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Third-party clustering products are now being used by some to cluster SQL Server They generally use a completely different mechanism and approach than a standard SQL Server failover cluster Some are hardware-only Some are purely software-based Others are tied into both a hardware and a software solution in one way or another and act more like Microsoft s implementation, but they have a few features that companies may find desirable Some are widely used, others are up-andcoming They all work fairly well and as advertised, and you should do your homework to see if they will meet your needs The biggest issue with most of these products is that if you encounter a problem, the manufacturers will be the first point of contact not Microsoft since it most likely is not a Microsoftcertified solution.

public class CronTriggerExample { public static void main(String[] args) throws Exception { Scheduler scheduler = new StdSchedulerFactory().getScheduler(); scheduler.start(); JobDetail jobDetail = new JobDetail("messageJob", Scheduler.DEFAULT_GROUP, MessageJob.class); Map map = jobDetail.getJobDataMap(); map.put("message", "This is a message from Quartz"); String cronExpression = "3/5 * 14,15,16,17 * * "; Trigger trigger = new CronTrigger("cronTrigger", Scheduler.DEFAULT_GROUP, cronExpression); scheduler.scheduleJob(jobDetail, trigger); } } Much of this code should look familiar to you; the only major difference here is that we use the cron expression. The actual creation of the CronTrigger class is very similar to the creation of the SimpleTrigger class in that you have a name and a group name. To help you understand the cron expression in the example, we ll break it down into components.

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As a consultant, one of my biggest responsibilities to my customers is to identify risk and mitigate it I certainly cannot force a customer to use or not use a technology or a solution (Microsoft or non-Microsoft), but supportability is a concern since the last thing you want to hear from a support engineer is sorry, have a nice day when your system is down You know your organization better than I ever will You know what risks your business is willing to accept and what it won t tolerate As you go through the process of evaluating products, especially ones that would be a primary form of availability or disaster recovery, keep supportability in mind You should consult with those in the trenches the administrators who live, eat, sleep, and breathe your SQL Server administration and implementations.

To create the shared schedule in Report Manager, click Site Settings, and then select Manage Shared Schedules at the bottom of the page. Click New Schedule, and name the schedule End of Month Financials. In the Schedule Details section, you are presented with the standard scheduling options: Hour, Day, Week, Month, or Once. For this report, choose Month. The first challenge when configuring a shared schedule to run on the last day of each month is to overcome the built-in data validation on the Shared Schedule form. Although it is possible to tell SSRS to execute the report on the last Sunday of every month, it is not possible to select the last day of each month because the last day is variable (that is, it could be 28, 29, 30, or 31, depending on the month). Well, it should be possible to create a single schedule to encompass all four dates, right Not exactly. Choosing 31 causes an error when all the days of the month are selected, as shown in Figure 8-1, because not all months have 31 days.

The first component, 3/5, means every 5 seconds starting at the third second of the minute The second component, *, simply says every minute The third component, 14, 15, 16, 17, restricts this trigger to running between 2:00 and 5:59 pm that is, when the time begins with 14, 15, 16, or 17 The next two components are both wildcards saying that this trigger can run in any month or any year The final component uses the queston mark wildcard, , to indicate that this trigger can run on any day of the week This expression has the net effect of firing every 5 seconds, starting on the third second of the minute, but only between 2:00 and 5:59 pm If you run this example, depending on the time of day, you see either a blank screen or the ever increasing list of Hello, World printouts.

They will most likely be able to tell you if they have firsthand knowledge of the technology in question and whether the vendor you are considering is good You may have implemented another product from a vendor and had a bad experience, either with the technology, or worse, the support Know all of your facts before you spend a lot of money on something that could be the equivalent of a technology paperweight As noted in the chapters on clustering, for a geographically dispersed failover cluster solution, it is always best to consider solutions that are certified and appear in the Windows Server Catalog Any other solution no matter how reputable the vendor may cause you some support headaches down the road..

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