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You can configure databases and correspondingly the instances that host the data bases in three different roles. The publisher maintains the master copy of the data within a replication architecture. You configure the instance hosting the publisher database with the publication that defines the set of data to be replicated. The subscriber is the database that is receiving changes from the replication engine defined by the publication to which it is subscribing. A subscriber can receive changes from more than one publication. The distributor is the main engine within a replication architecture. The distribution database is stored on the instance that is configured as the distributor. In any replica tion architecture, the distributor is the location in which all replication agents will run by default. An instance of SQL Server can be configured as a distributor. A database can be con figured as a publisher, subscriber, or both.

A replication topology provides a process flow diagram that describes how data flows within a replication architecture.

Another common problem developers face is when to use T-SQL aggregate functions versus using middle tier code to perform aggregations. T-SQL aggregates can be very efficient when the bounds of the aggregation are known at design time; however, it is sometimes appropriate to aggregate data based on a variable. For example, the following code demonstrates a CLR aggregate that can aggregate data based on the value of a column:

A central publisher topology consists of a single publisher that has one or more sub scribers. The central publisher contains the master copy of the data and is used to set up the replication architecture. In this topology, data changes generally occur at a single source, the publisher, and flow down to one or more subscribers, as shown in Figure 11-1. A central publisher is the most common topology used in replication.

numbered trace log file as described in Lesson 4, and open the rolling trace. Filter the results by using the EventClass and SPID columns.

//C# using using using using using System; System.Data; System.Data.SqlClient; System.Data.SqlTypes; Microsoft.SqlServer.Server;

11

A central subscriber topology consists of a single subscriber that has more than one publisher. Changes are written to multiple publishers and then consolidated into a single subscriber, as shown in Figure 11-2. A central subscriber topology is normally used for consolidating multiple databases or as a central reporting database.

[Serializable] [Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.Native)] public struct DomesticSales { private double m_domesticSales;

You will find many different replication topologies documented in various resources, and each one is simply a permutation of either a central publisher or a central sub scriber. One topology that you will find is a bidirectional topology, which is noth ing more than two central publishers stacked together. It is not an actual topology; it is an architectural implementation of transactional replication. Two other topolo gies include central publisher with remote distributor and central subscriber with

Deadlocks can result in some queries executing very slowly and others failing to complete. Carry out the following practice:

remote distributor. These topologies are still a central publisher or a central sub scriber, respectively; where the distributor is located is a physical implementation issue and does not belong in a business process flow diagram.

public void Init() { m_domesticSales = 0; } public void Accumulate(SqlString Country) { if (Country == "USA") { ++m_domesticSales; } } public void Merge(DomesticSales Group) { m_domesticSales += Group.m_domesticSales; } public double Terminate() { return m_domesticSales; }

When starting work with replication, many people are confused by the way the repli cation engine reacts to various failure scenarios. After all, SQL Server does not under stand how to time out a transaction or how to retry an operation. The fundamental thing to understand about replication is that it is not a part of the core SQL Server engine at all. Replication operates externally to the SQL Server engine via a set of executables known as Replication Agents, which make the replica tion engine simply another application that is connecting to SQL Server and process ing data. Because it is an application, the replication engine is bound by and reacts the same way as any application that has to form an OLE DB connection to SQL Server.

<Serializable()> _ <Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.Native)> _ Public Structure DomesticSales Private m_DomesticSales As Double Public Sub Init() m_DomesticSales = 0 End Sub Public Sub Accumulate(ByVal Country As SqlString) If Country = "USA" Then m_DomesticSales = m_DomesticSales + 1 End Sub Public Sub Merge(ByVal value As DomesticSales) value.m_DomesticSales = m_DomesticSales