High Disk I/o

Aug 14, 2002

Hello,

We are experiencing high disk i/o on one of our RAID disk systems. Can someone tell me how I can identify the query or user or process which is causing this high disk i/o?

Thanks,
Brent.

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SQL Server Freezes : Consumes High Disk Space

Dec 19, 2005

Hi,

The SQL Server Database hangs overnight and also consumes high disk space on one of our servers. This has been recurring for quite a few weeks and occurs daily.

Can somebody assist me in trouble-shooting the same

Thanks in Advance
Deepak

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High Disk Write Bytes/sec In Mirror Server

Oct 4, 2006

I have do some benchmark test between the "Principle", "Mirror" and "Witness", things seems normal, the System usage (CPU, Disk Read/Write) on the "Witness" is very small and the CPU usage on Principle and Mirror is similar, However....

For the "Disk Write Bytes/sec", the usage on Principle is 200,000 and the Mirror is 1,500,000, the mirror server is talking about x7 times Disk Write Bytes/sec on the Mirror.

I cannot think of any reason why the Disk Write Bytes /sec is so much higher than the Principle, can somebody help me?

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Is It Possible To Move My Sql 2000 Database (in C Disk) To Another Disk (Disk) ?

Dec 28, 2006

hello,all
          I am new to Sql 2000,I installed sql 2000 database in C disk,but Now I found my C disk space is smaller than before,So I want to move my databse(include data and structure)   from C Disk to D Disk(its space is very large) .
         is it possible to do it ? 
         if its can be done ,do I need to change my asp.net program source code (exp: chaneg my crystal  report connectstring ) ?
        thanks in advanced!
 
 
 
      

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High Availability To High Protection Without Reconfiguring Mirroring

Apr 23, 2007

Hi,

Is there a way to configure mirroring to go from High Availability to High Protection without having to reconfigure Database Mirroring? Using the interface in Management Studio, I can change the configuration option to High Performance, but not High Protection despite both of them being Synchronous.

If not, what are the recommended steps to configure the mirror once it already has been configured? Is just like initially setting up the mirror or would there be any shortcuts I could take? If I stop the mirroring and remove the witness, will the High Protection option be available?

Thanks,
J.

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High Safety Changed To High Performance After Fail Over ?

Mar 6, 2008

Hi There

I realise this is a stupid quesiton but i cannot really find any confirmation of this in BOL.


If you are running High Safety with automatic failover, when failover occurs does this automatically change to High Performance mode. SInce for failover to occur something has happen with the primary , it will be impossible to commit transactions on the new primary and mirror asyncronously since 1 of them is no longer available.


So am i correct in assuming that automatic failover also automatically changes the mode to High Performacne for that session?

Thanx

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Calculating COUNTER Physical Disk: AVG. DISK QUEUE LENGTH

Sep 10, 2007

If I return the Average, Minimum, and Maximum values for the counter Physical Disk: Avg. Disk Queue Length, and those values are 10, 0, 87 respectively, which value do I use to compute the Avg. Disk Queue Length for a 4 disk array(RAID 10): Average, Minimum, or Maximum? The disk(lun) is on a SAN.

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Get Total Disk Size And Free Disk Space

Nov 13, 2007

-- Initialize Control Mechanism
DECLARE@Drive TINYINT,
@SQL VARCHAR(100)

SET@Drive = 97

-- Setup Staging Area
DECLARE@Drives TABLE
(
Drive CHAR(1),
Info VARCHAR(80)
)

WHILE @Drive <= 122
BEGIN
SET@SQL = 'EXEC XP_CMDSHELL ''fsutil volume diskfree ' + CHAR(@Drive) + ':'''

INSERT@Drives
(
Info
)
EXEC(@SQL)

UPDATE@Drives
SETDrive = CHAR(@Drive)
WHEREDrive IS NULL

SET@Drive = @Drive + 1
END

-- Show the expected output
SELECTDrive,
SUM(CASE WHEN Info LIKE 'Total # of bytes : %' THEN CAST(REPLACE(SUBSTRING(Info, 32, 48), CHAR(13), '') AS BIGINT) ELSE CAST(0 AS BIGINT) END) AS TotalBytes,
SUM(CASE WHEN Info LIKE 'Total # of free bytes : %' THEN CAST(REPLACE(SUBSTRING(Info, 32, 48), CHAR(13), '') AS BIGINT) ELSE CAST(0 AS BIGINT) END) AS FreeBytes,
SUM(CASE WHEN Info LIKE 'Total # of avail free bytes : %' THEN CAST(REPLACE(SUBSTRING(Info, 32, 48), CHAR(13), '') AS BIGINT) ELSE CAST(0 AS BIGINT) END) AS AvailFreeBytes
FROM(
SELECTDrive,
Info
FROM@Drives
WHEREInfo LIKE 'Total # of %'
) AS d
GROUP BYDrive
ORDER BYDrive

E 12°55'05.25"
N 56°04'39.16"

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Nov 15, 2006

Hello,

I am trying to setup a test cluster and am having an issue. When I try to create the resource of a physical disk it takes both the drive e: and drive q: and doesn't seperate them into two physical disks as resources. This means when I try to associate the quorum disk it links the to physcial disk resource of drive e and q. Then when I try to install SQL2k5 I get the warning about installing SQL on the quorum disk. Am I missing something? Is there a way to seperate e and q onto two physical disk resources so I can specifically associate the quorum to q and the sql to e or should I be setting the quorum disk to a majority node set? Thanks in advance.

John

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Feb 20, 2001

Hello,

this is my configuration :

1) 3 disks in RAID5 that hold the SQL data
2) 1 disk in RAID0 that holds the only paging file.

What will happen to the SQL data (DB) when the disk that holds the paging file crashes?

Kindest regards,
Luc.

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May 7, 2004

Hi all,

Ok here goes,

I have a three tier system using SQL server 2000, we are currently experiencing IO bottle necks on our SCSI Raid 10 array, which holds the Data and the logs in separate partitions.

So my options as I understand it are:

Get Enterprise edition

or

Get another physical raid 10 array and separate the logs and data i.e. data on one array and logs on the other array.


I would like to try the latter but I am totally unsure how much difference this will make or whether it will make any difference at all.

Does anyone know how much performance increase I will get from using two arrays as opposed to one?


Any other advice on this scenario would be greatly appreciated.


Thanks

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Jul 21, 2000

I need to use a system-generated key and will have over 2 billion items.
I'm considering using a data type like the following.

Decimal(19,0) will give me the large numbers I need without making my index wider than 9 bytes.

Uniqueidentifier is 16 bytes.

Anyone know if this will cause me pain in the future? Specifically using @@identity after inserts to get the value (i tested it seems OK).


CREATETABLEIdentityTest
(
MyIDDECIMAL (19,0)IDENTITY (1,1),
MyCharchar(1) NOT NULL DEFAULT 'Y'
)


Any ideas welcome.

Dano

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Hello everybody,
We are starting new project
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Log shipping still requre manual intervention ,while goal to switch
between servers automaticly.

Clustering is a last possible solution.

Could someone recomend any other soluion or products?

Thank you

Alex

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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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COLOR=Blue]Hi all,

What can be the reason there is a high CPU usage even when there's only 1 database being accessed. As a result the database is really really slow.
CPUperformance usage goes as high as 100% and I can't for the life of me figure out what's causing it. The indexes are being rebuilt 3/4 times a week and I've checked to make sure there aren't any locks or anything.

Any other ideas? [/COLOR]

Thanks
B.

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Oh yeah, it's SQL Server 2005 and asp code running IIS6 on windows 2003 server.

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

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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..

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thanx





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thanks
david

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Thanx

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