All versions of Microsoft SQL Server (not MySQL). Please also add a version-specific tag like sql-server-2016 if that is relevant to the question.

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6
votes
1answer
832 views

Guarantee SQL Server Identity Columns that two consecutive values differ by constant increments?

I posed a question about Denali sequences here and another question about emulation of identity columns in Oracle Global Tables here. I always thought that I could trust that identity values ...
4
votes
1answer
1k views

Are we required to handle Transaction in C# Code as well as in Store procedure

Do we really require transaction handling in c# as well database store process both side C# Using(transaction with transaction scope) { Execute store proc; Transaction. Complete; } SQL ...
4
votes
6answers
17k views

SQL Server log shrinking Issue [duplicate]

Possible Duplicate: Why Does the Transaction Log Keep Growing or Run Out of Space? I have a 300 GB database log in our SQL Server. I want to shrink all the logs but it is not allowing me to ...
4
votes
3answers
7k views

How to move data from big table

There is a big table (5-6 million records). I have to move 90% of old records to other database(table). Solution?
3
votes
2answers
2k views

Error: Cannot Generate SSPI context

When someone tries to connect to a SQL Server instance, the error shows up: It's not possible do generate SSPI context. Yesterday we had a blackout (don't know how to say this expression in ...
3
votes
1answer
157 views

Analysing A Query Plan

Why is the following query slow? select count(*) from [dbo].[mt_dispatch_link] , [dbo].[_mt_dispatch] [_mt_dispatch] where (mt_dispatch_link.contract_id_1 = _mt_dispatch.contract_id ...
3
votes
2answers
15k views

SQL query that concatenate values from duplicate rows in a single table

Lets say I have a table of employees, like this: Name Sex Role Bob M Developer Joe M QA Now, I have a problem with this table of duplicated rows. I will fix it ...
2
votes
5answers
6k views

Autogrowth - Percentage Use?

Is it best not to use Percentage file growth for autogrowth settings? The below recommends using percent value growth for databases under 500GB but is this recommended? ...
2
votes
3answers
40k views

SQL Server 2008 R2 High memory usage

I have SQL Server 2008 R2 that runs multiple jobs over night, the problem is SQL Server will eat up all RAM and CPU, then it will not release the RAM resources after the job finishes, as a workaround ...
8
votes
2answers
3k views

How to backup/restore SQL Server database from command line similar to mysql

I need to automate the migration for some databases from an older server. I know that script a tool using C# for example can be a possibility but I need a simple, fast and effective solution in order ...
8
votes
2answers
584 views

Mirroring the Distributor

Has anyone had success with mirroring the distribution database? We have a dedicated server as a Distributor. It handles all our push replication from prod to reporting. We'd like to build an ...
7
votes
1answer
263 views

Query optimizer recommends adding index instead of using existing index

I am trying to determine why the query optimizer in SQL Server is recommending creating a new index instead of using an existing index that appears to be sufficient for the query. First the table. ...
4
votes
1answer
191 views

MS SQL Server CPU load goes up dramatically when turning on 2014 features by setting compatibility level

I'm running some Microsoft SQL Server 2014 load testing on a decently spec'ed machine. I'm certainly not an expert on the SQL Server tuning specifics, but with the bits an pieces I've gathered from ...
4
votes
2answers
27k views

Copy a large data from sql query result

In my sql server 2008, after running the query the data return is very huge say in millions. I tried copying but it gives an exception sql memory error. Can you let us know how can i copy the entire ...
4
votes
2answers
1k views

How can I find databases with a large number of virtual log files?

I have several databases on a production server that are in the hundreds of gigabytes, and have many thousands of transactions running through them on a daily basis. Almost all these databases are ...
4
votes
1answer
2k views

Running queries with SQLCMD vs. Running queries with SSMS

I've noticed something which i'm not sure about. can it be that running queries directly with SSMS is much faster than running queries with SQLCMD? I've noticed that the results of queries that ran ...
4
votes
3answers
4k views

NULLs in a composite primary key - SQL Server

I'm trying to work out the best way of creating SQL Server primary keys, foreign keys and constraints to accurately represent my data model in LINQ / Entity Data Objects. Let's assume - for the ...
3
votes
2answers
139 views

Unable to restore database backup because it is accessed by other connection

--first command use master Go -- second command ALTER DATABASE MyDB SET SINGLE_USER WITH ROLLBACK IMMEDIATE Go -- Third command RESTORE DATABASE [MyDB] FROM DISK = ...
3
votes
4answers
5k views

Not able to create SSISDB catalog

Getting the error below while trying to create a catalog in sql server 2014 integration services. Any idea what I missed in installation or anywhere else? The catalog backup file 'C:\Program ...
3
votes
1answer
596 views

SQL Server DMV to show if database is used

What is the best indicator in finding out whether a database is utilized or accessed? I tried index statistics and based on I/O utilization but none seem to be a good indicator. Problem: I have a ...
3
votes
3answers
3k views

Query to find GUID's “not in” null containing subquery returns no results

When I have a query that checks if a column of type uniqueidentifer does not exist in a table that has a null value then I get no results back. If the subquery does not return a null it works fine and ...
3
votes
1answer
2k views

How does Log shipping knows to keep track

I have set up log shipping between 2 SQL Servers (SQL Server 2008 and SQL Server 2012). At first i took a full backup of the first one and restored it on the other one and than i set up the log ...
3
votes
1answer
148 views

Should all queries where you expect a specific order, include an ORDER BY clause?

In order to better understand the SQL Server query processor, I've been thinking about how the ORDER BY clause works, and how SQL Server provides results. It appears SQL Server will provide results ...
3
votes
2answers
1k views

Restore a Database into a Current Database and merge

I want to know how, or if it is possible, to backup a database then should the user wish, restore that database at a later date and merge it with the one they are currently using. Both Databases will ...
3
votes
1answer
434 views

Shrinking log file

Some of the sql log files (idf) are hugh like 5gb. Found a article (http://extended64.com/blogs/rhoffman/archive/2009/06/11/shrink-sql-server-2008-database-log-file-script.aspx) but not sure why he ...
3
votes
1answer
2k views

Is SQL Server Backup single or multi-threaded?

If you perform a... BACKUP DATABASE [DB_Name] TO DISK=N'c:\backups\db_name.bak' WITH STATS=10 Will that perform a single or multi-threaded write? Our Server support company advised us that if we ...
2
votes
2answers
228 views

how to find the T-SQL of a sleeping session that is blocking some other process?

I have a stored procedure called sp_radhe that I put on my servers and it has been helping me to "see" what is happening internally. here is the code of this stored procedure: USE [master] GO SET ...
2
votes
1answer
94 views

What is the most efficient way to concatenate strings in SQL Server?

I have this code: DECLARE @MyTable AS TABLE ( [Month] INT, Salary INT ); INSERT INTO @MyTable VALUES (1,2000), (1,3100); SELECT [Month], Salary FROM @MyTable; Output: I want to concat ...
2
votes
3answers
1k views

How to speed up a multiple select query

EDIT - Putting my whole stored procedure: I have the below stored procedure: CREATE PROCEDURE [dbo].[data_Update] @Owner NVARCHAR(255), @ID VARCHAR(255), @Division VARCHAR(255), @Manager ...
2
votes
1answer
22k views

distributed queries are configured to run in single-threaded apartment mode

I have sql server 2008 R2 64bit Developer's Edition Installed on my machine. And Microsoft Office 2010 Professional 32bit. I have been trying to import some Excel data from an Excel sheet into a sql ...
1
vote
1answer
91 views

Moving SQL Server 2012 Database to SQL Server 2008 R2

I follow the answer of Mr. Kin in this post How to move a database from SQL Server 2012 to SQL Server 2005 I run the query without errors, but when I check my blank database created on SQL Server ...
1
vote
2answers
122 views

Managing logins with Availabilty Groups

I have created a user on my primary node that has access to all of the databases in Availability Group AG1. How do I ensure that same user has the same rights on all the other replicas in AG1? ...
1
vote
1answer
308 views

Restoring a differential backup in SQL server 2005

I have created a full back up of my database by executing the line below in my application: Dim Query As String = "backup database Ari to disk='G:\Documents and Settings\i\Desktop\BKAR\" & ...
1
vote
1answer
2k views

Partial restore to a different database

I have a database with 3 filegroups: PRIMARY, AP, and GL. I did a full database backup. I did a partial restore of just the PRIMARY and AP files successfully using this command: -- Partial Backup ...
-3
votes
1answer
788 views

Why does a VIEW with a CLUSTERED index not use the index?

I have a view that has a clustered index along with other non-clustered indexes. A simple SELECT query does not use any of the indexes even when I select an indexed column. What could be the ...
125
votes
18answers
29k views

Should developers be able to query production databases?

Should developers be given permission to query (SELECT / read only) production databases? The previous place I worked, the development team had the db_datareader role; where I work now the ...
42
votes
4answers
34k views

What risks are there if we enable read committed snapshot in sql-server?

I have read here that some extra data will be stored per row so we might see a performance degradation but what other risks are there? eg. Will this affect recovery of the database? Is there anything ...
40
votes
5answers
2k views

Date range rolling sum using window functions

I need to calculate a rolling sum over a date range. To illustrate, using the AdventureWorks sample database, the following hypothetical syntax would do exactly what I need: SELECT TH.ProductID, ...
51
votes
2answers
119k views

How to the get current date without the time part

In SQL Server 2005 how do I get the current date without the time part? I have been using GETDATE() but would like it to have a time of 00:00:00.0
17
votes
2answers
12k views

What are the best practices for running SQL Server in a Virtual Machine?

What are the best practices for running SQL Server in a Virtual Machine? My on-line transaction activities are very low, but there is a high amount of data processing for the purpose of providing ...
27
votes
4answers
40k views

How do I assign an entire Active Directory group security access in SQL Server 2008?

I would like to use integrated security with my internal application which is all on a domain. Unfortunately, I've never been able to get this to work well. I would like to assign an entire Exchange ...
23
votes
3answers
11k views

Running total with count?

As the title suggests I need some help getting a running total in T-SQL. The problem is that the sum I need to do is the sum of a count: sum(count (distinct (customers))) Say if I ran the count ...
16
votes
1answer
12k views

Trigger in combination with transaction

Suppose we have the following situation: We have a table (let's say Table_A), wich has a trigger on INSERT. The trigger job is to update some rows in table_B based on the inserted values in table_A. ...
36
votes
11answers
5k views

How can I track database dependencies?

As internal applications evolve over a number of years, you occasionally find there are a number of tables that people believe are no longer relevant and want to cull. What are the practical methods ...
13
votes
6answers
27k views

SQL Server 2012 slower than 2008

I migrated a large website and database from an older server (Windows 2008 / SQL Server 2008 / 16 GB RAM / 2 x 2.5 GHz Quad Core / SAS disks) to a newer, much better server (Windows 2008 R2 / SQL ...
21
votes
3answers
7k views

Managing concurrency when using SELECT-UPDATE pattern

Let's say you have the following code (please ignore that it's awful): BEGIN TRAN; DECLARE @id int SELECT @id = id + 1 FROM TableA; UPDATE TableA SET id = @id; --TableA must have only one row, ...
18
votes
3answers
3k views

What are valid usage scenarios for HEAP tables?

I am currently doing some data imports into a legacy system and discovered that this system does not use a single clustered index. A quick Google search introduced me to the concept of HEAP tables and ...
17
votes
1answer
15k views

Connection pools being reset with Error: 18056, Severity: 20, State: 46. & Perfmon Counters not showing

We are using SQL authentication & .net 4.0 Connection strings to connect to an Enterprise Edition 2012 SP1 SQL Server on a windows 2008r2 Enterprise Server. We use about 50 Servers split into 8 ...
10
votes
2answers
8k views

SQL Server database design for “archived but available” data

We have this large database (>1TB) that we intend to "shrink". The database revolves around one main entity, let's call it "Visit". For discussion, let's say it is a database for a medical practice. ...
10
votes
2answers
9k views

SQL Server Join/where processing order

After reading Slow SQL query, not sure how to optimize, it got me thinking about the general performance of queries. Surely, we need the results of the first table (when other tables are joined) to be ...