Why Clean Data Pages Written To L2 Cache To Make Space For Other Not Modified Pages
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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May 31, 2007
Is there a way to drop clean buffers at the database level instead of the server/instance level like the undocumented €śDBCC FLUSHPROCINDB (@dbid)€??
Is there a workaround for €śdbo€? to be able to flush procedure and data cache without being elevated to €śsysadmin€? server role?
PS: I am aware of the sp_recompile option that can be used to invalidate cached execution plans.
Thx.
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Jul 20, 2005
I am trying to understand how the data in sql server is stored andalso regarding fill factor and page splitting.1) My first question what is the difference between Index pages andData pages.and how are they different for clustered and non clustered indexes andheap tables.2) What is the relation between index and data pages.2) BOL says that fill factor is used to define the amount of freespace on each page of index. I am confused here what does index pagesand data pages containfor clustered/non clustered/heap tables.3) Why does page splits occur and do they occur due to the lack ofspace in index or data pages?Thanksskura
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Jul 23, 2005
Hello all,SQL 2000 on Windows 2000. If I go into all tasks, maintenance plan, itgives me an option to reorganize data and index pages. When I check onit, it populates the line "change free space per page percentage to" andputs in 10 in there. Is this the default for free space? Is it thedata pages that will have 10% free space or just the index pages? Aredata and index on the same pages?Thanks,Raziq.*** Sent via Developersdex http://www.developersdex.com ***
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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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Sep 15, 2014
I in a table or partition, the first page is an IAM-Page if I'm not wrong, this page keeps track of the extents.
In the first extent to where the "first_iam_page" points to, the extent is a mixed extent, therefore the pages can be from different tables or partitions, correct? How does my IAM-Page map the right pages to the corresponding table? the following extents are all uniform of one table type, so I guess it doesnt matter then. But n, how does it keep track of which pages belong to which tables in the first extent?
My second question is, the first IAM-Page is obviously an IAM-Page, but there are also GAM , SGAM and PFS Page files... where are they stored? Because when I create a table and insert a big value(8000) into it, it reserves 16KB for that table, one for the IAM-page, and one for the first data-page. But where can I find the GAM,SGAM and PFS page files? or are they not page files, just some other structures?
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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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May 10, 2007
I have a question about loading data on the page lode event. The question is more conceptual then how to.
Using C#, I would like to make a call to a SQL 2000 Server, with the use of a stored procedure return one row with eleven fields. Then use the data to fill five different controls. There is no manipulation of the data it is just presented as information. With a DataReader and the GetValues method using the resultant array I can fill the controls (or can I), or with a DataSet and the Load method do the same thing. Now this code can be placed in the code behind page or it can be implemented in a class. This is the only page that uses this combination of fields and controls; however I would think a more generic call to the data could be made then pick and chose the fields as needed. What process makes the most sense? Is what I just described even possible (as yet I haven’t tried it)?
As always thanks in advance for any thoughts, comments, and suggestions.
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Mar 2, 2007
IF (SELECT OBJECT_ID('t1')) IS NOT NULLDROP TABLE t1GOCREATE TABLE t1 (c1 INT, c2 INT)DECLARE @n INTSET @n = 1WHILE @n <= 454BEGININSERT INTO t1 VALUES (@n, @n)SET @n = @n + 1ENDSELECT name, indid, CASE indidWHEN 0 THEN 'Table'WHEN 1 THEN 'Clustered Index'ELSE 'Nonclustered Index'END AS Type,dpages, rowcntFROM sysindexesWHERE id = OBJECT_ID('T1')name indid Type dpages rowcnt---- ----- ---- ------ ------NULL 0 Table 2 454I have a table containing 454 rows of two columnsof type INT with each being 4 bytesc1 int = 4 bytes+c2 int = 4 bytes=8 bytes per rowIf I entered 454 rows : 454 * 8 = 3,632 byteseach SQL Page is 8KB = 8 * 1024 bytes= 8,192 bytesa data page header takes the first 96 bytesleaving 8096 bytes for data and row offsets.Each record uses a row offset at the end of the pageconsisting of 2 bytes. 454 * 2 = 908 bytes.8096 - 3632 - 908 = 3,556 bytes. Should this befree data bytes?For a heap table, does SQL add an internal uniqueidentifiercolumn also? or my question is when does SQL adda uniqueidentifier? I am reading Inside SQL 2000 andtrying to understand a few things.A uniqueidentifier of 4 bytes gets added when a clustered indexexists but it is NOT a UNIQUE clustered index. AND onlyif duplicate record is added those two records only geta uniqueidentifier value.But in my example it's a heap table with no indexes. Evenon a heap table with no indexes a ROWID or Uniqueidentifierget added? Based on the INSERT statement above allvalues are unique.So what am I missing to understand why 453 rowsmake one data page to be used whereas 454 rowsmake two data pages to be used?Thank you
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May 16, 2007
Hi,
My problem is that I cannot completely clean buffer cache on SQL Server 2005 version 9.00.2047.00 (probably SP1).
Right after I run DBCC DROPCLEANBUFFERS in the context of my database (this is development server, and so far I am only the one who is working with a particular database), I run a script that quetries sys.dm_os_buffer_descriptors view also from the context of my database to make sure that the buffer cache is really clean. However it shows large number of entries totalling 42 MB.
I ran both DBCC an the script in the past too, and it always showed nothing in the results, that means that buffers were really clean. The reason why I am running this is for benchmarking of existing and new application.
Does anybody have any idea, suggestions, how to troubleshoot this issue ? I already closed all connections to this database, but rebooting the server is not an option since other people are also working on it.
Thanks
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Aug 18, 2015
What is the difference between CleanExpiredCache and FlushReportFromCache Do we need to run both the SPs to clear all the SSRS reporting cache? Is it possible to clean all the Cache information and retain the logs? If yes how we can do so. Is it by deleting the REportServerTempDB.dbo.ExecutionCache table work in achieving this?
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May 31, 2007
hi,
we have migrated from win 2000 to win 2003. now web site which has database connection with sql server 2000 ( running on same win2003 server ) , is running very slow. pl help as soon as possible.
thanks
archana
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Jul 20, 2006
Hi All,
How to estimate the number of pages there should be in the index? Thanks.
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Jun 19, 2007
Hello, everyone:
How to calculate or estimate the pages or a table? I always heard someone said their databases have many pages increase one day. What does it mean?
Thanks
ZYT
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Mar 15, 2004
people, can anybody tell me some good links,
mssql good links, where are bols,
some months ago i used web page like %mssqlteam%
but now i cant to find this web page,
thanks !
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Apr 19, 2007
Hello all,
I have developed a report that when displayed in page layout view is giving me blank pages with only heaer & footer information even though none of my groups have page breaks designated. This also occurs when exported to PDF.
Can anyone provide some information on why this is occurring and how to remedy it ?
Thanks.
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Mar 6, 2008
How to reduce Readahead Pages/Sec?
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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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Jun 27, 2006
Hi everyone,
I have a simple question about Rows in Pages for you.
In my opinion, rows are the storage of the data in databases.
I would like to ask that there are any important properties of Rows which I am not aware.
Thanks
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Apr 26, 2006
Hi all,
I have a report with a few subreports and after each subreport I've added a page-break. But I want to skip a page and to leave it blank if the previous subreport ends at an odd page, so the next subreport will start at the next odd page instead of the even page.
I use a transparent rectangle to add page breaks after each subreport, but because I don't have access to the Global.PageNumber variable in the body section of the report, I don't know when the page is even, so a second rectangle with a custom expression for the Visibility property is unuseful.
Does anyone know how to fix this issue?
Thank you and I look forward to seeing some suggestions.
Radu.
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Apr 1, 2008
when I open report on report service it consist two pages, it's correct
but if I export report to pdf file I get two additional blank pages
it looks like - first correct page with data - blank page with header - second correct page with data -blank page with header
why I get two blank pages with data ?
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Dec 27, 2007
I have created several tables in a single layout. How can I put each table in different page?
Thanks
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Jan 12, 2007
Hello :
I have a report with several pages, I want poster the same element in all pages, it is what the solution or the property for that?
Thank you very much.
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Aug 25, 2006
I have been looking everywhere and cant seem to find out how to do this using 2.0I would like to have my connection strign in my web.config file being decralred publicly in my pages so that I dont have to repeat lines of code throughout pages.In my web.config I have this.<connectionStrings> <add name="myconn" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ASPNETDB.MDF;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" /> </connectionStrings>then in my pages I haveImports System.DataImports System.Data.SqlClientPublic sqlconnection As New SqlConnection(ConfigurationSettings.AppSettings("myconn"))Public sqlcommand As New SqlCommandPublic sqldataAdapter As New SqlDataAdapterPublic sSQL as StringFunction getdata()sSQL = "INSERT INTO tbl_Idea (Status) value (@Status)Dim dbcommand As New System.Data.SqlClient.SqlCommand(sSQL, sqlconnection)Dim statusparam As New SqlParameter("@Status", SqlDbType.NVarChar)statusparam.Value = "PENDING"dbcommand.Parameters.Add(statusparam)sqlconnection.Open()dbcommand.ExecuteNonQuery()sqlconnection.Close()for some reason this code does not seem to work. It keeps telling me The ConnectionString Property has not been initialized.I do the same thing in my asp.net 1.1 pages using vs 2003. Can some one help or atleast point in the right direction.thanks
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Jun 9, 2007
Is there possibility to make backup of MS SQL database directly from ASP.NET pages?
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Jun 3, 2008
Hello,
Iam a new developer to asp.net, I have been trying to connect a database to a asp.net page but many times i failed. actually i dont want to connect just directly by dragging and dropping controls rather i wanted to bind controls like textboxes and comboboxes but at first i think i have to make querystrings to and sqlconnection to connect to the database. I mean i have to manually code all these items to get my pages connected. but most of the time i face the bug which is:
Server Error in '/WebSite2' Application.
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)
is that because of the fact that i dont sql server management studio installed actually i tried the same process with some other pcs that does not have sql server insatlled but it was working pretty well, but now i dont have a sql server installed and the problem still insists.
hope i have clarified my problem, sorry if it is a bit lenghty
thanks and regards
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Dec 11, 2005
I can some on tell why I can or I cannot run a 40000 Pages /day with SQL Express.
Thanks
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May 11, 2000
Hello,
Has anyone come up with an easy way to change the code page sort order in the master database. Unfortunately, I inherited two machines running different codes and neither one is ANSI standard. I would like to get them both back to ANSI. Each one contains approximately 15 custom databases.
Any suggestions except prayer would be much appreciated.
Thanks,
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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 15, 2002
Does anyone have any experience detecting and repairing torn pages? Does Optimization repair Torn Pages ? Any help or resources would be much appriciated.
Late
Matt
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Dec 2, 1998
Hello,
I have two identical databases DB1 and DB2. And each have 4 tables
In DB1 i will insert the data in the following order
For Every set of 4 records
Insert into Table1 Values ..
Insert into Table2 Values ..
Insert into Table3 Values ..
Insert into Table4 Values ..
In DB2, i will insert the data as
Insert into Db2..table1 select * from db1..table1
Insert into Db2..table2 select * from db1..table2
Insert into Db2..table3 select * from db1..table3
Insert into Db2..table4 select * from db1..table4
i.e. a bulk copy.
What is hapening is if i run DBCC SHOWCONTIG on both the database tables, it shows avg Space used for DB2 tables as more than 90% but for DB1 it is 4 - 5 %.
And if we check the device stace used by db1, it will be 10 times more by the DB2 for the same set of data. Both databases have different devices to store the log.
1. Can we have any command/procedure to reasllocate all the data so that minimum pages are used to store the data.
2. One more thing, is there any diff in SQL server 6.5 installed on Dell6100 ( Pentium Microprocessor ) and winNT 4.0 ? Because what is hapening is, if the log space is full, and if we Stop and start the SQL server on Dell system, it is not at all clearing the log space occupied. But in NT it is clearing the LOG.
3. Does any SQL server service Packs affect this..? If any let me know
4. If we create saperate LOG devices, what othere information is stored in the Data devices othere that data. Because in my case, DB1 is occupying more space than the actual data inserted.
ThanX
__Vijay VM
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Apr 11, 2008
Hello everybody
I've built a few reports using Reporting Services. The number of pages in my reports isdifferent in the on-screen rendered report from the printed version.
My report properties are set to an A4 page (210 x 297) and also Globals.Page give me a different result. (on the screen I see 2 pages and I print 6 pages).
How can I solve this problem?
Best regards
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Mar 20, 2008
Hi,
I've created a simple .rdl report and seems to show the preview under my visual studio. But, when I add the .rdl file into the server and export them to be a .PDF, The pdf is created with two blank pages for every single page with data.
Please comment me to fix this.
Thanks.
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