Combining Transactional And Snapshot Replication

Feb 2, 2004

Hi

I am in the process of setting up replication between two SQL boxes - the first being the production SQL Server and the second being a secondary server which is to be used as part of a web portal solution. (In fact there are two pairs of SQL boxes - SQL 7 and SQL 2k, one of each on the LAN and one of each at the hosting site.)

We need to have near realtime replication, so transactional replication is the desired mechanism. The trouble is that not all tables have primary keys defined. Oh yes, and the main database is 20G in size and has >900 user tables! :-0 (The other databases are much better behaved!)

When I set up transactional replication, I am allowed only to include tables which have PKs defined. AFAIK, the initial transactional replication snapshot will also only include these same tables.

If I set up snapshot replication (separately), I can include all the tables in the database. However, I cannot then replicate in real time.

Can I combine the two replication schemes to deliver updates to the same target database:
- transactional replication delivering realtime updates to the tables with PKs during the day and
- snapshot replication updating all the tables once per 24hrs at night?

Or is there a better way of doing this?

I am not sure whether I can modify the existing schemas, as some of the databases are 'maintained' by an external provider. Even if I could, if I had to add a column to have a PK, I would potentially be adding to my diskspace requirement rather significantly...

TIA

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Combining Peer-to-Peer Transactional Replication With Standard Transactional Replication

Dec 1, 2006

Hello,

I'm interested in combining the Peer-to-Peer Transactional Replication and Standard Transactional Replication to provide a scale out solution of SQL Server 2005. The condition is as follows:

We may have 10 SQL Server 2005 (1 Publisher + 9 Subscriber) running transactional replication in the production environment and allow updates in subscribers. To offload the loading of the publisher, we plan to have 2 Publisher (PubNode1 and PubNode2) using Peer-to-Peer Transaction Replication and the rest 8 subscribers will be divided into 2 groups. The subscribers 1-4 (SubNode1, SubNode2, SubNode3, and SubNode4) will be set to be standard transactional replication subscribers of PubNode1, and the rest 4 subscribers (SubNode5, ..., SubNode8) will be set to be standard transactional replication subscribers of PubNode2.

Is it possible to setup above 2 Publisher + 8 Subscriber topology?
Also, could we set the 8 subscribers with updatable subscriptions to achieve each node is updatable?

We do not plan to set all the 10 nodes using Peer-to-Peer Transactional Replication as it is necessary to make sure n*(n-1)/2 (i.e. 45) peer-to-peer connections is reliable. It seems that the maintenance cost is high if the servers are not in a LAN and the topology is very high coupling. So we prefer to divide the 10 nodes into 2 groups and reduce the cost of each node to maintain the connections to all other sites.

That's the scenario.

Any feedback is welcome and appreciated.

Thanks,
Terence

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Transactional Replication And Snapshot Schedule

May 21, 2002

I've set up Transactional replication Pushed from SQL 7 to SQL 2000. All works fine accept I have noticed that the snapshot agent is running once a week and storing a lot of data I don't really need in c:msql7
epldataunc
eplicationnamedatastamp. This is gradually building up and as C is a smallish partition it'll only survive for another week.

My questions are:
1) Can the Snapshot schedule be disabled? I'm under the impression that it's only required when a new subscriber comes along which is never! If I do need a new subscriber I could just manually produce another snapshot.

2) Can I delete the previous snapshot folders under ReplData? On a development server I renamed one of the folders and the ground didn't open up below my feet.

3) What effect would changing the working folder used by the distribution agen have, the distributer is on the publisher (which as I mentioned is pushing) I've tried changing the working folder, on a development server, I manually ran a snapshot which whose BCP files all ended up in my new location and the Transactional Replication didn't seem to care.

I've looked in a few places for a difinitive answer and I'm not having much luck so any help (preferably before saturday) would be greatly appreciated.

Regards.

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Jun 27, 2007

Why would you schedule a Snapshot Agent to run daily, weekly, monthly, etc. for Transactional replication when the transactions are replicated once the change is committed to the Publication database?



Does this help to replicate DDL against the Subscriber?



Thanks,

Thomas LeBlanc

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Transactional Replication- Snapshot Agent

Sep 7, 2006

When you create a transactional Replication.Is there a way to disable to snapshot agent scheduler. I believe that there is a way to disble it when you create a publisher.



Help ME!!!!!!!!!!!!!!!

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Mar 27, 2007

Hello,

We are running transactional replication in a high volume environment and we are starting to see high IO on the distribution database when the distribution cleanup runs. We only build the snapshot once a week and I was wondering if I rebuilt the snapshot more often it would reduce the size of the distribution database and the amount of IO that are being generated during the cleanup?



Thanks in advance

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Alternate Snapshot Location For Transactional Replication

Jun 2, 2006

Hi,
I have transactional replication setup with SQL 2000 on W2K3 cluster using updateable push subscribers. While setting up replication, we chose default location for snapshot folder that resides on non-clustered drive. Is there a way to change this location without disturbing current replication setup. I looked at the 'alternate snapshot location' solution, but it requires snapshot re-initialization. I am trying to do this with minimal effort and downtime.
Thanks,
np70

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Transactional Replication - Automating A Regular Snapshot

Feb 13, 2004

I have transactional replication running. I would like the Snapshot Agent to run regularly (once per day, probably, at 23:00) so that the target data are completely refreshed so that there is little possibility of the target getting out of sync.

The Snapshot Agent's job is kicking off OK, but the "snapshot was not generated because no subscriptions needed initialization". I know I can initialise the subscriptions manually - is there a way to do this so that the initialisation happens just before the snapshot job launches?

Or is this a bad thing to want to do?

TIA

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Initializing Transactional Replication Without A Snapshot In SQL 2000

Nov 10, 2006

SQL Server 2005 Books Online provides an article entitled, "Initializing a Transactional Subscription without a Snapshot". Is it possible in SQL Server 2000 to initialize transactional replication without a snapshot?

So far, I have been unable to find a similar procedure mentioned in the SQL 2000 Books Online. I was able to follow the 2005 procedure using SQL 2000 until I got to the step that says to enable the "Allow initialization from backup files" option on the "Subscription Options" tab of the "Publication Properties" dialog. But that option does not appear in the SQL 2000 version of the specified dialog box.

Any ideas?

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Do I Really Need A Snapshot (to Initialize Transactional Replication, In SQL2000)?

Feb 20, 2006

I have a pretty big (350 gb) OLTP database that I want to replicate in its entirety. I'm concerned about the impact of taking a snapshot of it (it is processing at some level pretty much 24x7). I know on SQL2005 there is the option to initialize from backup, but unfortunately we won't be on 2005 in time.

I'm thinking of doing something like this:

Set up the distributor, publication, and subscription
Turn off distribution agent
Set the publisher to "sync with backup"
Backup the publisher, full then log
Truncate tables MSrepl_transactions and MSrepl_commands in the distribution db (I don't have any other replication going on)
Turn off "sync with backup"
Restore the full and tran log backups to new subscriber db
Create subscriber stored procs in subscriber
Start up distribution agent

I'm looking for opinions on whether it's worth going this route to avoid taking the snapshot. Data integrity is the number one priority -- if I have to do a snapshot to ensure that, I will do it.

Thanks in advance!

Mike

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Apr 9, 2014

I built a number of publications on a SQL Server 2005 box to replicate to a SQL Server 2012 subscriber. All the publications except one are fine. During the snapshot phase of schema script generation I get Script Failed for Table 'dbo.MediaDisplayLibraryFileData'. From the Replication monitor for the Snapshot Agent on the Publication I get, "Column FileData in object MediaDisplayLibraryFileData contains type VarBinaryMax, which is not supported in the target server version, SQL Server 2000." This message makes no sense since the target server version is 2012. I have even checked that the compatibility level was set to 110 before I started the process of setting up replication. How do I resolve this error?

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SQL Server 2008 :: Transactional Replication (Snapshot Agent)

Mar 19, 2015

Is there a way to force the snapshot to use a format file when bcp'ng the data to the subscriber?

The publisher and subscriber schemas are slightly different. Mainly added columns to the subscriber.

We have a post snapshot script that updates these additional columns on the subscriber.

I'd like to force the snapshot to use a format file, so it doesn't error when initially loading the data to the subscriber.

Is this possible?

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SQL Server 2008 :: Transactional Replication Snapshot In Multiple Files

Sep 15, 2015

We have a large database with a small number of large tables in it (and a larger number of SMALLER tables), and it is a publisher for a transactional replication scenario. When I create a snapshot to initialize a new subscription, I notice with the larger tables that sometimes it generates multiple files in the snapshot folder, usually in multiples of 16, and numbers them like this:

MyTable_3#1.bcp
MyTable_3#2.bcp
...
MyTable_3#16.bcp

With other tables, I'll get just one LARGE snapshot file, named:

MyOtherTable_4.bcp

In the latter case, the file can be very large (most recent is 38GB).

In both cases, the subscription will eventually be initialized, but the smaller files will generate separate log entries every few minutes in the Replication Monitor, showing 'Bulk Copied data into 'MyTable' (34231221 rows)', whereas the larger table will generate only ONE log entry, showing 'Bulk coping data into table 'MyOtherTable', and it may take a couple of hours before there is anything else showing...except for an entry saying, 'The process is running and is waiting for a response from the server.'

My question is: what would be the difference between the two tables that would result in one generating MULTIPLE snapshot files, the other only a single, much larger one? The only difference I can see in the table definition is that the one generating multiple files has a clustered index, whereas the others do not.

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SQL Tools :: Script To Monitor Server Transactional And Snapshot Replication

Apr 28, 2015

Any TSQL script to monitor replication(Transactional, Snapshot) with current status ? I have tried below script but it giving error.

"Msg 8164, Level 16, State 1, Procedure sp_MSload_tmp_replication_status, Line 80
An INSERT EXEC statement cannot be nested."

DECLARE @srvname VARCHAR(100)
DECLARE @pub_db VARCHAR(100)

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Transactional Replication - Pull Subscription Snapshot Being Applied Continuously

Jan 25, 2007

Hi

We have setup transactional replication between 2 databases on SQL Server 2000 SP3a  (~70GB), using a concurrent snapshot (to prevent locking out of the live database) to initilaise the data and a pull subscription from the second database.

From analysing the msdistribution_history table in the distribution database on the subscriber it appears that the snapshot is being applied in a continuous loop to the subscriber database. Viewing the comments column in the msdistribution_history table we can see the following sequence of events occuring

Initialising
Applied script 'snapshot.pre'
Then it applies all the schema files .sch
Then it applies all the index files .idx
The it bulk copies the data in (bcp)
Then it creates the Primary Keys
Then it applies all the trigger files .trg
Then it applies all the referential integrity files .dri

These all complete successfully but then the process kicks off again immediately after reapplying the snapshot.  We are unaware of any settings that may be causing this.

Any help on what maybe causing this would be much appreciated.

 

 

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Oct 22, 2015

There is a SQL Server 2008 R2 SP3 Clustered Instance that has Transactional Replication. It is by no means a large replication setup in terms of data/article count. SQL Server was recently patched to SP3 and is current on Windows 2008 R2 Patches.

When I added a new article to replication (via 2014 SSMS GUI) it seems to add everything correctly (replication tables/procs show the new article as part of the publication).
The Publication is set to allow the snapshot to generate for just new articles (setting immediate_sync & allow_anonymous to false).

When the snapshot agent is run, it runs without error and claims to have generated a snapshot of 1 article. However the snapshot folder only contains a folder for the instance (that does have the modified time of the snapshot agent execution) and none of the regular bcp/schema files.

The tables never make it to the subscribers and replication continues on without error for the existing articles. No agents produce any errors and running the snapshot agent w/ verbose output provides no errors or insight into any possible issues.

I have tried:

- dropping/re-adding the article in question.

- Setting up a new Snapshot Folder

- Validated all the settings and configurations

I'm hesitant to reinitialize a subscriber since I am not confident a snapshot can be generated. Also wondering if this is related to the SP3 Upgrade, every few months new articles are added to the publication and this is the first time since the upgrade to SP3 that it has been done.

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Feb 6, 2015

I am very new to SQL coming from a SAS background.

I work at a College where I am trying to create a table that basically stores application data so that I can record how many applications we had on a set day.

For example I want to run it say bi-weekly and create a date/time stamp for each row and then the next time it runs it appends to the original table but with the new date/time stamp.

I have managed to create the table and the date/time stamp but I'm not sure how to do the next stage.

This is not the best practice as the table will get "big" quite quickly (although we're only dealing in the hundreds in terms of rows). Ideally I'd have a more transactional database that only appends a record if there is a change i.e. the status of the application has changed from "Received" to "Interview" or similar.

I'm not sure how to copy and paste the code dynamically in this forum but this is what I have got so far (see below).

SELECT
CC.cc_name as Academy,
SUBSTRING(CC2.cc_reference,1,4) as Cost_Centre,
MD2.m_reference as Course,
MD2.m_name as Course_Name,
CAST(MD2.m_start AS DATE) as Start_Date,

[Code] ...

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Sep 15, 2005

Hi,

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Sep 13, 2007

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May 26, 2015

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Sep 2, 2015

I have been researching on the proper steps or sequence to follow to completely remove SQL Server 2012 Transactional Replication.  I have read articles about using SSMS as well as using replication stored procedures and some procedures use SQLCMD or just regular TSQL executed in SSMS.  I have also read articles where people said all you really need is connect to the Publisher instance, find the publication you want to remove and choose "Delete" and everything will be taken care of behind the scene. I have three SQL servers that participate in transactional replication.  SQL-P (publisher), 

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Example...
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thanks...

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Jul 30, 2001

On my distribution server there is a directory called mssql7
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Dec 28, 2000

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Thanks!
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Feb 13, 2001

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Nov 1, 1999

I have two servers networked via workgroups (no domain) and am trying to install Transactional Replication. Everything appears to install correctly, but when I run the initial Snapshot Agent I get the following error -

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Hi guys can anyone help me with this issue. if so thankyou kindly.

1. created transactional publication (for tables, stored procs & views )
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4. ran the initial snapshot agent at the publisher
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? Could it be that it is not picking up the primary keys on the tables because I am replicating stored procs and views with that publication?

? Should I break my publications into 3; say 1 for each object?

Thank you guys for taking the time to read this.

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