I'm using an application that produce 48000000 reads for one stored procedure and 170 seconds to complete. The same procedure when executed in SQL Analyzer takes only one seconds and 10000 reads.
What is happening here? Where should I look to solve this problem?
Thanks
Hi,
Can any of can explain, what the "Reads" column in Profiler exactly mean ? I'm not comfortable with the explanation given in BOL.
"The number of read operations on the logical disk that are performed by the server on behalf of the event. These read operations include all reads from tables and buffers during the statement's execution"
For the same procedure with same parameters, if the server is not loaded much, the Reads are in a few hundreds, but when there are more than 1000 concurrent users, why it is going to millions ? What other parameters affecting this reads ? And how can I reduce it ?
Environment: SQL Server 2005 64-bit Enterprise Edition on Windows Server 2003 R2 Server x64 Enterprise Edition SP2
Thanks in Advance.
Regards
Babu
I'm running the same query on two different PCs and tracing results in Profiler on my PC. When executing the query on PC1 - the total number of reads is 200000. When executing the same query on PC2 - the toal number of reads is 13000. It is almost 15 times more reads when executing query on PC2. The executed query is same on PC1 and PC2. Any reason for this?
I'm trying to analyse that query and reduce the number of logical reads as it's is too high but then I get completly different result on different PC.
Thanks.
I am running a profiler trace against a database and noticed that thereads column always shows 0. When running the same trace againstanother machine I get back values in the reads column. I took a querythat profiler reported as having 0 reads and ran in in query analyzerwtih STATISTICS IO on and confirmed that there are in fact reads:Table 'tt_cawardalloc'. Scan count 1, logical reads 8, physical reads0, read-ahead reads 1.Table 'tt_clineitem'. Scan count 10, logical reads 125208, physicalreads 1540, read-ahead reads 2995.Table 'tt_contractitem'. Scan count 32, logical reads 676, physicalreads 0, read-ahead reads 0.Table 'tt_contract2'. Scan count 3, logical reads 121, physical reads4, read-ahead reads 0.I am on SQL 2000 sp3a. Any help appreciated.Thanks!
View 8 Replies View RelatedI ran Sql profiler and got the following results for a stored procedure
CPU of 1078;
Reads of 125464
writes of 0
Duration of 1882
how do i interpret the above results.
also what CPU and Duration is considered high and indicating a poor performing query.
I am using SQL Server 2005. Thanks
Is the SQL Server Profiler Reads Column Incorrect For Parallel Plans?
I often use profiler as one tool to identify bad plans. The reads column gives me a good indication of excessive IO to dig into and correct if necessary. I often use it with Showplan so I can see what a query does, replicate it and fix it.
However I have just lost some faith in it. I am looking at a poorly performing query joining five tables. A parallel plan has been generated and one table is being scanned (in parallel) due to a missing index. This table had in excess of 4 million rows in it. The rest hitd indexes well. However the entire query generates ONLY 12 READS.
Once corrected, a single processor plan is used. This looks really efficient and uses 120 reads. That looks the right figure to me.
Does the profiler only display one thread of a parallel plan perhaps? Or something else?
I often use profiler as one tool to identify bad plans. The reads column gives me a good indication of excessive IO to dig into and correct if necessary. I often use it with Showplan so I can see what a query does, replicate it and fix it.
However I have just lost some faith in it. I am looking at a poorly performing query joining five tables. A parallel plan has been generated and one table is being scanned (in parallel) due to a missing index. This table had in excess of 4 million rows in it. The rest hitd indexes well. However the entire query generates ONLY 12 READS.
Once corrected, a single processor plan is used. This looks really efficient and uses 120 reads. That looks the right figure to me.
Clearly 12 reads is wrong. Does the profiler only display one thread of a parallel plan perhaps? Or something else?
I've been looking around for some kind of known issue or something, but can't find anything. Here's what I'm experiencing:
I have a table with about 50,000 rows. I open several connections and use a command to ExecuteResultSet against each command, with CommandType.TableDirect, CommandText set to the name of the table, and IndexName set to various indexes. In the end, I have several SqlCeResultSet instances which are then maintained for the life of the AppDomain.
In a loop, I call SqlCeResultSet.Read() on one of the instances, and if it returns false, I call SqlCeResultSet.ReadFirst() - essentially creating a circular pass through the result set.
In a Visual Studio debug session, this approach goes swimmingly for a short time, and then after a successful Read(), I'm pegged with an InvalidOperationException (text: "No data exists for the row/column") for a column which was succesfully read on the previous Read(). If, in the immediate window, I call SqlCeResultSet.Read() again on the result set instance, the Get___ methods work as they had been in the previous reads.
It seems like the internal state of the ResultSet is getting corrupted somehow, but it is opaque to me. Any insights on why this suddenly throws this exception?
I am writing a performance baseline test.
The first test writes 5000000 rows in one table. I realise this is not representative OLTP behaviour, but it worked me to start interpreting performance counters and to test several setups to be discussed with our server, storage and network administrators. This way we have been able to compare the results of different hard disks, Lun vs vmdk, 1GB vs 10GB network, AMD vs Intel, etc. This way I can also compare several SQL setups (recovery model, max memory config, ...)
The screenshot shows the results of 2 runs on the same server : Win2012R2, SQL2014, 16GB RAM.
In test 1 min/max server memory was set to 9215MB/10751MB
In test 2 min/max server memory was set to 13311MB/14847MB
The script assures the number of bytes inserted in the nvarchar columns is always the same.
This explains why the number of pages and the number of MB in the table are the same at the end of the 2 tests (column 5 and 6)
Since ca 13GB has to be written, the results of test 1 show the lead time is increasing once more than 10GB has been inserted (column 8 and 9) In addition you can see at that moment
- buffer cache hit ratio is decreasing
- page life expectance becomes "terrible"
- free list stall/sec increases
- lazy writes/sec increases
- readlatency increases (write latency does not)
In test 2 (id 3 in column 1 in the screenshot) those counters are not really influenced (since the 5000000 rows can all be stored in memory).
Now what I do not understand is :
Why the number of pages read (instance level) as well as the number of bytes read and the number of reads (databaselevel) is increasing extremely during run 1.
I expected to see serious impact on write behavior, since SQL server is forced to start flushing dirty pages once memory is filled. Well actually you can see here the number of writes (not the the number of bytes written) starts to increase faster in test 1 after 4000000 rows, but there's no real impact on write latency.
Finally I want to notice
- I'm the only user on this machine
- the table has a clustered index on a identity column
- there are no foreign key constraints
- inserts are executed using a loop, not one big transaction
- to monitor progress and behaviour/impact, each 10.000 loops the counters are stored using dmv queries
So I wonder why SQL Server starts to execute so many reads in test 1.
Where - in SQL Server Profiler - can I see the port number that someone has used to connect to a database?
e.g. given the connect string "tcp:MACHINE1INSTANCE7,3045" - where in Profiler does it tell me that the connection is using port 3045? I looked at "audit login" and "existing connection" but I don't see a port number...
Any other SQL/Windows tools that I can use to monitor connections to databases on specific ports?
thanks
Hi everbody,
I want find out Total number records in one table without using select statment.
Some body as told to me there is system table you can find total number of records. Any body give me systable name.
Thanks
Jack
Hi everbody,
I want find out Total number records in one table without using select statment.
Some body as told to me there is system table you can find total number of records. Any body give me systable name.
Thanks
Jack
hi,
I have a person table with a field createdate and personid,
how can I display how many customers existed in the table by date.
eg.
1/4 200
2/4 250
3/4 256
4/4 280
regards,
amie
Hi,
I want to create a web application which will give the information of the total databases in a server or local machine. also I want to know about the number of tables, its properties in each databases. Pls help me.
I want to loop thru all the variables in my package and set number of variables that had variable-name begin w/LOCAL, so I can use the name to generate a dynamic SQL query for the next EXEC SQL Task. any one know how to do this.
Iam using front page to dispalay my results.
At the bottom it shows me 1/10 i.e 1st page of 10 pages.
but what do i do if i want it to be shown as 1-10 out of 100 (if each page contains 10 results).
or it would be really good if i get count of both no. of recors as well as no. of pages.
I am attempting to sum the gas production for each organization number, and separate gas production into each year as such:
Organization_Number20082009201020112012
103 774 7313868470
But currently I am having trouble displaying this, and it's coming out as such:
Organization_NumberMonth20082009201020112012
103 1 774731386847NULL
103 2 810656654674NULL
202 1 27262702293725122048
202 2 2913205120202064NULL
I want to remove the month and have one total per organization number, as well as remove NULL as show as 0.
Code:
select *
from yearproduction
pivot(
sum(Gas_Prod)
for Year in ([2008], [2009], [2010], [2011], [2012]))
as YearlyProduction
order by Organization_Number, Month
HiI'm migrating from Access til MySQL.Works fine so far - but one thing is nearly killing me:I got the count of total records in a variabel - (antalRecords)I got the count for the Field Q1 where the value value is = 'nej'Now I just need to calculate how many % of my records have the value 'nej'I access this worked very fine - but with MySQL ( and ASP) I just cant getit right!!! I go crazy ....My code looks like this :strSQL="SELECT COUNT(Q1) AS Q1_nej FROM Tbl_evaluering " &_"WHERE Q1 = 'NEJ' "set RS = connection.Execute(strSQL)antal_nej = RS("Q1_nej")procent_nej = formatNumber((antal_nej),2)/antalrecords * 100Hope ...praying for help ...Please ;-)best wishes -Otto - Copenhagen
View 3 Replies View RelatedI know how to reset the page numbers with each group, but how do you reset the total page number within each group.
EX. Code for page of total pages
="Page " & Globals.PageNumber & " of " & Globals.TotalPages
EX. Code to reset within a group
Custom Code:
Shared offset as Integer
Shared currentgroup as object
Public Function GetGroupPageNumber(group as Object, pagenumber as Integer) as Object
If not (group = currentgroup)
offset = pagenumber - 1
currentgroup= group
end if
return pagenumber - offset
end function
=Code.GetGroupPageNumber(ReportItems!Category.Value(grouping),Globals!PageNumber)
What I need is code for a combination of the two...to display code for page of total pages that resets within a group.
Any help is greatly appreciated.
Thanks!
Hi,
Im trying to output the number of rows in a table returned in a report, into a textbox for a total record count
How would I do this ?
thanks
number of connectios tcp/ip..........I have a 3 person but the 4 does not connect????
View 1 Replies View RelatedIt's no secret that the number of pages in a rendered report varies depending on the format. I have no problem getting the total number of pages for reports rendered in image formats from the web service, but I can't figure out how to get the number of pages for reports rendered in HTML.
I've always been under the impression that the Report Manager that ships with SSRS uses the same web service (reportservice.asmx) and IT can get the number of HTML pages, so it has to be possible.
Does anyone know how to do it?
Hi everyone,Does exist an easy way to count the actually number of queries executed within a page?I've searched here and in google but found anything...Thanks in advance!
View 3 Replies View RelatedCopy and paste the code to review sample:
Create table #temp(
ID varchar (20),
ID_BegAttach varchar (20),
ID_EndAttach varchar (20),
ID_AttachLvl varchar (20),
ID_NumofAttach varchar (20)
[Code] ...
I'd like to get the column ID_NumofAttach to be populated by the total number of ID_Attachlevel column by the same ID_BegAttach or ID_EndAttach and populate where ID_Attachlevel is 0.
I am currently working on a T-Sql query(Sql server 2008) to calculate total no of days between date ranges by year
Table:
Start Date End Date
01/01/2013 04/30/2014
11/01/2014 05/31/2015
06/01/2015 12/31/2015
My expected result.
2013 - 365
2014 - 181
2015 - 365
Note:
Date range can span b/w multiple years
Date ranges will not overlap
I just want the total number of days covered by the range for each year.
Is there any simple way to do this calculation.
How can i get the total number of each distinct value in the column and write it to another table e.g.
MyTable
Id Fruit
1 Apple
2 Banana
3 Apple
4 Watermelon
5 Banana
6 Watermelon
7 Apple
Result
Fruit Count
Apple 3
Banana 2
Watermelon 2
my table includes detailed records with total Rate repeated in each record:
CREATE TABLE Table1
(
Providerid varchar (6) NOT NULL,
Providername char (30) NOT NULL,
Clientid varchar (15) NOT NULL,
[code]....
I am trying to create a script file that will get me the total number of orders in july. How exactly would i say july because i know my syntax is wrong and I would be using sum instead of count right?
What i tried
use Cis11101_Northwind
Declare @Julycount int
Set @Julycount= (Select sum(*) From orders Where OrderDate = 'july')
print 'The total orders for july is ' + Cast(@JulyCount as varchar)
which is the most efficient query to find out the total number of rows in a table other than using - SELECT COUNT(*) ... in query
View 10 Replies View RelatedHi,
I have requirement to display Total number of Rows in a Report in Page Header.
I have written the following code in Page header it shows RowCount for the Page only.
=Count(ReportItems!textboxInTableCell.Value)
Can anyone please help on this?
Regards
Raghav
I have a transformation where final result set give me 25 rows of data. Now before I put into destination table, I need to add another column which will show how many total records we have. Like.
My dataset:
A 20 abc
B 24 mnp
c 44 apq
Now I need to add another column within my transformation before I store the result set to destination like this:
A 20 abc 3
b 24 mnp 3
c 44 apq 3
Here. new column gives count of total rows in our dataset which was 3.
How can I achieve this? Can I use derive column to this?
If I just use a simple select statement, I find that I have 8286 records within a specified date range.
If I use the select statement to pull records that were created from 5pm and later and then add it to another select statement with records created before 5pm, I get a different count: 7521 + 756 = 8277
Is there something I am doing incorrectly in the following sql?
DECLARE @startdate date = '03-06-2015'
DECLARE @enddate date = '10-31-2015'
DECLARE @afterTime time = '17:00'
SELECT
General_Count = (SELECT COUNT(*) as General FROM Unidata.CrumsTicket ct
[Code] ....
Does anyone know how I can determine the number of page writes that have been performed during a set period of time? I need to figure out the data churn in that time period.
TIA