DB Engine :: Why Does Server Group Pages Into Extents
Jul 24, 2015
I am reading the official documentation on pages and extents. I've also read an article on the official SQL Server Blog (sadly, I can't link as a new member). These articles do a good job explaining what an extent is.Why use extents at all?I can't find a good example anywhere of how grouping pages into extents make SQL Server work more efficiently. Any good example of what SQL Server would be missing if it didn't have extents at all, and how extents fix this?
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Mar 16, 2008
hi all!
i'm not sure that i understand how sql server stores data.
in documentation, i found that sql server stores data in pages.
every page have size of 8192 bytes (8060).
as i understand well, every table row is stored in one page. also, every table row can not be larger then one page. and that's where my confusion starts - because it sounds like we can not have data in table that is larger then 8060.
please, if you can you help me to understand this.
thank you in advance!
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Nov 27, 2007
Hi!
I've posted a feedback with Microsoft to see if we can get them to fix the issue described below, but so far no one from Microsoft has commented to let us know what they're doing about this problem! I'm posting this here to see if maybe we can get more people to rate this feedback or chime in on what a pain it is! Please feel free to add your own comments or how you had to work around this issue and whether or not you think this is something Microsoft should be addressing NOW.
https://connect.microsoft.com/SQLServer/feedback/ViewFeedback.aspx?FeedbackID=311679
Provide Individual Page Numbering per Group and Total Pages per Group
Currently in a Reporting Services report, you can't readily reset the page number for each group in a table, nor can you display the total number of pages per group. For example, if I'm printing invoices and each invoice is a separate group, I'd like to be able to print "Page 1 of 5" , "Page 2 of 5" etc. for the first invoice, then "Page 1 of 3" when the next invoice begins, and so on. This was easy in Crystal Reports. I realize that Crystal Reports has a two-pass process that enables that kind of pagination. However, this is REALLY important functionality that's just missing from Reporting Services and I'm hoping you'll provide it REALLY SOON! Yeah, I know there are work-arounds if you can know exactly how many rows of information there are on each page. But gosh! That's not practical, especially if you have second level groups inside the main group or text blocks in rows that can 'grow' to more than one line. I've read a couple of work-arounds, but none of them works correctly and consistently when more than one user is running the same report or when you print the report while you're looking at it on the screen. I still may need access to the overall report page number and the overall total number of pages, so don't get rid of that. It's just that if you're doing this already for the entire report, I don't see why you can't do it per group! Lots of people have been asking for this for years, and I don't understand why it hasn't been implemented.
I've read a few articles on this topic, but no one has come up with a decent work around. My theory is that Microsoft should be addressing this immediately. This is major functionality that's just plain missing from SSRS and should have been there from the start. If anyone from Microsoft can let us know what's going on with this issue or if anyone would like for me to clarify this further, feel free to let me know.
Thanks!
Karen
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Nov 19, 2015
In SQL Server, is there a way to list all the data pages, index pages, IAM pages, etc. for a given user table? Like this:
Data pages: (1, 200), (1, 201)
Index pages: (1, 202)
Or if that is impossible, then is it possible to list only the data pages for a table?
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Apr 22, 2008
Like many others, I have a large report that groups on invoices, and does a page break between each invoice. From reading other posts in this forum, I was able to reset the page number on the grouping, however, there are some things that I need to display only on the last page of each invoice, but I don't see how I will be able to determine when I'm on the last page for a particular invoice. Can I somehow determine up front the number of pages for a group so I know when I'm at the last page?
Any help is greatly appreciated!
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Jan 7, 2008
It is using a table to display a very large amount of data (a basic list of information) with groups. Each of the groups can span multiple pages, so the user may not realize where the grouping actually began (I am repeating the group headers). Therefore, I would like to modify the group header when it is repeated across multiple pages by simply adding the text, "(cont.)" to the header so the reader can easily see that the group started on a prior page. There does not appear to be any standard test function for this condition. Using Previous() for this case does not work. This cannot be a new issue and must have been solved; any help with this would be greatly appreciated. Sorry if this has been asked before, I did search the forum but could not find an answer to this question...
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Feb 14, 2008
Friends,
I am using SSRS (Sql server reporting services) for one of my report related to EIS-MIS.
i want group wise page numbering and also display the no. of pages for that particular group.
e.g suppose group 1 has 5 pages then it should display
page no. 1 /5, 2/5,3/5,4/5, 5/5. now suppose group change then it shold display 1/4 like this
I have already implemented groupwise page numbering using then custom code and i have call that function from the header portion of the report.
now the question is how can i display the total no. of pages in particular group?
For that i have add one count column in query itself but as we know we can't use field value in header and footer portion and also we can't use global variables in data portion.
So kindly guide me
Thanks,
Manoj Patel
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Oct 2, 2014
in microsoft doc there is written on the topic of BP Extensions with SSD's in SQL Server 2014: only clean pages are written to disk... does this mean data pages that have not been modified yet? or also those data pages that have already been modified, and where log has finished writing and the transaction has been marked as commited??
why are there clean data pages being written to L2 cache to make space for other not modified pages? I mean, shoudnt they be modified first, before letting other unmodified data pages into the Cache? I mean they have still to be modified..that makes no sense to me to page them out and page them in again just for other data pages...
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Sep 11, 2015
I found one database in availability group state change automatically. I found ERR started at
0000233c.00002848::2015/09/11-03:51:09.840 ERR [RES] SQL Server Availability Group: [hadrag] ODBC Error: [HYT00] [Microsoft][SQL Server Native Client 11.0]Query timeout expired (0)
And I use google to search and found the link below. It indicated a network issue. Is it the source of the problem. By the way, My failure Condition Level is 1 and I have increased Health Check Timeout from 30,000ms to 150,000ms just now. [URL] ...
--- SQLDIAG ---
cluster log in UTC+8:
0000233c.00002848::2015/09/11-03:51:09.840 INFO [RES] SQL Server Availability Group: [hadrag] SQLMoreResults() returns -1 with following information
0000233c.00002848::2015/09/11-03:51:09.840 ERR [RES] SQL Server Availability Group: [hadrag] ODBC Error: [HYT00] [Microsoft][SQL Server Native Client 11.0]Query timeout expired (0)
[Code] ...
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Nov 25, 2002
Where should i start to try and fix some unalocated extents?
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Jul 29, 2002
Hi all,
I have started to look at the way our production DB has been defined and set up, with the view to improving performance.
The DB is now 11gb, and the original size was set up as 3000mb, the rest has been take in 10% additional extents.
Now, back in my DB2 DBA days, this was a bad thing to have any data spread across extents as they may not be contiguous. I am assuming that is the same with SQL Server. Can someone confirm/deny this?
If this is the case, how can I get the DB back into one primary partition?
Thanks in advance.
Mike
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Feb 9, 1999
When running the DBCC newalloc command I get some errors like the following:
"extent 51400 is in the wrong segment"
"chain processed with bad segment for object 448004627"
I've checked the system tables and system stored procedures and see no reference to page numbers being mapped to segments or identifying which extents are associated to which tables. I'm trying to determine which pages are associated with these extents so that I can print them to view the content. Any ideas how to determine the page numbers associated with extents and which extents are associated with each table?
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Feb 24, 2015
I'm looking for hints/tips/url for a script which can be run a few times per day and either sends an email or alert for the following condition:
Script would function like:
[URL]
Databases - Dynamic Log File Growths Remaining Alarm
Dynamic Log File Growths Remaining alarm becomes active when a non fixed size log file in any database is in danger of running out of space to grow. It is raised when a log file is almost full and the file cannot automatically grow enough to relieve the problem.
We have our databases with Enable Autogrowth (in Megabytes), and then a Maximum File Size (Limited to a MB value).
Example: If one of the database logs (or possibly filegroup primary) picks up another extent and is about 5 extents (arbitrary value) away from running out of growth room, an alert would be sent to an email address/profile.
P.S. Yes, there are multiple databases on this one instance and the script should loop to run through all of them.
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Jul 20, 2005
is there a setting that will ebnable uniform extent allocation uponcreation of index/table by default ?if there isn't any default setting can you code it in?thanks,Doron
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Jul 6, 1999
Does anyone know a workaround for the code page translation that occurs if you use bcp to
transfer data in and out of SQL Server. I have a table that I am losing certain characters in the
transfers.
SQL Server 7.0 has the -C code page specifier added to BCP to address this but I am running 6.5 currently.
Any ideas on how to deal with this?
Thanks,
Phil
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May 27, 2008
Dear guys
I need to connect to a database from my asp.net page through internet. I encrypt sensitive data before sending them on the net. but I think about a more basic problem: what happens to login data when transfered on the net? I mean, if user name and password are captured by hackers, they can make more serious problems than they find some sensitive data. what shall we do? is there any way for securing sql server login itself?
Regards
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Jan 10, 2014
I'd like to ask how you would get the OUTPUT below from the TABLE below:
TABLE:
id category
1 A
2 C
3 A
4 A
5 B
6 C
7 B
OUTPUT:
category count id's
A 3 1,3,4
B 2 5,7
C 2 2,6
The code would go something like:
Select category, count(*), .... as id's
from TABLE
group by category
I just need to find that .... part.
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Oct 28, 1999
I cannot connect my ASP pages to my SQL Server 6.5 Database. I've got a login error.
Any idea?
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Jul 20, 2005
Dear All,I have developed a Data Access Page with Access as a project. It isconnected to a SQL-Server database. I try to edit the data in the table andam not able to do so. I might be missing some permissions. I have changeda number. What am I missing?Thanks in advance.Jeff Magouirk
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Aug 1, 2007
Hi every body
I have developed an reporting solution for a customer with reporting services and using report builder.
When he connect to http://localhost/reports , he see the page like
http://img215.imageshack.us/img215/583/folderhl1.jpg
But i would to custom design of my default page, and other maybe. Where i can do it ?
Thanks all
Regards
Erwan Sarcelet, France
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Jun 15, 2008
hi,i'm new to deploying asp.net pages with built in asp.net login controls over the web server. i've uploaded my asp.net pages with web.config and placed my ASPNETDB in App_Data folder on the webserver as it was placed in local machine. but it dint work and displayed the following error
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:
[SqlException (0x80131904): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +735123
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) +820
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +130
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
System.Web.DataAccess.SqlConnectionHolder.Open(HttpContext context, Boolean revertImpersonate) +84
System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) +197
System.Web.Security.SqlMembershipProvider.GetPasswordWithFormat(String username, Boolean updateLastLoginActivityDate, Int32& status, String& password, Int32& passwordFormat, String& passwordSalt, Int32& failedPasswordAttemptCount, Int32& failedPasswordAnswerAttemptCount, Boolean& isApproved, DateTime& lastLoginDate, DateTime& lastActivityDate) +1121
System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved, String& salt, Int32& passwordFormat) +105
System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved) +42
System.Web.Security.SqlMembershipProvider.ValidateUser(String username, String password) +83
System.Web.UI.WebControls.Login.OnAuthenticate(AuthenticateEventArgs e) +160
System.Web.UI.WebControls.Login.AttemptLogin() +105
System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e) +99
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35
System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +115
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +163
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210
i also enabled the TCP/IP connection on my local machine to accept remote connections.. Can any1 please provide me a step to step guide on how to deploy the webiste?
Thanking u in advance.
Regards
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Apr 5, 2008
Hi ,
I have developed some report in Sql Server Reporting services my Page orientation is portrait that is report height and width are 8.5 and 11 respectively and margins are set to 0.3 in when it is printed the pages are printed more that actually viewed Pages.
I need help from someone.
Thanks,
Nikhil
response2nikhil@hotmail.com
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Sep 29, 2015
I have an SSRS 2012 table report with groups; each group is broken ie. one group for one page, and there are multiple groups in multiple pages.
'GroupName' column has multiple values - X,Y,Z,......
I need to group 'GroupName' with X,Y,Z,..... ie value X in page 1,value Y in page 2, value Z in page 3...
Now, I need to display another column (ABC) in this table report (outside the group column 'GroupName'); this outside column itself is another column header (not a group header) in the table (report) and it derives its name partly from the 'GroupName' values:
Example:
Value X for GroupName in page 1 will mean, in page 1, column Name of ABC column must be ABC-X Value Y for GroupName in page 2 will mean, in page 2, column Name of ABC column must be ABC-Y Value Z for GroupName in page 3 will mean, in page 3, column Name of
ABC column must be ABC-Z
ie the column name of ABC (Clm ABC) must be dynamic as per the GroupName values (X,Y,Z....)
Page1:
GroupName Clm ABC-X
X
Page2:
GroupName Clm ABC-Y
Y
Page3:
GroupName Clm ABC-Z
Z
I have been able to use First(ReportItems!GroupName.Value) in the Page Header to get GroupNames displayed in each page; I get X in page 1, Y in page 2, Z in page 3.....
However, when I use ReportItems (that refers to a group name) in the Report Body outside the group,
I get the following error:
Report item expressions can only refer to other report items within the same grouping scope or a containing grouping scope
I need to get the X, Y, Z ... in each page for the column ABC.
I have been able to use this - First(Fields!GroupName.Value); however, I get ABC-X, ABC-X, ABC-X in each of the pages for the ABC column, instead of ABC-X in page 1, ABC-Y in page 2, ABC-Z in page 3, ...
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Jun 16, 2008
I am having an asp.net web site hosted in my machine's IIS (5.1). This aspx files are accessing data from an sql server 2000 database located in another machine. While i am trying to open a connection from the aspx files to the database, an error showing login failed for that user. Not a trusted sql server connection. so i unchecked the "allow anonymous access" in the directory security. But now its working from my machine (the web server, localhost). but when i try to access the aspx files from another machine with my system ip, the same error exists-Login failed for the user and not a trusted sql server connection.
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Jul 3, 2007
I have designed a fairly simple report in report designer that uses an analysis services cube as its input, and a basic matrix object as the primary design component. Cube performance either via object browser in Analysis Services or via connection from Excel is great. It does exactly what you build a cube for, i.e. it builds aggregations you can get to quickly. However rendering from a report designer report within Report Manager is a different story.
Even though this report is being rendered from an execution snapshot, it is painfully slow at opening and closing different levels of drill down. The report does have six levels of drill down, which I am sure is a factor. If I use a smaller dataset, performance does become more acceptable. However, I don't consider the requirements of my report to be all that extraordinary.
My conclusion thus far is that larger data sets with many possible page renderings are not the best candidates for HTML rendered reports. In this case Microsoft's cube analysis add-in to Excel might be a better choice. Thoughts and feedback on either how to improve the rendering speed or other presentation alternatives that would perform better would all be welcome.
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Dec 28, 2006
Please add some more substantial needed info in ALL the web pages of "SQL Server 2005 Compact Edition RC1, Release Candidate 1", like at:
http://support.microsoft.com/kb/920700
for:
1) Clarifying the confusing name changes of the Mobile Edition to Everywhere Edition then to CE,
2) Giving installion instructions of the RC1 for mobile devices
Thanks,
Alpoge
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Feb 5, 2007
is there a step by step paper to get there? here is what i need to consider. I Iwill have many customers that will need their own set of records and access pages "branded for their company" each customer will have many clients. I am hosting this application on a windows 2003 server with SQL 2005 server enterprise.
I am using windows authentication, I have created a username in windows, then i added the windows user in SQL management studio in security, granted "DB Read" and "DB write" and again under the database security tab. still from the web authentication fails. i must be nissing a step or two?
I expect to set up a username for each database as i setup new customers.
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Mar 27, 2007
I want to make the ReportServer and Reports pages secured i.e not allow anyone to access these pages via browser.
I login to a machine as user ABC. This user does not have permission on reports.
if this user accesses ReportServer or Reports, expected is that access should be denied unless I enter
an account that has been given permissions.
for e.x. following pages should be secured.
http://<reportserver>/Reports
http://<reportserver>/Reports/Pages/Report.aspx?ItemPath=%2f<Report_Project>%2f<Report_Name>
http://<reportserver>/ReportServer
http://<reportserver>/ReportServer?%2f<Report_Project>&rs:Command=ListChildren
Actual result is that I am able to access these pages. When I click on the report I get the error (this is expected)
but then user ABC should be shown error on first page itself.
In short, for all the accounts that do not already have permissions on reports, the server should challenge me to enter an account and password.
Is there some setting in the configuration file?
Any help would be appreciated
Thanks in advance!
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May 10, 2015
I'm new to SQL. I have a scenario, Where customer want to move all the jobs from original SQL server to some remote SQL server and want to trigger jobs on remote server to do its work on original server.
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Sep 25, 2015
I want to schedule a job which pulls files from a non SQL server (Sybase) which later needs to have a step 2 kicking the ssis package. Problem is that, on the source a batch file will run every 4 hours and outputs total of 10 text files. (takes 5 minutes complete). Now, on destination i want to pull these files via SQL job but while scheduling;
1. I don't see any option saying like 4 hours 10 minutes or so
2. If its out there, then i believe this might be a problem as this time would be an increment one e.g next run would be 4 hours 20 minutes in that case.
How should i achieve pulling these files up because we have an SSIS package on destination that needs those text files to be used as soon as they arrive on SQL server(destination)
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Sep 30, 2005
I am trying to install SQL Server Sep 2005 CTP - ENTERPRISE, there are
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Oct 15, 2015
The SQL Server Agent (MSSQLSERVER) service on server started and then stopped. If i Manually start the services also SQL Server Agent services are stopping automatically.Though I selected Auto Restart SQL Server Agent if it stops unexpectedly, The services are stopping automatically.TCP/IP protocol was enabled for port 1433.Are there any setup I missed?
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Dec 3, 2007
I want to create a database on my local machine and work with it. But I am not able to see the name of my local server under "Database Engine" in the list of "Registered Servers".
Options I tried:
(1) In Registered Servers window, On Database Engine, I right clicked and in that selected "Update Local Server Registration"
(2) In Registered Servers window, On Database Engine, I right clicked and in that selected "New" -> Server Registration.
In "New Server Registration" Window, in "Server Name" drop down I clicked "Browse for more" but still in "Browse for Servers" window, I am not able to see the name of my local server in "Local Servers" tag under Database Engine.
(3) If I do File -> Connect Object Explorer -> Connect to Server window in "Server name" drop down box, if I click "Browse for more", I am able to see local server name eg. "XYZ" under Analysis Services, Reporting Services, and Integration Services but not under "Database Engine"
Please help me create a new database engine in SQL Server 2005 or list my local server under "Database engine" ?
Thanks
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