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We made this section of the query bold in order for you to tell which piece of the overall query is involved in the depth calculation The italicized part of the query shows the rollup adaptation from our query in Listing 8-26 Instead of counting the products, we ve simply used Product2Category to join to the sales information found in CustomerOrderItem and used the SUM function to provide some aggregated numbers..

3 "Status Events" Normal FORMAT A linkDown trap signifies that the SNMP entity, acting in $* SDESC A linkDown trap signifies that the SNMP entity, acting in an agent role, has detected that the ifOperStatus object for one of its communication links is about to enter the down state from some other state (but not from the notPresent state) This other state is indicated by the included value of ifOperStatus Variables: 1: ifIndex 2: ifAdminStatus 3: ifOperStatus EDESC In Example 9-22 you can see the translated trap is broken down into three sections: the EVENT and FORMAT lines and the information between the SDESC and EDESC directives that mark the start and end of a description of the trap Later in this section I ll add another line, the EXEC statement, that will send the trap to Nagios.

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Note Notice that the query from Listing 8-27 shows only 10 results But there are 14 categories. As an

There is also a distinction between single-user systems and multiuser systems. A multiuser system in this sense involves multiple clients interacting with each other simultaneously in real time via a central server. Multiuser systems are intrinsically session-oriented because some kind of state must be held by the server on behalf of the various clients for any interaction between them to be meaningful. They are also typically asynchronous in nature. A typical example of such a system is a teleconference as shown in the following diagram.

The first directive, EVENT, is structured like so: EVENT event_name event_OID "category" severity The event line is broken down into the name of the trap and the OID number These are followed by the category of the trap and the criticality of the trap The category of the trap is the type of event, and there are also two special categories of trap: LOGONLY and IGNORE If the category of the trap is set to either of these special categories, SNMPTT will not execute the EXEC statement If you translate a trap and the category is set to either of these options, you will need to change it to allow the trap to be sent to Nagios The FORMAT line is used to create the text that is logged by SNMPTT to syslog or to a file It is very similar to the EXEC line I ll add shortly.

exercise, rewrite the query in Listing 8-27 to use an outer join to include the categories that have no product sales. Use the techniques you learned in 7.

In this kind of system, one client talks to all the others via a central server. Such a system is asynchronous and session-oriented. In fact, any system in which users can interact with each other in real time is session-oriented.

What happens to our nested set model when we need to insert a new category into our catalog Clearly, our model depends on the left and right side metadata about each category To keep our model from breaking, we need to update this metadata when our tree changes Luckily, we have our rules from which we can derive a node-insertion strategy When you re inserting nodes into the tree, you must first decide what the parent of the new node will be where will the node be inserted Once you know which node is the parent, you can then update the metadata for all nodes according to the right side value of this parent Let s assume we want to add under the Video Games category a new category called Puzzle Video Games.

It can contain text and a number of possible variables, such as the hostname and IP address of the device generating the trap You can see a full list of these variables in the SNMPTT documentation at http://snmpttsourceforge net/docs/snmpttshtml#Variable-substitutions I ll also look at some of these variables here..

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