Aug 21, 1998

I have Problem, My response time is too Low. Is Any one Know how to improve my response time. My DATABASE SIZE IS 11 GB. I didnt change any configuration parameter after installing SQL Server. Right my server Having default configuration parameters. Whether I have to change any parameters or not. My queries will generate lot of temporary tables.



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Slow Response Time After Converting DB From SQL 6.5 To 7.0

Feb 10, 2000

We did an in place convertion of our data base from MS SQL Server 6.5 to 7.0.
Our application is much slower now on SQL 7.0. Any idea why?
The following is a sample SQL statement that runs quickly on SQL 6.5 and takes a long time on SQL 7.0 I also attached the query plans from SQL 6.5 and 7.0.

SELECT Person_Name.PerNam_Person_Name_PK ,
Person_Name.PerNam_Row_Status ,
Person_Name.PerNam_Last_Name_Sndx ,
Person_Name.PerNam_Last_Name ,
Person_Name.PerNam_Name_Suffix ,
Person_Name.PerNam_First_Name ,
Person_Name.PerNam_Name_Prefix ,
Person_Name.PerNam_Middle_Name ,
Person_Name.PerNam_Event_Person_FK ,
Event.Evn_Event_Nbr ,
Event.Evn_Event_Type ,
Event_Person.EvnPer_Last_Name ,
Event_Person.EvnPer_First_Name ,
Event_Person.EvnPer_Middle_Name ,
Event_Person.EvnPer_Name_Prefix ,
FROM Person_Name , Event , Event_Person
WHERE (Person_Name.PerNam_Agency_ID = "CL")
AND ( Person_Name.PerNam_Event_Person_FK = Event_Person.EvnPer_Event_Person_PK )
and ( Event_Person.EvnPer_Event_FK = Event.Evn_Event_PK )
and (Person_Name.PerNam_Person_Name_PK = 0 or ( Person_Name.PerNam_Event_Person_FK = 581541) )
and ( Person_Name.PerNam_Row_Status <> "D" )

Query plan in SQL 6.5

SQL Server Execution Times:
cpu time = 0 ms. elapsed time = 31250 ms.
The type of query is INSERT
The update mode is direct
Worktable created for REFORMATTING
Nested iteration
Index : PK_Person_Name
Nested iteration
Index : PerNam_Event_Person_FK
Nested iteration
Using Dynamic Index
Nested iteration
Index : PK_Event_Person
Worktable 1
The type of query is SELECT
Worktable 1
Nested iteration
Table Scan
Nested iteration
Index : PK_Event
SQL Server Parse and Compile Time:
cpu time = 0 ms.
Table: Person_Name scan count 2, logical reads: 6, physical reads: 5, read ahead reads: 0
Table: Event scan count 0, logical reads: 0, physical reads: 0, read ahead reads: 0
Table: Event_Person scan count 0, logical reads: 0, physical reads: 0, read ahead reads: 0
Table: Worktable scan count 0, logical reads: 0, physical reads: 0, read ahead reads: 0
Table: Worktable scan count 1, logical reads: 1, physical reads: 0, read ahead reads: 0

SQL Server Execution Times:
cpu time = 0 ms. elapsed time = 62 ms.

Query plan on SQL 7.0

SQL Server parse and compile time:
CPU time = 431 ms, elapsed time = 535 ms.
Table 'Event'. Scan count 1, logical reads 3, physical reads 3, read-ahead reads 0.
Table 'Event_Person'. Scan count 1, logical reads 6, physical reads 5, read-ahead reads 0.
Table 'Person_Name'. Scan count 1, logical reads 4588, physical reads 2, read-ahead reads 4092.

SQL Server Execution Times:
CPU time = 7921 ms, elapsed time = 13519 ms.

SQL Server Execution Times:
CPU time = 0 ms, elapsed time = 13781 ms.

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Every insert-select takes 200 ms when it receives the first data (including some other operations that are not increasing the response time), and 200 insertions later it takes about 500 ms, which is really too much, considering it keeps increasing.

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I make the select using 4 columns in the where part. One of them is a numeric, and the rest are varchar (no one is the primary key).

I've got a clustered index for the primary key, and two more non-clustered indexes. One of them refers to the columns I use in the Select, and the parameters are Fill Factor: 90, and Recompute Statistics Automatically.

I hope I explained properly...

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Oct 27, 1998

We have an application that has about 100 users at a time. Roughly once a day, we experience a complete
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Jun 11, 2007

Hi, I have a query which returns normally in less than a couple of seconds. When coupled with a "TOP" statement however, the execution time changes in a way I can't explain.

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As far as we can see, there is nothing odd about this query or the data that it is searching, and this problem has us stumped! Can anyone explain why top is producing these results, and is there any optomisation changes that anyone can suggest to give us faster queries in these cases?

Many thanks, Andy J.

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Nov 14, 2007

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2 try
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5 OleDbConnection connection = new OleDbConnection(dbConn);
7 lbl_SearchResult.Text = dbConn;
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