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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5
votes
1answer
4k views

Find transactions that are filling up the version store

we have enabled the "READ_COMMITTED_SNAPSHOT" for some of our SQL Server 2005 databases. Now from time to time we see that our TempDB is filling up the harddisk and we suspect the version store to be ...
2
votes
1answer
496 views

Need help with SQL Server PIVOT

I know about the PIVOT feature in SQL Server and I've read a few other questions and answers on here but I just can't seem to grasp it in order to do what I need. I'm trying to run some calculations ...
1
vote
1answer
2k views

routine to backup ssas databases fails with: The XML for Analysis request timed out before it was completed

I have developed my own stored procedure, that through a LINKED SERVER, backups the SSAS databases according to a table value parameter. the code for the stored procedure is below. the problem: it ...
4
votes
2answers
742 views

Unexpected gaps in IDENTITY column

I'm trying to generate unique purchase order numbers that start at 1 and increment by 1. I have a PONumber table created using this script: CREATE TABLE [dbo].[PONumbers] ( [PONumberPK] [int] ...
1
vote
1answer
841 views

Why is CDC capture failing due to a missing dbo principal

I am having a problem running the CDC change capture job against some of my test databases. The error message I'm getting is the following: Executed as user: NT AUTHORITY\NETWORK SERVICE. Cannot ...
78
votes
4answers
19k views

Why use both TRUNCATE and DROP?

In the system I work on there are a lot of stored procedures and SQL scripts that make use of temporary tables. After using these tables it's good practice to drop them. Many of my colleagues (almost ...
65
votes
5answers
30k views

When to use TINYINT over INT?

In general, I always use Ints. I know that in theory this is not the best practice, though, since you should use the smallest data type that will be guaranteed to store the data. For example, it's ...
44
votes
8answers
13k views

What is the difference between a “record” and a “row” in SQL Server?

There was a rather innocuous question about adding dates and times in SQL Server that set off a rather fascinating taxonomic debate. So how do we differentiate between these related terms and how we ...
20
votes
2answers
37k views

How to find the SQL statements that caused tempdb growth?

The tempdb of a server (SQL Server 2008) increases to 500GB+ several times every month. Is it possible to find out which SQL statements caused this problem? The problem is usually not caused by create ...
17
votes
2answers
11k views

Stored procedures vs. inline SQL

I know stored procedures are more efficient through the execution path (than the inline sql in applications). However, when pressed, I'm not super knowlegeable about why. I'd like to know the ...
26
votes
7answers
49k views

How can I tell if a SQL Server database is still being used?

We're looking to decommission a SQL Server instance which has a couple databases still remaining on it. How can I tell if they are still being used by users or a web application? I found a forum ...
13
votes
3answers
16k views

What can cause a mirroring session to timeout then failover? SQL Server 2005

We have two production SQL Servers running SQL Server 2005 SP4 with cumulative update 3. Both servers run on physical machines that are identical. DELL PowerEdge R815 with 4 x 12 core CPUs and 512GB ...
11
votes
3answers
35k views

Query to report disk space allocation and used space

We are using 6 databases in total for an application, and we can only share 4TB of space among all 6 auto-grow databases (via SAN storage). I'd like to write a query (report) for a single database ...
5
votes
1answer
5k views

Who changed/modified stored procedure in SSMS 2005 or 2008? [duplicate]

Possible Duplicate: Determining how a schema change occurred? I have a stored procedure that was modified late last night and just spent the majority of the morning tracing issues back to ...
26
votes
4answers
5k views

Does the order of columns in a table's definition matter?

When defining a table, it's helpful to order the columns in logical groups and the groups themselves by purpose. The logical ordering of columns in a table conveys meaning to the developer and is an ...
42
votes
5answers
30k views

Why does ALTER COLUMN to NOT NULL cause massive log file growth?

I have a table with 64m rows taking 4.3 GB on disk for its data. Each row is about 30 bytes of integer columns, plus a variable NVARCHAR(255) column for text. I added a a NULLABLE column with ...
36
votes
3answers
3k views

Performance of Non Clustered Indexes on Heaps vs Clustered Indexes

This 2007 White Paper compares the performance for individual select/insert/delete/update and range select statements on a table organized as a clustered index vs that on a table organized as a heap ...
23
votes
1answer
13k views

GO After every T-SQL statement

What is the reasoning behind using the GO statement after every SQL statement? I understand that GO signals the end of batch and/or allows the reputation of statements but what advantage does it have ...
10
votes
2answers
8k views

SQL Server 2012: Generate Scripts from command line

I am running SQL Server 2012. The SQL Server Management Studio has the option to right click on a database then select Tasks and Generate Scripts. Is there a way to automate that via command line ...
10
votes
1answer
33k views

Login failed for user - Error 18456 - Severity 14, State 38

Message that SQL Server Log File Viewer shows: Login failed for user [User] Error: 18456, Severity: 14, State 38 What it actually means: Failed to open the explicitly specified database My ...
10
votes
4answers
5k views

Help me choose a RAID level combination for a SQL Server 2008 instance

I am going to rebuild one IBM 3400 server from scratch. This server is dedicated to a SQL Server 2008 instance running on Windows 2008 R2. I am going to make new RAID configuration. I have 6 SCSI ...
8
votes
2answers
35k views

Return a column per date in a range

Let's say I have Table A: BookingsPerPerson Person_Id ArrivalDate DepartureDate 123456 2012-01-01 2012-01-04 213415 2012-01-02 2012-01-07 What I need to achieve with a ...
21
votes
3answers
11k views

Adding columns to production tables

What's the best way to add columns to large production tables on SQL Server 2008 R2? According to Microsoft's books online: The changes specified in ALTER TABLE are implemented immediately. If the ...
10
votes
4answers
31k views

Is there a way to generate table create script in TSQL?

Is there a way to generate a create script from an existing table purely in T-SQL (that is without using SMO, since T-SQL does not have access to SMO). Let's say a stored procedure that receives a ...
8
votes
1answer
9k views

What does role db_owner allow

I have been trying to troubleshoot a login that is not able to view certain tables in a SQL Server 2012 database. In doing so I find I don't quite understand what membership in the db_owner role ...
7
votes
2answers
19k views

SQL Server becomes slower over time until we have to restart it

We have a database with a mixed OLAP/OLTP workload. The queries are quite ad-hoc and are dynamically created in the mid-tier application server. When we start the server, the performance is quite ...
16
votes
3answers
808 views

Setting up a central CLR stored procedure / function respository library for internal stored procs in other databases to use?

I would like to use code that I developed in C# CLR to be used in all of the databases on the system so that I don't have to set each to trustworthy and turn CLR on and keep a bunch of the same code ...
11
votes
4answers
52k views

SQL Server database size didn't decrease after deleting large number of rows.

I'm no good in SQL, but I've got a database to maintain. There's almost no place left for it, so I've decided to delete all the data for, let's say, year 2008. After executing delete query (had ...
5
votes
5answers
9k views

SQL Server 2012 AlwaysOn: need to automatically add databases by script- T-sql or PowerShell

I've installed and successfully configured our SQL Server 2012 AlwaysOn 2-node servers for our new "Intranet" that is coming out. I've gotten AlwaysOn working great, and our Front End servers for the ...
3
votes
1answer
2k views

Can I use a script to restore multiple SQL databases from .bak files?

I'm migrating 100 plus SQL databases over to a new server in a new location. I have the maintenance plan in place to take full back ups and then a script to copy over the .bak files to a temp ...
11
votes
2answers
725 views

Setting READ UNCOMMITTED when reading DMVs

I've seen several people call SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED before reading system DMVs. Is there ever any reason to do this, assuming you aren't mixing calls to DMVs and tables in ...
10
votes
1answer
2k views

SQL Server 2012 Page Life Expectancy resets to 0 after about 50 days

I've noticed an odd behavior on a 2-server HA cluster and I was hoping someone could confirm my suspicion, or maybe offer some other explanation... Here is my setup: A 2-server SQL 2012 SP1 ...
8
votes
1answer
4k views

Trouble With Database Permissions for sp_send_mail

I am trying to send database mail but I am getting EXECUTE permission denied on the object 'sp_send_dbmail' database 'msdb', schema 'dbo'.. I code I am running is as follows: SELECT SUSER_NAME(), ...
5
votes
1answer
3k views

SQL Server: hierarchy of permissions for schema?

We have several databases under development and I would like to start using SQL Server schemas for permission management and logical grouping of database objects. Under Schema Properties there is ...
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 ...
3
votes
3answers
7k views

Automatically restore SQL Server database from file from another server

We have a daily task to overwrite a number of development databases using backups of the associated production databases. The backups are produced by maintenance plans on the production server then ...
3
votes
1answer
536 views

Limiting database security

A number of texts signify that the most important aspects offered by a DBMS are availability, integrity and secrecy. As part of a homework assignment I have been tasked with mentioning attacks which ...
2
votes
1answer
4k views

Creating Users on secondary server in log shipping

I have a production Server say ServerA I have setup log shipping to ServerB which is left in read-only mode. The purpose of this log shipping is to lower the load on production server for some ...
16
votes
2answers
9k views

How to know when/if I have too many indexes?

Running Microsoft SQL Server Profiler every now and then, it suggests me with a bunch of new indexes and statistics to create ("...97% estimated improvement..."). From my understanding every added ...
8
votes
2answers
972 views

Can't find process that is creating backups

We have an instance of SQL Server 2008 installed on a customer server. The customer's IT department is in charge of the various backups of the machine. The SQL Server log shows there is a full backup ...
8
votes
2answers
554 views

Are the cost percentages in this SQL Server plan over 100% for a valid reason?

I'm looking through the plan cache, looking for low-hanging optimization fruit and came across this snippet: Why are many of the costs listed above 100% ? Shouldn't that be impossible?
6
votes
3answers
19k views

Error: “To run a ssis package outside of sql server data tools you must install [send successful email] of Integration Services or higher.”

NOTE that the title of this qusetion is a verbatim error message specific to this user. The error message illustrates a bug in the dtexec application, which substitutes a user variable into the error ...
6
votes
1answer
2k views

Storage order vs Result order

This is a spin-off question from Sort order specified in primary key, yet sorting is executed on SELECT. @Catcall says this on the subject of storage order (clustered index) and the output order ...
5
votes
2answers
10k views

Find which session is holding which temporary table

We have a SQL Server 2005 database the temp database has become full. By going into SQL Server Management Studio I can see all the temporary tables in the tempdb. Is it possible to tell which session ...
5
votes
2answers
6k views

Issues with TempDB mdf file ever increasing

I have a tempdb growth issue. Let me preface everything by giving my tempdb settings. Even with no queries running on the database/server tempdb keeps on increasing in size, at first rapidly and ...
5
votes
1answer
4k views

Attaching a database in SSMS gives error

I am accessing SQL Server using SSMS, and a user with adequate permissions. When this user tries to attach a database by using SSMS (by right clicking on database node and then clicking on attach), ...
4
votes
5answers
27k views

Convert varchar column to datetime

In SQL Server, I have a varchar column with value such as: 07/May/2012:00:06:22 07/May/2012:00:06:22 07/May/2012:00:06:22 07/May/2012:00:06:22 07/May/2012:00:06:22 QUESTIONS How do I convert ...
3
votes
1answer
2k views

How to get server cpu, memory, network usage from SQL Server

For reporting purposes, I want to get SQL Server box CPU, memory, network (not SQL Server process alone) and show it in report. Do you have any idea how to pull this? My initial thoughts are run wmi ...
2
votes
1answer
688 views

Why has my database connection failed?

Recently I have developed software using SQL Server 2012. Now when I try to connect, I get this error message: Cannot connect to AAFI\SQLEXPRESSA network-related or instance-specific error ...
2
votes
3answers
928 views

Copy database to local from server [duplicate]

As I show , I have server database version-10.50.1600 and local database version-10.0.1600 . How can I copy database (with all tables and data(s)) from server to local which has different version ? ...