Run Database Slower

Oct 13, 2004

I have database, Visual basic as front end, and sql server as backend, the reports are using crystal report. Recently, the user complain it is too slow to run, it took a long to load the data, anybody help me? Thanks in advance.

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Help Cursor Based Stored Procedure Is Getting Slower And Slower!

Jul 20, 2005

I am begginner at best so I hope someone that is better can help.I have a stored procedure that updates a view that I wrote using 2cursors.(Kind of a Inner Loop) I wrote it this way Because I couldn'tdo it using reqular transact SQL.The problem is that this procedure is taking longer and longer to run.Up to 5 hours now! It is anaylizing about 30,000 records. I thinkpartly because we add new records every month.The procedure works like this.The first Cursor stores a unique account and duedate combination fromthe view.It then finds all the accts in the view that have that account duedatecombo and loads them into Cursor 2 this groups them together for datamanipulation. The accounts have to be grouped this way because aaccount can have different due dates and multiple records within eachaccount due date combo and they need to be looked at this way aslittle singular groups.Here is my procedure I hope someone can shead some light on this. Myboss is giving me heck about it. 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= 0)BEGINSELECT @rec_upd = 'N 'DECLARE ACT_CUR2 CURSOR FORSELECTB.ACCT_NUM,B.ACTIVITY_DATE,B.PROMISE_AMT_1,B.PROMISE_STATUS,B.CURRENT_DUE_AMT,B.DAYS_DELINQUENT_NUM,B.PROMISE_DATE_1FROM VWAPPLICABLEPROMISEACTIVITYRECORDS B (UPDLOCK)WHERE B.ACCT_NUM = @mAcct_Num1ANDB.DUE_DATE = @mDueDate1ORDER BY B.ACCT_NUM,B.DUE_DATE,B.ACTIVITY_DATE,CASEB.Time_ObtainedWHEN 0 THEN 0ELSE 1END Desc, B.Time_ObtainedOPEN ACT_CUR2FETCH NEXT FROM ACT_CUR2INTO @mAcct_Num2 ,@mActivity_Date2,@mPromise_Amt_1,@mPromise_Status ,@mCurrent_Due_Amt,@mDPD,@mPromise_DateWHILE (@@FETCH_STATUS = 0)BEGIN----CHECK------------------------------------------------------------------------DECLARE @PrintVariable2 VARCHAR (8000)--SELECT @PrintVariable2 = CAST(@MACCT_NUM2 AS VARCHAR)+''+CAST(@MACTIVITY_DATE2 AS VARCHAR)+' '+CAST(@MPROMISE_AMT_1 ASVARCHAR)+' '+CAST(@MPROMISE_STATUS AS VARCHAR)+''+CAST(@mCurrent_Due_Amt AS VARCHAR)+' '+CAST(@mDPD AS VARCHAR)+''+CAST(@mPromise_Date AS VARCHAR)--PRINT @PrintVariable2----ENDCHECK------------------------------------------------------------IF @mDPD >= 30BEGINSELECT @tot_pay = SUM(CONVERT(FLOAT, C.PAY_AMT))FROM vwAplicablePayments CWHERE C.ACCT_NUM = @mAcct_Num2ANDC.ACTIVITY_DATE >= @mActivity_Date2ANDC.ACTIVITY_DATE < @mActivity_Date2 + 15----CHECK------------------------------------------------------------------------DECLARE @PrintVariable3 VARCHAR (8000)--SELECT @PrintVariable3 ='Greater=30 DOLLARS COLLECTED'--PRINT @PrintVariable3----ENDCHECK------------------------------------------------------------ENDELSE IF @mDPD < 30BEGINSELECT @tot_pay = SUM(CONVERT(FLOAT, C.PAY_AMT))FROM vwAplicablePayments CWHERE C.ACCT_NUM = @mAcct_Num2ANDC.ACTIVITY_DATE >= @mActivity_Date2ANDC.ACTIVITY_DATE BETWEEN @mActivity_Date2 AND@mPromise_Date + 5----CHECK----------------------------------------------------------------------DECLARE @PrintVariable4 VARCHAR (8000)--SELECT @PrintVariable4 ='Less 30 DOLLARS COLLECTED'--PRINT @PrintVariable4----END CHECK------------------------------------------------------------END----------------------------------------MY REVISEDLOGIC-------------------------------------------------------IF @rec_upd = 'N'BEGINIF @mDPD >= 30BEGINSELECT @mActivityDate2_temp = @mActivity_Date2 + 15--DECLARE @PrintVariable5 VARCHAR (8000)--SELECT @PrintVariable5 =' GREATER= 30 USING ACTVITY_DATE+15'--PRINT @PrintVariable5ENDELSE IF @mDPD < 30BEGINSELECT @mActivityDate2_temp = @mPromise_Date + 5--DECLARE @PrintVariable6 VARCHAR (8000)--SELECT @PrintVariable6 =' LESS 30 USING PROMISE_DATE+5'--PRINT @PrintVariable6ENDIF @tot_pay >= 0.9 * @mCurrent_Due_Amt--used to be promise amtBEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET PROMISE_STATUS = 'PK',TOTAL_DOLLARS_COLL = @tot_payWHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto PK.IF @mPromise_Status IN ('PTP','OP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @todays_dateWHERE CURRENT OF ACT_CUR2ENDSELECT @rec_upd = 'Y 'ENDIF ((@tot_pay < 0.9 * @mCurrent_Due_Amt) OR @tot_pay IS NULL)AND( @mActivityDate2_temp > @todays_date )--need to put 1dayof month here for snapshot9/01/2004BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSETPROMISE_STATUS = 'OP'WHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto OP which is the original Activity Date.--The record will hold this date until it goes into PK,PB,orIP.IF @mPromise_Status IN ('PTP','OP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @mActivity_Date2WHERE CURRENT OF ACT_CUR2ENDENDELSE IF ((@tot_pay < 0.9 * @mCurrent_Due_Amt) OR @tot_pay ISNULL)AND( @mActivityDate2_temp <= @todays_date )--need to put 1dayof month here for snapshot 9/01/2004BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSETPROMISE_STATUS = 'PB',TOTAL_DOLLARS_COLL = case when @tot_pay is nullthen 0 else @tot_pay endWHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto PB.IF @mPromise_Status IN ('PTP','OP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @todays_dateWHERE CURRENT OF ACT_CUR2ENDENDENDELSE IF @rec_upd = 'Y'BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSETPROMISE_STATUS = 'IP',TOTAL_DOLLARS_COLL = 0WHERE CURRENT OF ACT_CUR2--This statement updates the time that the status was placedinto IP.IF @mPromise_Status NOT IN ('IP')BEGINUPDATE VWAPPLICABLEPROMISEACTIVITYRECORDSSET Status_Date = @todays_dateWHERE CURRENT OF ACT_CUR2ENDENDFETCH NEXT FROM ACT_CUR2 INTO @mAcct_Num2,@mActivity_Date2,@mPromise_Amt_1,@mPromise_Status ,@mCurrent_Due_Amt,@mDPD,@mPromise_DateENDCLOSE ACT_CUR2DEALLOCATE ACT_CUR2FETCH NEXT FROM ACT_CUR1 INTO @mAcct_Num1 , @mDueDate1ENDCLOSE ACT_CUR1DEALLOCATE ACT_CUR1SET NOCOUNT OFFENDGO

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hi, friends, please look at this:

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2. I have a VB script component, I direct the object I got in 1 step into the script as a dataset.


My problem is:
I run the package in the SQL SERVER 2005 Store Procedue like this:

do
dtexec.exe package.dtsx
loop untill i>t

I control the it runs 30 times. But I found that the speed is slower and slower.
the first time, it takes about 600 s, but the last time, it takes the 1800 s.

Why?
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Package...............................SP1...............................SP2

Load dimensions..................200.................................270

Load fact data.......................800...............................1600

Process cubes....................2100...............................2600



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Hi gurus
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* Part 1 creates and then populates a temporary table

* Part 2 is a select query which joins the temporary table to a permanent table, on 2 fields including a datetime field. The data types on each side of the join are identical.

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Thanks
Jo

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Any thoughts ??


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Hi there,

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These are the steps I have done to try and improve performance, all to no avail.

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I have run an Optimize Index Task.
I have run a Rebuild Index Task.
I have run an Update Statistics Task.
I have defragged the drive that the database resides on.

Can anyone explain why SQL 2003 is dramatically slower than 2000? Any help would be greatly appreciated.

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Hi there,

I am an application programmer who uses SQL Server; I'm not an expert and just know the basics. Our application has approximately 300 SQL tables and each table has just one primary index. We don't have stored procedures and only have 3 Views that a couple of reports use. Our database is approximately 26GB in size. We are planning on migrating from SQL 2000/Windows Server 2000 to SQL 2005/Windows Server 2003. Before doing this I decided to do some bench mark testing. I chose a simple SELECT statement on one of our larger tables. On SQL 2000 it ran in 22 seconds whereas on SQL 2005 it ran in 34 seconds.

These are the steps I have done to try and improve performance, all to no avail.

I tried both a passive and active upgrade and the results were the same. The passive way was to remove 2000, install 2005, create a new database and restore from a 2000 backup into the new 2005 database. The active way was to leave 2000 on the server with the database attached and upgrading to 2005.
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I have run an Optimize Index Task.
I have run a Rebuild Index Task.
I have run an Update Statistics Task.
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Hi there,



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These are the steps I have done to try and improve performance, all to no avail.

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I have run an Optimize Index Task.
I have run a Rebuild Index Task.
I have run an Update Statistics Task.
I have defragged the drive that the database resides on.

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ALTER FUNCTION [dbo].[fnGetiii]
(
bla bla bla
)
RETURNS @ItemTable TABLE
(
a varchar(2),
b bigint,
c smallmoney,
d varchar(50),
e varchar(50),
f int,
g varchar(50),
h datetime,
i int,
j int,
k int
)
AS
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vat.a AS a,
vat.b AS b,
vat.c AS c,
vat.d AS d,
vat.e AS e,
vat.f AS f,
vat.g AS g,
vat.h AS h,
vat.i AS i,
vat.j AS j,
vat.k AS k
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LEFT JOIN dbo.iop iop
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RETURN
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How can I speed it up?


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Here is the origional




Code Snippet

WHERE (j.datelaunched > GETDATE() - 7 OR (j.jobtype_id = 2 AND j.datecreated > GETDATE() - 30)

Here is the optomized




Code Snippet

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Here's the looped section of code:


-- now delete the entries with no content

declare @deleted int

set @deleted = 1

declare @tmp table ([Id] int)

while @deleted <> 0

begin


delete from @tmp

-- get all entries with no child nodes

insert into @tmp ([Id])


select distinct r.[id] from @tblResults r

where r.[id] not in

(

select [Id] from @tblResults

where [Id] in (select distinct ParentId from @tblResults)

)


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-- (this is where the slowdown occurs)

delete from @tblResults

where [id] in

(


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(select distinct dm.metatagid from documentmetatag dm

where dm.documentid in


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)

)

)


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end




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- Average CPU Utilization is up from 22% to 32% and we're trying to figure out why

- Compilations per second are up from 200 to 250

- Recompilations per second are down from 5 to 1 (which is good).

- Memory utilization is identical.

- We see exagerated spikes in response times. The general performance

seems pretty good - but there are periodic spikes that hurt our averages.

- I examined perfmon for waits and nothing jumped out.

- A small handful of application workflows are much slower, while most are roughly identical.



I realize there could be a zillion different causes. But if anyone has experience upgrading a large OLTP solution which uses a mixture of dynamic SQL and stored procedures to SS2005 - and tuning the upgraded database - please offer any suggestions.



Our current plan includes (a) running the Best Practices analyzer which already uncovered a trace flag we may want to use since we're running on an 8-way, (b) rebuilding indexes, and (c) examine a SQL Trace this time around too since it appears the slowness is isolated to certain application workflows.



Please offer any suggestions that have worked for your team.



Thanks so much!

Mike



PS I will post all the things we end up doing in the end once we get performance equal or better - hopefully the latter!!!

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Hello,

I am experiencing that my SISS packages are executing faster during development from within the Sql Business Intelligence Development Studio environment than when I execute them with dtexecui after I have deployed them as either File System Or Sql Server deployments.

After deployment the packages run about twice a long as they do from within Sql Business Intelligence Development Studio (i.e they reference the same data and are executed on the same machine).

In short the packages import data, during this import stage the data is massaged certain calculations are performed thereon where after this massaged data is used to perform further calculations.

A summary of tools used in SISS are Execute Sql Task, Flat File Source, Oledb Destination, Data Conversion, Aggregate, Conditional Split, Merge, For Each Ado Enumerators, Script Tasks, Derived Columns and Recordset Destinations.

In terms of time from within Sql Business Intelligence Development Studio when the packages are executed for 1 month's data the total combined time is about 10 minutes and when deployed as either File System Or Sql Server deployments they run for about 20 minutes. My problem is when they are executed for a years data instead of running for 120 minutes they run for at least 240 minutes or longer.


Is this normal or am I missing some settings when building the package for deployment?

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Aug 1, 2006

I've found a very interesting case where SQL 2005 is more than 4 times slower than its predecessor, despite superior hardware.

To compare, I have some logs from the ISA Server has stored into the database, which is then filtered against my blocklists. The result are the most popular sites I have not blocked or trusted.
I have done some tuning on the query to utilize the data patterns that are in the database. This allows much better scaling towards large datasets. The engine is now capable to use hash-matches instead of nested loops over the entire datasets.

It currently runs in 1 to 1.5 minutes on SQL 2000, which is powered by a VIA C3 Nehemiah at 1 GHz, with only 350 MB RAM too spare in optimistic conditions (The remainder of the 1 GB is used by many other applications). THe server is limited to 384 MB memory usage.
The other box running SQL 2005 is a Athlon 800 MHz, which has superior processing power, larger cache and more memory bandwidth and has 1.25 GB RAM, where SQL server can use the needed 629 MB without any problem.
Despite these facts, my query takes more than 4 times longer on the SQL 2005 box. 1.5 minutes compared to 7 to 8 minutes.

SQL 2000 Database Schema:

CREATE TABLE [dbo].[WebProxyLog](
[ClientIP] [bigint] NOT NULL,
[ClientUserName] [nvarchar](514) NOT NULL,
[ClientAgent] [varchar](128) NOT NULL,
[ClientAuthenticate] [smallint] NOT NULL,
[logTime] [datetime] NOT NULL,
[service] [smallint] NOT NULL,
[servername] [nvarchar](32) NOT NULL,
[referredserver] [varchar](32) NOT NULL,
[DestHost] [varchar](255) NOT NULL,
[DestHostIP] [bigint] NOT NULL,
[DestHostPort] [int] NOT NULL,
[processingtime] [int] NOT NULL,
[bytesrecvd] [bigint] NOT NULL,
[bytessent] [bigint] NOT NULL,
[protocol] [varchar](12) NOT NULL,
[transport] [varchar](8) NOT NULL,
[operation] [varchar](24) NOT NULL,
[uri] [varchar](2048) NOT NULL,
[mimetype] [varchar](32) NOT NULL,
[objectsource] [smallint] NOT NULL,
[resultcode] [int] NOT NULL,
[CacheInfo] [int] NOT NULL,
[rule] [nvarchar](128) NOT NULL,
[FilterInfo] [nvarchar](128) NOT NULL,
[SrcNetwork] [nvarchar](128) NOT NULL,
[DstNetwork] [nvarchar](128) NOT NULL,
[ErrorInfo] [int] NOT NULL,
[Action] [varchar](32) NOT NULL,
[GmtLogTime] [datetime] NOT NULL
)

CREATE TABLE [dbo].[TrustedHosts](
[Hostname] [varchar](60) NOT NULL,
[Comment] [varchar](500) NULL,
CONSTRAINT [PK_TrustedHosts] PRIMARY KEY CLUSTERED
(
[Hostname] ASC
) ON [PRIMARY]
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[DeniedHosts](
[ReasonId] [smallint] NOT NULL,
[Hostname] [varchar](80) NOT NULL,
[Path] [varchar](50) NOT NULL CONSTRAINT [DF_DeniedHosts_Path] DEFAULT ('%'),
[Comment] [varchar](500) NULL,
CONSTRAINT [PK_DeniedHosts] PRIMARY KEY CLUSTERED
(
[Hostname] ASC,
[ReasonId] ASC,
[Path] ASC
) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[DeniedHosts] WITH NOCHECK ADD CONSTRAINT [FK_DeniedHosts_DenyReason] FOREIGN KEY([ReasonId]) REFERENCES [dbo].[DenyReason] ([ReasonId])
GO
ALTER TABLE [dbo].[DeniedHosts] CHECK CONSTRAINT [FK_DeniedHosts_DenyReason]
GO
ALTER TABLE [dbo].[DeniedHosts] WITH NOCHECK ADD CONSTRAINT [CK_DeniedHosts_HostName_NoTwoDots] CHECK ((((not([Hostname] like '%..%')))))
GO
ALTER TABLE [dbo].[DeniedHosts] CHECK CONSTRAINT [CK_DeniedHosts_HostName_NoTwoDots]
GO
ALTER TABLE [dbo].[DeniedHosts] WITH NOCHECK ADD CONSTRAINT [CK_DeniedHosts_NoPercentDot] CHECK (([Hostname] <> '%.'))
GO
ALTER TABLE [dbo].[DeniedHosts] CHECK CONSTRAINT [CK_DeniedHosts_NoPercentDot]
GO
ALTER TABLE [dbo].[DeniedHosts] WITH NOCHECK ADD CONSTRAINT [CK_DeniedHosts_NoWildcardMiddle] CHECK ((((not([Hostname] like '_%[%]%')))))
GO
ALTER TABLE [dbo].[DeniedHosts] CHECK CONSTRAINT [CK_DeniedHosts_NoWildcardMiddle]
GO
ALTER TABLE [dbo].[DeniedHosts] WITH NOCHECK ADD CONSTRAINT [CK_DeniedHosts_ValidPath] CHECK (([Path] is null or [Path] = '%' or [Path] like '/%' and [Path] <> '' and [Path] <> '/%'))
GO
ALTER TABLE [dbo].[DeniedHosts] CHECK CONSTRAINT [CK_DeniedHosts_ValidPath]
GO
ALTER TABLE [dbo].[DeniedHosts] WITH NOCHECK ADD CONSTRAINT [CK_DeniedHosts_WildcardStart] CHECK ((((not([Hostname] like '[%]%'))) or ([Hostname] like '[%].%' or [Hostname] = '%')))
GO
ALTER TABLE [dbo].[DeniedHosts] CHECK CONSTRAINT [CK_DeniedHosts_WildcardStart]


I'm not going to give you any data as:
WebProxyLog contains 1 223 878 rows; 524 MB (few more on SQL 2000 database).
DeniedHosts contains 52 338 rows; 3 MB
TrustedHosts contains 2 183 rows; <1 MB

The relevant query is:

CREATE PROCEDURE [dbo].[GetTrustedHosts]
AS
SELECT Hosts, Requests --, DistinctRequests
FROM(SELECT AA.Hosts, COUNT(*) AS Requests, COUNT(DISTINCT Path) AS DistinctRequests
FROM(SELECTCASE
WHEN CHARINDEX('':'', SUBSTRING(URI, 8, CHARINDEX(''/'', URI, 8)-8), 8) <> 0 THEN SUBSTRING(URI, 8, CHARINDEX('':'', URI, 8)-8)
ELSE SUBSTRING(URI, 8, CHARINDEX(''/'', URI, 8)-8)
END AS Hosts,
SUBSTRING(URI, CHARINDEX(''/'', URI, 8), 50) AS Path
FROM dbo.WebProxyLog wpl
WHERE URI LIKE 'http://%/%'
AND ResultCode BETWEEN 200 AND 399
AND (Service = 1) -- filter for only forward proxy
) AA
WHERE NOT EXISTS
(SELECT *
FROM dbo.DeniedHosts dhp
WHERE Path <> ''%''
AND LEFT(AA.Path,3) = LEFT(dhp.Path COLLATE SQL_Latin1_General_CP1_CI_AS, 3)
AND AA.Hosts LIKE (dhp.Hostname COLLATE SQL_Latin1_General_CP1_CI_AS)
AND ( AA.Path LIKE (dhp.Path COLLATE SQL_Latin1_General_CP1_CI_AS) OR AA.Path LIKE ((dhp.Path COLLATE SQL_Latin1_General_CP1_CI_AS) + ''[?]%'') )
)
AND NOT Hosts IS NULL-- this seems to give a speed advantage
GROUP BY AA.Hosts
HAVING COUNT(*) >= 25
) A
WHERE NOT Hosts IN
(SELECT Hostname COLLATE SQL_Latin1_General_CP1_CI_AS
FROM dbo.TrustedHosts thc
--WHERE NOT thc.Hostname LIKE ''%[%]%''
)
AND NOT Hosts IN
(SELECT Hostname COLLATE SQL_Latin1_General_CP1_CI_AS
FROM dbo.DeniedHosts dhc
WHERE dhc.Path = ''%''
)
AND NOT EXISTS
(SELECT *
FROM dbo.TrustedHosts thh
WHERE A.Hosts LIKE (thh.Hostname COLLATE SQL_Latin1_General_CP1_CI_AS)
AND thh.Hostname LIKE ''[%]%''
-- generates a hash join instead of a of nested loop
AND RIGHT(A.Hosts,6) = (RIGHT(thh.Hostname,6) COLLATE SQL_Latin1_General_CP1_CI_AS)
)
AND NOT EXISTS
(SELECT *
FROM dbo.DeniedHosts dhh
WHERE dhh.Path = ''%''
-- this reduces the cost of the most expensive query
AND dhh.Hostname LIKE ''[%]%''
AND A.Hosts LIKE (dhh.Hostname COLLATE SQL_Latin1_General_CP1_CI_AS)
-- generates a hash join instead of a of nested loop
-- performance difference is significant due to volume
AND RIGHT(A.Hosts,6) = (RIGHT(dhh.Hostname,6) COLLATE SQL_Latin1_General_CP1_CI_AS)
)
ORDER BY Requests DESC


There is some mess with collations, but these don't seem to hurt performance.

The query plans provided differ only slightly.
SQL 2000 provides a Clustered Index Scan over WebProxyLog with predicate on resultcode. After this a filter for the LIKE operator. Cost is 78% for the scan and 10% for the filter.
SQL 2005 combines both. With the scan costing 93%.

However, the key does not seem to be in this data, as the plans are nearly equavent, with the SQL2005 executing plan looking slightly better (table scan is a larger part of the execution).

How can these differences, espcially of this magnitude, be explained?
And further, how can the query be optimized for decent performance on SQL2005? What am I doing wrong?

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Hi,

I am experiencing some problems accessing an Oracle database through
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When I connect to a SQL Server database it only takes 3.1 ms to open a
connection, while with Oracle it takes 15.5 ms (both DB's running on
the same machine, I made 1000 calls and took the average).
Am I doing something wrong, am I missing something here?
I have tried to use the plain Open method, but in this case it takes
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Is Oracle really that much slower when accessing it through OLE DB?

Thanks for any advice/hints!
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The problem ISN'T NETWORK

using conventional mirroring, the same workload never falls behind, throughput plateaus at ~26Mbs.

it's almost like log stream compression isn't happening for AG...

both mirroring and AG are using async.

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Nov 10, 2014

Following is my db table

student_id student_code student_parent_id student_name
1 11 0 a
2 111 1 b
3 1111 2 c
4 11111 3 d

I want to generate following op

student_id student_code student_parent_id student_name Hierarchy
1 11 0 a 11
2 111 1 b 11-111
3 1111 2 c 11-111-1111
4 11111 3 d 11-111-1111-11111

Following is the query

i want to retrieve around 10000 in one go.. its taking around 8 seconds.. how to make it faster?

even if i retrieve 1 record or 10000 records, its taking around 8 seconds...

--- create table

create table test(sid bigint, scode nvarchar(50), parentid bigint, sname nvarchar(50))

---- insert records

insert into test values (1, '11', 0, 'a')
insert into test values (2, '111', 1, 'b')
insert into test values (3, '1111', 2, 'c')
insert into test values (4, '11111', 3, 'd')

---- result query

;WITH SInfo AS
(
SELECTsId
,scode
,ParentId
,sName
,CONVERT(nvarchar(800), scode) AS Hierarchy

[Code] .....

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The UDF used a while loop and to improve performance, I wrote the equivalent UDF using a tally table. The tally table version actually ran significantly slower. Query calling UDF using cross apply took 26 secsfor the while loop versus 119 secs for Tally table, for test data of 97000 rows

I would like to work out why, as I will use similar code to replace the illegal characters .

-- while loop version of UDF

CREATE FUNCTION [dbo].[DisplayIllegalChars](@strText VARCHAR(4000))
RETURNS @TableVariable TABLE (
Chr CHAR(1)
,AsciiValue INT)
AS
BEGIN
DECLARE @intCount INT
DECLARE @chrCheck CHAR

[Code] .....

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