Dealing With Latency Issues
Jul 17, 2007
hi,
I'm building a C# database application that access a remote sql 2005 database. For the moment I am using sql express edition. My application will be running in several REMOTE camps which only have an internet connection via sattelite. The sattelite connection has a very high latency. I am wondering what workarounds or solutions are available for this situation. All applications need to access the same database and preferebly be notified when changes take place on the database.
Thanks in advance.
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Feb 12, 2007
hi
I have a transactional replication that was running fine for about few months, but eversince there was a massive update of records at the publisher site and when I use the replication monitor, i notice Status: Performace Critical, Subscription:[localservername]:[Orders_Repl], Performance:Critical, Latency:03:34:47.
I was thinking of redoing the whole replication but before i am about to proceed. Can you guys explained what happen and what does it meant when Latency:03:34:47. I don't remember seeing a Latency:03:34:47.
I am hoping to solve this critical performance issue hope you guys can help. Thanks
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May 4, 2007
Hi,
I have a couple of questions to make.
How can i trigger notifications to my application ( C#)
without hanging in WaitFor Operation??
It's possible for broker service to call some remote
object that my application provide ???
Can Publish/Subscribe using Broker Service be used
for a low latency notifications (150ms ) max with milions of
messages published per second??
Thanks in advance
Sérgio
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Apr 15, 2008
Hello,
I have a question:
On my WM5 devide I run 2 query's right after eachother:
DELETE FROM test,
ALTER TABLE test ADD COLUMN abc bit NOT NULL",
I get an error on the second statement. When I change the statement in "NULL" instead of "NOT NULL" it works.
test is a very large table. It seems as if query 2 is executed while the engine is still processing query 1. And then you propably get the NOT NULL statement violation. Is this possible???
I know that writing the registry has some latency because WM5 uses flash instead of ram. Does SQL Compact have the same latency?
Or is this another problem?
Thanks in advance.
Marthijn
www.pdaddict.nl
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Jun 12, 2008
CREATE PROCEDURE [dbo].[proc_replication_latency_monitor]
AS
-- Procedure created by Henning Frettem (Lumbago), www.sqlteam.com, 12th of June 2008
BEGIN
SET NOCOUNT ON
DECLARE
@PublishedDBName varchar(200),
@SQL nvarchar(2000),
@PublicationPK int,
@PublicationName varchar(200),
@PublicationDatabase varchar(200),
@TracerTokenID int,
@Parmameters nvarchar(500)
DECLARE @Publications table (
PublicationPK int IDENTITY(1, 1) PRIMARY KEY CLUSTERED,
PublicationDatabase varchar(200),
PublicationName varchar(200),
TracerTokenID int,
TracerTokenPostTime datetime
)
DECLARE @Latency table (
PublicationPK int,
DistributorLatency bigint,
Subscriber sysname,
SubscriberDB sysname,
SubscriberLatency bigint,
OverallLatency bigint
)
--> Cursor for fetching all publications in all databases
DECLARE curPublishedDatabases CURSOR LOCAL FAST_FORWARD FOR
SELECT [name] FROM sys.databases WHERE is_published > 0
OPEN curPublishedDatabases
FETCH curPublishedDatabases INTO @PublishedDBName
WHILE @@FETCH_STATUS = 0
BEGIN
SET @SQL = N'SELECT ''' + @PublishedDBName + ''', [name] FROM ' + @PublishedDBName + '.dbo.syspublications'
INSERT INTO @Publications (PublicationDatabase, PublicationName)
EXEC sp_executesql @SQL
FETCH NEXT FROM curPublishedDatabases INTO @PublishedDBName
END
CLOSE curPublishedDatabases
DEALLOCATE curPublishedDatabases
--> Cursor for posting tracer tokens
DECLARE curPublications CURSOR LOCAL FAST_FORWARD FOR
SELECT PublicationPK, PublicationDatabase, PublicationName FROM @Publications
OPEN curPublications
FETCH curPublications INTO @PublicationPK, @PublicationDatabase, @PublicationName
WHILE @@FETCH_STATUS = 0
BEGIN
SET @Parmameters = N'@PublicationName varchar(200), @TracerTokenID_OUT int OUTPUT';
SET @SQL = N'EXEC ' + @PublicationDatabase + '.sys.sp_posttracertoken @publication = @PublicationName, @tracer_token_id = @TracerTokenID_OUT OUTPUT'
EXEC sp_executesql @SQL, @Parmameters, @PublicationName = @PublicationName, @TracerTokenID_OUT = @TracerTokenID OUTPUT
UPDATE @Publications SET
TracerTokenID = @TracerTokenID,
TracerTokenPostTime = GETDATE()
WHERE PublicationPK = @PublicationPK
FETCH NEXT FROM curPublications INTO @PublicationPK, @PublicationDatabase, @PublicationName
END
CLOSE curPublications
DEALLOCATE curPublications
--> Wait two minutes for all tokens to be commited at all subscribers
WAITFOR DELAY '000:02:00.000'
--> Then check the results for each posted token
DECLARE curTokens CURSOR LOCAL FAST_FORWARD FOR
SELECT PublicationPK, PublicationDatabase, PublicationName, TracerTokenID FROM @Publications
OPEN curTokens
FETCH curTokens INTO @PublicationPK, @PublicationDatabase, @PublicationName, @TracerTokenID
WHILE @@FETCH_STATUS = 0
BEGIN
--> Insert token history for each token
SET @SQL = N'EXEC ' + @PublicationDatabase + '.dbo.sp_helptracertokenhistory @publication = ''' + @PublicationName + ''', @tracer_id = ' + CAST(@TracerTokenID AS VARCHAR(50)) + ''
INSERT INTO @Latency
(DistributorLatency, Subscriber, SubscriberDB, SubscriberLatency, OverallLatency)
EXEC sp_executesql @SQL
--> Make sure that the PublicationPK is added to the token history
UPDATE @Latency SET PublicationPK = @PublicationPK WHERE PublicationPK IS NULL
--> Clean up the tracer token
SET @SQL = N'EXEC ' + @PublicationDatabase + '.sys.sp_deletetracertokenhistory @publication = ''' + @PublicationName + ''', @tracer_id = ' + CAST(@TracerTokenID AS VARCHAR(50)) + ''
EXEC sp_executesql @SQL
FETCH NEXT FROM curTokens INTO @PublicationPK, @PublicationDatabase, @PublicationName, @TracerTokenID
END
CLOSE curTokens
DEALLOCATE curTokens
SELECT
b.PublicationDatabase,
b.PublicationName,
a.Subscriber,
a.SubscriberDB,
a.OverallLatency,
b.TracerTokenPostTime
FROM @Latency a
INNER JOIN @Publications b
ON a.PublicationPK = b.PublicationPK
END
--
Lumbago
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Oct 19, 2007
Hello!
We have setup up transactional replication with dedicated distributor in SQL Server 2005 environment. I have noticed that during particular time of the day latency is increasing dramatically. I have been checking Tracer Tokens and Total latency during that time is around 30-40 min (both publisher to distributor and distributor to subscriber is taking much longer that normal). Normally, it is less than 10 sec. I was wondering if there is a way to pinpoint exact cause of the latency. This is pull subscription.
I would appreciate if someone can share (or point to the right direction) best practice on transactional replication setup/maintenance. My understanding is that only committed transactions are replicated, correct? I checked database on publisher and didn't see any outstanding long running transaction.
Any help is greatly appreciated.
Thanks,
Igor
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Jul 31, 2007
I have been working on a project to evaluate transactional replication in SQL Server 2005 to find out if it will be suitable to provide real time reporting without impacting the primary database server. Thus far I have not seen latency better than several seconds replicating a change to a table or by utilizing the "tracer tokens" troubleshooting functionality. It usually takes a couple seconds from the publisher to the distributor and a couple more from the distributor to the subscriber.
I guess my question is actually whether it is possible to achieve sub-second (milliseconds) latency for transactional replication under any circumstances. Someone on another forum told me it was not, so I thought I would ask a separate community to confirm. Regarding the hardware, the latency on ping is less than 1ms between the servers and the servers themselves are decently powered quad processor boxes w/ 4GB of ram each. It seems to have the same latency of 3-5 seconds regardless of whether I publish a single table or all of the tables in the database. I currently have it configured with the publisher on one server and the distributor/subscriber on the second with the log reader and distributor agents set to run continuously. If it is possible, please recommend configuration of the agents or the topology of the PDS to achieve this. Thanks in advance for any insight you provide.
Dan
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Jun 2, 2015
What is the measurement for Latency on the replication monitor? Is it hr:mm:ss, or is it mm:ss.ms?
I see
Performance = CriticalLatency = 2:41:52Last Synchronization = 6/2/2015 9:02:21 AM (current time)
Is the Latency 2 minutes 41 seconds behind or 2 hours 41 minutes behind?
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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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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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Feb 22, 2008
Hi,
I have multiple questions and would appreciate any suggestions in resolving them. I'm a novice to these issues.
1) First of all, what is the exact command to setup the trunc. log on chkpt. option on for a transactional log of a SQL Server 2000 database? Is this option on by default? I have noticed for one of the databases I'm managing that the transaction log was over 12 GB, while the db was only 425 MB.
2) How's it possible to run a DBCC TRACEON to see the content of the transaction log to see if we are having any issues with any uncommitted transactions, i.e. updates, inserts, and/or deletes.
3) What are the commands to truncate inactive transactions and increasing the readbatchsize?
4) lastly, how do I validate transactional replication via checksum and find valid latency between a small number of changes that need to be committed between publisher and subscriber.
Thank you so much in advance!
Sincerely,
Alla
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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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Aug 27, 2015
We have several read-only nodes in our AlwaysOn cluster, which are set to use Synchronous-commit mode, which ensures that the logs are updated on the read-only nodes before any update statements complete. Even with this option, if we query a read-only node before the logs have been processed, we can read old data. I would like to know a strategy to ensure that a read-only query will definitely return up to date information. I had an idea that if I just used a different transaction type, like Serializable, that it might block the read-only query from actually getting the data until after the log file was processed, but I have not tried it, yet.
I would like to move more queries to the read-only nodes, in an effort to offload CPU utilization from the primary node.
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Jul 31, 2007
I have 2 servers; 1 in the head office and the 2nd at a remote location connected over a satellite. The satellite connection has typical latency and bandwidth. 2 mb down and 128kb up. Latency is average of 700ms.
Both servers have plenty of processing power and RAM and are very underutilized.
I have 1 push publication at the publisher at the remote location. The publication has 1 article. The table that is contained in the article only grows; ie inserts are the only statements applied, no updates or deletes. The table grows by 5 inserts every second(approximate). the table has 5 columns. none of the columns are blobs etc. An ID field, 1 datetime, 2 integers and 1 float column.
I have the agents set for continuous with a 2 second polling interval.
I am aware of the following command parameters for the agents but not sure which way to go to maximize the throughput of the data.
MaxCmdsInTran
SubscriptionStreams
ReadBatchSize
CommitBatchSize
PollingInterval
The subscriber table also has an insert after trigger to update another small table with the current value. Under normal network conditions, the trigger works great. Over the sat connection with high latency, the smaller target table seems to get a lock placed on it. I can only guess that the lock is from the inserts and perhaps a large number of inserts per transaction?
Under normal network conditions, the latency between publisher - distribution - subsciber is about 4 seconds.
What would be good command parameter settings for the agents to compensate for the latency?
Thanks,
Kevin
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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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Jan 10, 2008
Hello!
Is there an easy way to deal with this situation below when reading in data from a SQL Database:
int? myNullableColumn;myNullableColumn = Convert.ToInt32(datarow["datacolumn"]);
Where, ideally, 'myNullableColumn' would be 'null' if the value was 'DBNull.Value'. This does not work because Convert.ToInt32 will not convert 'DBNull.Value to null', but instead throws an error.
Is there a built in funtion that does do this?
Thanks!
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Mar 14, 2008
Ok, I have a table with about 47000 records in it. I have the following query for that table:Select ReportType =
Case
When ReportType = 1 Then 'Uniquery Report'
When ReportType = 2 Then 'SABRE Report'
When ReportType = 3 Then 'Menu Report'
Else Null
End,
ReportNameTo_,
Frequency.Frequency as Frequency,
ReportDate,
ReportDescription
From Report
Inner Join Frequency on ( Report.ReportFrequency = Frequency.FID )
Where ( Active = 1 )
And ReportDate = ( Select Max ( ReportDate ) From Report Where ( Active = 1 ) )
And ReportID = ( Select Max ( ReportID ) From Report Where ( Active = 1 ) )
The idea is that i need to get only the last report based off of unique reportname. I added a computer column to the table to give me the ReportNameTo_, since my deliminator is the _. Now my issue is that I have 1 records showing (the last record added to the table), which is right for the query that is written, but wrong for what I want. I need to only return the last record for each unique ReportNameTo_. So as an example, my table has the following ID, ReportNameTo_, Date fields the data looks something like this:
1, 123_, 1/1/20082, 123_, 1/1/20083, 124_, 1/1/20084, 124_, 1/1/20085, 125_, 1/1/20086, 125_, 1/1/20087, 126_, 1/1/20088, 126_, 1/1/2008
I only want to return the following:
2, 123_, 1/1/20084, 124_, 1/1/20086, 125_, 1/1/20088, 126_, 1/1/2008
Hope someone out there can let me know how to do this... I am almost there, just not all the way.
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Feb 15, 2002
Hello!
Just looking for advise on dealing with duplicates in database.
I have a contact table that have a bunch of duplicated customer records.
My goal is to combine all duplicated records into one record.
This involves couple tables:contact,contact history ,calendar.
All tables related by common column "accountno".
What would be the best approach for this?
Thank you,
Lena
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Mar 15, 2002
I have the following query in a stored procedure. If there are no rows in the history file, it returns a null. If there some setting or function that would have it return a zero if no rows are found? I use the variable to do arithmetic later on and a null messes everything up.
select@MarketTotal = sum(isnull(MarketValue,0))
fromhistory
whereEmpUID = @EmpUID and
Shares > 0
Thanks,
Ken Nicholson
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Jun 9, 2006
Hi i have the following :
select agent, name, surname, address, cust1_text01, cust1_text02, phone1,
case call_type_id
*when NULL then ''
else call_type_id
end as 'call_type_id'
from Record_T
* I have also tried when NULL then space(1)
yet the query still returns NULL when this field is empty ?
the idea is to always return data, even if the field is NULL to
replace it with an empty space or spaces.
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Sep 28, 2007
Hello,
Question 1:
In my senario i've developed a system which utilizes 2 database, i've writen queries like db1.dbo.table1 join db2.dbo.table2 etc... Now that db2 is getting huge, client wants to shift it to another server.
I don't know how to modifiy my queries to cope with such situation. Could somebody plz tell me on how to you write queries involving two databases from different servers.
Question 2:
I'm maintaining second database (db2) to keep track of records of db1 which have been processed by my software, so that when db1 gets added with more records i can compare db2 table with db1 table to identify which records are new.
db1 is not my database and i don't have any control over that, (it's some erp db), is there any way of identifying which rows have been processed. Can the need for db2 be eliminated?
I'm using SQL Server 2005
Thank You,
Sandeep.
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Jul 31, 2006
hi ive got a inert sub where i grab values from text boxes etxthe values are passed to a stored procedure however , one of these fields is a date field , but the field is not required ...so on this line if the date text box is left blank i get an error , not a valid date .Parameters.Add("@actiondate", SqlDbType.DateTime).Value = txtActionDate.Texti have tried ( the actiondate field can take nulls ..)if txtActionDate="" then .Parameters.Add("@actiondate", SqlDbType.DateTime).Value = nothing else.Parameters.Add("@actiondate", SqlDbType.DateTime).Value = txtActionDate.Textend if but this doesnt workwhat is the best way of allowing blank values to be passed to the stored procedure( it doesnt fall over with normal text / varchar fields ) thanks
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Apr 4, 2007
I am trying to make a stored procedure in SQLServer Express.The question is related to this stored procedure / transact - sql. I think i am doing something wrong with datetime.Here is the stored procedure.The error i am getting is that:Msg 241, Level 16, State 1, Line 20Syntax error converting datetime from character string. ===================================== DECLARE @websiteID intDECLARE @dateFrom datetimeDECLARE @dateTo datetimeDECLARE @sortbystring varchar (20)set @websiteID = 1set @dateFrom = Convert(datetime, '2007-02-07 12:01:00')set @dateTo = Convert(datetime, '2007-03-07 11:59:00')set @sortbystring = 'Campaign'IF ISNULL(@dateTo, '') = ''begin SET @dateTo = @dateFromendSET @dateTo = DATEADD(d, 1, @dateTo)DECLARE @str CHAR(400)LINE 20: SET @str = 'SELECT dateEntry, c.name as Campaign, e.firstname as FirstName FROM entry e, campaign c WHERE e.campaignID = c.id ' + 'AND c.websiteID = @websiteID' + 'AND (ISNULL(' + @dateFrom + ', '''') = '''' OR e.dateEntry BETWEEN '' + @dateFrom + '' AND '' + @dateTo + '') ' + 'AND e.IP NOT IN (SELECT IP FROM IP) ' + ' ORDER BY dateEntry DESC'print (@str)===============================================
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Dec 16, 2004
I have a stored procedure that takes less than 1 second in sql query analyzer to return my results.
I run this same SP in ASP.NET using a calendar control and using perf monitor I notice that for me from my dev machine my cpu utilization is sometimes over 40%.Is there any tweaks I can do to help decrease CPU utilization.
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Jan 23, 2004
I'm looking for opinions here:
I have a stored procedure that has one required variable, and two optional variables, like this:
CREATE PROCEDURE sp_tariff_rule
@tariff_id INT,
@start_date DATETIME = NULL,
@end_date DATETIME = NULL
...etc...
I want the procedure to process
1) all data is no dates are presented
2) all data after the start date, if no end date is supplied
3) all data before the end date if no start date is supplied
4) all data between the start and end dates if both are supplied
Now, instead of an elaborate conditional, I added this to the WHERE clause of my SQL statement:
AND ((@start_date IS NULL OR service_date >= @start_date) AND (@end_date IS NULL OR service_date <= @end_date))
It works fine, but I want to know if anyone has a different/better way of doing it, or if there is a big bug waiting to happen here.
I typically don't like to create multipurpose routines in my code, but this is a better approach for my in a non-object-oriented world of SQL.
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Nov 14, 2005
In SS 2000 it seems that there is no variable data type that can hold more than 8000 characters (varchar) or 4000 unicode characters (nvarchar). I've seen posts where multiple variables are spliced together to extend this limit. I am looking at performing string manipulations in an sproc and I need to be able to deal with the full 2GB/1GB limit of text and ntext field types. Is this possible? How do you deal with that?
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May 31, 2007
Hello all. Got bit of a long winded question here...........so here we go lol.
OK.......ive got data on an Excel spreadsheet. Ive set the spreadsheet up as a linked server and i'm creating a set of insert statements from it by using the following code:
SELECT 'INSERT INTO TRAINREC (COURSE_NAME) VALUES ('''+
EMPLOY_REF + ''', '''+
FROM AtriumDD...['Employee Training Records$']
For most records this generates a correct insert statement.........for example:
INSERT INTO TRAINREC (EMPLOY_REF, COURSE_NAME) VALUES ('153', 'NMA Panel');
However.........my problems start when the value for course name is containes an ' character. If it does the insert statement generated is incorrect. For example:
INSERT INTO TRAINREC (EMPLOY_REF, COURSE_NAME) VALUES ('139', 'Annual Accounting in Lloyd's Market');
can anyone suggest any ideas on how to get round this? Also if i havent explained it clearly enough just let me know and i can try and expand on it.
Thanks for reading.
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Jul 20, 2005
I have a stored procedure as a recordsource from a contacts table. Inthis example, users can enter parameters to limit contacts by firstletter of last name or company name or keywords:Example:@myName nvarchar(30) = null,@Alpha char(1) = nullSELECTContacts.ContactID, ContactType,CASE WHEN Contacts.ContactType = 0THEN Contacts.CompanyNameELSEisNull(Contacts.LastName,'?') + ', ' +isNull(Contacts.FirstName,'?')ENDAS CNAMEFROMContactsWHERE(Keywords Like '%' + @myKeyword + '%' OR @myKeyword is Null)So far, so good, but...The problem is I want to also give the user the option of filteringalphabetically by first letter. I can't figure out how to deal withnulls in this example (user doesn't enter anything as parameter@Alpha):AND(@Alpha = CASE ContactType WHEN 0 THEN Left(LastName,1) ENDOR@Alpha = CASE ContactType WHEN 1 THEN Left(CompanyName,1) END)Any help is appreciated,LQ
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Apr 3, 2007
Hi,
I just realized something. In the old DTS package I am migrating, there is an ActiveX script that checks for a certain condition in a row. If the condition is true, then it does:
DTSTransformationStat_SkipRow
I just can't believe there isn't an equivalent functionality in SSIS.
However, so far, I have tried the following:
1.) Redirect file error output (on all columns in the file)
2.) Use a conditional transform to search for a text string in a column (the "bad" row has different text in it)
And still, I keep getting errors that there is an "impartial row" in the file. Yes, I know that - why doesn't the error redirection catch this? Why doesn't the conditional expression catch it either?
Am I missing something here? Is it just buggy? I find it hard to believe I have to work around something that worked just fine in DTS.
Thanks
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