SQL 2012 :: Anyway To Check If Server Is Having Disk Latency
Oct 1, 2014
Is there anyway to check if server is having disk latency or IO issues?Found below in SQL error log
Date10/1/2014 8:28:58 AM
LogSQL Server (Current - 10/1/2014 12:00:00 AM)
Sourcespid10s
Message
SQL Server has encountered 8500 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [D:Fin.mdf] in database [Fin] (5). The OS file handle is 0x0000000000001368. The offset of the latest long I/O is: 0x0001104a7da000
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May 25, 2004
Hi Everybody,
Can anybody tell me how to get the number of commands delivered per minute in case of Merge Replication with Publisher and subscribers.
This way, we can be sure that even if there is a latency (due to high volume transaction processing), replication is in good shape and things will catch up soon.
Also if there are any other similar measures which can be monitored to make sure that replication is going on fine, it would be great
Please let me know If anyone has got information on same.
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Jul 16, 2004
Here is one of the MCDBA exam question.
Does anyone explain how to do the following?
I click new alert, and selected 'Sql server performance condition alert' Type
But I don't know which object and counter I should choose to get disk space left.
Thank you..
Q: You are the administrator of Microsoft Windows 2000 Advanced Server computer. The server is also
running SQL Server 2000 and contains a database named Sales. The server is configured as shown in
the exhibit.
The sales database is configured by using the default options and increases by 50MB per day. You
want an operator to be notified automatically before the database runs out of disk space. You also
want to minimize the amount of administrative overhead necessary for this database.
What should you do?
A:
Configure systems monitor to log an alert if the hard disk database contains less than 600MB of disk
space. Configure SQL server agent to send an e-mail message notifying the operator of the system
monitor alert.
Explanation: The solution with least administrative effort is to set up a system monitor alert to log when
disk space is below a certain threshold, here 600MB. Then configure the SQL Server agent to trap this event
and send an e-mail notifying the operator when this occurs.
Note: Using SQL Server Agent, you can define alerts and configure responses to alerts.
SQL Server Agent monitors the Windows application log and compares each SQL Server event logged with
the alerts that have been defined. If a match is found, an event alert fires. SQL Server Agent can also
monitor specific SQL Server performance object counters and fire a performance condition alert when the
value for the counter is less than, equal to, or greater than a defined threshold. The Create Alert Wizard can
be used to configure the SQL Server agent for alerts.
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Apr 16, 2015
We have repartioned a server (create a larger C-drive/system partition). It's about Windows Server 2003. Before repartioning SP2 was not installed. After repartioning checkdisk started automatically (as normal after using a disk partitioning tool). Checkdisk did some interesting and bad things with my files: changing file permissions and make some files corrupt, how I don't know. Something to do with SP2 not installed and the NTFS filesystem. After this action I have a corrupted SQL database. Tried to repair with the DBCC CHECKDB repair commands, but fail. Error in event viewer:
Error: 823, Severity: 24, State: 2
I/O error (bad page ID) detected during read at offset 0x0000003bdc4000 in file 'D:program filesMicrosoft SQL ServerMSSQLData352.MDF'.
I also still have NTFS errors in my event viewer. What to do? How can I repair the database? Only running checkdisk again? (and will this work?) Than all file security will be reset to Administrators.
Other ways to rebuild my database? (tools???) Unfortunally there isn't a good backup available due to a lack of good configuration of the backup software.
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May 16, 2014
Table Temporary (Staging) - 400.000 rows and 200 columns.
When i done insert from temporary table to target, i have this:
Msg 8152, Level 16, State 13, Line 9
String or binary data would be truncated.
The statement has been terminated.
How can i check which row/column truncated?
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Jun 23, 2015
I have a job I want to run everyday but before this job starts and I want to check and see if another job has completed before I start this job. i would like to do this in the job steps in SSMS. step 1 is job 'xxxxxxx' running if no go to step 2 if yes exit
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Apr 21, 2014
I have a table called SrcReg which is having a column name called IsSortSeqNo smallint. I am mapping this column in SSIS and the problem comes when I try to execute against different database which has this table but the column name as ISSortSeqNo. I mean both databases having same name but one with upper case. So SSIS fails executing due to meta validation issue.Is there any way to check whether the column name is in small case or upper case through query?
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Jun 25, 2015
I am looking for the best way to check to see if any columns are still NULL in a record. I have a form that gets filled out by users and the values entered into TableA. There are 6 columns in the table, 5 are responses and column6 indicates if the record is complete. So I want a way to see if all of the first 5 columns are NOT NULL and, if so, mark column6 with a 1.
I am thinking this would be a good thing for a trigger on INSERT or UPDATE to check to see if the first 5 columns are filled in and then mark the record as complete.
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Jul 17, 2015
I have a table with a column Capacity which is char(10) and gets populated from user files. I want to check records which have negative Capacity value. So i first checked if its numeric and then for negative.
select * from table WHERE ISNUMERIC(LTRIM(RTRIM(Capacity))) = 1 AND Capacity < 0
BUT still it checks for char fields too giving errors like - Conversion failed when converting the varchar value 'asdf ' to data type int.
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Aug 14, 2015
I have a database In Recovery.
Where do I check the completion status of the recovery?
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Dec 6, 2013
I know how to check for a sinle vlaue but how do I chekc to see if multiple values exist. I need to check for certain email addresses from a list that I have.
Let us say I ahve 3 email addresses, I want to check for all of them in a table and for eevery email address that is present I want to print something like "You email address is XXX" and if one of those 3 is not found my results should look like
"You email address is XXX"
YYYYY not found
"You email address is ZZZZ"
I'm attaching some TSQL that I tried on [AdventureWorks2012].[Person].[EmailAddress]
/****** Select ALL if where an email address is present in the list ******/
SELECT EmailAddressID,EmailAddress
FROM [AdventureWorks2012].[Person].[EmailAddress]
WHERE EmailAddress IN
(
'ken0@adventure-works.com', --1
'terri0@adventure-works.com', --2
[Code] ....
-- Test to see if a single email address is present
IF EXISTS
(
SELECT EmailAddress FROM [AdventureWorks2012].[Person].[EmailAddress]
WHERE EmailAddress IN ('25rob0@adventure-works.com')
)
BEGIN
SELECT 'Email address is presnt'
[Code] ....
When I check multiples using EXISTS it works as per its design and says YES even if a single item is present.
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Oct 12, 2015
I want to join 2 tables, table a and table b where b is a lookup table by left outer join. my question is how can i generate a flag that show whether match or not match the join condition ?
**The lookup table b for column id and country are always not null values, and both of them are the keys to join table a. This is because same id and country can have multiples rows in table a due to update date and posting date fields.
example table a
id country area
1 China Asia
2 Thailand Asia
3 Jamaica SouthAmerica
4 Japan Asia
example table b
id country area
1 China Asia
2 Thailand SouthEastAsia
3 Jamaica SouthAmerica
5 USA America
Expected output
id country area Match
1 China Asia Y
2 Thailand SouthEastAsia Y
3 Jamaica SouthAmerica Y
4 Japan Asia N
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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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May 14, 2014
I have the following:
(a) One Dynamic SQL Query that takes 37 ms when run as a single query or in an SP.
(b) Three SQL Indexed View queries that take 0 ms when run together.
When i add (a) + (b) in the same SP, i should get 37 ms + 0 ms = 37ms, but NO it takes 400 ms.
What is causing the extra 363 ms of latency.
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Oct 15, 2007
Hello,I'm an absolute newbie when it comes to SQL. I was told that SQLserver does not function well on a WAN where network latency between,say, the SQL server and a front-end server is greater than 250ms.I can't find anything information supporting this claim online, so Iwas hoping someone here could tell me if this is true or not?Thank You!!
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Oct 18, 2007
I am looking into various options to improve latency of our application (we figured the latency is mainly because data persistence - writes and reads from DB). I am looking into In-Memory databases also. But, before making that decision (of using in memory databases), I would like to see if there is a way to configure SQL Server 2005 to get as close performance as in-memory databases?
My question:
1. Is there a way that I can configure SQL Server 2005 to use a CACHE that gets loaded as needed basis, so that future database reads/writes will happen to the cache as opposed to disk (db writes)?
2. Is SQL Server 2005 recoverable in such configurations?
3. Are there any ideas/resources where I can get more details? (Such as sample configurations with bench mark numbers, rpevious experiences..etc)
Thanks
Murthy
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Jul 31, 2014
We have a couple of 200GB databases that are recreated each night on a SQL2012 server connected to a disk array. The SQL disk is an auto-tiered combo of 10k and 7k drives in a RAID1 lun, and both data and log files are there.
Recently, some room has opened up on an older array that contains smaller, but many, 15k drives that I could use in a RAID1 config. Being that I'd like to split up the mdf and ldf files, which would you put onto the new (faster) disk?
EDIT: Add'l info: the only current performance issues I see in the SQL Log are FlushCache messages occuring throughout the night, when all activity happens for this DB. Things like this: "FlushCache: cleaned up 388690 bufs with 23474 writes in 409743 ms (avoided 179747 new dirty bufs) for db 47:0"
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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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Jan 28, 2015
I am trying to use change data capture to load the data into the secondtable from table 1 which is coming from UI.
What will be the minimum latency??? Can we use incase of latency less than 5 seconds.
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Feb 5, 2015
During investigation problem with disk i found some issue, that every 2 minutes is writing on disk , it looks like to mdf file of database, but in almost 6-8milions Bytes / sec , it is about 1-2 sec , but every 2minutes... this is normal behaviour ? this is synchonyous writing to disk from memory.
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Nov 21, 2014
We can find free space on disks with 'xp_fixeddrives'.
I need script to find all disk size(total sizecapacity) in the servers?
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Jun 22, 2015
We're having some issues with where our backups write to, so I've been watching and monitoring the performance, when I noticed today that restore labelonly from disk has been running almost non stop for the past few hours.
The account running the query is the SQL Server's service account, and the program is "Microsoft SQL Server".
Every minute or so the SPID changes which made me think it was related to the transaction logs, the "restore labelonly" runs for as long as each database in the transaction log backup.
Example: Database A transaction log backup takes 1 minute and the SPID XX for restore labelonly runs 1 minute
Database B transaction log backup starts and there is a new SPID for restore labelonly.
I hope this makes sense because I normally don't see this restore labelonly running.
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Jun 20, 2015
I have a windows 2012 cluster environment that consists of two SQL servers nodes with Quorum disk configured as witness.
Manual failover between nodes is working fine, however the sql instance virtual is not seeing the Quorum disk.
Moreover the Quorum disk has the same number as another cluster storage disk, is that considered a problem?
When I move the SQL instance from a node to anohter, should the Quorum Disk change ownership as well to that destination node ? if it is not changing ownership what would be the problem??
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Apr 27, 2015
How you would calculate the average read/write latency experienced by a SQL Server instance during a specific time window in order to monitor this for multiple instances. From this MSDN blog, I know that you have to take multiple samples and do some calculations to get the correct latency.
[URL] ...
However, the SQLServer:Resource Pool Stats object tracks these numbers per resource pool and we want to get one number for the whole server. Since there can be a different base value for each resource pool, you can't simply sum the numerator values together. Here's some sample data from a server that illustrates the problem.
object_name counter_name instance_name cntr_value cntr_type
SQLServer:Resource Pool Stats Avg Disk Read IO (ms) default 307318919 1073874176
SQLServer:Resource Pool Stats Avg Disk Read IO (ms) Base default 25546724 1073939712
SQLServer:Resource Pool Stats Avg Disk Read IO (ms) internal 2045730 1073874176
SQLServer:Resource Pool Stats Avg Disk Read IO (ms) Base internal 208270 1073939712
I'm thinking I would need to do some sort of weighted average, but I'm not sure if that will result in the correct value. Here's the formula I am thinking about using currently before doing the calculation over time
((default * default[base]) + (internal * internal[base]))/(default[base] + internal[base])
Then to do the calculation over time, I'd use the changes in the calculated numerator and denominator to get the average.
Does this sound like to correct way to get this value? Is there a good way to verify?
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May 12, 2015
Can we backup a DB from SQL Server 2012 (Ent. edition) two node cluster to a local disk ?. Is it possible ?
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Feb 25, 2015
I have a SQL Server 2012 DB in Full recovery mode that has never had a TLOG backup. the log is huge 200+GB.
I tried doing a transaction log backup but there is not enough space on the Disk.
How can I reclaim this log space in SQL Server 2012?
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Jun 27, 2015
I am wondering what would be the best disk/RAID setup for a Windows server 2008 R2 OS and SQL Server 2012 database that has heavy read/write. I have the following disks I can use:
4x 15k 146GB
2x 10k 600GB
According to the server build requirements for the application, I need 100GB for the OS and 290GB for the drive containing the SQL mdf there are no stated requirements for the ldf, but would like to know if it should be allocated elsewhere?I should do RAID 10 for the 15k drives for SQL and RAID 1 for the OS on the 10k.
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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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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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Jun 1, 2015
I have a database in the 3rd normalized form. There is a need to load rows into a child table. To avoid having to drop RI, an ALTER TABLE WITH NOCHECK is being used. I am looking for a way to verify the integrity after the load is complete. After the load an ALTER TABLE WITH CHECK will be executed. Can I used DBCC to verify, that no orphaned child rows were loaded? If so, which parms would I have to use with DBCC?
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Jul 4, 2014
We have got a query for fine tuning and it is using lot of CTE ,how can i check the execution plan of that?
CREATE VIEW Mercy
AS
with ADR
as
(
SELECT urpx.RoleID ,
urx.UserID
FROM [DBA].dbo.URPX WITH ( NOLOCK )
INNER JOIN [DBA].dbo.URX WITH ( NOLOCK ) ON urpx.RoleID = urx.RoleID
WHERE PermissionID = '1'
),
SDR
as
(
-- Collect the roles that a configured with Sales Team Create permission
-- This will include Sales Director , Suite Admin,
SELECT urpx.RoleID
FROM [DBA].dbo.URPX WITH ( NOLOCK )
INNER JOIN [DBA].dbo.URX WITH ( NOLOCK ) ON urpx.RoleID = urx.RoleID
LEFT OUTER JOIN ADR ON ADR.UserID = urx.UserID
WHERE ADR.RoleID IS NULL
AND PermissionID='2'
)
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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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