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The second directive in Table 2-9 is host_name. This is the short name of the host that the service resides on. You use the value of the host_name directive from your host definition as the value of this directive. You can specify multiple hosts that this service runs on by separating them with commas: host_name kitten.yourdomain.com,puppy.yourdomain.com,duckling.yourdomain.com

The most common type of cursor returned from a database is a cursor used for reading data. However, some cursors can make changes to the record where the cursor is currently positioned. The ability to write via a database cursor opens up a lot of additional options for your cursor use. With a write cursor, you could run a query, perform some logic on the fields in the query, and make updates to the fields in the record based on the logic. To do this same kind of thing from the client would take getting the entire resultset and then performing numerous updates on each row. MySQL cursors are read-only.

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Update the Account with the new balance 3 Send approval to the ATM End Sub End Class This next listing represents a thread-safe pseudo code version of the Account class: Class Account Sub ApprovedOrNot Withdraw (Amount) lock this section (access for only one thread) 1 Check the Account Balance 2 Update the Account with the new balance 3 Send approval to the ATM End lock End Sub End Class In the first listing, two or more threads can enter the critical section at the same time, so both threads might check the balance at the same time, with both threads receiving the balance ($1,000) of the account Due to this, the ATM might dispense the $1,000 amount to both users, causing the account to be overdrawn unexpectedly On the contrary, in the second listing, only one thread is allowed access to the critical section at any one time.

This directive indicates that the defined service will run on three hosts: kitten, puppy, and duckling. If you want to define a service that is present on all hosts, you can specify this by setting the host_name directive to * like so: host_name *

MySQL comes with cursor functionality in version 5.0 and later. As you would expect, MySQL has implemented a small core of cursor functionality that can accomplish a lot.

So, when Mr Smith s thread begins to execute the Withdraw() method, Mrs Smith s thread is not allowed access to the critical section and has to wait until Mr Smith s thread returns As a result, Mr Smith s thread checks the balance of the account, updates the account with the new balance, which is $0 in this case, and then returns the approval Boolean value (True in this case) to the ATM for dispensing the cash Until the cash is dispensed, no other thread has access to the critical section of Mr and Mrs Smith s Account object After Mr Smith receives the cash, Mrs Smith s thread enters the critical section of the Withdraw() method Now, when the method checks for the account balance, the returned amount is $0, the method returns a Boolean value of False indicating insufficient balance and the ATM denies the withdrawal..

The next directive, hostgroup_name, provides an alternative to specifying the host_name directive. This allows you to specify a group of hosts that this service runs on like so: hostgroup_name servers,aust_assets

Note MySQL developers have been pretty clear over the years that their primary focus is on developing

An alternative way to achieve thread-safety for an object is to make the object immutable. An immutable object s state can t be changed after the object has been created. This can be achieved by not allowing any thread to modify the state of the Account object after it is created. This

This directive tells Nagios that the service you are defining exists on all hosts in the host groups servers and aust_assets. You can specify a single host group, or as you can see, you can specify multiple host groups by separating them with commas.

features for use in production and building new functionality based on what database users are requesting. This leads to database feature implementations that are simple because they contain only what the user needs. It also keeps the amount of code in the database to a minimum for better performance, fewer bugs, and easier debugging when there are bugs.

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