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The two major types of cursors are server-side cursors and client-side cursors. Server-side cursors let you open a cursor in code that is run inside the database. You are not able to send the cursor, or a pointer to control the cursor, to an external client for interaction with the database. Server-side cursors are opened, used, and closed from within a routine inside the database. The cursor is opened and closed without any interaction with an external client, other than calling the procedure that may use a cursor internally. A database system that allows client-side cursors provides the ability to open a cursor from a client outside the database (for example, in your application) and have the database return the cursor to the external client for control. Where client-side cursors are in use, you will see the client or application make a query to the database that asks for a cursor, instead of the record set, in the return. The client gets the cursor from the database, and then uses logic built into the application to control the cursor s movement, retrieval, and modification of data. Once the application has finished, it is expected to close the cursor. MySQL offers only server-side cursors.

There are at least three ways to make an object thread-safe: Synchronize critical sections within the code. Make the object immutable. Use a thread-safe wrapper.

Description of the service Name of the host(s) that the service runs on Alternative to host_name that allows you to specify one or more host group that this service runs on Service group or groups that the service belongs to Contact groups that should be notified for this service

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Depending on the database, control over the movement of the cursor varies. In its simplest form, a cursor moves forward one record at a time and gives you no control over the direction or spacing of the movement. More sophisticated implementations will allow you to move the cursor both forward and backward. Beyond the ability to move backward is the capability to skip to certain records, based on either a record number or a position relative to where the cursor is currently positioned. It s also common to see a command to move the cursor back to the first or forward to the last record. MySQL cursors are of the forward-only type.

To avoid undesirable effects caused by multiple threads updating a resource at the same time, you need to make the resource thread-safe by restricting the resource so that only one thread can update the resource at any point of time. The most straightforward way to make an object or an instance variable thread-safe is to identify and synchronize their critical sections. For

The first directive, service_description, is the name of the service you are defining. It needs to be unique for the host it is defined on. In other words, there can t be two services on the one host with the same service description. Nagios uses the combination of hostname and service description to uniquely identify the service. The description field can include spaces, dashes, and colons, but you should avoid other special characters, including quotation marks, semicolons, and apostrophes, since they can make it difficult to use the service description field as a macro in commands.

You might wonder exactly where the cursor resides and what data it s using when you re scrolling around. The SQL standard specifies that cursors can be either insensitive or asensitive. An insensitive cursor is one that points at a temporary copy of the data. Any changes in the data while the cursor is open are hidden from the cursor, because the cursor is looking at a snapshot of the data taken at the time the cursor was requested. The snapshot of the data sticks around until the cursor is closed. An asensitive cursor points at the real data, not a cached or temporary copy. A cursor that points at the actual data becomes available faster than an insensitive cursor, because the data doesn t need to be copied to a temporary place. However, when using a cursor that points at the actual data, changes in the underlying data from another connection may affect the data being used by the cursor. MySQL cursors are asensitive.

example, in the preceding ATM scenario in which Mr Smith and Mrs Smith both try to access the same Withdraw() method at the same time, the Withdraw() method becomes the critical section and needs to be thread-safe The easiest way to do this is to synchronize the method Withdraw() so that only one thread (either Mr Smith or Mrs ) can enter it at any one time A transaction that cannot be interrupted during its execution is called atomic Making the Withdraw() method atomic ensures that no other thread can check the balance of the same account until the first thread has finished changing the state of the account (to empty in this case) The following code listing is a pseudo code representation of a nonthread-safe Account class: Class Account Sub ApprovedOrNot Withdraw (Amount) 1 Make sure that the user has enough cash (Check the Balance) 2.

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