SQL Server replication works well on a low latency, high bandwidth network. When actual networks have high latency or limited bandwidth, problems may occur. Such conditions can be emulated with hardware or software tools. You can quickly set up a test environment to emulate high latency and limited bandwidth by using free, open source software. … Read more
In the last few years, GoldenGate has become the preferred choice for DBAs to handle the replication requirement of their data centers. Besides being extremely easy to configure, GoldenGate offers immense flexibility in the configuration strategies available with it. This series of articles will discuss GoldenGate technology, covering concepts, configuration options, troubleshooting and so forth. The Scenario Imagine you ar… Read more
A Hyper-V replica installation provides rapid disaster-recovery by asynchronously replicating a VM running at a primary site to a replica site. Know how to prepare for something to go wrong at the Primary Server/Site? In this article Nirmal Sharma presents the Replication options for a Replica Virtual Machine with a focus on Hyper-V Failover.
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Fundamentals of SQL Server 2012 Replication provides a hands-on introduction to SQL Server replication. The book begins with a short overview that introduces you to the technologies that make up replication. In the following chapters, the book will walk you through setting up different replication scenarios. … Read more
High Availability (HA) and Disaster Recovery (DR) can be provided for subscription databases from an AlwaysOn Avaliability Group, but the secondary replicas will need to be manually configured to create the new subscriptions… Read more
SQL Server 2012 AlwaysOn Availability Groups provide a high-availability and disaster-recovery solution for you SQL Server 2012 environments. Replication has been around in SQL Server for quite some time and allows you to scale out your environment. Warwick Rudd explains how to join these technologies together
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Although, generally speaking, source control is the truth, a database doesn't quite conform to the ideal because the target schema can, for valid reasons, contain other conflicting truths that can't easily be captured in source control. Dave Ballantyne explains the problems and suggests a solution.… Read more
Cluster continuous replication (CCR) uses log shipping and failover to provide a more resilient email system with faster recovery. Once it is installed, a clustered server requires different management routines. These are done either with a GUI tool, The Failover Cluster Management Console, or the Exchange Management Shell. You can use Powershell as well for some tasks. Confused? Not for long, since Brien Posey is once more here to help. … Read more
Cluster continuous replication (CCR) helps to provide a more resilient email system with faster recovery. It was introduced in Microsoft Exchange Server 2007 and uses log shipping and failover. configuring Cluster Continuous Replication on a Windows Server 2008 requires different techniques to Windows Server 2003. Brien Posey explains all. … Read more
Imagine that you're researching Continuous Cluster Replication, looking for a simple, direct guide to the basics of getting it set up and running. What do you do if everything you find is either too specialised, or goes into far more detail than you need? If you're Brien Posey, and you can't find that practical, to-the-point article, you roll up your sleeves and write it yourself. To kick off, he tackles the rather tedious task of setting up a Majority Node Set Cluster.… Read more
Cluster continuous replication (CCR) is a means of providing a more resilient email system with faster recovery. It was introduced in Microsoft Exchange Server 2007 and uses log shipping and failover. The host-name feature of Exchange 2007 Service Pack 1 and the use of multiple redundant private network interfaces can improve the effectiveness of CCR.… Read more
For everything you need to know, rather than want to know, about SQL Server Reporting Services, replication, backup, XML, performance, data warehousing and more..… Read more
In the first of a series of Database Maintenance Tips and Tricks, Alex Kozak discusses some general issues surrounding disk space requirements for SQL Server databases and shows how to estimate Disk space usage and requirements. He gives tips on using DBCC CHECKDB consistency check and for estimating the space required for replication. … Read more
Prasanna is reminded of pizza in cardboard boxes when he explores the possibilities of Synchronization Services for ADO.NET. Data applications are becoming increasingly mobile, and often disconnected, and data is often wrapped up to be consumed later. Miccrosoft's Merge Replication was their first, and most heavyweight, solution, but now comes a different tack, based on SQL Server 2008 and ADO.… Read more
The original, rather complex, Exchange clustering, 'Single Copy Cluster', protects you against a server failure but not a database failure. 'Local Continuous Replication' protects you from database failure, but not server failure. The more simple 'Clustered Continuous Replication' protects against both. If you use it with Transport Dumpster, you won't lose emails.… Read more
Neil Hobson writes about the ways that MS Exchange 2007 can ensure that your organisations messaging remains available. He looks at the way that the Mailbox Server role can be made more available using features as Single Copy Clusters, Local Continuous Replication, and Clustered Continuous Replication. He also discusses ways of improving the resilience of the other server roles.… Read more
This article discusses three common problems DBAs are likely to encounter when columns have an identity property that will auto-increment its value when data is inserted. These problems are humorously referred to as the identity crisis.
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