Microsoft's SQL Server is a relational database management system (RDBMS) that runs as a server providing multi-user access to a number of databases. It originated from the Sybase SQL Server codebase, which is why both products use the extension of SQL called Transact-SQL (T-SQL).

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53 views

Does SQL Server guarantee accurate data storage? If so, how?

This question is specific to SQL Server, but other DB replies welcome. Read below for some history. My short question is, how does SQL Server guarantee that when I request "ABCDE" to be written to ...
5
votes
3answers
104 views

Interpreting an execution plan

I need some help analysing some simple t-sql execution plans. I have a table [User] with the following 3 columns: Id(Primary Key), Username(nvarchar(50)), FirstName(nvarchar(50)) I have Created an ...
11
votes
3answers
11k views

What is the difference between Shrink Database and File?

DBCC ShrinkDatabase() DBCC ShrinkFile() Do I need to run both DBCC commands in order to shrink the database? What is the difference between these two above?
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vote
1answer
514 views

Exclude .LOG file while restoring a database

I have a database backup file (MyDatabase.bak). When restoring the database through SSMS it gives me "Not enough space on disk" message. I looked for an option to exclude .LOG file from restore but ...
11
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3answers
4k views

SQL Server - Temporary vs. Physical Tables

A movement is afoot in my place of employ to move away from using #temp tables and instead to use permanent physical tables with SPIDs. Whenever one would have previously INSERTed INTO a #temp table, ...
7
votes
3answers
5k views

Performance Hit using CAST() in TSQL (SQL Server)?

We have a SQL generator that emits SQL conditional statements generically for specified fields (which for the sake of discussion: we will label as myField). So, if myField is of type NVARCHAR, we ...
1
vote
1answer
336 views

DBCC CHECKDB WITH DATA_PURITY gives out of range error

I have restore a SQL Server 2000 database onto SQL Server 2005 and then run DBCC CHECKDB WITH DATA_PURITY and I get this error: Msg 2570, Level 16, State 3, Line 2 Page (1:19558), slot 13 in object ...
1
vote
1answer
147 views

SQL Server DB Restore Clustered to Single Node?

Can you restore a DB from a SQL Server 2005 Clustered Environment (Prod) to a single server (single node) (SQL Server 2005) in Dev/Sys? Cheers, Conor
5
votes
3answers
8k views

Howto use Windows Authentication with SQL Server 2008 Express on a workgroup network?

I have two computers running SQL Server 2008 Express: c01 and c02, I setup both for remote connection using windows authentication. Worked fine for c02 but not for c01. This is the error message I'm ...
9
votes
5answers
2k views

Using IF in T-SQL weakens or breaks execution plan caching?

It has been suggested to me that the use of IF statements in t-SQL batches is detrimental to performance. I'm trying to find some confirmation or validate this assertion. I'm using SQL Server 2005 ...
2
votes
3answers
950 views

Should I be regularly shrinking my DB or at least my log file?

My question is, should I be running one or both of the shrink command regularly, DBCC SHRINKDATABASE OR DBCC SHRINKFILE ============================= background Sql Server: Database is 200 ...
2
votes
3answers
417 views

Shrink database after removing extra data [duplicate]

We have a need to fit database in 4G in order to use ms sql express edition. I started from 7G database, and found a lot of not needed records, and deleted them. After Shrink database size is 4.6G, ...
7
votes
1answer
101 views

Is there a performance hit by breaking out tables into different schemas in SQL Server?

Is there any kind of performance hit when querying by placing tables in different schemas in SQL Server. For instance if I had 2 tables, Table1 and Table2, and put Table1 into the test schema and ...
1
vote
3answers
289 views

Is there an equivalent of “OPTION(RECOMPILE)” or “WITH RECOMPILE” for an entire connection?

I'm curious. Is there any way to prevent SQL query execution plans from being cached for an entire connection's duration? Can I run a command that basically says, "use OPTION(RECOMPILE) for all ...
3
votes
2answers
174 views

Database Mirroring of SQL server

I have two databases that are mirrored to another server using database mirroring. The mirror server has to be down for some reason for few days. Now, the production server is having principal ...
2
votes
1answer
39 views

How do I list the database files contained in a SQL Server 2005 backup file using T-SQL?

How do I list the database files contained in a SQL Server 2005 backup file using T-SQL? For instance: The restore process will create: bob.mdf bob.ldf etc...
8
votes
3answers
51 views

Which is faster join

Which is faster SELECT * FROM X INNER JOIN Y ON x.Record_ID = y.ForignKey_NotIndexed_NotUnique or SELECT * FROM X INNER JOIN Y ON y.ForignKey_NotIndexed_NotUnique = x.Record_ID
42
votes
4answers
22k views

Why would SET ARITHABORT ON dramatically speed up a query?

The query is a single select containing a lot of grouping levels and aggragate operations. With SET ARITHABORT ON is takes less than a second, otherwise it takes several minutes. We have seen this ...
2
votes
2answers
64 views

query plan caching (sql server)

Is there a measure of time frame as to which the execution plan of inline queries will cached?
12
votes
2answers
26k views

Grant permissions to run an SQL server job

I have a job on my MSSQL server 2005, that I want to allow any database user to run. I'm not worried about security, since the input to the job's actual work comes from a database table. Just running ...
0
votes
1answer
910 views

Sql Server merge replication primary key violations

Using Sql Server 2008. Pretend I have a publisher and 2 subscribers A and B. The replicated table has a guid on it and also a primary key that is not the guid. Frequently, updates happen at both ...
5
votes
8answers
951 views

Granting SA privileges for Developers on the development box

In spite of our vehement protests, our management has decided that the development team must be granted 'sa' rights on the development server. The catch is that we, the DB support group are still ...
3
votes
4answers
551 views

SQL Server restore from transaction log

In SQL Server 2005, if you have a database with no backup - but it is running in full recovery mode - is it possible to "roll back" some deletes? If yes - how?
0
votes
1answer
814 views

SQL Server 2008 - Restore Database With RESTART

I am trying to restore a database from a backup file on a SQL Server 2008 instance using the following SQL command: BEGIN RESTORE DATABASE [MyDataBase] FROM DISK=@db_location WITH ...
2
votes
1answer
1k views

SQL Server Migration restore backup vs copy data and log files

Hey guys, I'm tasked with doing a SQL Server 2000 to 2005 migration. I will be doing a side-by-side migration. I've read from a few different sources that I can either: perform a backup of the ...
4
votes
3answers
44 views

What is not persisted in a database backup / restore? (SQL Server 2005)

If I take a backup of a database on a SQL 2005 Server, and then restore that backup to a different (new) database on the same database server instance, what things will not be persisted (things like ...
8
votes
4answers
177 views

SQL Server 2005/8 Query Optimisation Hints

I'm looking at educating a team on writing better SQL Server queries and was wondering what people's best hints were for improving performance. For instance I once had a DBA who insisted that ...
20
votes
6answers
15k views

SQL Server load balancing

What exists today to do Microsoft SQL Server Load Balancing on Windows Server and being transparent to any programatic access. Is this built in or does a solution have to be purchased? I'm trying to ...
3
votes
4answers
46 views

How do I guarantee data is the same after upgrading SQL Server?

I have to upgrade a database from SQL Server 7 and SQL Server 2000 to SQL Server 2008. Additionally I have to be able to prove in a court of law that the data pre-migration is exactly the same ...
18
votes
0answers
2k views

Guide to reading, comparing, and interpretting Execution Plans in SQL Server [closed]

I'm looking for a good, well-written and explained guide on reading and comparing execution plans in SQL Server. This is for more my own edification as well as for sharing with others. If you want ...
2
votes
1answer
424 views

SQL Server 2005 Express in VMware causing very high CPU load

I'm having the problems described in KB937745 - very high CPU usage and the Application Log is reporting something like this: The client was unable to reuse a session with SPID SPID, which had been ...
3
votes
1answer
158 views

Change SQL Server 2005 from Standard Edition to Workgroup

I have been tasked with performing an edition change from SQL Server 2005 Standard Edition to SQL Server 2005 Workgroup Edition, on Windows Server 2003 Standard Edition. Due to a previous failed ...
25
votes
3answers
26k views

N prefix before string in Transact-SQL query

Would you tell me, please, when should I use N prefix before string in Transact-SQL query? I have started to work with a database where I don't get any results using query like this SELECT * FROM ...
21
votes
3answers
11k views

What is lock escalation?

I was asked this question at an interview and had no answer. Can anyone here explain?
10
votes
5answers
3k views

SQL Server - separate database for reports?

On our SQL Server, we have a database for each of our web apps. For reports, we use Reporting Services and all report data (including report parameters) come from stored procedures. The stored ...
4
votes
5answers
454 views

Improving SQL Server performance on VMware under Linux

I have a Linux server in a small company (3 users) acting as a domain server and running two VMs under VMware: one has SQL Server 2000 on it and one has SQL Server 2005, in each case running on ...