SQL Server Replication Articles

Monitoring Transactional Replication – The Distribution Queue

Note : The scripts for this article can be downloaded here. Monitoring the distribution queue is an important link in the chain of transactions delivery over a replicated topology. A chain that includes the log reader agent scanning the published database’s transaction log for commands to be moved to the distribution database from which a […]

Manage and Monitor Identity Ranges in SQL Server Transactional Replication

Problem When using transactional replication to replicate data in a one way topology from a publisher to a read-only subscriber(s) there is no need to manage identity ranges. However, when using  transactional replication to replicate data in a two way replication topology – between two or more servers there is a need to manage identity […]

Transactional Replication – Violation of Primary Key Constraint

Recently, I encountered a case where the Transactional Replication between our Production OLTP server named XYZ and Reporting database server named PQR went out of sync. Both the servers were located in the same Data Centre in the USA. The Reporting database was used by the users in Canada for fetching the data from the […]

Transactional Replication – Unable to Replicate Data onto the Subscriber – A Practical Example

Scenario: A couple of days back, I got a call from one of my users saying that the Data is not being replicated properly onto the Production Reporting Server from the Production OLTP server. We have Transactional Replication scheduled for every 15 minutes between our OLTP and the Reporting server. Approach: I started investigating this […]

Replication Without Creating a Snapshot

In replication, the standard way of creating a publisher is to create a publication with a snapshot (which is what all the documentation recommends). However there are a few problems with this method: Creating the snapshots and then applying them is time consuming. Snapshots will consume disk space. There is an alternative to this, where […]

SQL Server Agent Alter Column Error

Replication Agent will fail when attempting to alter a column in the publisher which is part of an index. For example, let’s say you have table like following: CREATE TABLE [dbo].[Employees]( [ID] [int] IDENTITY(1,1) NOT NULL, [FirstName] [nvarchar](50) NULL, [LastName] [varchar](50) NULL, CONSTRAINT [PK_Employees] PRIMARY KEY CLUSTERED ( [ID] ASC ) ) ON [PRIMARY] And […]

Setting up Transactional Replication in SQL Server 2008 R2.

Setting up Transactional Replication in SQL Server 2008 R2. Replication is one of the High Availability features available in SQL Server. Transactional Replication is used when DML or DDL schema changes performed on an object of a database on one server needs to be reflected on the database residing on another server. This change happens […]