlCommand to use the context connection I am going to be running under the same transaction.
SqlConnection sqlConn = new SqlConnection("context connection=true");
SqlCommand sqlComm = new SqlCommand("EXEC myCommand", sqlConn);
I guess my ambiguity comes from the fact that the Transaction is not specifically specified.
In addition what happens upon a trigger that for example watches and insert on a table? If the insert occurs under a transaction, I would assume that I will be also picking up that transaction in the CRL Trigger, thus the whole operation would seem atomic.
Thank you,
Lubomir
Reading Multiple Worksheets From A Spreadsheet With A Single OLEDB Connection Manager(Excel).
Oct 4, 2007
Hi all,
Any idea about how to configure/read multiple worksheets from a spreadsheet using single connection manager?
I think using SQL Command we could able to do - not sure how to achieve that. Let me know the other alternatives too.
Thank you for any help
- Chennoju
Rollback Transaction After Connection Lost
Feb 8, 2006Hi,I have a problem. When my computer loses connection toserver during transaction it is rolled back automaticlyby server after 2-5 minutes. During the time a can resetmy computer, run my program again and I can seedata from not commited transaction becouse I have toset isolation level to read uncommited.How to force the server immediately rollback transaction?TIAclint
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