This tag is for SQL Server 2008, major build version 10.00.xxxx.

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14
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1answer
2k views

Why does SQL Server “Compute Scalar” when I SELECT a persisted computed column?

The three SELECT statements in this code USE [tempdb]; GO SET NOCOUNT ON; CREATE TABLE dbo.persist_test ( id INT NOT NULL , id5 AS (id * 5) , id5p AS (id ...
14
votes
2answers
5k views

ISO Week vs SQL Server Week

Okay so I have a report that does a this week vs last week comparison and our customer noticed that their data was "funky". Upon further investigation we found it was not doing weeks correctly ...
13
votes
7answers
26k views

Moving tables to another SQL2008 database (including indexes, triggers, etc.)

I need to move a whole bunch (100+) of large (millions of rows) tables from one SQL2008 database to another. I originally just used the Import/Export Wizard, but all the destination tables were ...
13
votes
5answers
3k views

Is ROLLBACK a fast operation?

Is it true that RDBMS systems are optimized for COMMIT operations? How much slower/faster are ROLLBACK operations and why?
13
votes
4answers
32k views

How to add sysadmin to user in SQL Server 2008 when no sysadmin accounts exist

I have a SQL server 2008 instance running. Unfortunately during testing I deselected the sysadmin rights for my login and now can't readd it (because I don't have sysadmin rights). There are no other ...
13
votes
4answers
895 views

The order of columns in a table [duplicate]

From what I've seen so far, when we define a table, normally we put the primary key as the first column. If there are miscellaneous columns that are common in all tables, they come at the bottom of ...
13
votes
3answers
4k views

Schema design - best practices?

I understand the capabilities of SQL Server Schemas, but what are the best practices? Sure they give another layer of security, and provide logical grouping of database objects within the database, ...
13
votes
3answers
7k views

When a previously-fast SQL query starts running slow, where do I look to find the source of the issue?

Background I have a query running against SQL Server 2008 R2 that joins and/or left-joins about 12 different "tables". The database is fairly large with many tables over 50 million rows and about 300 ...
13
votes
2answers
10k views

How to avoid using variables in WHERE clause

Given a (simplified) stored procedure such as this: CREATE PROCEDURE WeeklyProc(@endDate DATE) AS BEGIN DECLARE @startDate DATE = DATEADD(DAY, -6, @endDate) SELECT -- Stuff FROM Sale ...
13
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3answers
3k views

Does the partition key also have to be part of the primary key?

I am partitioning a table based on a column that is not a primary key? I've read some conflicting information today on whether the partition column must be a part of the primary key. My gut says no, ...
12
votes
4answers
8k 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 ...
12
votes
1answer
2k views

Patterns for setting up sharding for SQL Server 2008 R2, in order to handle large datasets?

I want to handle a large dataset (> 1 billion rows) in SQL Server 2008 R2. I heard that if you set up "sharding" or "horizontal partitioning", it makes it quicker to handle large datasets as it breaks ...
12
votes
2answers
500 views

Decision criteria on when to use a non-dbo schema vs a new Database

I'm mostly an application developer but find myself having to do all the up-front database work for my current project (btw... its MS SQL Server 2008). As a first decision, I'm trying to figure out ...
12
votes
4answers
891 views

Creating centralized DBA database

We have 200+ servers and I am thinking about creating a centralized DBA database where it logs backup, errors, space jobs and generate reports on SSRS. I am not sure where to start and I would highly ...
12
votes
2answers
1k views

Why can't I use NEWSEQUENTIALID() as the default value for my column?

I'm trying to create a table in Management Studio and after reading about the new (from SQL 2005 on) NEWSEQUENTIALID() function, thought I'd give it a go. This is what I'm doing: But it's not ...
12
votes
3answers
5k views

Is there a way to determine if SQL Server queries are running in memory or going to disk?

I came across a set of stored procedures in an application today that are called repeatedly within a long running process. Within each procedure I found multiple different select statements, some ...
12
votes
1answer
15k views

Varchar(Max) field cutting off data after 8000 characters SQL Server 2008

I have a field to store some data, the field is declared as varchar(Max). To my understanding this should be storing 2^31 - 1 characters but when I enter some content over 8000 chars it cuts the rest ...
12
votes
2answers
3k views

Deadlocks From Locks on Same Temporary Tables In Different Processes

I have found a deadlock that appears to show something I thought was impossible. There are two processes involved in the deadlock: 1. process8cf948 SPID 63 Performing an ALTER TABLE on temporary ...
12
votes
3answers
3k views

Can I move rows between partitions by updating the partition key?

I would think that this would be a fairly simply question, but I've actually had a difficult time finding an answer for this. The question: Can you move rows of data within a partitioned table from ...
12
votes
1answer
6k views

How do you ORDER BY a parameter?

Just wondering if I could solicit some feedback on a stored procedure I'm running and whether there's a more efficient way of handling the scenario (I'm pretty sure there will be!). Basically I have ...
12
votes
1answer
2k views

When should extended events be used instead of SQL Profiler/perfmon?

The extended events seem like a better technology and less stress on the server, but the SQL Profiler/perfmon has better tooling. Also the extended events seem to have a steeper learning curve. In ...
12
votes
1answer
1k views

What types of corruption can DBCC CheckDB miss?

This question was prompted by this earlier post and my having a database filed away for future investigation that was restored following: BACKUP 'BrokenDatabase' detected an error on page (1:123456) ...
12
votes
1answer
374 views

Best practices for connecting DBs that are in different geographical regions

We are about to set up SQL Servers in different countries. We need to link them, but we don't have to have a direct link (as in linked server). In other words, they can be loosely coupled. Is it ...
12
votes
1answer
4k views

When should you specify PAD_INDEX?

So, you can use FILLFACTOR to leave space in leaf index pages. Specifying PAD_INDEX also leaves space in intermediate nodes. What scenarios should you specify PAD_INDEX, and what benefit does it ...
12
votes
4answers
9k views

SQL Server statements intermittently slow on SQL Server 2008 R2

On one of our customers, we've been having some performance issues on our application. It's a .NET 3.5 web app that is consuming and updating data on a SQL Server database. Currently our production ...
12
votes
3answers
1k views

What's the most effective way to duplicate an instance on SQL 2008?

We've got a simple database instance with just enough data in the databases to keep it useful, and we can use it for demonstration purposes, and I want to put a copy of it on my laptop so I can use it ...
12
votes
3answers
2k views

Implications of using a Unique NonClustered Index with Covering Columns instead of a Primary Key

We have a large table [MyTable] which currently has both a Primary Key, and a Unique Non Clustered Index on the same column ([KeyColumn]). The U NC index also has additional covering columns. Having ...
12
votes
2answers
510 views

SQL Server 2008 Performance issue with very strange resolution

I'm a long time DBA (12 years in SQL). I'm running SQL Server 2008 Enterprise in a Win 2008 clustered environment. 128gb memory and 32cpu in each cluster node. Not wimpy. I've got the weirdest ...
11
votes
2answers
2k views

Why does SELECT 1/2 return 0?

As the title says. I even tried SELECT CONVERT(NUMERIC, 1/2) which also returned 0. I am using SQL Server 2008.
11
votes
3answers
5k views

SQL Server 2008 R2 “Ghost Memory”?

We have a dedicated SQL Server 2008 R2 machine that is experiencing some strange memory issues.. The machine itself has plenty of resources including two quad-core processors, 16gb of RAM and 64bit ...
11
votes
4answers
3k 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 ...
11
votes
4answers
3k views

When to use XML data type

I'm responsible for creating a database on a project. We have fields that are rarely going to have a value (1 in every 10,000 records) and I'm trying to work out the best way to store this in the ...
11
votes
3answers
2k views

Updating a table with millions of records, its been 4 days

I am currently updating a table with millions of records, its been 4 days and query is still executing. I checked the activity monitor its shows that query is running. In event log there is no ...
11
votes
6answers
3k views

SQL Server Checklists

Following up from my other question, I would like to start thinking about what I should take a look at on daily/weekly/monthly bases in terms of alerts. I am hoping to be able to see problems coming ...
11
votes
2answers
3k views

How can I add a rowversion column to a large table with minimal downtime

Using SQL Server 2008 and later, I want to add a rowversion column to a large table however when I simply ALTER TABLE [Tablename] ADD Rowversion [Rowversion] NOT NULL Then the table is unavailable ...
11
votes
1answer
4k views

What exactly does “No Join Predicate” mean in SQL Server?

MSDN "Missing Join Predicate Event Class" says it "indicates that a query is being executed that has no join predicate". But unfortunately it does not seem to be as easy as that. For example, very ...
11
votes
3answers
3k views

Maximum table capacity in SQL Server 2008

I have an application which inserts more than 1 billion rows annually into a table. This table contains some varchar and bigint columns and one blob column as well. The 1 billion rows consist of ...
11
votes
2answers
3k views

SQL Server VARCHAR Column Width

Searching around the web, I have found conflicting advice on whether there is a performance impact when specifying overly-wide VARCHAR columns, e.g. VARCHAR(255) when VARCHAR(30) will probably do. I ...
11
votes
1answer
1k views

What is the impact of changing the index creation memory setting in SQL Server?

I am trying to create some indexes a SQL Server 2008 database but am getting the following error message. Msg 8606, Level 17, State 1, Line 1 This index operation requires 1024 KB of memory ...
11
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3answers
2k views

Why does my ORDER BY sort two tables before the EXCEPT (slow) and not after (fast)?

SQL server 2008 R2 query optimizer puzzle We have two tables, both containing 9 million rows. 70.000 rows are different, the others are the same. This is fast, 13 seconds, select * from bigtable1 ...
11
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0answers
275 views

SQL Server Analysis Studio naive Bayes attribute has too many states [closed]

I'm using SQL Server Analysis Studio and I'm trying to train a naive Bayes classifier. I've got an attribute called "item description" that basically represents products you can buy at a store. I've ...
10
votes
5answers
3k views

Do empty columns take up space in a table?

I have table that holds from very basic info. Just a title and a few date fields. There's one field called comments which is varchar(4000) Most of the time we leave it blank, but some times will enter ...
10
votes
2answers
8k views

Performance difference between Clustered and Non Clustered Index

I was reading Clustered and Non Clustered Indexes. Clustered Index - It contains Data Pages. That means the complete row information will be present in the Clustered Index Column. Non Clustered ...
10
votes
5answers
525 views

SQL Server Backups - A couple of questions

We run our weekly backup job at 9pm on Fridays and we are experiencing a couple of issues with regard to disk space (which gets perilously low at times) and performance. We're looking at ...
10
votes
4answers
1k views

How can I write windowing query which sums a column to create discrete buckets?

I have a table which includes a column of decimal values, such as this: id value size -- ----- ---- 1 100 .02 2 99 .38 3 98 .13 4 97 .35 5 96 .15 6 95 .57 7 94 .25 ...
10
votes
6answers
2k views

SQL Server command line usage? Is it possible?

I've been trying to use the SQL Server Management Studio 2008's built in "Solution Explorer" to manage a project and after 2 weeks of struggling with it, I've decided I don't really care for it. It's ...
10
votes
5answers
1k views

UPDATE with JOIN on 100mm records, how to do this better? (in T-SQL)

I need to update 100 million records in a single table, in effect, normalizing the table by replacing the varchar value of a column with simply an ID. (I say "replacing" but really I'm writing the ID ...
10
votes
1answer
628 views

Why does 10^37 / 1 throw an arithmetic overflow error?

Continuing my recent trend of playing with large numbers, I recently boiled an error I was running into down to the following code: DECLARE @big_number DECIMAL(38,0) = '1' + REPLICATE(0, 37); PRINT ...
10
votes
3answers
2k views

SQL Profiler tutorials for newbie

The MSDN documentation tough to understand. Are there any online tutorials available to learn SQL Profiler? If possible, videos or simple blog posts would be preferred.
10
votes
2answers
415 views

@table_variable or #temp_table

I have a big user defined table type variable that has 129 columns. I will store around 2000-3000 records in this table variable at a time and pass it to various stored procedures and functions to get ...