CHAPTER 6 n MAINTAINING A WARM STANDBY SERVER VIA LOG SHIPPING 173
Clustering
Clustering is the use of two or more servers connected to a single copy of data. If one
node fails, another takes its place. On the surface, it??™s that simple.
Whereas log shipping focuses on moving a copy of the data to a remote location,
clustering seeks to ensure that the entire database instance will be available in the
event of a hardware failure. It requires no complex steps in the event of a failure and
no need to redirect clients manually to the standby server.
Instead of focusing on installation and configuration, I??™ll point out spots where
errors or missteps often occur. I won??™t provide step-by-step setup instructions or show
a number of screenshots that walk you through the process; that just isn??™t what this
book is about. Plenty of excellent books and articles out there deal with high availability
and clustering. I have no intention of reinventing the wheel; instead, I prefer to
point out how to repair a flat.
What interests me about clustering is how it fits into the overall disaster recovery
picture.
Pages:
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340