Index Utilization

Mar 29, 2001

SQL 7 SP2

Hi.

True or false on these:

1. A table has a PK of EmployeeID (non-clustered). The sql statement where clause uses something like "WHERE E.Action > 1 AND E.User = 1001 AND E.EmployeeID = 12345
Question: Will the PK index be used in determining the result set ?

2. A table has an index of EmployeeID + Company + State (clustered). The sql statement where clause is "Where EmployeeID = 1001".
Question: Will the index be used in determining the result set ?


Thanks,

Craig

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Making A Query Have Flexible Index Utilization

Apr 29, 2008

I have one query that looks like this.

DECLARE @propname

SET @propname = NULL -- can be Null or have wild card values

SELECT col1, col2, col3, propertyname FROM testtable where col1 = 1 and col2 = 2 and col3 = 3 and (@propname IS NULL OR propertyname LIKE @propname)

col1, col2, col3 are part of a clustered index

propertyname is a nonclustered index

This is the predicament. If the "@propname is NULL" is first in the OR statement then the query will use the clustered index for finding the record. If I put "@propname is NULL" last then it uses the propertyname index no matter what. So I either get full index scans if NULL is ever used on property names or I get consistent two second long searches on the clustered index. Any way to have the best of both worlds? Or do I have to divide up my query into more stored procedures?

THANKS

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Aug 28, 2001

Hi,
Does anyone have any good tips for reducing the amount of disk space required for new clustered index creation.

I have just finished building a rather large table (48gbs) and durring the clustered index creation I came very close to running out of disk space.

What I am already doing:
1.Recovery Model simple
2. index padding 0
3. fillfactor 0


Any help would be appreciated
daLoonster

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Oct 20, 2006

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Jul 16, 2001

Hi All,
We have two production boxes running different ERP Apps on each boxes, We just added 2 more cpu's to one box and 1 cpu to other. The Currect CPUS config as stands is

Box 1 = 4 CPU's
Box 2 = 2 CPU's

My boss whats some stats to see if performace was any better and if yes how much !!

How can i find such information from my box ?

Can anyonw help with this stat's ? !!

Thanks in advance

Girish

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May 2, 2005

Hi all,
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Any help would be nice.
thanks
Andrew

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Feb 12, 2004

Hi All,

I want to keep track of the CPU utilization & number of users connected for each database on our production box. I chose to get the data from sysprocesses table from master database.

But I realised that for some reason the master..sysprocesses.CPU column stays static or just keeps on adding to existing values.

Is there any ways thru which I can clear this data ( cpu column in sysprocesses table) after I have captured it in a table ?

Any help is appreciated.

Thanks.

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Jul 20, 2005

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Are there any links that can help troubleshoot this problem?

Thank you.
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Thanks, Christel

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Sep 5, 2002

I am getting high CPU utilization on the SQL Server process (>90%).
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Can someone explain why this is happening. The server is a quad; the SQL server process seems to be using only two CPUs at a time (not the same ones all the time).

Lightweitht pooling has been turned on and the maximum worker thread size has been left at the default value (255).

How can I configure SQL options to spread the load across all four CPUs ??????

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Sep 6, 2006

I have windows 2003 server with SQL Server installed on it for live calls billing but the CPU utilization is reaching the maximam and it's average above 60% which is causing lot of problems specially for the live environment. I have enough memory and free hard disk space is more than 40GB,

so where is the problem?!

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Jul 20, 2005

What do people think is normal for memory utilization? I know that's toobroad, so here are some basics.MS SQL Server 2000, Windows 2000 Server, 2GB RAMDb 1, size = 2.0 GBDb 2, size = 300MBDb 3, size = 50MBDb 4, size = 30MBDb 5, size = 30MBTypically 4-6 users, moderate usage 8-hrs/day. Performance has not slowed.Reboot on Sunday. sqlservr.exe in the Task Manager reports the followingSun 61MBMon 200MBTues 800MBWed 1,124MBThu 1,424MBFri 1,303MBI was getting srv 2020 errors when I had just 1 GB RAM: "The server wasunable to allocate from the system paged pool because the pool was empty."Then I did several updates to address this and got more RAM. I haven't seenthe errors since, but I haven't waited for them to happen: I'm rebootingevery week now. The memory numbers make me suspect SQL Server.Scratching my head. Not sure if my problem is gone, and this is normal SQLServer 2000 behavior, or if my problem is still lurking and I've only mutedit a bit.Any thoughts greatly appreciated.Tom

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Sep 6, 2006

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Apr 19, 2007

Dear all,



One of the server is having 2 GB of RAM and task manager is showing 1.87 GB memory in use.

I have to migrate few databases on the same server.

With high IO Operations.

I know server require more RAM, but how can i prove that server needs more RAM ?









Regards

Mohd Sufian

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Oct 17, 2006

Could anyone help me in finding out why the cpu utilization is very high??

I have two servers say, Server A , server B. There is a transactional replication going on from server A to B

There is a table say Table A on server A, which is being replicated to server B.

I created a trigger insert and update trigger on Table A on server B (i.e. on subscriber). Since then, the CPU utilization for server B is very high 80-90%

when i used profiler, i could see .whenever replication stored proc for insert or update executes..cpu utilization goes up..

trigger just insert the updated/inserted rows into some other table.

Could anyone tell me why the cpu utilization has gone up so much?? i am using sql server 2005

thanx





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Jun 3, 2008

Hi

Please let me know which DMV is best to cpature total system CPU utilization. There are plenty of views so i am a lil bit confused



thanks in advance,

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Sep 27, 2001

I have a few in house developed application (VB based) that access the SQL server for adding, appending , creating tables. The application does the changes thru queries dynamically generated at the application level.

My MS SQL Server runs on a PIII / 256 MB Ram / 18 GB HDD

The problem is that the memory utilization of SQL server keeps growing constantly. Out of 512 MB (256 Physical + 256 Virtual) available teh memory utilization reaches a level of 490 MB and statys constant. Though SQL Server shows a utilization of 150 MB.

I suspect that SQL is not releasing memory back to the system. Please help in resolving. The problem may lie at the applications developed.

Jdindian

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Jun 13, 2007

Is it possible to know the processor utilization and memory usage of a single database in a SQL server?

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Aug 1, 2006

I created an indexed view in SQL 2000, and I expected to see the index created on the view referenced in the execution plan when I query the view. Instead, I see the index for the base table referenced in the execution plan. Why?

There are 6,000,000+ records in the base table, and the view only references 256 of these rows.

Here is some of the DDL if you need it:

CREATE TABLE [alarm_t] (
[ct_dtm] [datetime] NOT NULL ,
[dst_flg] [char] (3) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[stn_nm] [varchar] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[alarm_txt] [varchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[utc_dtm] [datetime] NOT NULL ,
[create_utc_dtm] [datetime] NOT NULL
) ON [PRIMARY]
GO

CREATE CLUSTERED INDEX [alarm_idx2] ON [dbo].[alarm_t]([ct_dtm], [stn_nm], [dst_flg]) ON [PRIMARY]
GO

create view dbo.alarm_Mapbd_v with schemabinding
as
SELECT
[ct_dtm],
[dst_flg],
[stn_nm],
[alarm_txt],
[utc_dtm],
[create_utc_dtm]
FROM [dbo].[alarm_t]
WHERE[stn_nm]= 'Mapbd'
GO

create unique clustered index alarm_Mapbd_idx1 on dbo.alarm_Mapbd_v
( stn_nm, ct_dtm, dst_flg )
go

update statistics alarm_t
go
update statistics alarm_Mapbd_v
go

The following 2 queries have the exact same execution plan, both showing a cost of 50%. I expected to see the index created on the view referenced in the execution plan for the first query. Is the index created on the view being used?

selectstn_nm, ct_dtm, dst_flg
fromalarm_Mapbd_v
go
SELECT
[ct_dtm],
[dst_flg],
[stn_nm],
[alarm_txt],
[utc_dtm],
[create_utc_dtm]
FROM [dbo].[alarm_t]
WHERE[stn_nm]= 'Mapbd'
go

Thanks for your assistance.

Tom

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Jan 30, 2004

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Right now I can produce this by executing two very similar T-SQL selects. The one that runs on the server only has one additional join - a very simply join at that. If I can change my SQL to make it run client side in some situations, that would be VERY HELPFUL!

Thanks in advance!

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Feb 12, 2007

Environment: Win2003 SP1, 32 bit, SQL Server 2K5

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Canada DBA

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Sep 20, 2007

I have a data mining app that does a series of select statements (no inserts). I'm noticing an odd occurance where if I start up 4 copies of the app on a quad core machine - sql takes full advantage of the 4 cores for a few minutes and then drops to 75% utilization - the other 25% is on the idle process. Two of the apps appear to be sharing a single proc of sql as each of their throughputs is cut by 50%. If I then start a 5th copy of the app, the machine is brought to full 100% utilization - two of the apps continue to appear to share a proc. SQL is set up to use all procs and I have even tried select the priority boost to no effect.

Any ideas how to ensure full sql utilization with the same number of apps as cores?

thanks,

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Jan 2, 2007

Happy New Year everyone!I would like to capture CPU Utilization % using TSQL. I know this canbe done using PerfMon but I would like to run TSQL command (maybe onceevery 5 minutes) and see what is the CPU Utilization at that instant sothat I can insert the value in a table and run reports based on thedata.I have spent a good amount of time scouring google groups but this isall I have found:SELECT(CAST(@@CPU_BUSY AS float)* @@TIMETICKS/ 10000.00/ CAST(DATEDIFF (s, SP2.Login_Time, GETDATE()) AS float)) ASCPUBusyPctFROMmaster..SysProcesses AS SP2WHERESP2.Cmd = 'LAZY WRITER'Problem is this gives me total amount of time CPU in %) has been busysince the server last started. What I want is the % for the instant -the same number we see in Task Manager and PerfMon.Any help would be appreciated.Thanks

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Aug 3, 2007

Hello

I created a table with column name "description" as varchar(8000). My doubt is if I am not storing 8000 characters in this column, will SQL Server use memory space needed for 8000 characters ? or will it use only the space that needs for my text. ?

Thanking You
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Nov 27, 2007



I'm having a problem with one of my SQL servers (2000 Build 8.00.2140) where it is always reading CPU utilization of 70-100% (more often pegged at 100%).

I have an exact same SQL server running at a different location on a much less powerful (hardware wise) server that gets more traffic but only shows 7-21% CPU utilization.


Taskmgr shows Process sqlservr.exe as consuming all the resources. This is a dual 2 core 3.66Ghz (4 real CPUs) with 4GB RAM and 5 x 146 15K SCSI drives hooked up to a $1200 SCSI contoller (Dell server). RAM usage is pretty low, most I've seen is 1GB.


Is there any way to determine what specific connection/thread is causing this? Any diagnostic tools or anything that can show me specifically what is consuming this SQL server? Connection thread or anything that points back to a specific IP?

Thanks, Rob.

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May 30, 2014

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Jan 16, 2007

HI
I am facing a strange problem with SQL Server 2005 . The CPU utilization with SQL Server 2005 is higer by about 70% comapared to SQL 2000.

In the same kind of Hardware and with the DB server up , I performed the following tests
Declare @i int
Set @i = 10
While @i < 100000
Begin
Insert into arup_emp values(@i,'M',0)

Set @i = @i + 1
end


The CPU utilization average on SQL 2005 was 45% and on SQL 2K it was just 25% , I am seeing a lot of people who seems to be facing this problem but unfortunately not seeing any solution to this.

Can anyone through some light .
Please note that I have tried to also see the MAXDOP options, but get the same results.

Please help.

Thanks
Arup

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Aug 29, 2007

I was tuning a query testing out SARG with these two queries:

select col1 from table1 (nolock) where col1 like '#,%ABC%' or col1 like 'BC,%ABC%'
select col1 from table1 (nolock) where col1 like '%ABC%'

I flushed out the cache, added an index to col1, then ran those two together. Provided below are the actual query plan and stat time:

Query 1: Query cost (relative to the batch): 0%
select col1 from table1 (nolock) where col1 like '#,%ABC%' or col1 like 'BC,%ABC%'
----------------------------------------------------------------------------------------------------------------------------
SELECT Index Seek
Cost:0% <------- [DB1].[dbo].[table1].[Idx..]

Cost: 100%


Query 2: Query cost (relative to the batch): 100%
select col1 from table1 (nolock) where col1 like '%ABC%'
----------------------------------------------------------------------------------------------------------------------------
SELECT Index Scan
Cost:0% <------- [DB1].[dbo].[table1].[Idx..]

Cost: 100%

------------------------------------------------STAT TIME-----------------------------------------------------------
SQL Server parse and compile time:
CPU time = 0 ms, elapsed time = 1 ms.

SQL Server Execution Times:
CPU time = 0 ms, elapsed time = 1 ms.
SQL Server parse and compile time:
CPU time = 0 ms, elapsed time = 7 ms.

(3 row(s) affected)
Table 'table1'. Scan count 2, logical reads 2932, physical reads 0, read-ahead reads 18, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

(1 row(s) affected)

SQL Server Execution Times:
CPU time = 938 ms, elapsed time = 943 ms.

(3 row(s) affected)
Table 'table1'. Scan count 1, logical reads 2927, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

(1 row(s) affected)

SQL Server Execution Times:
CPU time = 515 ms, elapsed time = 505 ms.
SQL Server parse and compile time:
CPU time = 0 ms, elapsed time = 1 ms.

SQL Server Execution Times:
CPU time = 0 ms, elapsed time = 1 ms.

------------------------------------------------STAT TIME-----------------------------------------------------------

As expected, SARGable Query 1 did a nonclustered index seek and nonSARGable Query 2 did an index scan instead. According to the query plan, Query 1 consumed 0% relative to the batch whereas Query 2 is 100%. When I checked the CPU time, I was a bit confused because Query 1 showed CPU time of 938ms whereas Query 2 showed 515ms. I triple checked and every time I got similar results. I am sure I'm missing something, could someone please tell me what I'm missing? Thanks a bunch!

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Oct 21, 2007

Our company recently combined our DBs into one SQL 2005 Server.

Dell Power Edge 1800 with 3.00 GHz Xeon Processor 800 FSB, 1 GB of RAM
Dell Power Edge 1600 with 2.80 GHz Xeon Processor 533 FSB, 1 GB of RAM

Combined into one:
Dell Power Edge 2950 Dual Core 1.6 GHz Xeon Woodcrest Processor, 4 GB of RAM


However, the CPU utilization on this new server is maintaining at about 90% with 3.82 GB of RAM used as well. It's a Windows Server 2003 R2 x64 edition running SQL Server 2005 SP2 x64. I have searched around Microsoft's website for any information that could be of help to me, but I was unable to locate anything. I was hoping that someone could provide some insight as to why this might be occuring. Or if this is a known issue.

Thanks,
Peter

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Kindly provide me suitale solution.

Srinath
DBA
Reid & Taylor
Mysore, India

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Hi,

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Has anyone experienced this kind of a behaviour?

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PK



















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