SQL Server 2008 R2 (major build version 10.50.xxxx). Please also tag with sql-server.

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16
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9answers
3k views

Version control for database objects

The database our developers are working on is too large (have a lot of database objects). We have to control db objects changes (change management). Our company cannot have a person who would be ...
31
votes
5answers
6k views

Why is there still a varchar data type?

Many of my databases have fields defined as varchars. This hasn't been much of problem since I live and work in America (where the only language that exists is "American". ahem) After working with ...
16
votes
1answer
9k views

How to write a query which finds all circular references when a table references itself?

I have the following schema (names changed), which I cannot change: CREATE TABLE MyTable ( Id INT NOT NULL PRIMARY KEY, ParentId INT NOT NULL ); ALTER TABLE MyTable ADD FOREIGN KEY ...
14
votes
2answers
4k views

Changing a column from NOT NULL to NULL - What's going on under the hood?

We have a table with 2.3B rows in it. We'd like to change a column from NOT NULL to NULL. The column is contained in one index (not the clustered or PK index). The data type isn't changing (it's an ...
13
votes
4answers
10k views

SQL Server database on an SSD - any advantage to a separate file for every table?

I'm creating a database in which there will be around 30 tables, with every table containing tens of millions of rows and each table containing a single important column and a primary/foreign key ...
16
votes
2answers
6k views

Restore database excluding FILESTREAM data

Context We are developing a system with a large-ish database in the bottom. It is an MS SQL database running on SQL Server 2008 R2. The total size of the database is about 12 GB. Out of these, ...
15
votes
2answers
6k views

Can you explain this execution plan?

I was researching something else when I came across this thing. I was generating test tables with some data in it and running different queries to find out how different ways to write queries affects ...
13
votes
1answer
22k views

Parent-Child Tree Hierarchical ORDER

I have to following data in SQL Server 2008 R2. SQLFiddle Schema: CREATE TABLE [dbo].[ICFilters]( [ICFilterID] [int] IDENTITY(1,1) NOT NULL, [ParentID] [int] NOT NULL DEFAULT 0, ...
13
votes
3answers
3k views

How often to backup the master database?

The suggestion in BOL is fairly vague: Back up master as often as necessary to protect the data sufficiently for your business needs. We recommend a regular backup schedule, which you can ...
12
votes
1answer
2k views

Interpreting SQL Server's Showplan XML

I just rolled out a feature on my site http://sqlfiddle.com that allows users to view the raw execution plans for their queries. In the case of PostgreSQL, MySQL, and (to some extent) Oracle, looking ...
11
votes
2answers
1k views

Optimization: Moving variable declarations to the top of your procedure

While working on optimizing some stored procedures, I sat down with the DBA and went through some sprocs with high blocking and/or high read/write activity. One thing the DBA mentioned was I should ...
7
votes
2answers
3k views

Latin1_General_BIN performance impact when changing the database default collation

I have set the database collation to Latin1_General_BIN, to make string comparisons case-sensitive. Will this have an impact on performance? Will it have any impact on DML or DDL operations in the ...
12
votes
6answers
70k views

Download SQL Server Profiler for SQL Server Management Studio

How can I profile a SQL Server 2008 database to see code that's being executed on a particular database? I remember using the SQL Server profiler, but I don't see it in SQL Server Management Studio ...
7
votes
2answers
3k views

Generate script to automate renaming of default constraints

Background: Some of our default column constraints were generated without explicit names, so we get fun names that vary from server to server like: DF__User__TimeZoneIn__5C4D869D I would prefer to ...
6
votes
3answers
4k views

Verifying password policy on existing users

I've recently come into an environment where a lot of databases logins do not have the enforce_password_policy flag enabled. An upcoming audit is necessitating the verification of these logins' ...
6
votes
1answer
2k views

How is SQL Server returning both a new value and old value during an UPDATE?

We've had issues, during high concurrency, of queries returning non-sensical results - results the violate the logic of the queries being issued. It took a while to reproduce the issue. I've managed ...
4
votes
3answers
4k views

How? SQL Cluster with multiple active nodes (not failover)

I'm building a new SQL 2008 R2 (Enterprise) Cluster that is backed by an EqualLogic iSCSI SAN. Instead of building a failover cluster (which I have done), I would instead like to setup several nodes ...
2
votes
2answers
9k views

Should I join datetime to a date using cast or range?

This question is a take-off from the excellent one posed here: Cast to date is sargable but is it a good idea? In my case, I am not concerned with the WHERE clause but in joining to an events table ...
8
votes
2answers
984 views

How should I configure these disks on a SQL Server for a BI configuration?

Assuming constant memory (32gb) and CPU (4), 2 x disk arrays, I have the following disks 2 x 150 (10k) 6 x 150 (15k) They are all local disks. My requirements My DB is 350gb and set to default ...
8
votes
2answers
10k views

Transaction and Try-catch in SQL Server Job

We have DML operations in each step of a SQL Server job. To ensure the update/insert will be rolled back in case something goes wrong, I have wrapped the data modifications of each step in TRY CATCH ...
7
votes
2answers
5k views

An efficient way to compare two large data sets in SQL

Currently, I'm comparing two data sets, that contain unique StoreKey/ProductKey combinations. The 1st data set has the unique StoreKey/ProductKey combinations for sales between begin January 2012 and ...
7
votes
1answer
3k views

Broken tempdb location and can't recover

Made a mistake and mistyped an alter database command for tempdb. Now the instance won't start. I can't start in single user mode using -m as it states the tempdb could not be found. I tried using: ...
7
votes
2answers
243 views

'Cleanse' a SQL Server database file created with Instant File Initialization enabled?

I have Instant File Initialization enabled on our SQL Server, so the 'empty' part of the database file is not zeroed before being allocated. My understanding is that this means that the file could ...
7
votes
2answers
12k views

SQL 2008 R2 creates user/schema when Windows user creates tables

We added a server login and database user that map a Windows Group to a SQL 2008 R2 instance using the following script, with the names changed for anonymity: USE master go CREATE LOGIN ...
5
votes
4answers
29k views

Displaying the list of all tables in all database

How can I display a list containing all the tables of all the database in a SQL Server 2008 R2 server?
5
votes
3answers
5k views

In Microsoft SQL Server 2008, syntax generates the error “The Parallel Data Warehouse (PDW) features are not enabled.”

I have the following virtual column generated from an aggregate over a sorted partition, MIN(picture_id) OVER ( PARTITION BY [360_set] ORDER BY picture_id ASC ) However, when I execute that, I get ...
4
votes
2answers
8k views

SQL Server 2008R2 - Why is my index not used

I have a table defined in the following way: CREATE TABLE [dbo].[MyTable] ( [MyTable_ID] [int] IDENTITY(1,1) NOT NULL, [COLUMN_WITH_DATA] [varchar](128) NOT NULL, [COLUMN_A] [varchar](128) ...
3
votes
1answer
3k views

Why dropping all foreign keys from a script is not working? [closed]

I have sysadmin rights on a SQL Server 2008 R2 box. I found a script that can drop all foreign keys and re-add them for us when we need to after a testing import. So I execute the below code with no ...
3
votes
1answer
2k views

CREATE DATABASE permission denied for sysadmin

I'm attempting to create a stored procedure that can be used as a proxy for creating databases where users do not have rights for creating databases. See Restricting Database Access/Functions to User ...
3
votes
4answers
2k views

Working Linked Server Query fails in sp_send_dbmail

Take the following example: EXEC msdb.dbo.sp_send_dbmail @recipients = 'me@whatever.co.uk' , @query = 'SELECT TOP 10 * FROM LINKEDSERVERA.DATABASE.dbo.TABLE' , @attach_query_result_as_file = N'True' ...
3
votes
2answers
2k views

TdsInputBufferError not 0 in LoginTimers errors of RING_BUFFER_CONNECTIVITY of sys.dm_os_ring_buffers

I've got an issue with SQL Server. The value of TdsInputBufferError is not 0 in LoginTimers errors of RING_BUFFER_CONNECTIVITY of sys.dm_os_ring_buffers. This happens randomly, once or twice a week, ...
2
votes
1answer
839 views

SQL Server connection failed for domain user from Mac OS machine

I have SQL Server 2008 R2 SP1. I am using connection string to connect to SQL Server. In connection string I am passing the driver path, server name, TCP port number, user name with which I want to ...
2
votes
1answer
1k views

Disadvantages of reorganizing all tables nightly

I consider scheduling a SQL Server job that reorganizes all tables nightly. We don't have enterprise, so we cannot rebuild online (this means we need to reorganize). We also don't want to invest too ...
12
votes
4answers
5k views

Rebuilding Indexes, DB now 10x the size

I have a SQL Server database (2008 R2 SP1) that was about 15 gigs. It turns out maintenance hadn't been running in a while, so I created a maintenance plan to rebuild all the indexes, they were very ...
12
votes
5answers
6k views

SQL Server 2008 Full Text Index Never Seems to Complete

Our website has a SQL Server 2008 R2 Express Edition database with full-text indexing for our website search. Each time a new record is added or updated in one of the indexed tables, the indexing ...
10
votes
4answers
530 views

Using third party tools to backup

Is there any advantages to use Third Party Tools to make Backups ? I'm not referring one in particular but I want to know if someone using them to DB greater than 200 GB. Servers are mostly MSSQL ...
8
votes
2answers
9k views

Deny access to information schema in SQL Server

I am looking for the best way to disable access to the sys.tables / Information Schema for a user / group in SQL Server. I found this thread from 2008 It shows a way how to deny access on ...
7
votes
1answer
164 views

Lead/Lag Implementation in SQL Server 2008 R2: Max memory exceeded

Background I'm trying to establish a "visits" sequence, wherein if an animal is detected at essentially the same place (General_Location) it counts as a single visit, but if it goes elsewhere and ...
7
votes
1answer
1k views

Does Detach/Attach or Offline/Online Clear the Buffer Cache for a Particular Database?

A buddy of mine told me today that instead of bouncing SQL Server, I could simply detach and then re-attach a database and this action would clear the given database's pages and plans from cache. I ...
7
votes
3answers
16k views

SQL update satement taking a very long time / high disk usage for hours

Yes it sounds like a very generic issue, but I have not been able to narrow it down very much yet. So I have an UPDATE statement in a sql batch file: UPDATE A SET A.X = B.X FROM A JOIN B ON A.B_ID = ...
6
votes
2answers
1k views

What does Page Life Expectancy say about the instance?

I have installed monitoring software on a few SQL Server instances in the environment. I am trying to find bottlenecks and fix some performance issues. I want to find out if some servers need more ...
6
votes
2answers
1k views

What characters are word breakers in English for SQL Server 2005 and 2008 R2?

I can find what DLL supports English word breakers by using sp_help_fulltext_system_components but I have not been able to find an actual list of the word breaking characters for English (like blank, ...
5
votes
2answers
2k views

Is Information in sys.dm_db_index_usage_stats reliable

I'm archiving data from an old system that has no documentation. Lucky me... I'd like to find out when the tables were created, last accessed etc. Can I trust that this query will give me the correct ...
5
votes
1answer
403 views

SA permissions issues with many nested objects

I have a broker application that's relatively complicated. Today, after I made some changes, I started getting the error: The server principal 'sa' is not able to access the database 'XYZ' under ...
5
votes
2answers
2k views

Why can't I read my transaction log backup file using fn_dump_dblog?

I'm using this blog on sqlskills.com as a guide to practice finding the relevant LSN in a transaction log backup for point in time recovery. After backing up the transaction log, I attempt to read it ...
5
votes
4answers
12k views

Copy Database option not found in SQL Server Management Studio 2008 R2

I am unable to see the Copy Database option in SQL Server Management Studio 2008 R2. Can anyone tell me whats going on please?
4
votes
4answers
175 views

Validate three digits before decimal and after decimal point six digits

I have columns called longitude and latitude with nvarchar data type. The user can enter something like (23.23424432),(432423.343), which should not be allowed. Can anyone help me to validate this in ...
4
votes
5answers
333 views

Does index rebuild time depend on the fragmentation level?

Is the required time for index rebuild dependent on the level of fragmentation? Does the rebuild of a 80% fragmented index approximately take 2 minutes if the rebuild of the same index fragmented ...
4
votes
2answers
511 views

Efficently Remove 90% of a table's data

I am working on a process to remove 90% of a table's data because only 10% is needed for testing. The best way I have found includes storing 10% of the table's rows into a temporary table. Current ...
4
votes
2answers
423 views

Strategies for “checking out” records for processing

I'm not sure if there is a named pattern for this, or if there isn't because it's a terrible idea. But I need my service to operate in an active/active load balanced environment. This is the ...