How To Get Rid Of Table Scan

May 26, 2000

Can 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!

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What Is The Difference Between Clustered Index Scan And Table Scan

Jan 29, 2006

How 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?

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IF NOT EXISTS (... - EXISTS TABLE : Nested Iteration. Table Scan.Forward Scan.

Sep 20, 2006

Hi,

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.

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Oct 4, 2007



Hey,

what is the difference between Table Scan und Index Scan?

I find no difitions in the internet

Finchen

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Sep 21, 2007

Hi,
I want to know wht is a


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INDEX SCAN
INDEX SEEKand When they are used, Wht is the difference between all these.????

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Jul 9, 2007

Does 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.

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Nov 28, 2007

Friends,

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

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Jan 16, 2002

Hi 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)
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GROUP BY colC

An index exists on column colC.

Thanks

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Jun 10, 2004

Hi guys-n-gals...

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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.

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Oct 2, 2007

I have the following scenario (with 2K5 Express)

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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
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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
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that took > 3 minutes

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has SQL Server a problem with the 35.000 items in the condition?
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or another reason:
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the id-index is not grouped and ( I really don't know why) not marked as primary key,
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I have following query to delete the data from fact history table based on fact table. logid, level and post_date uniquely identify the rows on both fact and history table. I want to create indexes on the joined columns.I tried with clustered index (logid, level and post_date) it gives clustered index scan. I also tried with non clustered indexes on each column (logid, level and post_date) but still getting table scan.
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DELETE xbar_fact_history
FROM xbar_fact_history AS a
INNER JOIN xbar_fact AS b
ON a.logid = b.logid
AND a.level = b.level
AND a.post_date = b.post_date
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______________________________________________________________
Thanks
Sanjeev

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Apr 30, 2001

Hello,

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Any ideas why this would be causing such a problem? I've included a simplified version of the update below. The "or" statements actually continue for all columns in the table. The same trigger template is used for all tables in the database and none of the others seem to exhibit this behavior as far as I can tell.

Thanks for any help!
-Tom.

UPDATE H_MyTable
SET HIST_END_DT = @tran_date
FROM H_MyTable his
INNER JOIN deleted del ON (his.PrimaryKey1 = del.PrimaryKey1) and
(his.PrimaryKey2 = del.PrimaryKey2)
INNER JOIN inserted ins ON (his.PrimaryKey1 = ins.PrimaryKey1) and
(his.PrimaryKey2 = ins.PrimaryKey2)
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and ((IsNull(del.PrimaryKey1, -918273645) <>
IsNull(ins.PrimaryKey1, -918273645)) or
(IsNull(del.PrimaryKey2, -918273645) <>
IsNull(ins.PrimaryKey2, -918273645)) or
(IsNull(del.Column3, -918273645) <>
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I am giving that kind of similar query below

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-- create two test tables
create table dbo.test1
(testID int, TestName varchar(10))

create table dbo.test2
(testID int, TestName varchar(10))

-- populate
declare @i int
set @i = 1000
while @i > 0
begin
insert into dbo.test1
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set @i = @i - 1
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insert into dbo.test2
select 1, '2.1' union all
select 2, '2.2'
go

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create view dbo.vw_Test
as
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TestName
fromdbo.Test1
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TestName
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-- joining to a table triggers scan of both tables in view:
declare @table table (QueryID int)
insert into @table
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selectvt.TestName
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vt.QueryID = t.QueryID



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Nathan Skerl

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Here's a partial table description:

CREATE TABLE [dbo].[Summaries_MO]
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[Code] .....

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As I've investigated this issue I also tried:

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hi
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so how to
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Code Snippet
SELECT TRIM(fieldname)
, LTRIM(fieldname)
, RTRIM(fieldname)
, LTRIM(RTRIM(fieldname))
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Code Snippet
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Code Snippet
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Code SnippetSystem.Data.SqlClient.SqlException was unhandled
Message="A system assertion check has failed. Check the SQL Server error log for details
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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
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Hi All,


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Case
I run dbcc showcontig
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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] !!!!!!!
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- Extent Scan Fragmentation ...................: 50.00%
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- 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

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Hi 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

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Query Logical, Scan Reads?

Dec 22, 2000

Hi Everybody,

One of my friend asked me "How do we reduce the query logical, scan reads
in SQL Server?".

I really don't know, how to answer him.

Can anybody explain me regarding this.

thanks,
Srini

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Oct 25, 2002

Can anyone let me now why the extent scan fragmentation is very high.
I do have a clustered index on this table .
The fill factor is 0 and this table has high inserts as it is used to maintain history.
Rebuilding the Indexes did not help.

DBCC SHOWCONTIG scanning 'ACCOUNTS' table...
Table: 'ACCOUNTS'(1061578820); index ID: 1, database ID: 5
TABLE level scan performed.
- Pages Scanned................................: 728157
- Extents Scanned..............................: 91759
- Extent Switches..............................: 93305
- Avg. Pages per Extent........................: 7.9
- Scan Density .......: 97.55% [91020:93306]
- Logical Scan Fragmentation ..................: 0.33%
- Extent Scan Fragmentation ...................: 99.99%
- Avg. Bytes Free per Page.....................: 76.6
- Avg. Page Density (full).....................: 99.05%
DBCC execution completed. If DBCC printed error messages, contact your system administrator

Thanks in advance,
Shades[B]Extent Scan Fragmentation

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Oct 23, 1999

A few days after droping and recreating noclustered indexes on a large table, scan density of most indexes falls below 20%. Only a few number of rows has deleted. Update operation didn't update these keys and there was a lot of inserts. Could anyone explain why are indexes fragmented so much?

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