Solved

SQL replication locking

Posted on 2014-04-28
4
284 Views
Last Modified: 2014-05-11
We have transactional replication in place that only replicates changes and not entire sets of tables every time.  Furthermore, we are specifically pushing data from the Publisher every 1 hour.  My subscriber seems to be holding onto tables, please see attached, and as a result – SQL job drags out a long time (it reads from replicated tables and does data tabulation.)  All documentation on this states that replication doesn’t lock replication tables, however, it seems to be creating connections to updates and not closing those efficiently.   We are publishing from 2012 and to 2008 subscriber over a WAN.

I cannot find any concrete information of replication blocks, so I’m thinking it is something that is manageable/configurable.  In attached png my process is 60 and process 62 suspended it.  I read about transactional replication and that Snapshot Agent only locks tables on initial snapshot replication, not any concurrent ones.  Should this be happening?

Should I put in place an implementation of read committed isolation that uses row versioning when the READ_COMMITTED_SNAPSHOT database option is ON? Or do Snapshot that is enabled when the ALLOW_SNAPSHOT_ISOLATION database option is ON?
rep.png
0
Comment
Question by:menreeq
  • 2
4 Comments
 
LVL 8

Expert Comment

by:ProjectChampion
ID: 40029096
Transactoinal replication in SQL Server is pretty clever and since 2008 (or perhaps even 2005) reliability and resiliency has been improved significantly.

Based on what you've described, I'd suggest you to check to see if there is a heavy job, such as a bulky report, ETL operation or perhaps maintenance plan (index rebuild, backup, database integrity check etc.) which might be clashing with your replication.

Having said that I've had no problem with replication going on simultaneously with the maintenance jobs, but in my case replications where continuous not scheduled. Is there a reason why you don't allow continuous replication instead of every hour? If you let the transactions replicate in smaller chunks the probability of the above mentioned clashes will be much lower.
0
 
LVL 39

Expert Comment

by:lcohan
ID: 40038169
" My subscriber seems to be holding onto tables, "

You should check Locks/Blocks on the subscriber side and I recommend using SQL own Performance Dashboard for that or sp_locks on the Subscriber SQL.

The fact that you replicate over a WAN can also be the reason why "SQL job drags out a long time ..."
0
 

Accepted Solution

by:
menreeq earned 0 total points
ID: 40044727
We solved the issue by moving the DB from 2012 to 2008, once we were replicating from 2008 to 2008 it worked like a champ.  Thanks for the help.
0
 

Author Closing Comment

by:menreeq
ID: 40057065
Figured it out
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
Ever wondered why sometimes your SQL Server is slow or unresponsive with connections spiking up but by the time you go in, all is well? The following article will show you how to install and configure a SQL job that will send you email alerts includ…
Familiarize people with the process of retrieving data from SQL Server using an Access pass-thru query. Microsoft Access is a very powerful client/server development tool. One of the ways that you can retrieve data from a SQL Server is by using a pa…
Using examples as well as descriptions, and references to Books Online, show the different Recovery Models available in SQL Server and explain, as well as show how full, differential and transaction log backups are performed

786 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question