DB Engine :: Server 2014 Wrongly Updated Due To Concurrency
Sep 22, 2015
Account getting wrongly updated due to concurrencyWe are using Sql 2014 and storing data in customer_account table for customer account details however we are experiencing wrong value insertion during concurrency ..pls find the code
Declare @date datetime2(7)
Declare @InsDate datetime2(7)
SELECT TOP 1 @Amountremaining =Remaining ,@Date=Datetime                                                           Â
 FROM <customertaccounttable>                                                             Â
Â
[code]....
I'm working on databases where statistics of some indexes (tables) are changing too frequently. Once I update them manually, one minute after they get 10-20% change, and five minutes after they get over 100% change. Tables get updated very frequently (multiple times in a second).
When I run a query to read from sys.stats, sys.dm_db_stats_properties and other dynamic views, I see that they were last updated when I did it manually, but the change rate overpassed the 500+20% (tables have multiples of 10K rows). Auto create and update statistics are set to true on all databases, and I don't know why sql server does not do that automatically.
We installed SP1 for SQL Server 2014 this past weekend and got this error message in the logs. I found that if you set the db to read-write, it updates the system objects, even after SP1 has completed. Then you can set it back to read-only. I'm just posting this so other people can find it on the internet, as I wasn't able to find it specifically.
Error Log Entry:System objects could not be updated in database 'x' because it is read-only.
Problem: After installing SP1 for SQL Server 2014 you will find this message in the error logs saying read-only databases could not be updated.
Solution: Simply set the db to read-write and the system objects will get updated, long after SP1 was installed.
ALTER DATABASE [x] SET READ_WRITE WITH NO_WAIT
Then set it back to read-only:
ALTER DATABASE [x] SET READ_ONLY WITH NO_WAIT
You should then see these log entries:
System objects could not be updated in database 'x' because it is read-only. Setting database option READ_WRITE to ON for database 'x'. Starting up database 'x'. CHECKDB for database 'x' finished without errors on 2015-07-25 01:02:28.143 (local time). This is an informational message only; no user action is required. Synchronize Database 'x' (129) with Resource Database. Setting database option READ_ONLY to ON for database 'x'. Starting up database 'x'. CHECKDB for database 'x' finished without errors on 2015-07-25 01:02:29.888 (local time). This is an informational message only; no user action is required.
I have TSQL query using UNION ALL. First subset returns 92 rows, second subset return 0 (ZERO) rows. Now if I execute them separately they execute subsecond. If I put UNION ALL between them then it hangs forever exactly on 88s row.
I understand I need to provide execution plans, actual queries etc but before going into all this details, why on earth even in theory UNION ALL with empty result will result in a hang of the first subset?
Based on estimated execution plan 2 subqueries are performed in parallel and then CONCATENTION is being used which shall result with just first subset immediately displayed in result.
Estimated execution plan attached, I can not get actual execution plan because query never completes.
We are collecting values in a string format with delimeteres and sending to DB .We would like to insert the data in Bulk insert format rather than splitting the same and then inserting..
In sql 2014 can we archive the same..sample format currently we are getting the client is like this is
Saleid$ salename$month$year$totalsale#Saleid$salename$month$year$totalsale# has a dataset.
The SQL Server Agent (MSSQLSERVER) service on server started and then stopped. If i Manually start the services also SQL Server Agent services are stopping automatically.Though I selected Auto Restart SQL Server Agent if it stops unexpectedly, The services are stopping automatically.TCP/IP protocol was enabled for port 1433.Are there any setup I missed?
1. I created a maintenance plan using Visual Studio 2013 (nothing fancy pretty basic) 2. Using ssms 2014 I imported it (the dtsx file) under the Integration Services and it appeared there successfully 3. I connected to the Database Engine again using ssms 2014 - my expectation was to see it under the Management > Maintenance Plans folder but it was not present.
I have been using the SSIS Log Provider for SQL Server quite a lot this year with little to no problems. Recently however as I edit or create packages the logging seems to keep going to the master.dbo.sysdtslog90 table as opposed to the [db].dbo.sysdtslog90 as setup in the package. I tried totally deleting the connection from the package and recreating and still had the problem.
Is there some setting on the SQL server itself that can cause this? Our "dba" likes to make changes without letting anyone know about them.
We recently had an issue with SQL Server's performance. We have a server with multiple databases that are accessed by several different applications. When a query was issued to one table on a database (40 million rows), it brought the entire server to its knees. This impacted the other application accessing the database.
The query issued was on a varchar column using a like in the where clause. An index did exists on the table but because of the like clause it didn't want to use the index and proceeded to do a table scan. I understand that tablescans are going to have to happen no matter what sometimes, but why did it hurt the entire server's performance. Any ideas? I'm open to all suggestions. I might be the one doing something wrong and appreciate any advise.
I have a database in sql server 2000. In this i have used identity(seed,increment) property so that unique ids may be available. Now if requests from diffrent users arrives at same time on the server, will there be a conflict because of ids?
I'm currently looking at a multi-user app that has an Access 97 frontend and an SQL2K backend. Proposed changes to the system mean that the user concurrency count is likely to increase dramatically, and I'm wanting to know if there are any limits to the concurrency for this architecture.
I'm using Java to connect to a SQL Server 2000 database. I connect using the Driver Manager with Sun's odbc driver ( sun.jdbc.odbc.JdbcOdbcDriver ) or I can use the jdbc driver provided by Microsoft (com.microsoft.jdbc.sqlserver.SQLServerDriver)
The Java application makes 1 Connection.
Within the database there exists a stored procedure that updates 2 Tables. The tables have a fixed number of rows that get updated continuously by calls to this stored procedure.
The Java application has a thread pool of 15 threads that create 15 CallableStatements (1 per thread) using the same instance of the Connection object.
According the the Microsoft JDBC driver docs, 1 Connection with multiple calls to the Callable statements is how it's supposed to be done. The following is an excerpt from Microsoft's "SQL Server 2000 Driver for JDBC User’s Guide and Reference" (page 86) regarding Connection Managment: Managing Connections
Connection management is important to application performance. Optimize your application by connecting once and using multiple statement objects, instead of performing multiple connections. Avoid connecting to a data source after establishing an initial connection. This is precisely what I'm doing, but I do not know if the the stored procedures are being run concurrently, the documentation does not tell me.
So my question: What is happening inside SQL Server 2000?
Hi,I want to save the last modification date when the row is updated. I have a column called "LastModification" in the table, every time the row is update I want to set the value of this column to the current date. So far all I know is that I need to use a trigger and the GetDate() function, but could any body help me with how to set the value of the column to getdate()? thanks for your help.
I have recently upgraded from SQL 2000 to SQL 2005 and I'm getting the following problem, can you suggest me if this is a issue with SQL 2005 or suggest me an asnwer for this.
Below is the exception from my log file
The cursor type/concurrency combination is not supported. com.microsoft.sqlserver.jdbc.SQLServerException: The cursor type/concurrency combination is not supported. at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerStatement.<init>(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.<init>(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.prepareStatement(Unknown Source)
The following is the piece of code where the problem I'm assuming is happening, how can I correct it.
I have three variables that are stored in an SQL Server configuration table. When I execute the package, they do not seem to be getting updated. At what point do the configurations get loaded?
I been asked recently in the interview thatHow can I detect changes automatically in the SQL Server Database when anything is updated, deleted or inserted?if anyone can help me in this that will be really great. I dont actually know whether I can ask this here but I wanted to know the answer for this and thought this might be right place to ask? sorry if I am wrong? Thanks in Advance
Client issues query which sends out individual requests to the 2 OLAP servers that are load balanced. The client evaluates the versions of the returned record sets to ensure the consist data being returned for one single query. Otherwise, this error will be seen:
The cube has been updated by the server the data is now obsolete.
These servers sit behind a cisco 11506 CSS with load balancing based on balance type: least busy server, also persistence based on cookies.
My developer says this worked fine for a long time then just 'started happening'.
We are getting data feed from Oracle database in our project. Everyday we will need to track if any rows got inserted/updated/deleted in the source and get that update right into our data warehouse.
Currently we are taking a dump of the required table (as it is) to our staging DB and comparing it with previous day data to track the changes (column by column comparison). This approach is working currently but has performance bottleneck. There is no tracking column (eg. last modified date or time) in source that will give us any idea of what got changed. Also there is no identity key or primary key in the source data.
Is there a way in SQL Server to get that inserted/updated records only instead of comparing column by column to track the changes?
currently i m developing a web application with using sql server 2005 and i was testing yesterday a sql update query with sql server management studio. in my update query i forgot to put where condition and now all the rows of table are updated. is there any solution to undo this and retrieve all rows back? Regards Selena
Dear friends, We have a server put at US side and we are trying to load the data into another related database in India site, now the thing is that we want to update India data at an interval of 5 mins?
Is there any way to do it without effecting the performance of the US server?
I am trying to change values of two tables in my sql server 2000 database. When one of the tables is modified in some way like adding/updating a record, I need a trigger procedure to copy this new data from the first table to the second. Problem is, how do I get the newly inserted or updated data from the first table? How do I specify that I only want the data which caused the trigger to execute? Anyone know?
I am trying to create an aggregate table where the value is a rolling sum. Type a on date 1 is the sum of the values in the main tbl. Type a on date 2 is the sum of values for type a on date 1 and date 2. Is this possible? I have been trying update t sql with sum(case where date <= date) statements but can't get it to run.
create table main_table (type nvarchar(10), date int, datavalues int); insert into main_table values('a', '1',3); insert into main_table values('b', '1',4)
I have a table with constantly changing data - stock.
I want to start monitoring the value of stock at the end of each month. I can do this with a simple query, export the results to Excel and store on the network.
My question is:
Are there better ways to do this with SQL Server?
I thought of a monthly "job" that does the query and outputs to a file. (Need to be able to look at each month separately though for trend monitoring.)
Then wondered, if I should have an extra table to store the data and write queries on that in the future?
I was wondering, is it really true that in Sql Server 2005, there is no updated date -property for stored procedures? There is a created date -property, but it's not useful, because stored procedure's get updated often. This is a huge disadvantage for me, and I was really waiting for ms to fix this problem after sql server 2000, but no. Does anyone figured out any solution to this problem?
I wanted to know if it is possible to run a stored proc (report) when a new record is inserted / updated into a certain table. Also if it could do so for records with a column that meet a certain criteria ie. sell description like '%test%'
I am looking to created a trigger that inserts records into a log table to show the stored porcedure that has updated a specific column to a specific value in a specific table
At present I have:
CREATE TRIGGER [dbo].[trUpdaterTable] ON [dbo].[t_account]-- A DB level trigger FOR UPDATE --Event we want to capture AS IF update (document_status)
[Code] ...
However this doesn't appear to bring back the procedure that triggered the update...
The value the trigger should update on is document_status = 0
Hi everybody,I need to understand how concurrency excatly work in asp.net. For example, I'm confused what happens if two users at the same time try to access the same record in a table or even the same variable. Do ASP.NET handle this , I mean by locking one user and letting the other to have access OR it's up to the programmer to write some code to lock shared resources such as database , objects and variables?If it's up to the programmer to do this task, I appreciate if you can show me an example that clarifies that.Thank you
