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When you are finished with the cursor, you should close it. The CLOSE statement to accomplish this is simple: CLOSE <cursor name>; In Listing 11-1, we close the city_cur cursor as follows: CLOSE city_cur; Closing the cursor removes the pointer from the data. If you don t issue the CLOSE statement, the cursor will remain open until your connection to the database is closed.

Although they are declared sequentially, the For loop and the sleep time ensure that the threads will try to compete for resources Comparing the outputs of the critical and noncritical sections makes the concept of critical sections clear If you observe the output from the NonCriticalSection() method, both the threads nt1 and nt2 are changing the variable result at the same time, thus resulting in a mixed output This is because there are no locks in the method NonCriticalSection() and thus the method is not thread-safe Multiple threads can access the method and in turn the global variable at the same time On the contrary, if you observe the output from the CriticalSection() method, it s clear that until the ct thread exits the critical section (MonitorEnter() and MonitorExit()) block, no other thread (ct2 in this case) is allowed access to the critical section.

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and services, you should disable this directive as it can skew the spread of the added service and hosts checks. Reenable it after the new objects have had their initial checks scheduled.

You can have multiple cursors within a single stored procedure, each with its own DECLARE statement. Tip

The Wait and Pulse Mechanism The Wait and Pulse mechanism is used for interaction between threads When a MonitorWait() is issued on an object, the thread that is accessing that object waits until it gets a signal to wake up MonitorPulse() and MonitorPulseAll() are used for signaling the waiting thread(s) The following listing is an example of how the Wait() and Pulse() methods work in WaitAndPulsevb..

Finally, the third directive in nagios.cfg is called max_concurrent_checks, which is a brute-force method of limiting the number of checks that can be run in parallel. By default this directive is set to 0, which does not limit the numbers of checks that can be run in parallel. You can specify the maximum number of checks to run in parallel. If you set this directive to 1, only one check will be conducted at a time. I recommend you do not do this to avoid the risk of choking your server by only allowing one check at a time. I believe that the smart scheduling methods provide the best way of scheduling checks.

You can have them opened at the same time and FETCH from them within the same loop, or in separate iterations at different points in your procedure or function. Be aware that the NOT FOUND condition will be met when any of the FETCH statements finds that it is at the end of the record set. There is no way to assign a condition to a specific cursor.

The PropertyInfo class provides access to property metadata. Table 8-9 provides the relevant properties of the class Table 8-9. PropertyInfo Class Properties

s You can also disable parallel service checking for an individual service using the parallelize_check Tip

We started the chapter with a scenario where you needed to process multiple records and move them to a set of other tables in your system, with the appropriate table for a row being decided by the data in the row. Now, let s see how you might solve this type of problem with a stored procedure and cursor. Sticking with the online store example we ve been using in previous chapters, suppose we have a login table that keeps track of when a customer logs in to our system. We use this information to keep a customer login history for statistics, as well as to record login information in

Returns the name of the property as a String Returns a Type object that represents the type of the property field Returns a Boolean stating if the property can be read Returns a Boolean stating if the property can be written to

directive in the service definition. If you do this, Nagios will halt all other activities to perform the service check. I do not recommend doing this as it can have a serious performance impact on your monitoring.

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