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Questions tagged [sql-server]

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

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9 votes
2 answers
421 views

Shouldn't SQL Server Support RANGE?

As someone who develops websites and does a bit of SQL Server, it seems a no brainer to me that SQL Server should support a simple clause that indicates the results should only include a specific ...
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28 votes
4 answers
19k views

Using SQL Profiler on a database that's in production

As a developer, I use SQL Profiler quite often. It's a good debugging tool, both to track what my code is doing and to analyse performance problems. But I've always used it on my development ...
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6 votes
3 answers
4k views

Building Dynamic SQL-Server Where Clause

Let us review this dba.exchange Oracle question for SQL-Server. This is SaUce's code, after a little formatting: CREATE PROCEDURE GetCustomer @FirstN nvarchar(20) = NULL, @LastN nvarchar(...
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  • 11.8k
23 votes
3 answers
14k views

Find out what queries are causing the biggest amount of network traffic

On a production SQL server I am seeing intermittent enormous spikes in data traffic. Up to 200Mbit/s which is causing NETWORK IO waits which in turn cause query timeouts. How can I find out what ...
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  • 997
6 votes
2 answers
2k views

Get records between time span

I would like to retrieve records between time spans,All i have is this snippet of string indicating the time span 9:00 AM - 10:00 AM below is the table schema CREATE TABLE [dbo].[Samples]( [RID] [...
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11 votes
2 answers
3k views

How large is "too large" for SQL 2008 Web Edition?

For our soon-to-be-hosted application I need to choose between SQL Server 2008 Web edition and SQL Server 2008 Enterprise edition. There isn't any "must-have" functionality: the application currently ...
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9 votes
2 answers
2k views

Possible to run two DBCC INDEXDEFRAG commands simultaneously, each on a different table?

I am currently running a script which performs a DBCC INDEXDEFRAG on every table in a SQL Server 2005 database, one table at a time. Using DBCC DBREINDEX instead of INDEXDEFRAG is not an option, due ...
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6 votes
1 answer
204 views

Is my function nondeterministic one

I have two functions: fn_Without_Param and fn_With_Param CREATE FUNCTION [dbo].[fn_Without_Param] ( ) ... INNER JOIN .. ON .. AND SubmitDate = CONVERT( varchar(10), GETUTCDATE(), 101 ) and /* ...
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  • 6,522
0 votes
0 answers
209 views

What is the best query to use to monitor a SQL Server database's status?

I want to be able to run a query to get the crucial information about a database's status. I.e., I want the query to be able to tell what whether or not the database is in a good state. This is the ...
user avatar
21 votes
5 answers
56k views

What is the best query to use to monitor a SQL Server database's status?

I want to be able to run a query to get the crucial information about a database's status. I.e., I want the query to be able to tell what whether or not the database is in a good state. This is the ...
user avatar
12 votes
1 answer
1k views

Is there a reliable way to determine when you should run DBCC CLEANTABLE to reclaim space?

Lately, instead of just growing files when they near 80% file utilization, I've been more proactive at reclaiming space via the usual tricks like defragmenting heaps, adding & dropping clustered ...
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  • 1,068
8 votes
3 answers
421 views

Is the SQL Server IsShutdown property useful to determine whether a database is in a good state? [duplicate]

My company has a tool that monitors statuses on servers, services, databases, etc. We monitor a number of on-site servers for our customers. One particular simple check performed is to determine ...
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32 votes
2 answers
2k views

Where can I find database tuning exercises for learning?

As a developer, often DBAs take responsibility for resolving performance issues at the database level so we don't get that much experience diagnosing, tuning, refactoring queries etc. I'm looking ...
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  • 421
64 votes
12 answers
285k views

Passing array parameters to a stored procedure

I've got a process that grabs a bunch of records (1000's) and operates on them, and when I'm done, I need to mark a large number of them as processed. I can indicate this with a big list of IDs. I'm ...
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  • 1,007
8 votes
1 answer
617 views

Full Plan Cache Behavior

In SQL Server 2005, what happens when the plan cache fills up? I have done some research, and from bits and pieces gathered it seems that cached plans are given an "age" that consists of it's weight, ...
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  • 3,374
4 votes
2 answers
178 views

Randomizing table contents and storing them back in the table

I have a table with at least a million records in it. These rows were created by a custom app that reads several SharePoint site collections and stores the item urls in the table. Now, since we read ...
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  • 143
13 votes
4 answers
6k views

SQL Server Management Studio for a remote database

With a SQL Sever database which is on a remote hosted dedicated server I can work using SQL Server Management Studio installed either on the same server or on my local computer. I the first case I ...
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  • 1,505
12 votes
2 answers
2k views

Unique Constraints on Nullable Columns in SQL Server 2005

In this one project I am working on, I need to set a particular field to be unique (not a problem!) but if the field is null I want the constraint to be ignored. In Sql Server 2008 I use filtered ...
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  • 508
39 votes
4 answers
8k views

On a dedicated database server, how much memory to reserve for the OS?

Assuming you have a dedicated server explicitly for database functions -- how much memory should you reserve for the operating system? I realize this will probably vary somewhat depending on the ...
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  • 2,314
5 votes
3 answers
1k views

Best solution for High Availability and SSRS on SQL Server 2008 R2?

I have 2 Physical Servers with SQL Server 2008 R2. – SQL Server 1(Active) & SQL Server 2 (Passive) Web Application is developed using .Net 4.0 Framework. I want to know the best solution to have ...
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12 votes
3 answers
20k views

How do you clear out all old query plans from within Microsoft SQL Server?

We have an off the shelf application that uses a Microsoft SQL database. Within this application we pick and choose various selection criteria for each report. This application then runs these reports....
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4 votes
2 answers
434 views

How to compare performance of two versions of a function?

I just saw this function definition: create function dbo.f (@a int, @b int) returns integer as begin return case when not exists (Select * from t1 where t1.col1 = @a) AND @b &...
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  • 11.8k
241 votes
18 answers
117k views

How do you document your databases?

I find that most of my clients are not documenting their databases at all and I find that pretty scary. To introduce some better practice, I would like to know what tools/process people are using. ...
41 votes
4 answers
166k views

How do I list or search all the column names in my database?

I want to search for a string in the names of the columns present in a database. I’m working on a maintenance project and some of the databases I deal with have more than 150 tables, so I'm looking ...
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  • 625
30 votes
4 answers
66k views

How can I tell WHY an insert on a certain table is slow?

I know that an INSERT on a SQL table can be slow for any number of reasons: Existence of INSERT TRIGGERs on the table Lots of enforced constraints that have to be checked (usually foreign keys) Page ...
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  • 9,594
10 votes
6 answers
4k views

What security threats does the SA account and other known account names pose to security?

Does an known account name like sa, pose a security threat to database? When using windows authentication on SQL Server does it impose the same password policy(if it was set to say account lockout ...
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  • 533
0 votes
3 answers
386 views

Is Oracle not suited as the database behind websites like Stackoverflow? [closed]

I see from the thread Which tools and technologies build the Stack Exchange Network? that the database specifications are: Database SQL Server 2008 R2 running Microsoft Windows Server 2008 ...
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  • 3,251
11 votes
2 answers
231 views

Is there anybody using the SQL Server feature to create groups of stored procedures differentiated by number?

The question refers to the number parameter in this msdn documentation If you don't you can create multiple stored procedures in SQL-Server differentiated by number and drop them with a single drop. ...
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  • 11.8k
10 votes
2 answers
5k views

What is the meaning of DOP in the context of SQL Server?

What is the meaning of DOP in the context of sql server?
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  • 997
12 votes
1 answer
3k 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 per ...
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  • 997
7 votes
2 answers
8k views

SQL Server 2008 log files have minimum sizes, what gives and how do I make them smaller?

Ok, to start with, I screwed up when I created the databases, using a create script roughly like so: (artificial linebreaks and names/paths for wrapping purposes) CREATE DATABASE [EXAMPLE] ON ...
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  • 6,198
51 votes
8 answers
137k views

How do I shrink all files quickly for all databases?

In SQL Server (2008 in this case) how can I quickly shrink all the files, both log and data, for all databases on an instance? I could go through SSMS and right click each and choose Tasks -> Shrink, ...
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  • 6,198
4 votes
2 answers
2k views

How do I stop refresh conflicts between Proactive Caching of facts and timed refresh of Dimensions in a SQL Server Analysis Service 2005 OLAP cube?

I have a SSAS 2005 OLAP cube which we've very nearly made into a ROLAP cube using a mixture of proactive caching for the fact partitions and timed refreshes for the dimension data. There are two fact ...
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  • 632
27 votes
4 answers
68k views

How to change SQL Server collation

How could I change the SQL Server 2008 R2 Express Default Collation for the whole server and a particular database? Is there a way to do it using visual interface of SQL Server Management Studio? In ...
user avatar
  • 1,505
28 votes
3 answers
37k views

Code to simulate deadlock

I am testing my application I need some code that stable simulates the deadlock on database site (sql script if possible). Thank you. ADDED: Reproducing deadlocks involving only one table
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  • 6,522
8 votes
2 answers
1k views

Is this a new common pattern in Oracle Where exists ( Select NULL FROM...)?

Years ago, it was common to write where exists (Select * from some_table where some_condition) Last year I noticed that many t-sql scripts switched to using the number 1 instead of the star where ...
user avatar
  • 11.8k
15 votes
5 answers
15k views

Does it make sense to use SQL Server's bracket notation in hand written code?

Code generators tend to be simpler when they generate output using the new Microsoft bracket notation ([]) for nearly everything. When I first saw it, I though wow a reincarnation of the somewhat ...
user avatar
  • 11.8k
148 votes
6 answers
128k views

Guid vs INT - Which is better as a primary key?

I've being reading around reasons to use or not Guid and int. int is smaller, faster, easy to remember, keeps a chronological sequence. And as for Guid, the only advantage I found is that it is ...
user avatar
  • 3,113
25 votes
3 answers
5k views

Which collation should I choose for a muiti-language website?

Does a collation have any influence over a query speed? Does the size of a table change depending of the collation? If I want to build a website that must support all possible languages (lets take ...
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  • 3,113
13 votes
1 answer
1k views

SQL Server - How are data pages stored when using a clustered index

I recently heard that the data pages in a clustered index aren't stored contiguously. Is this true? Perhaps data pages are normally stored contiguously with some exceptions to the rule? Or perhaps I ...
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  • 233
22 votes
2 answers
3k views

Do I need separate indexes for each type of query, or will one multi-column index work?

I somewhat know the answer to this question already, but I always feel as though there is more I need to pick up on the topic. My basic understanding is that generally speaking, a single index that ...
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253 votes
6 answers
123k views

When should I use a unique constraint instead of a unique index?

When I want a column to have distinct values, I can either use a constraint create table t1( id int primary key, code varchar(10) unique NULL ); go or I can use a unique index create table t2( id ...
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  • 11.8k
57 votes
6 answers
75k views

What are the main causes of deadlocks and can they be prevented?

Recently one of our ASP.NET applications displayed a database deadlock error and I was requested to check and fix the error. I managed to find the cause of the deadlock was a stored procedure that was ...
user avatar
  • 4,362
123 votes
7 answers
135k views

How to determine if an Index is required or necessary

I've been running an auto-index tool on our MS SQL database (I modified a script originating from Microsoft that looks at the index statistics tables - Automated Auto Indexing). From the stats, I now ...
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  • 1,333
6 votes
2 answers
2k views

Dropping duplicate|redundant Unique Constraint from FILESTREAM table

I have a table with a FILESTREAM column, and it has two unique constraints specified for the same FILESTREAM column, ie: ALTER TABLE [dbo].[TableName] ADD CONSTRAINT [...
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3 votes
1 answer
1k views

SQL 2005: logical consistency-based I/O error: incorrect checksum

I got this error this morning during the execution of a SSIS package: SQL Server detected a logical consistency-based I/O error: incorrect checksum (expected: 0x5fb84eb5; actual: 0x7fb84eb5). It ...
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  • 133
39 votes
2 answers
123k views

How do you stop, take offline, and delete a SQL Server database in recovery?

I have a development database which has entered recovery mode on restart, and has been recovering for the last hour or so. I need to either stop the recovery, or kill it in some way. I don't care ...
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5 votes
5 answers
23k views

How do I restore a SQL Server 2000 database to a SQL Server 2008 instance?

How do I restore a SQL Server 2000 database to a SQL Server 2008 instance?
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  • 149
2 votes
1 answer
3k views

SQL Server 2005 query erroring with message 7105, slot for LOB data type node does not exist

SQL Server 2005 sp3 Standard on 64-bit Windows Server 2008 inconsistently receiving an error that seems to indicate corruption select * from some_table where text_field like ‘%the fox did not go ...
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  • 263
0 votes
1 answer
141 views

SQL Server Point in Time Restore Scenario

Hopefully you can help out on this as I may be up a creek! I am working with a database using the FULL recovery model. The database has had nightly database backups but their transaction log has ...
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