Tabel Scan
Oct 29, 2007Hi All,
When an end user view a report using report manager or a custom build web site, would query of the report scan the tables in original data base? In this case it is a OLTP data base.
Thanks
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What Is The Difference Between Clustered Index Scan And Table Scan
Jan 29, 2006How can I improve performance of my search if I am looking in a table with more than ten million rows with a "like query"?
Does putting an index mean only telling the computer to start in a particular order?
if I index all the coloums does my search get faster ?
how can I decide on an indexing strategy?
Index Seek, Index Scan, Table Scan
Oct 4, 2007
Hey,
what is the difference between Table Scan und Index Scan?
I find no difitions in the internet
Finchen
What Is Table Scan, Index Scan And Index Seek??
Sep 21, 2007Hi,
I want to know wht is a
TABLE SCAN
INDEX SCAN
INDEX SEEKand When they are used, Wht is the difference between all these.????
IF NOT EXISTS (... - EXISTS TABLE : Nested Iteration. Table Scan.Forward Scan.
Sep 20, 2006Hi,
This is on Sybase but I'm guessing that the same situation would happen on SQL Server. (Please confirm if you know).
I'm looking at these new databases and I'm seeing code similar to this all over the place:
if not exists (select 1 from dbo.t1 where f1 = @p1)
begin
select @errno = @errno | 1
end
There's a unique clustered in dex on t1.f1.
The execution plan shows this for this statement:
FROM TABLE
dbo.t1
EXISTS TABLE : nested iteration.
Table Scan.
Forward scan.
Positioning at start of table.
It's not using my index!!!!!
It seems to be the case with EXISTS statements. Can anybody confirm?
I also hinted to use the index but it still didn't use it.
If the existence check really doesn't use the index, what's a good code alternative to this check?
I did this and it's working great but I wonder if there's a better alternative. I don't really like doing the SET ROWCOUNT 1 and then SET ROWCOUNT 0 thing. SELECT TOP 1 won't work on Sybase, :-(.
SET ROWCOUNT 1
SELECT @cnt = (SELECT 1 FROM dbo.t1 (index ix01)
WHERE f1 = @p1
)
SET ROWCOUNT 0
Appreciate your help.
Create Tabel Sc
Oct 24, 2005How can I get the script of a table.i.e 'CREATE TABLE' script.
1. One way is to get this script from SQL Analyzer.
but I m having tables created in the database and I want the My Stored Procedure should build the script and return it to me ...
How could I achieve that ?
Thankx in advance... :)
After Linking A Tabel To SQL
Nov 16, 2006I link to a sql server for the first time.
I change my .provider and .connectionstring to ADO
And know in one of my forms i get a debug Error; Invalid table Name "tablename"
can someone help me with this.
Thanks eddied
Print The Design Of A Tabel
Nov 25, 2005Hi,
I cannot figure out how to print the design of a tabel.
What I need is to have printed on a paper the list of the columns, data type, length, allow nulls and description for a table.
thx
Waarde Uit Tabel Incompleet
Nov 24, 2006Ik wil uit een tabel het gehele getal halen, de waarde staat als05612123 maar wanneer ik ditopvraag in bv. de Query Analyzer wordt de waarde gegeven als 5612123.De 0 welke ervoor staat wordtdus niet afgebeeld. De tabel in de kolom heeft als Data Type char, deLength staat op 10 en Allow Nulls staat aangevinkt. Wie kan mij helpen?Dank.
View 3 Replies View RelatedInsert From One Tabel Into 2 Tables
May 20, 2008
Hi, i need to create a stored procedure that will take data from one table and insert it into one tabe.
I have 3 tables
tblTest is the table that i need to take the informations from.
intD1 to intD4 is a score
I don't know if iexplain my sefl correctly tks in advance!
tblTest
1 , 2 , 'A', 'B', 0 , 1 ,2 , 4
I need this
tblResultat
1, 2, 'A','B'
tblResultatXReponse
1,1,0,0
2,1,1,1
3,1,2,2
4,1,4,3
tblTest
intTestId autonumber
intCoursId
strCodeAbsent1
strCodeAbsent2
intD1
intD2
intD3
intD4
tblResultat
intResultatsId autonumber
intCoursId
strCodeAbsent1
strCodeAbsent2
tblResultatXReponse
intResultatXReponseId autonumber
intResultatsId
intReponseDesc
intOrdre
Stored Proc Insert W/look Up Of Value From Other Tabel?
Aug 3, 2004Hi, I'm fairly new to strored procedures. what I need to do is create a new row with an INSERT specifying value A as a param ( so far no problem ) and value B as a value from table2. Is this possible?
Thanks for your help
Raif
Making An Leauge Series Tabel.
Sep 19, 2007Hi
Running on SQL Server2005
I have an tabel Match, TeamInGroup, Team, Group and Series.
Want following resutlt:
Tabell
Lag S V O F TOTAL P
Grupp A
BK Örnen 2 2 0 0 30-10 4
Wåxnäs BC 3 2 0 1 35-25 4
BK Kaskad 2 1 0 1 20-20 2
BK Bågen 3 1 0 2 29-31 2
BK Glam 3 1 0 2 24-36 2
IFK Norrköping BF 3 1 0 2 22-38 2
Grupp B
Uppsala BC 90 3 2 1 0 35-25 5
Ludvika BK 2 2 0 0 25-14 4
Sundbybergs IK F 3 1 1 1 34-26 3
LBK Hudik 3 1 0 2 23-36 2
Domnarvets BS 2 0 1 1 19-21 1
Örta IF 3 0 1 2 23-37 1
Grupp C
Stureby BK 3 2 0 1 39-21 4
Tureberg IF 2 2 0 0 28-12 4
BK Stallis 3 2 0 1 28-31 4
BK Amiki 3 1 0 2 28-31 2
Djurgårdens IF 2 1 0 1 15-25 2
BK Brio 3 0 0 3 21-39 0
Tabel Match:
USE [Bowlingserier]
GO
/****** Object: Table [dbo].[Match] Script Date: 09/19/2007 17:25:21 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Match](
[MatchId] [int] NOT NULL,
[Matchstart] [datetime] NULL,
[LagIdHemma] [int] NOT NULL,
[LagIdBorta] [int] NOT NULL,
[Resultathemma] [int] NULL,
[ResultatBorta] [int] NULL,
CONSTRAINT [PK_Match_1] PRIMARY KEY CLUSTERED
(
[MatchId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Match] WITH CHECK ADD CONSTRAINT [FK_Match_Team] FOREIGN KEY([LagIdHemma])
REFERENCES [dbo].[Team] ([TeamId])
GO
ALTER TABLE [dbo].[Match] CHECK CONSTRAINT [FK_Match_Team]
GO
ALTER TABLE [dbo].[Match] WITH CHECK ADD CONSTRAINT [FK_Match_TeamInGroup] FOREIGN KEY([LagIdHemma])
REFERENCES [dbo].[TeamInGroup] ([TeamId])
GO
ALTER TABLE [dbo].[Match] CHECK CONSTRAINT [FK_Match_TeamInGroup]
Tabel Team:
USE [Bowlingserier]
GO
/****** Object: Table [dbo].[Team] Script Date: 09/19/2007 17:28:55 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Team](
[TeamId] [int] NOT NULL,
[Name] [varchar](20) NOT NULL,
[GroupId] [int] IDENTITY(1,1) NOT NULL,
CONSTRAINT [PK_Team] PRIMARY KEY CLUSTERED
(
[TeamId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
Tabel TeamInGroup:
USE [Bowlingserier]
GO
/****** Object: Table [dbo].[TeamInGroup] Script Date: 09/19/2007 17:27:46 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TeamInGroup](
[TeamId] [int] NOT NULL,
[GroupID] [int] NOT NULL,
CONSTRAINT [PK_TeamInGroup_1] PRIMARY KEY CLUSTERED
(
[TeamId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[TeamInGroup] WITH CHECK ADD CONSTRAINT [FK_TeamInGroup_Grupp] FOREIGN KEY([GroupID])
REFERENCES [dbo].[Grupp] ([GroupId])
GO
ALTER TABLE [dbo].[TeamInGroup] CHECK CONSTRAINT [FK_TeamInGroup_Grupp]
Tabel Group:
USE [Bowlingserier]
GO
/****** Object: Table [dbo].[Grupp] Script Date: 09/19/2007 17:29:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Grupp](
[GroupId] [int] NOT NULL,
[SeriesId] [int] NOT NULL,
[Namn] [varchar](50) NULL,
CONSTRAINT [PK_Grupp_1] PRIMARY KEY CLUSTERED
(
[GroupId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[Grupp] WITH CHECK ADD CONSTRAINT [FK_Grupp_Serier] FOREIGN KEY([SeriesId])
REFERENCES [dbo].[Serier] ([SeriesId])
GO
ALTER TABLE [dbo].[Grupp] CHECK CONSTRAINT [FK_Grupp_Serier]
Tabel Series
USE [Bowlingserier]
GO
/****** Object: Table [dbo].[Serier] Script Date: 09/19/2007 17:30:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Serier](
[SeriesId] [int] NOT NULL,
CONSTRAINT [PK_Serier] PRIMARY KEY CLUSTERED
(
[SeriesId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
This is what i dot so far:
SELECT tg.GroupID, t.Name, COUNT(m.ResultatHemma) AS S,
CASE
WHEN m.ResultatHemma - m.ResultatBorta > 0 THEN
COUNT(m.ResultatHemma)
ELSE 0
END AS V,
CASE
WHEN m.ResultatHemma - m.ResultatBorta = 0 THEN
COUNT(m.ResultatHemma)
ELSE 0
END AS O,
CASE
WHEN m.ResultatHemma - m.ResultatBorta < 0 THEN
COUNT(m.ResultatHemma)
ELSE 0
END AS F,
SUM(m.ResultatHemma) AS Hemma, SUM(m.ResultatBorta) AS Borta,
SUM(m.ResultatHemma - m.ResultatBorta) AS Diff,
CASE
WHEN m.ResultatHemma - m.ResultatBorta = 0 THEN 1
ELSE
CASE
WHEN m.ResultatHemma - m.ResultatBorta > 0 THEN 2
ELSE 0
END END AS P
FROM Match AS m INNER JOIN
Team AS t ON m.LagIdHemma = t.TeamId INNER JOIN
TeamInGroup AS tg ON m.LagIdHemma = tg.TeamId
WHERE (m.MatchId = m.MatchId) AND (tg.GroupID = 2 OR tg.GroupID = 1 OR tg.GroupID = 3)
GROUP BY t.Name, tg.GroupID, m.Resultathemma, m.Resultatborta
ORDER BY P DESC, Diff DESC, S DESC
I can't figure out howto group by t.Name and team in Group A,B, and C
Here are some data From Match:
MatchId Matchstart LagIdHemma LagIdBorta Resultathemma ResultatBorta
----------- ----------------------- ----------- ----------- ------------- -------------
700201001 2007-09-08 10:00:00.000 33768 159120 16 4
700201002 2007-09-08 15:00:00.000 33744 159120 16 6
700201003 2007-09-08 11:00:00.000 33894 33407 16 4
700201004 2007-09-08 14:00:00.000 33874 33407 11 9
700201005 2007-09-08 11:00:00.000 33737 32186 10 10
700201006 2007-09-08 16:20:00.000 30896 32186 15 5
700201007 2007-09-08 11:00:00.000 33286 42031 11 9
700201008 2007-09-08 15:00:00.000 33290 42031 14 5
700201009 2007-09-08 11:00:00.000 33628 33722 13 7
700201010 2007-09-08 15:00:00.000 33684 33722 15 5
700201011 2007-09-08 11:00:00.000 43635 33705 9 11
700201012 2007-09-08 15:00:00.000 31346 33705 16 4
700201013 2007-09-15 11:00:00.000 159120 33768 8 12
700201014 2007-09-15 16:00:00.000 33407 33768 11 9
700201015 2007-09-15 11:00:00.000 33874 33744 9 11
700201016 2007-09-15 13:00:00.000 33894 33744 14 6
700201017 2007-09-15 10:00:00.000 32186 33737 12 8
700201018 2007-09-15 16:00:00.000 42031 33737 13 7
700201019 2007-09-15 11:00:00.000 33290 30896 9 11
700201020 2007-09-15 15:40:00.000 33286 30896 10 10
700201021 2007-09-15 11:00:00.000 33722 33628 9 10
700201022 2007-09-15 16:00:00.000 33705 33628 12 8
700201023 2007-09-15 11:00:00.000 31346 33684 8 12
700201024 2007-09-15 15:00:00.000 43635 33684 16 4
Team:
TeamId Name GroupId
----------- -------------------- -----------
30896 Sundbybergs IK F 2
31346 Turebergs IF 3
32186 Örta IF 2
33286 Domnarvets BS 2
33290 Ludvika BK 2
33407 BK Glam 1
33628 BK Amiki 3
33684 Stureby BK 3
33705 BK Brio 3
33722 BK Stallis 3
33737 Uppsala BC90 2
33744 BK Bågen 1
33768 Wåxnäs BC 1
33874 BK Kaskad 1
33894 BK Örnen 1
42031 LBK Hudik 2
43635 Djurgårdens IF 3
159120 IFK Norrköping 1
(18 row(s) affected)
TeamInGroup:
TeamId GroupID
----------- -----------
30896 2
31346 3
32186 2
33286 2
33290 2
33407 1
33628 3
33684 3
33705 3
33722 3
33737 2
33744 1
33768 1
33874 1
33894 1
42031 2
43635 3
159120 1
(18 row(s) affected)
Group:
GroupId SeriesId Namn
----------- ----------- --------------------------------------------------
1 48967 Grupp A
2 48967 Grupp B
3 48967 Grupp C
(3 row(s) affected)
And Serier:
SeriesId
-----------
48967
(1 row(s) affected)
Best regards
Gerten
Can SQL-server Manage Databases With 50 Milion Row/tabel
Sep 24, 2001I'm making a system to data acquisition (production) and need more (3) tabels with a heavy load of data.
3 tabels will contain approximately 20-50 milion rows. Every day I need to add 80000 rows to these tabels. Will I get problems with system-performance with such a configuration? Ofcourse the system will contain index in the database and 2 fast 1 Ghz intel CPU. I isn't possible for me to seperate or archive theese tabel, because of researc-functionality.
Michael
Insert Into Tabel Based On Values In The Table!
May 16, 2008Hi i am trying to create an insert statement that will insert rows into a table based on the information in the table already.
the table looks like this
Groupid field1 field2
-1 100 200
-1 100 300
-1 300 500
-1 300 600
-1 400 100
the insert looks like this
INSERT Into table1(groupid,field1,field2)
select -1,@passedvalue,field2
from table1
where field1 = @passedvalue1
assume @passedvalue = 700, @passwedvalue1 = 100
Now this is fine however i cannot have a duplicate key (key is comibantion of all 3 fields) thus the first time this runs it works however if it runs again it fails - how can i change the where clause to ignore rows that already exist?
eg if @passedvalue = 300 and passedvalue1 = 500
Column Mappings From TXT File To Tabel Columns Using SSIS Package And Tools.
Nov 9, 2007I have flat file (comma delimited) with 200 columns, and i want to import this to sql table using SSIS package, I create a Flat file source and sql server destination items from tool box. in destination item, i can not see the preview, for some reason, it is not reading the rows from source, Do I have to manually each and every column from source to destination under mapping tabl in destination item.
SQL 2000 DTS never required such thing.
any help?
Thanks,
Scan
Oct 8, 2007
I write a work about database, and I want to write the diffrence between Table scan and Index scan. When is the index scan effectient? Use the database a Table scan when there is an index on the table or always a index scan when the index is nonselective? Can be a Table Scan effecient than a index scan?
Scan Density < 50%
Aug 14, 2001I am having problems w/ the indexes on a particular table. Currently the scan density if 25%. I have ran the dbcc dbreindex and the scan density does not improve. I have manually dropped and recreated all of the indexes on the table (there are only two) and still no help.
I have a clustered Primary Key index on my part_number and project_number fields and another index on the project_number field. If I drop the second index and only have my primary key index, it still doesn't help. The fill factor was originally set to 90% and I changed this to 30%, 20%, 10%, 0% and the best scan density I could acheive was 50%.
The data in this table is not updated that often, on average about 15 records a day are updated, and there are only 107 records. This is a small table, but there is a possibility for it to grow rapidly and I want to be prepared now.
Does anyone have any ideas or suggestions? I've tried everything I can think of with no luck.
TIA,
Chris
How To Get Rid Of Table Scan
May 26, 2000Can anyone tell me how to get rid of the Table Scan(1 million rows)being performed on the
The last line, option (loop loin) stopped table scanning the B.ss_manifest and started using the index, I'd like both tables to use the index.
This is the argument I get from execution plan under the table scan.
Object ((D4000).(dbo).(shipstop)as (A))
update drivers set dr_miles_run = case when D1.miles > 0 then d1.miles else 0 end
from (select mf_dr_nbr, sum( case when A.ss_end_dt < '05/17/00' then
( cast((datediff(day, '05/17/00' , B.ss_end_dt ) + 1) as float) /
cast( (datediff(day, A.ss_end_dt , B.ss_end_dt ) + 1) as float) * mf_ld_miles)
else mf_ld_miles end) as miles
from manifest, shipstop A, shipstop B
where mf_manifest_nbr = A.ss_manifest_nbr
and mf_manifest_nbr = B.ss_manifest_nbr
and A.ss_stop_type in ('OR','SA')
and B.ss_stop_type in ('DT','RD')
and ((A.ss_end_dt >= '05/17/00 00:00' and A.ss_end_dt < '05/24/00 00:00')
OR ((B.ss_end_dt >= '05/17/00 00:00' and B.ss_end_dt < '05/24/00 00:00'))) and mf_status > 3 group by mf_dr_nbr ) as D1
where Drivers.dr_driver_nbr = D1.mf_dr_nbr
option (loop join)
Thanks for any ideas!
Count Scan
Aug 21, 2006Hi,
I have a simple temp table which looks like this:
CREATE TABLE #t7e07c01fa80143ff84cb14a2307809f7
(
[AUTOID_TEMP] [int] IDENTITY (1, 1) NOT NULL,
...
)
ON [PRIMARY]
ALTER TABLE #t7e07c01fa80143ff84cb14a2307809f7 ADD
CONSTRAINT [PK_t7e07c01fa80143ff84cb14a2307809f7] PRIMARY KEY NONCLUSTERED
(
[AUTOID_TEMP]
)
ON [PRIMARY]
Insert Into #t7e07c01fa80143ff84cb14a2307809f7
Selet columns... from t....
-- get total records
Declare @TotalCount as int
select @TotalCount = count(AUTOID_TEMP) from #t7e07c01fa80143ff84cb14a2307809f7
Now the above last statement does a index scan. I am new to indexing/tuning and was wondering if its normal - if so why and can I somehow enhance this?
Thanks
Scan Directory
Nov 1, 2007Hey guys,
I have a procedure that runs everyday which takes the IIS log file from the previous day and imports it and calcs values. I would like to change this from taking the previous day to scanning all the file names in the folder and comparing them to a database to see if they have already been scanned before. I already have a table called DatesScanned which lists the filename and scandate.
IE:
D:Logsfile1.log
D:Logsfile2.log
D:Logsfile3.log
D:Logsfile4.log
The 4 file names will be scanned and compared to DatesScanned to see which has been imported already.
Can anyone point me to a resource or information on how I would get the directory listing of a folder so I could compare it to the DatesScanned table.
Thanks a bunch!
Jeff
Scan Count
Jul 23, 2005Hi,Can someone please explain the following1. Meaning of scan count as reported when "statistics io" is turned onprior to running a query.2. In which situations could you have an identical database runningon two diferent servers , with identical database serverconfigurations, running identical queries, with identical query plan,report large discrepency in the scan count . This is one of thepossibilities we are looking at in terms of the reason why one serverruns the job in 12 hours and the other in 24 hours.Server 1--------Table 'TRANS_HISTORY'. Scan count 216, logical reads 897093, physicalreads 44, read-ahead reads 900599.SQL Server Execution Times:CPU time = 27766 ms, elapsed time = 46850 ms.UNIT_NUMBERACCOUNT_TYPETRANSACTION_TYPEServer 2--------Table 'TRANS_HISTORY'. Scan count 491, logical reads 952759, physicalreads 51, read-ahead reads 954414.SQL Server Execution Times:CPU time = 31563 ms, elapsed time = 145595 ms.UNIT_NUMBERACCOUNT_TYPETRANSACTION_TYPEI thank you in advance for your assistance.Puvendran
View 1 Replies View RelatedTable Scan
Jul 9, 2007Does SQL Server allow a table scan to be used when querying a table that has a clustered-index? If yes, could someone please show me the syntax? I have tried with (index(0)) but this appararently means a clustered index scan when there is a clustered index on the table to be queried.
Or does clustered index scan mean the same thing as a table scan when the table has a clustered index? Confused.
Thanks
Table Scan
Nov 28, 2007Friends,
I am using this query in a table with 29,000 records having non-clustered index on emp_id
select * from employee
where emp_id between 100 and 1000
and gender = 'M'
order by emp_id
execution plan shows a table scan in table employee. Any reason?
select * from employee with (index = emp_id)
where emp_id between 100 and 1000
order by emp_id
ofcourse this uses index seek
regards,
Priw
Invalid Log Scan
May 21, 2007
I do not understand it but by connection to my database seems to keep crapping out. I get the below error and my app appears to be unable to access the connection. Then a couple restarts later it tells me that my login under my Windows User failed . The database is there and besides maybe a couple records longer there isnt anything corrupt about the data, and in fact, if I restart the entire PC most times it will allow me to connect again. I can even still access the data tables through the C# editor. Any idea why this error is being thrown?
Thx
Code SnippetSystem.Data.SqlClient.SqlException was unhandled
Message="A system assertion check has failed. Check the SQL Server error log for details
The log scan number (35:460:2) passed to log scan in database 'F:\PDLOGSHEET\PDLOGSHEET\BIN\DEBUG\DATABASE1.MDF' is not valid. This error may indicate data corruption or that the log file (.ldf) does not match the data file (.mdf). If this error occurred during replication, re-create the publication. Otherwise, restore from backup if the problem results in a failure during startup.
An error occurred during recovery, preventing the database 'F:\PDLOGSHEET\PDLOGSHEET\BIN\DEBUG\DATABASE1.MDF' (database ID 26) from restarting. Diagnose the recovery errors and fix them, or restore from a known good backup. If errors are not corrected or expected, contact Technical Support.
Cannot open user default database. Login failed.
Login failed for user 'GC\cbcottier'.
Location: logscan.cpp:1925Expression: UtilDbccIsInsideDbcc ()SPID: 51Process ID: 3640
Location: logscan.cpp:1925Expression: UtilDbccIsInsideDbcc ()SPID: 51Process ID: 3640"
Source=".Net SqlClient Data Provider"
ErrorCode=-2146232060
Class=20
LineNumber=65536
Number=3624
Procedure=""
Server="\\.\pipe\E74940B1-0BD7-42\tsql\query"
State=1
StackTrace:
at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)
at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
at System.Data.SqlClient.SqlConnection.Open()
at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)
at PDLogSheet.Database1DataSetTableAdapters.ReportTitlesTableAdapter.Fill(ReportTitlesDataTable dataTable) in F:PDLogSheetPDLogSheetDatabase1DataSet.Designer.cs:line 4362
at PDLogSheet.frmLogSheet.frmLogSheet_Load(Object sender, EventArgs e) in F:PDLogSheetPDLogSheetfrmLogSheet.cs:line 42
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd, Int32 nCmdShow)
at System.Windows.Forms.Control.SetVisibleCore(Boolean value)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at PDLogSheet.Program.Main() in F:PDLogSheetPDLogSheetProgram.cs:line 17
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)
at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
SUM Uses Table Scan But Not Index
Jan 16, 2002Hi I'm issuing a SELECT on a field with the SUM on SQL Server 7. I have an index on the field in the WHERE clause but upon analysis, the Query Optimizer always uses a Full Table Scan. Can anyone explain why and is there a way to use the index.
HEre's the structure:
SELECT SUM(colA)
FROM TABLE tblB
GROUP BY colC
An index exists on column colC.
Thanks
How To Impove Scan Density
Aug 27, 2001Case
I run dbcc showcontig
Result
DBCC SHOWCONTIG scanning 'rpRateCode' table...
Table: 'rpRateCode' (213627854); index ID: 1, database ID: 17
TABLE level scan performed.
- Pages Scanned................................: 2
- Extents Scanned..............................: 2
- Extent Switches..............................: 1
- Avg. Pages per Extent........................: 1.0
- Scan Density [Best Count:Actual Count].......: 50.00% [1:2] !!!!!!!
- Logical Scan Fragmentation ..................: 0.00%
- Extent Scan Fragmentation ...................: 50.00%
- Avg. Bytes Free per Page.....................: 3088.5
- Avg. Page Density (full).....................: 61.84%
Bellow is table structure
CREATE TABLE [dbo].[rpRateCode] (
[ID_RateCode] [ID] NOT NULL ,
[ID_ScheduleOfPresence] [ID] NULL ,
[ID_ScheduleOfBilling] [ID] NULL ,
[IsExtensible] [bit] NOT NULL ,
[IsFixedRate] [Boolean] NOT NULL ,
[ID_RateCodeFollow] [ID] NULL ,
[ID_RateDef] [ID] NULL ,
[ID_MarketSegment] [ID] NOT NULL ,
[ID_HskLevelPattern] [ID] NULL ,
[ComplimentaryType] [AType] NULL ,
[BillingType] [AType] NULL ,
[Discriminator] [Discriminator] NOT NULL ,
[PrintRateOnConfirm] [Boolean] NOT NULL ,
[PrintRateOnArrivalList] [Boolean] NOT NULL ,
[PrintRateOnRegCard] [Boolean] NOT NULL ,
[MinNights] [NbOfNights] NULL ,
[MaxNights] [NbOfNights] NULL ,
[IsLimited] [Boolean] NULL ,
[presencetype] [tinyint] NULL ,
[RateNote] [varchar] (60) NULL ,
[IsAgeCatDiffRoom] [Boolean] NULL ,
[ID_Currency] [ID] NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[rpRateCode] WITH NOCHECK ADD
CONSTRAINT [PK__rpRateCode__2EBAFAC0] PRIMARY KEY CLUSTERED
(
[ID_RateCode]
) ON [PRIMARY]
GO
My question how to increase Scan Density for this table if CLUSTERED index exist?
Index Seek Vs Scan
Nov 4, 2002I have created a nolock view off a table to prevent locks. I have users coming in through MS Access that have switched their queries to run against the views. Now we are noticing that queries that used to run as a clustered index seek against the table are running as a clustered index scan against the table and performance in the queries has dropped.
Is there any way that the same query that hits the view instead of the table can be made to run faster or at least use the index seek?
Thanks,
Steve
Scan Density Question
Dec 16, 2005Can someone explain why i can drop and recreate indexes on say 2 tables and they had a scan densitiy of say 15% and 10%.
After i recreate the indexes on both tables one comes back with a scan density of 100% and the other only 25%.
What would cause this table to only go to 25% and not 100% like i want it to be?
Thanks for your help :)
Is My Table Scan Unavoidable?
Jun 10, 2004Hi guys-n-gals...
I have a table that contains the following:
PortfolioID(int), EndDate(smalldatetime), Begdate(smalldatetime), WklyCloseIndex (float)
It has a primary key which is PortfolioID/BegDate/EndDate
I need to create a table that summarizes, by date range, the weeklycloseindex of several portfolios, like this:
BegDate EndDate Portfolio2 Portfolio67 Portfolio11 Portfolio90
05/28/2004 06/04/2004 xx.xx xx.xx xx.xx xx.xx
05/21/2004 05/28/2004 xx.xx xx.xx xx.xx xx.xx
So I wrote a function...
This function results in a table scan *GASP!!!!* (at least that's what the 'splain plan tells me when I run it in SQL Analyzer). Before I made it into the function, when I was testing the code in SQL Analyzer, it resulted NOT in a table scan, but rather a series of nested loops (the joins) and clustered index seeks...resulting in about 1/3 the total cost of the function.
I suspected originally that it was the TOP/ORDER BY that the function insisted upon, but even if I remove those, still get a table scan.
Wassup? Why does the function turn my cool lil' self-join into a table scan? Whut am I missing? Any thoughts? Disgusted Derisions? Hurled Insults? Bring it on!!! (please! ;) )
My predecessor did this in a similar project using a separate cursor for each portfolio by date, then looped through the dates, pulling in the per-portfolio index value and building the output table. I would rather avoid the cursors if I can.
Clustered Index Scan
Apr 8, 2008I am running a SELECT on a table. This READ operation ends up going through Clustered Index Scan. I want to know whether Clustered Index Scan , blocks other concurrent transactions trying to INSERT into this table? Does Clustered Index Scan locks the entire clustered index?
View 3 Replies View RelatedLogical Scan Fragmentation
Aug 16, 2007I have a table with 50% Logical Scan Fragmentation. [ according to Dbcc Showcontig (myTable) ]
Why after running DBCC INDEXDEFRAG (myDB,myTable) does it still sit at 50%.
Why isn't it lower?
Scan Path Of Image
Feb 25, 2008Hi all,
I have a scanner that dump the images into a directory. Because of thousand images dump per day, I want to moved the images into another directory each day as nightly schedule. However I like the path of the images moved stored into the database, to retrieve later. Have anyone design something like this? Right now, I get the file name from the text files, import to the database and update the path directory. I was hoping to get away from this...and do this as a jobs.
thanks
Table-Scan Speed
Oct 2, 2007I have the following scenario (with 2K5 Express)
I have a table with 160.000 records.
I have to retrieve 10.000 - 40.000 records by their ids (<3seconds would be sufficent)
I first used single requests, then one single command as batch (simply joined the single commands into one string).
But that was very slow (30 seconds if cached). so I created one big statement
select myfields
from mytable where id in(1,2,..,35000)
if everything is cached the speed is fine (<1second), but if I retrieve the data for the first time
it takes 15-30 seconds, that's a bit too slowish.
the total database size is 100MB - so a file scan should be faster, I thought at least
so HERE is the problem why I post this
to force the table scan I used
Select myFields From mytable With (Index(0) ...
that took > 3 minutes
I tested the raw IO-time, that was 2,5-3 seconds with the db-file
has SQL Server a problem with the 35.000 items in the condition?
(If it loopes 35.000 x 160.000 times instead of using a hash for the items that would explain the slow speed)
or another reason:
is table scanning always much slower then the raw io operations?
the id-index is not grouped and ( I really don't know why) not marked as primary key,
but that shouldn't have any impact on a file-scan, I guess.
Has anyone faced (and solved) a similiar problem?