Replication Performance Measurement
Apr 18, 2006
Hello,
I am trying some replication sample.I create a table with thousands of records in the publisher side. as I create a subscription(the subscription database is on a remote machine),
the whole table is created on the remote database.
I wanted to measure the performence as:
1. how much time was taken in filling the whole table in the subscriber side?
2. If i insert some 10000 records on publisher side, I want to measure, how much time was taken in inserting the same records on the subscriber?
How do I measure this ? Can I use some Log reader stuff.
thanks in advance
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Jun 2, 2015
What is the measurement for Latency on the replication monitor? Â Is it hr:mm:ss, or is it mm:ss.ms?
I seeÂ
Performance =Â CriticalLatency = 2:41:52Last Synchronization = 6/2/2015 9:02:21 AMÂ (current time)
Is the Latency 2 minutes 41 seconds behind or 2 hours 41 minutes behind?
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Mar 24, 2014
I need accumulate the months by Quarter measurement. For example we're in March now and I need put these code in Where clause like:
Where MyDate > DATEADD(mm, -11, DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0)) ...
here DATEADD(mm, -11, DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0)) makes Apr of last year included because that is the first month in 2nd Quarter of last year. But in next month we're in Apr and I need make -11 as -12 in above code to include Apr of last year. And same reason if we're in Feb. 2014 then I need change -11 to -10.
So how can I calculate this to make the number fit into the code or some other way to get the same effect? I need get all last 4 quarters based on current month (include current Quarter).
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Jun 4, 2008
The below code works fine to measure the difference in days between two dates.
However, there is an additional business requirement to subtract week-ends, and holidays, from the equation.
Any ideas on how to accomplish this task, and leverage the below, existing code? Thanks in advance!
(SELECT ABS((TO_DATE(TO_CHAR(" & ToFieldDate & "),'yyyymmdd') - TO_DATE(TO_CHAR(" & FromFieldDate & "),'yyyymmdd'))) FROM DUAL) AS Measurement "
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Jun 25, 2006
I'm having a tough time finding any good resources on Sql Server Replication Performance. Are there any benchmarks / state of any kind? How well does replication scale out?
In my scenario, I have one central publisher and several large tables, all with hundreds of millions of records. Every day I may insert/update millions of records in the publisher, and then I need to replicate the changes (in a few hours at most) onto a pool of subscribers, while they remain online.
Is the replication story robust enough to handle a situation like this?
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Oct 26, 1999
Can anyone suggest hwo can I improve the performance of the replication process and make it faster.
Pran
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Mar 9, 2004
Hi all,
I am keen to hear peoples perspectives on how much additional load Transactional Replication will have on a server.
Obviously this will depend greatly on the level of transactions in the database, but a general indication would be great (eg 10% increase in overheads).
I am thinking of encorperating this into a new server structure which we are going to be setting up and am unsure as to whether to make the primary server BOTH the publisher and distributor; or make the secondary server the distributor to reduce the load on the primary to only being the publisher.
Basically the secondary server will simply be a 'hot swap' of the primary - so i/o load on the secondary is not going to be an issue.
There may be 2 primary's (if that makes sense) replicating to the hot swap so that if either primary is dropped the hot swap could take over either servers load/responsibilities - not sure if this will make a difference on where to put the roles?
Anyone have any thoughts on this?
Thanks in advance.
Cheers
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Aug 24, 2006
Hello,could you please advice on how to measure replication performancein Oracle, DB2 & MS SQL Server RDBMS installed in Windows servers ?I've got two servers with databases installed and configured,I prepared set of data using DBGEN from TPC and I already imported theminto databases.Also, I configured the replication.Now I have to do a test with a few kind of replications methodimplemented in these RDMBS, but I don't know which tool or reports or"v$iews" should I use to measure replication performance.The replication is configured only between the same RDBMS, I meanOracle <-Oracle, DB2 <-DB2 and MSSQL<-MSSQL.Most of applications are great for checking performance of local DB,not for replicated/distributed.I've found description of CA Unicenter Database Performance Managementfor distributed RDMBS, and I think it could be the right one, but Ican't find any demo or trial version :(Could you please advice any place to download it, or other application,script, description, just whatever.Perhaps just any other idea how to check the replication mechanismefficiency ?Regards,Mark
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Jul 20, 2005
I'm seearching for information regarding database replicationperformance. We need to compare the performance of replication for SQLServer and Oracle and it is urgent! Anyone who can describe theperformance bottlenecks for each database when performing replication,or can point me to a white paper or webpage.
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May 15, 2007
Hello to all,
I have a performance question: we have a cluster with 2 SQL instances on 1 node (another instance is on another node, but no link with my current problem!). Let's call them C1SQL1 and C1SQL2.
This node is a Hyperthreaded Xeon 2.8Ghz with 1 gig of memory.
These 2 instances are using transactionnal replication and are configured as the distributor and publisher. C1SQL1 is not using much power, it's a small replication with around 10 agents. C1SQL2 is a bit heavier, with around 100 distribution agents. C1SQL2 has around 50 subscribers in 12 publications, but not all subscribers are used in each publications.
Once in a while, this cluster node impacts our production environment (since it's also a production server) and we're wondering if performance wise, it's really not powerfull enough to be the distributor?
I've isolated C1SQL2 on it's own logical CPU, and in idle mode, the replication workload (history, checking if new transactions are made) peaks at around 15-50% each 4-10 seconds.
Can I have any input on this?
Thanks!
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Feb 25, 2004
Hi
I have sucessfully set up transactional replication, allowing the subscriber to update the publisher. All works well for a while, but after a couple of weeks or so it fails, but always for a different reason !
My question is, is there anything that can be done to help replication stay healthy. I had thought of doing regular backups of the database and the transaction log, and then truncating the transaction log.
Any advice, or links to other troubleshooting resource much appreciated.
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Dec 14, 2006
Hi all.
Any assistance would be greatly appreciated.
We recently created transactional replication to hopefully improve performance issues we were expereincing. The replication is between 2 SQL Servers (2000), and since we have introduced the replication, the performance has degraded considerably.
I will try and explain the scenario.
We have a primary db that our internal users use and we also have the newly replicated db that our website and another application use. The users are complaining that the website and the internal application is extremely slow and I was just wondering if it is possible to do an Index Tuning on both the primary db and replicated db based on trace files so as to create new indexes or would this have an impact on the replication?
Thanks in advance.
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Dec 18, 2006
Hello,
I have been experiencing some difficulties with poorly performing synchronizations using replication from SQL Server 2005 to SQL Server Mobile running on Windows Mobile 5 devices. Currently there are two main databases (each client will only use one of them), the 1st one has around 500,000 rows, and the 2nd has about 1,200,000 rows. The initial synchronization for the 1st database takes around 45 minutes, and for the 2nd, around 2.5 hours. This is quite long, but we have comforted our clients by saying that this is a one time delay, and that further synchronizations will be much quicker. Well, synchronizing the data after this is usually quite speedy, however, things get bad rather quickly when the number of changes increases.
In normal cases, the client will have at most a few thousand changes and all is well, the synchronization will typically be under a few minutes - no big deal. Once in a while though, there are a substantial number of changes to the database (from the SQL Server 2005 side), perhaps around 50,000 changes. When this happens, the synchronization process doesn't seem to ever finish (I've left it over the weekend and come back to find it still synchronizing). For the record, there seems to be a level at which the database will finish synchronizing, but be agonizingly slow - around 10,000 to 20,000 records will finish eventually (but take a few hours, at which point it's faster to just blow away the database and start again from scratch). This is obviously not acceptable, and I need to find a way to resolve this. Does anyone have any thoughts?
While on this topic, why does this synchronization process take so long anyways? The snapshot creation (even for the database with millions of rows) finishes in a couple minutes, and the actual transfer of data shouldn't take more than a few minutes. The device can't possibly be storing the database content in memory (the SDF file ends up being between 40MB and 100MB), but when I watch network activity, there tends to be an initial busy period, then a periodic and fairly small spike every few seconds until the process completes, so the connection isn't being saturated at all.
At this point, I am almost considering breaking the nice database design I have and creating combined logical records to see if reducing the number of rows may help. I'd really prefer not to have to go this route though, so if anyone has any suggestions, I'd really appreciate some feedback.
Thanks,
Adrien.
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Jun 29, 2006
The client production server CPU starts thrashing. Task manager indicates that SQL server is gobbling CPU cycles. Having a look at the replication monitor, it is obvious that indivual synchronisations to the mobile devices are taking significantly longer expected.
Observing an indivual synchronisation attempt, the Upload changes to Publisher rows are very quickly resolved.
The Download changes to Subscriber seems to take up a very long time.
Along the way, the estimated completion does a few interesting things, like going from 100% complete with no estimated time to complete, back to seomthing like 77% with 2 minutes left to complete.
This sort of behaviour occurs when there are only a hundred rows to download.
Synchronisations for minimal amounts of data suddenly taking anywhere from 2 to 15 minutes. Totally unacceptable form the client perspective but seems that 2005 behaves quite different from 2000 and the tricks are yet to reveal themselves.
Note - It is a server hardware issue as there is in excess of 3 GB ram, the database is on a SAN and there are 4 3Ghz CPUS in operation.
Any possible help appreciated as this issue is beginning to drag on.
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Sep 27, 2007
I have just upgraded from 2000 to 2005 and my transactional replication is running very slow, I already have a latency of 10 mins and its getting worse. I'm just using the default agent profile, is there anything I need to change?
Help please.
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Jun 7, 2007
Hi All,
We are developing a system which will have to support more than 3000
subscribers. We will have to support both Transactional replication
and Merge replication.
I checked the following document about SQL 2005 replication <http://
www.microsoft.com/technet/prodtechnol/sql/2005/mergrepl.mspx>. The
document does not clearly specify what is the maximum number of
subscribers supported without a significant performance degradation.
The questions i have are:
1. Given the fact that there will be more than 3000 subscribers, there
will be more than 500-1000 subscribers trying to replicate at the same
time. Will be there be a performance degradtion in such a scenario
2. Has anyone used SQL Server 2005 in a scenario involving more than
3000 subscribers?
3. Will it be better if we develop our own system to perform
replication activity instead of relying on SQL Server 2005?
- Ngm
Mail me atnarasimha (DOT) gm (AT) gmail (DOT) com )
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Feb 25, 2008
Wondering if anyone has any experience with SQL Server Express Edition (SSEXP). We're looking at a mobile sales force type model, so a local database on a laptop with no real time network connection. So the users would collect data locally, then connect up to the network every few days to replicate the data to a central server.
So questions.. Has anyone tried anything similar? How stable/mature is SSEXP? Any other thoughts, alternatives or gotchas anyone can think of?
Thanks for the input.
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May 14, 2007
Summary: Started replication April 1 of 4M xact / day publishing system to subscribing system.
Performance was good. Latency was ~ 5-7 seconds.
May 10 we noticed that the DB was behind (latency was 12 hours).
All performance counters seem good with the exception of the disk.
. Performance spikes are 8 minutes apart and last from 30 - 60 seconds.
. During this period, Disk % Busy (1 - Disk % Idle) is 100%
The publisher DB publishes about 50-52 xacts/sec.
Rate of distribution (distribution DB to Subscriber DB) is ~ 47 xacts / second, so latency is increasing (currently at 33 hours). Previously my Subscriber system's "capacity" was 150 xacts / sec.
I know this because several weeks ago, the network went down, we were 24 hours behind.
When the network came back up the replication subscriber system was able to catchup at around 150 xacts / sec, or 3X the production system rate.
What has changed between then and now? Not much. We did install Tivoli Service Manager (IBM's backup system) a couple of weeks ago. It seems to run fine on a nightly basis, but I don't see any periodic heavy Disk I/O from that. Just to be sure, I've had them shut the TSM services down just to be sure.
We've also eliminated all extraneous processes other than those I need for performance monitoring (there was a RTVscan, virus scan process).
I've eliminated Autogrowth's as an issue as I've bumped the growth so that they are very infrequent (several days at this point. When we resolve the problem, I'll dial this down to something more reasonable.
My disk configuration is not ideal I realize (single Raid-5 disk with 3 partitions), however, this has not changed in the 6 weeks.
Thanks for any help on this!
Jack Griffith
Configuration:
Subscribing System:
SQL Server: 2000, SP4 - 8.0.2039
CPU - 2.8GHZ Xeon, Quad Dual-core
Memory - 3.5GB RAM
Disk: 3 partitions on a single RAID-5 disk with 1118 GB of space:
C: 39GB System and Programs
D: 97GB Log space
E: 982 GB Data space
Replication configuration:
- nosynch, continuous Transactional Replication
- Distribution db is on Subscription system
- distribution - Publication of approx. 50 transactions / second
Subscriber DB configuration:
DB size: 64458 MB
Logging: Simple (at this point)
distribution
DB size: 3111 MB
Logging: Simple (at this point)
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Jun 10, 2015
I've been asked to put together an estimation for the performance impact that replication would have on our database server during a particular operation. I know that this depends on a lot of different factors, including:
* Number of articles being replicated
* Types of articles being replicated
* Number of DML transactions that would result in delivery of replicated data
Any way to turn this into a meaningful metric?
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Sep 21, 2007
Hello,
We previously having two servers A and B. Server A is used for updation of data and the data then replicated to server B. Server B is used for
Server A :
purpose : used for database updation/ modification
SQL Server version : SQL Server 2000 SP 2
Server Z :
purpose : used for Reporting
SQL Server version : SQL Server 2000 SP 2
We were doing Transactional replication from Server A to Server B.
Last month we have broght another server (Server B) with same hardware configuration but having SQL SERVER 2005 installed. This is to speed up our database update process. We have moved some of the database on this new server so that we can achieve our deadlines.
Server B :
purpose : used for database updation/ modification
SQL Server version : SQL Server 2005
I have set up the transactional replication from Server B to Server Z and replication works fine.
However, the issue is after it is started replicating from this new server (Server B) performance of all the queries reduced a lot.(making my life harder)
I didnt expected this as our reporting server is still SQL server 2000.
I have restored the backup of database which was replicated from server A (sql server 2000) and compared execution plan for one of our common query (which is used in most of the reports and which is now taking longer time to provide results)
I found that database which is replicated from Server B (Sql server 2005) is having primary keys. which was not present in the database which replicated from server A(Sql server 2000).
I have then removed the primary key and make the indexes same as previous copy of database(which was replicated from server A) But still the query takes long time.
Execution plan now shows "Table Spool" which was not present in previous copy of database.
Almost every query for this database is taking longer time now.
Can someone suggest me what is wrong and what should I need to fix.
Am I going on the right direction?
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Jan 8, 2007
Hi guys , may I know is there any examples of store procedure/scripts for monitoring replication status and performance ? I just know about sp_replmonitorhelppublisher. Thx for the assistance.
From,
Hans
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Feb 21, 2007
We recently implemented merge replication.We were expereincing. The replication is between 2 SQL Servers (2005) over same network box, and since we have introduced the replication, the performance has degraded considerably on subscriber end.
1) One thing that should be mention is that its a "unidirectional Direction" flow of changes is from publisher towards subscriber (only one publisher and distributor as well and one subscriber ).
2) Updates are high than inserts and only one article let say "Article1" ave update up to 2000 per day and i am experiecing that dbo.MSmerge_upd_sp_Article1_GUID taking more cpu time.what should be do..
on subscriber database response time is going to slow and i am experiencing a lot of number of LOCK time outs on application end.
can any one can also suggest me server level settings for aviding locking time out.
looking for any experieced solution/suggestion.
Thanks in advance.
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Oct 8, 2007
We have a SQLServer 2005 Enterprise merge replication publication with SQL Mobile 3.0 subscribers (Windows Mobile 5.0 and 6.0). We do not use pre-computed partitions due to trigger performance issues with an SSIS/ETL application that supplies data to the merge database. We do use the "Optimize" (=true) option, though we have tried this both ways with no significant differences. We use filters and joins for each worker ID (as HOST_ID) from the subscriptions.
The sync times become increasingly worse after we run the snapshot and bring the publication online. I have tried rerunning the snapshots, this helps little, as it often behaves like the subscription was set to reinitialize and forces a big sync (reload of all data) to the subscriber. We have tried much of the obvious (e.g., flattening filters and joins, adding indexes, etc.).
When users are synchronizing, we watch replication monitor and notice that a lot of time is spent processing "enumerating inserts and updates for article [any article]", especially processing the many generations and batches. This is true for any follow-up syncs after the 1st big sync (initializing the subscription).
I read several posts regarding the batches and generations of changes, and decided to try increasing the €œDownloadGenerationsPerBatch€?. I tried adding this parameter to the snapshot agent job, and the job fails each time with a vague message, even with the default value of 100. How do you change this parameter for SQLServer 2005 Enterprise?
Any suggestions?
Thanks in advance,
Matt
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Sep 12, 2004
1. Use mssql server agent service to take the schedule
2. Use a .NET windows service with timers to call SqlClientConnection
above, which way would be faster and get a better performance?
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Jun 23, 2006
Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server with aparticular query. It would take approximately 22 seconds to return 100rows, thats about 0.22 seconds per row. Note: I ran the query in singleuser mode. So I tested the query on the Development server by taking abackup (.dmp) of the database and moving it onto the dev server. I ranthe same query and found that it ran in less than a second.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue is relatedto some external hardware issue like: disk space, memory etc. Or couldit be OS software related issues, like service packs, SQL Serverconfiguations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating system related issue.Any Ideas would help me greatly!Thanks,Brian T*** Sent via Developersdex http://www.developersdex.com ***
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Jun 22, 2006
Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server witha particular query. It would take approximately 22 seconds to return100 rows, thats about 0.22 seconds per row. Note: I ran the query insingle user mode. So I tested the query on the Development server bytaking a backup (.dmp) of the database and moving it onto the devserver. I ran the same query and found that it ran in less than asecond.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue isrelated to some external hardware issue like: disk space, memory etc.Or could it be OS software related issues, like service packs, SQLServer configuations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating systemrelated issue.Any Ideas would help me greatly!Thanks,Brian T
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Jun 15, 2007
I'm getting this, after upgrading from 2000 to 2005.Replication-Replication Distribution Subsystem: agent (null) failed.The subscription to publication '(null)' has expired or does notexist.The only suggestions I've seen are to dump all subscriptions. Sincewe have several dozen publications to several servers, is there adecent way to script it all out, if that's the only suggestion?Thanks in advance.
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Sep 13, 2007
Hi,I have transactional replication set up on on of our MS SQL 2000 (SP4)Std Edition database serverBecause of an unfortunate scenario, I had to restore one of thepublication databases. I scripted the replication module and droppedthe publication first. Then did a full restore.When I try to set up the replication thru the script, it created thepublication with the following error messageServer: Msg 2714, Level 16, State 5, Procedure SYNC_FCR ToGPRPTS_GL00100, Line 1There is already an object named 'SYNC_FCR To GPRPTS_GL00100' in thedatabase.It seems the previous replication has set up these system viewsSYNC_FCR To GPRPTS_GL00100. And I have tried dropping the replicationmodule again to see if it drops the views but it didn't.The replication fails with some wired error & complains about thisviews when I try to run the synch..I even tried running the sp_removedbreplication to drop thereplication module, but the views do not seem to disappear.My question is how do I remove these system views or how do I make thereplication work without using these views or create new views.. Whyis this creating those system views in the first place?I would appreciate if anyone can help me fix this issue. Please feelfree to let me know if any additional information or scripts needed.Thanks in advance..Regards,Aravin Rajendra.
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Jan 17, 2002
Hi,
In my production box is running on SQL7.0 with Merge replication and i want add one more table and i want add one more column existing replication table. Any body guide me how to add .This is very urgent
Regards
Don
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Aug 22, 2007
Hello,
I have this problem on a Production database.
DBCC OPENTRAN shows "REPLICATION" on a server that is not configured for replication. The transaction log is almost as large as the database (40GB) with a Simple recovery model. I would like to find out how the log can be truncated in such a situation.
Thank you.
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Mar 6, 2007
Hello,I'm getting the following error message when I try add a row using aStored Procedure."The identity range managed by replication is full and must be updatedby a replication agent".I read up on the subject and have tried the following solutionsaccording to MSDN without any luck.(http://support.Microsoft.com/kb/304706 )sp_adjustpublisheridentityrange (http://msdn2.microsoft.com/en-us/library/aa239401(SQL.80).aspx ) has no effectFor Testing:I've reloaded everything from scratch, created the pulications from byrunning the sql scripts generated,created replication snapshots andstarted the agents.I've checked the current Identity values in the Agent Table:DBCC CHECKIDENT ('Agent', NORESEED)Checking identity information: current identity value '18606', currentcolumn value '18606'.I check the Table to make sure there will be no conflicts with theprimary key:SELECT AgentID FROM Agent ORDER BY AgentID DESC18603 is the largest AgentID in the table.Using the Table Article Properties in the Publications PropertiesDialog, I can see values of:Range Size at Publisher: 100,000Range Size at Subscribers: 100New range @ percentage: 80In my mind this means that the Publisher will assign a new range whenthe Current Indentity value goes over 80,000?The Identity range for this table cannot be exhausted! I'm not surewhat to try next.Please! any insight will be of great help!Regards,Bm
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May 26, 2015
What is the main difference between snapshot and transactional and merge replication?
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Jul 28, 2006
Hi,
I have a VB.net app that access a SQL Express database. I have transactional repliaction set up on a SQL 2000 database (the publisher) and a pull subscription from the VB.net app. I use RMO in the VB app to connect to the publisher. My problem is I am getting some strange behaviour as follows
- if I run the app and invoke the pull subscription it works fine. If I then close my app and go back in, I can access my data without any problem
- If I run the app and try to access data in my SQL Express database it works fine. I can then close the app, reopen it and run the pull subscription it works fine
however.......
- if I run the app, invoke the pull subscription (which runs fine), and then try to access data in my local SQL Express database without firstly closing and reopening the app, I get a login error
- if I run the app, try to access data in my local SQL Express database (which works fine), and then try to run the pull subscription I get a "the process cannot acces the file as it is being used by another process" error. In this case I need to restart the SQL Express service to be able to run replication again.
I get exactly the same behaviour when I use the Windows Sync tool (with my app open at the same time) instead of my RMO code to replicate the data.
I am using standard ADO.Net 2 code to access my SQL Express data in the app and closing all connections etc
Any advice appreciated !
Thanks
Ronan
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