System Tables, Dynamic Management Views: Confused
Feb 4, 2008
As im diving into my new DBA role and reading as much as I can, I am a little confused on DMV's and system tables.
I've been reading through the book "SQL Server 2005 Bible", which has been very helpful. I tend to use it in conjunction with BOL whenever I come across something I want to learn more.
Last Friday, I tinkered around with DMV's, which was really cool, but I ran into something today that confused me.
Basically, it was finding out the recovery model for all the DB's on the server. The code in the book was:
SELECT [name], recovery_model_desc
FROM sys.databases;
Which turned exactly what it says it will.
however, I am confused.
I initially thought I needed to specify something in the "[name]" section, but realized, that is not the case.
My question is, why is that?
How do I know when to use [] around something?
I found this article:
http://www.databasejournal.com/features/mssql/article.php/3587906
I have been reading it.
I guess I am just really young and raw to T-SQL to know when to use the language corectly.
Is it due to the fact that the rules or syntax is a little different when using system tables?
Hope that makes sense.
Thanks.
TCG
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Aug 13, 2007
I have found that there is some very good information available inside of the dynamic management views related to Service Broker, however I have also found this to be problematic as by default only the dba's at my company had access to these views and it took me several days to get a login that could see them. Just a thought, but it would be nice if this data were available using a view that is more accessible.
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Mar 19, 2015
I have created a trigger on a table that get's too many updates so to analyze what records and what columns get updates I have coded a trigger that inserts into a table the record key and a flag on each column to let me know what is updates. Now that I am presenting the data to the developers I have been asked to provide the update / insert or delete statement
So on my trigger I have tried using dynamic management views but its returning the actual trigger code not the parent SQL Script that triggered it.
This is what I am using.
select@dDate as dDate, dest.[dbid], dest.[objectid], dest.[number], dest.[encrypted],
case when sder.[statement_start_offset] > 0 --the start of the active command is not at the beginning of the full command text
thencasesder.[statement_end_offset]
[Code] .....
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Mar 15, 2008
Please, could anyone tell me how to get information from which attribute of which table is the attribute from the view derived(it could also be a complex expression, not just attribute)through querying system tables or views(INFORMATION_SCHEMA, preferably if possible, because it's standard)
i'm using MSSQL2005.
Thank you!
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Sep 12, 2006
We are in the process of supporting two databases (Oracle 10g, SQL Server 2005) for our application.
I want to know what is the equivalent Tables/Views in SQL Server for the Oracle System tables dba_tab_comments, dba_tab_cols
Thanks in advance
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Dec 13, 2007
Hi and thanks for taking the time to read this. I get really confused really quickly when it comes to table linking, and I think I am doing it the hard way. I am going to show my stupidity and ask if there is a better way than what I do, because it takes a LOT of querying and seems like a huge waste.
In reality, I have about 20 tables to join like this, but I'm going to use three for the example:
"Main" Table
AcctNoNameHeightWeight
1Bob13
2Phil21
3Jim15
4Lisa22
"Height" Table
HeightIDHeightName
1Giant
2Tall
3Medium
4Short
"Weight" Table
WeightIDW_Name
1Skinny
2Normal
3Overweight
4Obese
What I have been doing is:
SELECT
Main.AcctNo,
Main.Name,
Height.HeightName,
Weight.WeightName
FROM
Main
INNER JOIN Height ON
Height.HeightID = Main.Height
INNER JOIN Weight ON
Weight.WeightID = Main.Weight
WHERE Main.AcctNo < 3
My question: is doing 20 INNER JOINS really the best way to do this with 20 tables, or is there some other way to link Main.Height to Height.HeightID that is less intensive?
Thanks again for reading, and in advance for any information or insight you can provide.
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Jan 30, 2008
Hello everyone. I need some assistance here. I have a web form to get information about user details. The web form has two parts. the first part is user personal information where there is few textboxes, dropdownlist , radiobuttons , checkbox etc. this is where user inputs his personal information. the second part contains the office information where there is few textboxes, dropdownlist , radiobuttons , checkbox etc too. but the second part is automatically populated by data from the database(lets say table1). this happens as soon as user selects an option from dropdownlist in second part(here an option for dropdownlist is name of the office) . there is also a save and cancel button at the end of the form.now what i want here is, whenever i click a save button in my webform,i want the data of first part of my webform (ie user personal information) to get stored in new table(say table2).but i dont want the data of secont part of my webform(ie office information) to get stored in table2.(coz its already stored in table1.thats from whereit got populated earlier).But i want a reference of second part of my web form(ie office info) in table2.(only the reference id of related data from table1.not the whole data)and finally i want to display data from both the tables in one single details view.(both personal and office information)i hope u people are gettin it?i know i have to use foriegn keys.but i dont know how to use in this case.(sql express)and can u plz explain how to implement this in cs file with example including source code.(c#, vwd2005 express, sql express). thanks. jack.
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Apr 10, 2007
I was looking in sys.syslogins and sys.sql_logins for a property to tell me if the login is locked but all i see are properties for if the account is enabled or if the account has access.
Is there a system view I can query to tell if if the account is locked ?
Thanks,
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Sep 14, 2007
Hi, I have a question about nested views. Is there a way for the view not to place any locks on the underlying tables? I tried to re-write my views and its nested views with "with (nolock)" but when I view the enterprise manager, I still see exclusive and share lock on the tables. Any help would be appreciated. Thanks.
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Jan 31, 2006
Hello,
can someone tell me where I can look to find a sql command that
is being executed by an application against my database?
In Oracle, I look in the v$sql_text view - is there something
similar in SQL Server 2000 ?
Many thanks in advance
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Nov 26, 2007
I'm trying to access a System Catalog View (sys.database_permissions, and others) from a table valued function. I need to be able to pass the database name into the function so that I can operate on any database. Typically I'd use dynamic SQL to do something like
INSERT INTO #tempTable
EXEC ('SELECT * FROM ' + @DBName + '.sys.database_permissions')
But of course I can't use dynamic SQL inside of a UDF. I know I could do this using a stored procedure, but I'd need the output to be a recordset that I can query.
Has anyone done anything like this? I think I'm stuck.
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Jul 20, 2005
Hi,I have a few things on my databases which seem to be neither true systemobjects or user objects - notably a table called 'dtproperties' (createdby Enterprise manager as I understand, relating to relationship graphingor something) and some stored procs begining with "dt_" (some kind ofsource control stuff, possible visual studio related). These show up whenI use"exec sp_help 'databaseName'"but not in Ent. Mgr. or in Query Analyzer's object browser, and also notin a third party tool I use called AdeptSQL. I am wondering how thosetools know to differentiate between these types of quasi-system objects,and my real user data. (This is for the purpose of a customized schemagenerator I am writing). I'd prefer to determine this info with systemstored procs (ie sp_help, sp_helptex, sp_...etc) but will dip into thesystem tables if needed.Thanks,Dave
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Jun 4, 2008
Hi all, Is there any easy way to not allow a user to see system views? I have set up 1 view for a login, and I have to use an ODBC connection to access it. However, the 3rd party application I'm using is apparently timing out because of the number of tables/views that are returned. TIA! - Mark
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Mar 5, 2006
I've had a couple problems with SMO and I wonder if anyone else has. Specifically, when I run through stored procedures (just like your example) it is painfully slow. Maybe 5 a second. Another problem is filtering on nonsystem objects with either "SVR.SetDefaultInitFields(typeof(Microsoft.SqlServer.Management.Smo.View), "IsSystemObject"); or View.isSystemObject.
Both cases crash my app. Any ideas?
Below are two ways that both crash or hang.
SVR.SetDefaultInitFields(typeof(Microsoft.SqlServer.Management.Smo.View), "IsSystemObject");
foreach (Microsoft.SqlServer.Management.Smo.View view in viewCollection)
{}
OR
foreach (Microsoft.SqlServer.Management.Smo.View view in viewCollection)
{
if (!view.IsSystemObject)
{}
}
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Apr 30, 2007
Is there anyway to access system views on/from a linked server?
I have unsuccessfully tried various permutations of
select *
from [MDEDATAWTDss2005].master.[information_schema.colums]
Thanks
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May 11, 2015
I got a script, which ran on SQL Server 7. After compiling on SQL Server 2012, I came across that the previous script used a system ViewsTables columns named "suid", which no longer operate in SQL Server 2012. After modifying the script with 2012 and replaced suid by SID, it works but the suid column is not appearing in System Views. What if we want to get that column back in SQL Server 2012? is there any possible way?
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Sep 21, 2006
All of a sudden none of our merge replications are working. In fact you can't even insert, update or delete and data from the tables in the merge publication. When trying that, we get an error stating:
Msg 550, Level 16, State 1, Procedure MSmerge_ins_E3F43EF8B259476099BBB194A2E1708C, Line 42
The attempted insert or update failed because the target view either specifies WITH CHECK OPTION or spans a view that specifies WITH CHECK OPTION and one or more rows resulting from the operation did not qualify under the CHECK OPTION constraint.
The statement has been terminated.
Currently, the only solution I've found is to delete the publication and recreate it. I'm trying to figure out why this happened. It happened on a development server that to my knowledge, hasn't been changed in a week or so outside of changing the server's IP address. Would that cause such an error to occur?
-mike
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Oct 8, 2007
I'm recreating many of my DBA scripts that no longer work in 2005 due to the rework of system tables. It's a risk I lived with knowing that someday the system tables would change. I'm now encountering collation problems, which I do not understand. I know how to fix the problem, but I don't know why the collation issues exist in the first place.
Run the following command.
Select * From sys.all_objects a JOIN master..spt_values b on a.type = b.type
You will receive the following error.
Msg 468, Level 16, State 9, Line 1
Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Latin1_General_CI_AS_KS_WS" in the equal to operation.
Now run sp_help 'sys.all_objects' and look at the collation defintion for columns "type" and "type_desc". In my environment they have a collation of Latin1_General_CI_AS_KS_WS. This is different then the overall default collation of SQL_Latin1_General_CP1_CI_AS, thus causing the error.
My question is why did Microsoft need to make this collation different for these columns?
Any ideas?
Thanks, Dave
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Nov 6, 2007
I am trying to access WMI from a function. I take it that system.management is not available. Do I have any other options?
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Apr 25, 2008
Is this possible?
here is the situation. I have a DB on one system. I back it up and then restore it to a second system. This second system I run reports off of and I want to create custom views that do not exist on the original system. Can I restore the
backup DB from the remote system without wiping out the custom views on the local system?
I have to do this this way as they won't let us create the views we want on the remote system so the only way we have access to run the reports is by restoring the backup locally.
TIA!
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Oct 19, 2006
what is the best firewall protection for network computer?
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Mar 7, 2008
hello all,
mates i have in my care around 10 applications. each application has it's own database and in each database i have a users table. in these tables i am also having columns for users rights for the applications.
since the users are the same for all 10 applications i am beginning to feel that it's time for a change. i am trying to develop a single database for users but i did not find an appropriate solution for the users rights management. i am afraid that if i put together too many columns in a single table it will decrease performance.
do you know any pattern / article / book for a users management system?
thanks in advance,
homedream
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Jan 12, 2007
Hello folks!I'm have some trouble with a dynamic update system! What I want to do: 1. I want to send in the code behind from any .aspx file values and parameters to a .vb class2. Code (code behind in .aspx file):1 gridupdate.updategrid("tblFeedbackA", e.CommandArgument, "locked=@locked", "@locked", "int", "0") 'Call de .vb class2 getgridfeedback()
3. Code (code in .vb class)1 Public Shared Function updategrid(ByVal tblnaam As String, ByVal x As Integer, ByVal sql As String, ByVal parameters As String, ByVal sqltype As String, ByVal waarden As String 'translation: values)
2 Dim dynstr As String()
3 Dim dynstr2 As String()
4 Dim re As New Regex(",")
5 dynstr = re.Split(parameters)
6 Dim i As Integer
7 dynstr2 = re.Split(sqltype)
8 Dim dynstr3 As String()
9 dynstr3 = re.Split(waarden)
10
11 Dim sqlconn As New SqlConnection(ConfigurationManager.ConnectionStrings("DataBase").ConnectionString)
12 Dim sql2 As String = "UPDATE " & HttpContext.Current.Session("prefix").ToString & tblnaam & " set " & sql & " where id=" & x
13 Dim sqlcmd As New SqlCommand(sql2, sqlconn)
14 sqlconn.Open()
15
16 For i = 0 To dynstr.Length - 1
17 sqlcmd.Parameters.Add(dynstr(i), CType("sqldbtype." & dynstr2(i), System.Data.SqlDbType))
18 sqlcmd.Parameters(dynstr(i)).Value = dynstr3(i)
19 Next
20 sqlcmd.ExecuteNonQuery()
21 sqlconn.Close()
22 Return Nothing
23 End FunctionAll I want to do is to add the sqlparameters dynamically, but I don't find a way to do this :).Can you help me out?Thanks!
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Mar 18, 2007
How can Iget database structure of Document management system ?????
please help me..........
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Nov 13, 2007
Hi ,
i hav a problm ,How can i see sql sever reports in RMS,(Retail managmt System),How can we add these reports on that?
Thanks in advance..
Jo
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Oct 5, 2007
Firstly I consider myself quite an experienced SQL Server user, andamnow using SQL Server 2005 Express for the main backend of mysoftware.My problem is thus: The boss needs to run reports; I have designedthese reports as SQL procedures, to be executed through an ASPapplication. Basic, and even medium sized (10,000+ records) reportingrun at an acceptable speed, but for anything larger, IIS timeouts andquery timeouts often cause problems.I subsequently came up with the idea that I could reduce processingtimes by up to two-thirds by writing information from eachcalculationstage to a number of tables as the reporting procedure runs..ie. stage 1, write to table xxx1,stage 2 reads table xxx1 and writes to table xxx2,stage 3 reads table xxx2 and writes to table xxx3,etc, etc, etcprocedure read final table, and outputs information.This works wonderfully, EXCEPT that two people can't run the samereport at the same time, because as one procedure creates and writesto table xxx2, the other procedure tries to drop the table, or read atable that has already been dropped....Does anyone have any suggestions about how to get around thisproblem?I have thought about generating the table names dynamically using'sp_execute', but the statement I need to run is far too long(apparently there is a maximum length you can pass to it), and evenbreaking it down into sub-procedures is soooooooooooooooo timeconsuming and inefficient having to format statements as strings(replacing quotes and so on)How can I use multiple tables, or indeed process HUGE procedures,withdynamic table names, or temporary tables?All answers/suggestions/questions gratefully received.Thanks
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Oct 16, 2007
I am an SQL beginner / intermediate.
My question is assuming everything is equal is a view of a 4 table join slower than the SQL query of the 4 table join when running reports?
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Jun 29, 2001
My client has a three tier system.
and they are using only views to assess the database and doing about 5 joints what are the advantages and disavantages of using only view vs hiting the table dirrectly
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Aug 24, 2000
Are views used for securiry reasons, such as restricting access to certain columns/rows or is there performance advantages to using views. There is disagreement in my dept.
I created the following view PAYACTIVE:
Select * FROM PAYMENTS WHERE STATUS = 'ACTIVE'
The PAYACTIVE view contains 260 rows. The PAYMENTS table contains over 2 million rows. I executed the following commands:
Select * FROM PAYACTIVE
Select * FROM PAYMENTS WHERE STATUS = 'ACTIVE'
They seem to take the exact same amount of time. In other words, selecting from the view seemed to not help performance. Am I conducting a valid test?
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Jun 29, 2001
My client has a three tier system.
and they are using only views to assess the database and doing about 5 joints what are the advantages and disavantages of using only view vs hiting the table dirrectly>
Emily
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Aug 30, 2005
I have a SQL script that I attempted to write into a view. If I run the script in SQL Query Analyzer it works perfectly. When I attempt to run execute as a view I receive the following error message: "[MS][ODBC SQL Server Driver][SQL Server] The query and the views or function in it exceeded the limit of 256 tables."
My objective is to use the recordset from the view to create a crystal report but have been unable to replicate the "query" effect directly in crystal. (unfortunately I am also a new crystal user)
All my searches have been fruitless. I remember seeing something about SQL Server 2000 supporting 1000 tables and older versions supporting 256 in an Access forum but have not been able to find that thread a second time.
Any provided solution would be greatly appreciated. (I am getting tired of hearing the "gears" in my head grinding. Is smoke from the ears normal?)
SELECT SubID, SubMenuDesc, ItemID, ItemDesc, 0 AS ModID, 'n/a' AS ModDesc, round(ItemPrice/100,2) as ItemPrice
FROM vwSubMenuNorm
WHERE (ItemPrice <> 0)
UNION
SELECT vwSubMenuNorm.SubID, vwSubMenuNorm.SubMenuDesc, vwSubMenuNorm.ItemID, vwSubMenuNorm.ItemDesc, vwModifiersNorm.ItemID AS ModID,
vwModifiersNorm.ItemDesc AS ModDesc, round(vwModifiersNorm.ItemPrice/100,2) as ItemPrice
FROM vwSubMenuNorm INNER JOIN
vwItemNorm ON vwSubMenuNorm.ItemID = vwItemNorm.ID INNER JOIN
vwModifiersNorm ON vwItemNorm.MOD1 = vwModifiersNorm.ModID
WHERE (vwSubMenuNorm.ItemPrice = 0) AND (vwModifiersNorm.ItemPrice <> 0)
UNION
SELECT vwSubMenuNorm.SubID, vwSubMenuNorm.SubMenuDesc, vwSubMenuNorm.ItemID, vwSubMenuNorm.ItemDesc, vwModifiersNorm.ItemID AS ModID,
vwModifiersNorm.ItemDesc AS ModDesc, ROUND((vwSubMenuNorm.ItemPrice + vwModifiersNorm.ItemPrice)/100, 2) AS ItemPrice
FROM vwSubMenuNorm INNER JOIN
vwItemNorm ON vwSubMenuNorm.ItemID = vwItemNorm.ID INNER JOIN
vwModifiersNorm ON vwItemNorm.MOD1 = vwModifiersNorm.ModID
WHERE (vwSubMenuNorm.ItemPrice <> 0) AND (vwModifiersNorm.ItemPrice <> 0)
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Aug 12, 2005
I am using a Microsoft Access ADP to get to data on SQL Server 2000. I would like to protect the base tables from being edited directly, but allow the views and SPs to handle all the work of getting data in and out. From what I have read in numerous articles and boods, I should be able to grant permissions just on the Views and NOT on the tables. However, the ONLY way I can make my views 'updatable' is by graniting UPDATE permissions on the TABLE! Worse yet, if I DENY permissions to UPDATE, INSERT, and DELETE in the view, but allow them in the table, the view allows the updates anyway, apparently not looking at the fact that it should be DENIED.
:confused:
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Jun 9, 2004
I want to allow a group of users to create views but not be able to create new tables or stored procedures... how can I do this ??
Thanks, John :eek:
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