What is exactly STATISTICS in SQL Server

hi all,
What is exactly STATISTICS in SQL server query optimiser ?
Thanks
Selva

Some good content with proper example can help you for sure.
Link:
http://blog.idera.com/sql-server/understanding-sql-server-statistics/
Some part of text may give you idea
If there’s an upcoming election and you are running for office and getting ready to go from town to town city to city with your flyers, you will want to know approximately how many flyers you’re going to bring.
If you’re the coach of a sports team, you will want to know your players’ stats before you decide who to play when, and against who. You will often play a matchup game, even if you have 20 players, you might be allowed to play just 5 at a time, and you will
want to know which of your players will best match up to the other team’s roster. And you don’t want to interview them one by one at game time (table scan), you want to know, based on their statistics, who your best bets are.
Just like the election candidate or the sports coach, SQL Server tries to use statistics to “react intelligently” in its query optimization. Knowing number of records, density of pages, histogram, or available indexes help the SQL Server optimizer “guess”
more accurately how it can best retrieve data. A common misnomer is that if you have indexes, SQL Server will use those indexes to retrieve records in your query.
Not necessarily. If you create, let’s say, an index to a column City and <90% of the values are ‘Vancouver’, SQL Server will most likely opt for a table scan instead of using the index if it knows these stats......
Santosh Singh

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What is the difference between SQL Server 2012 R2 & SQL Server 2014

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SQL Server Software ISO, How to find out what is the Edition and Version of the SQL software before starting installation

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Detail explanation is appreciated.
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@Balmukund - Thanks for the input - That one is a nice blog!
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Conversion of SQL Server UDF to Oracle

Hi,
I hope this is the right place to post this question.
We are migrating a number of applications from SQL Server to Oracle, so my exposure/experience in Oracle is very limited.
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Alan, 3720, 3730, 3740
Anna, 5045
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SELECT name,
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KEEP (DENSE_RANK LAST ORDER BY curr),',') AS CC_Code
FROM (SELECT name,
cost_centre_code,
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and mnt_cost_centre_staff.association_flag = 'S'))
GROUP BY name
CONNECT BY prev = PRIOR curr AND name = PRIOR name
START WITH curr = 1;
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select MNT_USER."NameSecondary"
FROM (select * from mnt_staff, mnt_cost_centre_staff
where MNT_STAFF.employee_number = MNT_COST_CENTRE_STAFF.employee_number
and mnt_cost_centre_staff.association_flag = 'S');
I get the following error
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at "MNT_USER.NameSecondary", line 6
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Action: Rewrite the query or change number of rows requested
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"to declare the select statement as a cursor, and a variable type ref cursor to
hold the results and return them to the caller (as an out parameter)" but am lost as to what/how to do this.
Any suggestions gratefully received.

What you posted as a SQL Server function is not a SQL Server function. Neither is your Oracle SQL statement a function. A function, in Oracle, takes one or more parameters (IN, OUT, or IN OUT) and returns one and only one value unless it is a pipelined table function.
To learn about Oracle functions
http://www.psoug.org/reference/functions.html
What is appears you have done is repeat a very common error which is to think that because you know a Microsoft product you can pick up an Oracle product, having not read the concepts and architecture docs, having not taken a class, and having not studied the subject, just start banging out code: It does not work that way.
Your SQL statement, NOT A FUNCTION, is this:
select MNT_USER."NameSecondary"
FROM (
select *
from mnt_staff, mnt_cost_centre_staff
where MNT_STAFF.employee_number = MNT_COST_CENTRE_STAFF.employee_number
and mnt_cost_centre_staff.association_flag = 'S');and none of us can fix it because none of us can do more than guess as to what is specifically wrong though at the same time I can easily state that it appears that a lot of it is wrong. What is the point of creating an in-line view when all you really seem to want is:
SELECT mnt_user NameSecondary
FROM mnt_staff ms, mnt_cost_centre_staff mc
WHERE ms.employee_number = mc.employee_number
AND mc.association_flag = 'S';

Is SQL Server the new Access?

This is a condensed summary of the job market as I've been observing it so far this year and maybe in retrospect last year too. It may or may not be appropriate to this forum, if you are reading it then so far maybe it has relevance.
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One additional small attempt at forum relevance: insofar as this market shift might be true, I would attribute it to two engine-related things. First, the very unfortunate decision by Microsoft that for SQL 2012 licensing for big multicore servers
became far more expensive. It seems many shops stayed on SQL 2008 for a long time (still!) because of this and have barely looked at SQL 2014. Second is that frankly SQL Server is not scaling very well beyond the terabyte range without a lot of
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apps and is leading to new choices in platform.
Anyone else have any observations along these lines, pro or con?
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Josh
*and if you think that's a myth, it is exactly what happened at my last gig, leading to $20,000,000 in development being thrown away - and no, they simply could not be talked into understanding or mitigating the issue.

Josh,
I would think most of this is going to depend on the company, resources, and business models. I added my 2 cents though, enjoy.
But it appears to me as if virtually all new, large-scale work is being moved off of SQL Server and onto cloud and "big data" platforms possibly (but not frequently) including Azure.
I personally don't look at Azure as a big data platform. Currently it has its limits in both processing power and disk IO, has its own issues (such as AD integration, which is possible but takes extra hardware and setup) and has an SLA that you may or may
not be able to live with.
Do I see more things moving Azure - yes, but it's mostly because they are small and is based on cost + expertise. Most of the time there is no in house DBA and it is cheaper to have some other company worry about hosting it, providing the services, hardware,
power, etc. You get redundancy and an out of the box SLA for small applications that are fractions of the cost compared to the licensing + hardware + personnel costs of in-house items.
Remember when everything was run on mainframe, then personal computers came out, now everything is migrating back toward a mainframe feel. It is just how it cycles. "on prem private clouds" are nothing more than beefy hardware with a single purpose all packaged
together (such as offering from HP and Dell) and something a shop of sufficient size can do on their own with enterprise class hardware - again if you have the space and expertise.
What is being left on SQL Server are legacy systems and smaller applications where generalist developers can totally fend for themselves, with the help of a competent DBA platform staff, and just let the power of the hardware overcome any technical
issues. Most of these apps seem to be whatever fits on a standard version and runs under a VM. In effect, SQL Server is becoming the new Access!
This could just be the company that you work for, or someone up higher that hears a key word and latches on. I can tell you that I'm actually in the process of migrating multiple Oracle databases to SQL Server with application upgrades. That isn't counting
the other databases that are currently SQL Server at 1TB+ but it depends on what is considered a small application. To a small company almost all applications are large, versus a large company with 10k+ employees and then anything less than 1k+ users is small.
It also depends on if you're a dev shop or a 3rd party shop. For example, we bought software that runs on a closed source version of MySQL. It happens, that's what they use.
First, the very unfortunate decision by Microsoft that for SQL 2012 licensing for big multicore servers became far more expensive. It seems many shops stayed on SQL 2008 for a long time (still!) because of this and have barely looked at SQL 2014.
Yeah, this made me sad. Following Oracle and IBM was not the way to go, but not our decisions. The interesting thing is, if you read the licensing doc, anything you have with SA can be converted to cores so it isn't a total loss and shouldn't be a reason
to stay at older versions. I still have instances of 2000 running (omfg) that are somehow alive... it's because the software company is no longer around yet we still use that product, not because we don't want to upgrade (read WE as I insist harshly). In fact
I just had an install guide emailed to me about a possible new product and their "supported" version of SQL Server was 2005 SP3, it's all about what they develop on and if they test it on newer versions. Since that takes money most of the time they don't and
it makes me sad with a few drops of angry and then tons of push back until they support something newer.
This is how it will be especially in regulated markets such as stock trading and gambling where products must be "approved" by the boards or commissions before it can be used. I liked to joke that dev shops were 4 years behind, retail and hospitals were
8 years behind and the government still uses pencil and paper.
Second is that frankly SQL Server is not scaling very well beyond the terabyte range without a lot of high-levels of expertise involved - and especially when cheap management tries to run that multi-terabyte database on 32gb production servers!
That is a huge "it depends", I'm not even going to try and lsit the myriad of items that can attribute to this. Very rarely when I am investigating is this an issue to scaling with SQL Server. Most of the time I find two main culprits - the first is a database
design that is terrible and leads to the problems at hand or the other being an application that doesn't properly use the database. When I say properly, I mean HOLDLOCK hints hard coded into application queries and then wondering why concurrency is terrible.
The developers just don't know, understand, or care as their job is to ship a product.
If it makes you feel any better, I have successfully run (for years) a 1+ TB db on a server (2008) with 16 GB of RAM. The database lends itself to the type of workload that doesn't require extremely large datasets in memory and is more of an oltp style with
large and long archives. This is why I say "it depends", because not every database is equal.
Anyone else have any observations along these lines, pro or con?
There will always be a new technology and change in the wind. That's inevitable. Some companies and execs understand this and take caution, some stick to old school (still have AS/400 style batch processing for "real-time" data), some always jump on the
newest thing. YMMV.
I look at it as another tool available to us.
Sean Gallardy | Blog |
Twitter

Resisting the creation of new log files when SQL SERVER is restarted

Hi,
I know that when SQL server is restarted new log files are created. But is it possible to resist creating new log fils and insert log data in the existing log files that are used before restarting the sql server

Hello,
I guess Raghvendra answered your question. And as per your previous post its not clear what you want to ask an you did not revert. Again if your issue is solved appreciate if you can please mark the answer and vote the posts helpful.
Can I continue to log in the same file.?
What does this line mean exactly ? Yes SQL Server will continue to use same transaction log file(LDF file) for writing information as it was using before shutdown. If you are talking about errorlog file a new errorlog file would be created which you can
read using
sp_readerrorlog
Even if you stopped SQL Server service mistakenly its not that server is gone. Yes when you stopped the server all inflight transactions are rolled back. And when SQL Server would come online it would undergo crash recovery and would bring all the databases
online by reading transaction log file and performing redo and undo of information. All committed transaction would be rolled forward and uncommitted would be rolled back.
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
MVP

SQL Server 2008 Express SP1 installation failed

Hello guys,
System Info:
Windows 7 64Bit.
Scenario: I have an application, while installation it installs SQLServer 2008 instance with some xyz database name.
Issue: The system already has the SQLServer 2008 R2, and now I am trying to install the application but the SQLServer instance of my application is not getting installed, its giving error saying that the installation failed.
The error code is :
0x84B40000
The below is the log file data.
07/07/2014 16:15:14.283 ======================================================================
07/07/2014 16:15:14.283 Setup launched
07/07/2014 16:15:14.298 Attempting to determine media source
07/07/2014 16:15:14.298 Media source value not specified on command line argument.
07/07/2014 16:15:14.298 Setup is launched from media directly so default the value to the current folder.
07/07/2014 16:15:14.298 Media source: c:\80424454fe36892978\
07/07/2014 16:15:14.298 Attempt to determine media layout based on file 'c:\80424454fe36892978\mediainfo.xml'.
07/07/2014 16:15:14.361 Media layout is detected as: Core
07/07/2014 16:15:14.361 Media LCID is detected as: 1033
07/07/2014 16:15:14.361 Media is a slipstream package
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07/07/2014 16:15:14.376 Attempting to find media for .Net version 2.0
07/07/2014 16:15:14.376 .Net version 2.0 is installed
07/07/2014 16:15:14.376 RedistMSI::GetExpectedBuildRevision - Setup expects MSI 4.5.6001.22159 at the minimum
07/07/2014 16:15:14.376 Attempting to get Windows Installer version
07/07/2014 16:15:14.376 Windows Installer version detected: 5.0.7601.17807
07/07/2014 16:15:14.376 RedistMSI::IsVistaRTM - Not Vista RTM build
07/07/2014 16:15:14.392 Required version of Windows Installer is already installed
07/07/2014 16:15:14.392 Current running setup.exe full path: c:\80424454fe36892978\setup.exe
07/07/2014 16:15:14.392 Media setup.exe file version detected: 2007.100.2731.23
07/07/2014 16:15:14.392 Locally installed setup.exe full path: c:\Program Files (x86)\Microsoft SQL Server\100\Setup Bootstrap\Release\setup.exe
07/07/2014 16:15:14.408 Local setup.exe file version detected: 2007.100.2731.23
07/07/2014 16:15:14.408 Local setup.exe version 2007.100.2731.23 is equal or greater than media version 2007.100.2731.23, so re-launching setup.exe from local
07/07/2014 16:15:14.408 Media source: c:\80424454fe36892978\
07/07/2014 16:15:14.408 Install media path: c:\80424454fe36892978\x86\setup\
07/07/2014 16:15:14.423 Media layout: Core
07/07/2014 16:15:14.423 Attempting to get execution timestamp
07/07/2014 16:15:14.423 Timestamp: 20140707_161514
07/07/2014 16:15:14.439 Attempting to launch local setup.exe
07/07/2014 16:15:14.439 Attempting to launch process c:\Program Files (x86)\Microsoft SQL Server\100\Setup Bootstrap\Release\setup.exe
07/07/2014 16:15:38.962 Process returned exit code: 0x84B40000
07/07/2014 16:15:38.962 Local setup.exe returned exit code: 0x84B40000
07/07/2014 16:15:38.962 Setup closed with exit code: 0x84C40013
07/07/2014 16:15:38.962 ======================================================================
Please do reply if anyone knows how to fix this issue.
Thanks,
Shiv
0x84B40000

Hi,
You can install SQL server express 2008 on machine having SQL Server 2008 r2 is supported. From what you posted I guess SQL server 2008 r2 is default instance so you need to install SQL server 2008 express SP1 as named instance. Your error matches problem
mentioned in below thread
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/1e8cfab3-4b99-4b4d-82bf-97799dabe34c/failure-when-installing-from-command-prompt-config-file?forum=sqlexpress
If issue is not solved please post complete log files from location
%programfiles%\Microsoft SQL Server\100\Setup Bootstrap\Log\.
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it.
My TechNet Wiki Articles

SQL Server Express compatibility with Windows 8.1 - Which version(s) are compatible?

We have purchased a new computer that has Win 8.1 Pro. We are migrating an application from a Win 7 Pro machine we are currently successfully using (the vendor migrates it for us) and they have said that the application will require the installation of SQL
Server 2008 Express (which we do have on our Win 7 machine).
In looking at the requirements for SQL Server 2008 Express (on the download page for it), it does not mention it being compatible with Win 8.1
In addition, Installation Instructions says that it requires:
Microsoft .Net Framework 3.5 SP1
Windows Installer 4.5.
Windows PowerShell 1.0
I see that 3.5 is already listed as a program feature of Win8.1 and I've enabled it. Do I need to install SP1? I downloaded it, and launched it, and nothing happened.
I also looked at the Windows Installer 4.5 download page, and it's not clear if that is compatible with 8.1. Do I need to download and install it?
Power Shell 2.0 is already installed. I assume that will be backwards compatible with PowerShell 1.0; is that correct?
I saw another question about SQL Server Express Compatibility with Win 8.1 (http://social.technet.microsoft.com/Forums/windows/en-US/038ec00e-4fc1-41ba-9fdc-21c022aad67e/action?threadDisplayName=sql-server-express-compatibility-with-windows-81) and the response
said that SQL Server Express 2012 will work, but the link contained in the answer led to a page for SQL Server Express 2014.
My vendor has told me that SQL SERver Express 2012 will be backwards compatible with their product. But they said that I would first have to install 2008 first. Is that correct for Win 8.1?
So, the ultimate questions are:
1. What is the link for Sql Server 2012 Express for Win 8.1?
2. Will the SQL Server 2012 Express download require prior install of the 2008 version
3. What other component requirements are required for SQL Server 2012 Express, and how can I determine if they have already been installed. (This is a brand new computer with a clean Win8.1 Install).
4. Finally, can we use the 2014 version of SQL Server Express for Win 8.1? If so, questions 1, 2 and 3 apply, too.
Thanks for your help on this!! HIGH ANXIETY.

Hello,
The following article provides which updates are required to make SQL Server versions compatible with Windows 8 or 8.1:
http://support.microsoft.com/kb/2681562/en-us
1. You can use the product updates feature on SQL Server 2012 to make it compatible with Window 8.1. Apply SP1 as described on the following
article:
http://www.sqlcoffee.com/SQLServer2012_0008.htm
2. No.
3. Download and install .NET Framework 4.0 and enable .NET Framework 3.5. For more information:
http://www.sqlcoffee.com/SQLServer2012_0017.htm
4. Yes, you can use SQL Server 2014 with Windows 8.1. Please refer to the Support article provided above.
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com

Open Connection to SQL Server 2000 Instances

Dear All:
I always got following error when connecting to a SQL Server 2000 instance:
"Can't open a socket on NAMNGO\RNDSQLSVR:1433. Check host and port number and
make sure the
security manager allows this connection. You can also try running the SocketApplet
(java.net.UnknownHostException:
NAMNGO\RNDSQLSVR)"
I am using Wel Logic 6.1 and SQL Server 2000. SQL Server 2000 has an instance
named RNDSQLSVR with default TCP port is 1433.
Is there anyone hit this problem, please let me know.
Please check the attached file for sample code.
Thanks,
Nam Ngo
[att1.html]

Hi Sree,
Thank you for your help. It worked.
Nam Ngo
"Sree Bodapati" <[email protected]> wrote:
Hi Nam,
The way you do this is by finding out on what port the instance of SQL
Server you want to connect is listening on. (Use the server network utility
that comes with SQL Server 2000 for this). Then just mention the
server=<machine name/ip> of the server this instance is running on. and
the
port as the port that is shown by the server network utility as port=<port
number>. Microsoft specifies NAMNGO\RNDSQLSVR:1433 as the convention
for
ODBC but , this driver is a type 4 driver and it needs only the machine
name
and port, it doesnt need any instance name.
(Each instance of SQL Server 2000 listens at a different port)
HTH
sree
"Nam Ngo" <[email protected]> wrote in message
news:[email protected]..
Dear All:
I always got following error when connecting to a SQL Server 2000instance:
"Can't open a socket on NAMNGO\RNDSQLSVR:1433. Check host and portnumber
and
make sure the
security manager allows this connection. You can also try running theSocketApplet
(java.net.UnknownHostException:
NAMNGO\RNDSQLSVR)"
I am using Wel Logic 6.1 and SQL Server 2000. SQL Server 2000 has aninstance
named RNDSQLSVR with default TCP port is 1433.
Is there anyone hit this problem, please let me know.
Please check the attached file for sample code.
Thanks,
Nam Ngo

What is exactly STATISTICS in SQL Server

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