I'm attempting to move a view between DB2 and SQL Server.
CREATE VIEW msu.bad_bus_cnty_st_mstr
AS
SELECT id,
bus_cnty_cntry_cd,
bus_st,
bus_zip
FROM summit.mstr
WHERE ( bus_cnty_cntry_cd, bus_st ) IN (SELECT cnty_cntry_cd,
st
FROM uhelp.cnty_cntry_cd
WHERE
cnty_cntry_descr LIKE '%invalid%');
The view works in DB2, but doesn't work with SQL Server because of the WHERE clause. Can I have a recommendation on how to rewrite this view to work with SQL Server?
It usually helps to define what "doesn't work" means (e.g. what error did you get) and also to specify the version of SQL Server you are using.
Unfortunately SQL Server doesn't support IN() with more than one clause. However you can re-write your view this way:
ALTER VIEW msu.bad_bus_cnty_st_mstr
AS
SELECT id,
bus_cnty_cntry_cd,
bus_st,
bus_zip
FROM summit.mstr AS mstr
WHERE EXISTS
(
SELECT 1
FROM uhelp.cnty_cntry_cd
WHERE cnty_cntry_descr LIKE '%invalid%'
AND cnty_cntry_cd = mstr.bus_cnty_cntry_cd
AND st = mstr.bus_st
);
one way
CREATE VIEW msu.bad_bus_cnty_st_mstr
AS
SELECT id,
bus_cnty_cntry_cd,
bus_st,
bus_zip
FROM summit.mstr m
WHERE EXISTS( SELECT 1 FROM uhelp.cnty_cntry_cd c
WHERE c.cnty_cntry_descr LIKE '%invalid%'
AND c.bus_cnty_cntry_cd = m.bus_cnty_cntry_cd
AND c.st = m.bus_st)
Related
How to find recently created index details in my SQL Server database? Any query to find this?
In my database there are a lot of indexes. I want to know which of those indexes were recently created, with all their details.
You can use SCHEMA changes history to know index creation changes along with many changes
Below is how you do it..
1.Right click server
2.Goto reports -->standard reports-->Schema changes history
below is screenshot from mt device
Default trace is enabled by default,unless you turn it on
below query tells you,if default trace status is ON
select * from sys.configurations where name like '%trace%'
below query can provide object creation stats
SELECT OBJECT_NAME(objectid),objectname,indexid
FROM sys.fn_trace_gettable(CONVERT(VARCHAR(150), ( SELECT TOP 1
f.[value]
FROM sys.fn_trace_getinfo(NULL) f
WHERE f.property = 2
)), DEFAULT) T
JOIN sys.trace_events TE ON T.EventClass = TE.trace_event_id
where DatabaseName=db_name()
ORDER BY t.StartTime ;
Hey guys the code below is taking a really long time. I've been looking at it for quite a while. Is there anything that stands out as the obvious cause of delay?
[SQLSRV-3-JB] is a linked server BTW
Select count(cast (Unique_ID as bigint)) as [Count],
T.[Region_Code],
T.[Region_Name],
U.[Region_Code],
Y.[Examination_Year],
case when [Subject] = 'MUSIC THEORY' THEN 'Theory'
else 'Practical'
end
from [SQLSRV-3-JB].[X].[dbo].[Exam_and_Candidate_Details] Y
left join [SQLSRV-3-JB].[X].[dbo].[UK_Exam_Centre_Info] T
on Y.Centre_Code = T.Centre_Code
left join [SQLSRV-3-JB].[X].[dbo].[UK_Exam_Centres] U
on Y.Centre_Code = U.Centre_Code
where Y.[Examination_Year] between 2010 and 2016
group by Y.[Examination_Year],
T.[Region_Code],
T.[Region_Name],
U.[Region_Code],
case when [Subject] = 'MUSIC THEORY' THEN 'Theory'
else 'Practical'
end
Yes, there is one very obvious problem - the remote server. When you use a linked server like this, SQL Server has a disturbing habit of pulling all of the data in the remote tables to the local server before performing JOINs or filtration.
The correct way to handle this is to make this query a view on the remote server, and query the view with your WHERE clause on your end. So, your remote code would look like this:
-- Remote Server
USE X
GO
CREATE VIEW dbo.ExamCenterInfo
AS
Select count(cast (Unique_ID as bigint)) as [Count],
T.[Region_Code],
T.[Region_Name],
U.[Region_Code],
Y.[Examination_Year],
case when [Subject] = 'MUSIC THEORY' THEN 'Theory'
else 'Practical'
end
from dbo.[Exam_and_Candidate_Details] Y
left join dbo.[UK_Exam_Centre_Info] T
on Y.Centre_Code = T.Centre_Code
left join dbo.[UK_Exam_Centres] U
on Y.Centre_Code = U.Centre_Code
group by Y.[Examination_Year],
T.[Region_Code],
T.[Region_Name],
U.[Region_Code],
case when [Subject] = 'MUSIC THEORY' THEN 'Theory'
else 'Practical'
end
Then your local code:
-- Local Server
SELECT *
FROM [SQLSRV-3-JB].[X].[dbo].ExamCenterInfo ECI
where ECI.[Examination_Year] between 2010 and 2016
NOTE: There is some possibility that this will pull all of the view output before filtering by year. If this is still a problem, you will have to create a more complex mechanism to execute the view with filtration on the remote server.
using oracle 10 i have a link to sql server. I have a query (below) that runs fine as just as a select statment but when i use it to create a view (the view is created succsesfully but when i try to view the data in the view in sql developer) i get a
database 'linkname' does not support ROWIDs in this context
Is the issue the subselects where I am combining multiple rows in one table into multiple columns?
SELECT
upper(cus."cus_last_name") AS lname,
upper(cus."cus_first_name") AS fname,
upper(cus."cus_initial") AS minitial,
upper(cus."maiden_name") AS olname,
pt."cus_dob" AS dob,
pt."cus_id" AS id,
(
SELECT
cus_inst_key."cus_key_value"
FROM
"cus_inst_key"#linkname cus_inst_key
WHERE
cus_inst_key."cus_id" = cus."cus_id"
AND cus_inst_key."cus_key_cd" = 1
) AS CUSALTID,
(
SELECT
pcus_inst_key."cus_key_value"
FROM
"cus_inst_key"#linkname cus_inst_key
WHERE
cus_inst_key."cus_id" = cus."cus_id"
AND cus_inst_key."cus_key_cd" = 2
) AS CUSALTID2,
(
SELECT
cus_inst_key."cus_key_value"
FROM
"cus_inst_key"#linkname cus_inst_key
WHERE
cus_inst_key."cus_id" = cus."cus_id"
AND cus_inst_key."cus_key_cd" = 3
) AS CUSALTID3,
(
SELECT
cus_inst_key."cus_key_value"
FROM
"cus_inst_key"#linkname cus_inst_key
WHERE
cus_inst_key."cus_id" = cus."cus_id"
AND cus_inst_key."cus_key_cd" = 4
) AS CUSALTID4
FROM
"cus"#linkname cus;
thanks for any help.
the view actually is created ok i just can't use the data tab in sql developer for some reason.
EDIT: I think it's a problem on the subquery on the LINQ-generated query, it get all the records... But I don't know how could I fix it
I have made a simple ASP.NET MVC 2 application that does SELECT queries on a view, I get really poor performance, and while doing a simple benchmark with jMeter (10 conccurents connection) while disabling the cache (I don't want everything to rely on the non customizable/extreme OutputCache)
I see that the SQL Server get overloaded, consuming a LOT of CPU (up to 100%) and all its reserved memory space (512MB)
Here is the action code that cause the problems (manual transactions because it cause DeadLock with the other program that insert new data on the database) :
public ActionResult Index(int page = 0)
{
IronViperEntities db = new IronViperEntities();
db.Connection.Open();
DbTransaction transaction = db.Connection.BeginTransaction(IsolationLevel.ReadUncommitted);
var messages = (from globalView in db.GlobalViews orderby globalView.MessagePostDate descending select globalView).Skip(page*perPage).Take(perPage);
transaction.Commit();
db.Connection.Close();
ViewData["page"] = page;
ViewData["messages"] = messages;
return View();
}
Here is the query executed on the database :
SELECT TOP (100)
[Extent1].[MessageId] AS [MessageId],
[Extent1].[MessageUuid] AS [MessageUuid],
[Extent1].[MessageData] AS [MessageData],
[Extent1].[MessagePostDate] AS [MessagePostDate],
[Extent1].[ChannelName] AS [ChannelName],
[Extent1].[UserName] AS [UserName],
[Extent1].[UserUuid] AS [UserUuid],
[Extent1].[ChannelUuid] AS [ChannelUuid]
FROM ( SELECT [Extent1].[MessageId] AS [MessageId], [Extent1].[MessageUuid] AS [MessageUuid], [Extent1].[MessageData] AS [MessageData], [Extent1].[MessagePostDate] AS [MessagePostDate], [Extent1].[ChannelName] AS [ChannelName], [Extent1].[UserName] AS [UserName], [Extent1].[UserUuid] AS [UserUuid], [Extent1].[ChannelUuid] AS [ChannelUuid], row_number() OVER (ORDER BY [Extent1].[MessagePostDate] DESC) AS [row_number]
FROM (SELECT
[GlobalView].[MessageId] AS [MessageId],
[GlobalView].[MessageUuid] AS [MessageUuid],
[GlobalView].[MessageData] AS [MessageData],
[GlobalView].[MessagePostDate] AS [MessagePostDate],
[GlobalView].[ChannelName] AS [ChannelName],
[GlobalView].[UserName] AS [UserName],
[GlobalView].[UserUuid] AS [UserUuid],
[GlobalView].[ChannelUuid] AS [ChannelUuid]
FROM [dbo].[GlobalView] AS [GlobalView]) AS [Extent1]
) AS [Extent1]
WHERE [Extent1].[row_number] > 0
ORDER BY [Extent1].[MessagePostDate] DESC
View Code :
SELECT dbo.Messages.Id AS MessageId, dbo.Messages.Uuid AS MessageUuid, dbo.Messages.Data AS MessageData, dbo.Messages.PostDate AS MessagePostDate,
dbo.Channels.Name AS ChannelName, dbo.Users.Name AS UserName, dbo.Users.Uuid AS UserUuid, dbo.Channels.Uuid AS ChannelUuid
FROM dbo.Messages INNER JOIN
dbo.Users ON dbo.Messages.UserId = dbo.Users.Id INNER JOIN
dbo.Channels ON dbo.Messages.ChannelId = dbo.Channels.Id
I don't think the server hardware is a problem, I can run equivalent Rails/Grails application without any performance issue. (Dual Core, 3Gb of RAM)
A select count(*) on GlobalView returns ~270.000 lines, indexes are daily rebuilt and a explain show it uses all the clustered indexes.
I get an HTTP average response time of 8000ms, the SQL Server Management Studio shows an average CPU time for this SQL query of 866ms and an average logical IO of 7,592.03.
Database file size if ~180MB
I am using Windows Server 2008 R2 Enterprise Edition, ASP.NET MVC 2 with IIS 7.5 and SQL Server 2008 R2 Express Edition with Advanced Services. They are the only things running on this server.
What can I do ?
Thank you
I guess you got the query from SQL Server Profiler. Save the result, and pass it into the Database Engine Tuning Advisor. That might help you create additional indexes and statistics.
Just out of curiosity: wouldn't appending a .ToList() to the end of the var messages = ... line help?
I've found the probleme,
I replaced "orderby globalView.MessagePostDate descending" by "orderby globalView.MessageId descending", because there isn't any index on MessagePostDate, and that is muuuuch better !
Thank you
I have this sql:
UPDATE JOBMAKE SET WIP_STATUS='10sched1'
WHERE JBT_TYPE IN (SELECT JBT_TYPE FROM JOBVISIT WHERE JVST_ID = 21)
AND JOB_NUMBER IN (SELECT JOB_NUMBER FROM JOBVISIT WHERE JVST_ID = 21)
It works until I turn it into a parameterised query:
UPDATE JOBMAKE SET WIP_STATUS='10sched1'
WHERE JBT_TYPE IN (SELECT JBT_TYPE FROM JOBVISIT WHERE JVST_ID = #jvst_id)
AND JOB_NUMBER IN (SELECT JOB_NUMBER FROM JOBVISIT WHERE JVST_ID = #jvst_id)
Duplicated parameter names are not allowed. [ Parameter name = #jvst_id ]
I tried this (which i think would work in SQL SERVER 2005 - although I haven't tried it):
UPDATE JOBMAKE
SET WIP_STATUS='10sched1'
FROM JOBMAKE JM,JOBVISIT JV
WHERE JM.JOB_NUMBER = JV.JOB_NUMBER
AND JM.JBT_TYPE = JV.JBT_TYPE
AND JV.JVST_ID = 21
There was an error parsing the query. [ Token line number = 3,Token line offset = 1,Token in error = FROM ]
So, I can write dynamic sql instead of using parameters, or I can pass in 2 parameters with the same value, but does someone know how to do this a better way?
Colin
Your second attempt doesn't work because, based on the Books On-Line entry for UPDATE, SQL CE does't allow a FROM clause in an update statement.
I don't have SQL Compact Edition to test it on, but this might work:
UPDATE JOBMAKE
SET WIP_STATUS = '10sched1'
WHERE EXISTS (SELECT 1
FROM JOBVISIT AS JV
WHERE JV.JBT_TYPE = JOBMAKE.JBT_TYPE
AND JV.JOB_NUMBER = JOBMAKE.JOB_NUMBER
AND JV.JVST_ID = #jvst_id
)
It may be that you can alias JOBMAKE as JM to make the query slightly shorter.
EDIT
I'm not 100% sure of the limitations of SQL CE as they relate to the question raised in the comments (how to update a value in JOBMAKE using a value from JOBVISIT). Attempting to refer to the contents of the EXISTS clause in the outer query is unsupported in any SQL dialect I've come across, but there is another method you can try. This is untested but may work, since it looks like SQL CE supports correlated subqueries:
UPDATE JOBMAKE
SET WIP_STATUS = (SELECT JV.RES_CODE
FROM JOBVISIT AS JV
WHERE JV.JBT_TYPE = JOBMAKE.JBT_TYPE
AND JV.JOB_NUMBER = JOBMAKE.JOB_NUMBER
AND JV.JVST_ID = 20
)
There is a limitation, however. This query will fail if more than one row in JOBVISIT is retuned for each row in JOBMAKE.
If this doesn't work (or you cannot straightforwardly limit the inner query to a single row per outer row), it would be possible to carry out a row-by-row update using a cursor.