barcode generator dll c# Figure 3 9. A log-shipping scenario in Visual Studio .NET

Painting Quick Response Code in Visual Studio .NET Figure 3 9. A log-shipping scenario

Figure 3 9. A log-shipping scenario
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Just how long would you be able to go without data Would it be acceptable to tell your end users that they would be without their data for the past ten or fifteen minutes And if you did transaction log backups every minute, are you certain they would complete in that minute Depending on the usage and activity, you could find your transaction logs taking longer than one minute to complete their backup, meaning it would take some
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CHAPTER 3: Some Basics
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time to do the file copy, and then longer than a minute to do the restore. What does that mean for the jobs that keep trying to do the backups and restores every minute They fall behind, that s what it means. And if they fall too far behind, you will find yourself having to reinitialize everything from scratch. And depending upon the size of the files and databases involved, that could make for a long afternoon and evening. But for a lot of people, log shipping is the way to go. Log shipping doesn t require a SAN or identical hardware on each server involved. A lot of vendors will recommend log shipping as a way to achieve HA with a fairly low amount of overhead. You do not necessarily save on costs when compared to clusters, but you do save on overall administration costs, because things like service packs and hotfixes are easier to implement, as well as installation of vendor software. Be mindful that log shipping requires manual intervention. Unlike clustering, which can provide you with an automated failover, log shipping requires a human to get involved and to manually get the backup server up and running as a production server.
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Replication
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You will often be involved in conversations about replication. My first word of caution is to make certain that everyone understand what type of replication is being discussed. You have two main types of replication to be concerned with: SQL replication and SAN replication. They are not the same thing in fact they are very different, and can exist together or separately depending on your needs. SAN replication is simply a way your shop has configured the SAN to accommodate for moving bits of data from point A to point B. This is done primarily for HA purposes, but you will find someone who thinks it is also being done for DR purposes. Depending on how the SAN replication is configured, it most certainly is an HA option and is possibly a DR option. For example, if you have two sites and are doing SAN replication from site A to site B, then you certainly have an HA scenario configured. However, when an event happens that affects both site A and site B, both SANs will go down. Your HA is clearly going to be out of the water, and so will your DR unless you are also replicating to a third site. I can hear people now saying that they can recover from tape, so technically they have a DR solution in place. And I will tell them the same thing I am telling you right now: then your tape backups are your DR solution, not your SAN replication. I hope that helps clear up the confusion. As for SQL replication, you get your choice of flavors. Each one is unique from the rest, and each appropriate according to your particular needs. You should have a cursory knowledge of the different types and when it might make sense to deploy. Your environment and the nature of the requirements you are given will be your primary decision factors when selecting a mode of SQL replication. Before we even get started, a quick overview of replication terminology is in order. Many of the terms used (publisher, subscriber, distributor) are used in the publishing industry,
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