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This means Nagios has not fully determined that it is actually DOWN and is waiting until all the required checks have been performed before finalizing the state of the host When Nagios has completed all these retry checks and if the host still returns a DOWN state, then this state is now considered a hard DOWN state This indicates that Nagios now believes that the host is definitely DOWN and that a notification could be generated (if Nagios is configured to do that) If, however, the host recovers from the DOWN state and returns to an OK state during this period of checks, Nagios calls this a soft recovery The host never reaches the hard state and a notification is not generated This soft and hard state model helps reduce the number of potential false alarms..

node for the Web Tier Design category. Select the Web Tier Design category to see the following project types: Making Web Applications Accessible Client-side Validation Client Session State Handling Command Submissions Server-side Validation

while (rdr.Read()) { Debug.Print(rdr["EmployeeID"].ToString());

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The final directive, check_interval, controls how often Nagios performs checks of the host. In most cases you actually don t want to specify this directive at all. In fact, you don t want regular scheduled checks of our host. Why is this so Well, Nagios has some intelligence built in that only performs checks of the host when they are required. Let s look at how this works. Generally, you define a host to Nagios and then define the services and attributes of that host that you wish to monitor. Nagios checks these services and notifies you if anything untoward occurs or some condition you have defined is met. Nagios assumes that if a service it is monitoring on that host returns the OK state then the underlying host is also in the OK state. Nagios only checks the host if a service returns a non-OK state. Nagios does this so that it can eliminate the host as a cause for the service returning a non-OK state. It checks the host, and if the host also returns a non-OK state it continues to check the host until the maximum number of checks (as defined by the max_check_attempts directive) is reached or an OK state is received. At this stage the host is in a soft error state. If the host is found to be in a non-OK state after all these checks, then a notification will be generated (if this has been configured). The host is now in a hard error state.

Note The list of examples will most likely change with each version of NetBeans. New best practice

} } } } The SQL that is generated when using the SELECT VALUE is nearly identical to the SQL generated when using the SELECT. The one difference (see Listing 7-23) is that the [C1] cast seen in Listing 7-21 is no longer part of the query because the EF doesn t need this field. Listing 7-23. SQL Generated from the ESQL SELECT VALUE SELECT [Extent1].[EmployeeID] AS [EmployeeID], [Extent1].[NationalIDNumber] AS [NationalIDNumber], [Extent1].[LoginID] AS [LoginID], [Extent1].[Title] AS [Title], [Extent1].[BirthDate] AS [BirthDate], [Extent1].[MaritalStatus] AS [MaritalStatus], [Extent1].[Gender] AS [Gender], [Extent1].[HireDate] AS [HireDate], [Extent1].[SalariedFlag] AS [SalariedFlag], [Extent1].[VacationHours] AS [VacationHours], [Extent1].[SickLeaveHours] AS [SickLeaveHours], [Extent1].[CurrentFlag] AS [CurrentFlag], [Extent1].[rowguid] AS [rowguid], [Extent1].[ModifiedDate] AS [ModifiedDate] FROM [HumanResources].[Employee] AS [Extent1] WHERE [Extent1].[EmployeeID] = 1 So far, you have seen that ESQL supports both collection-based queries and item-based queries. ESQL also supports composite expressions, providing you with a mechanism for retrieving association entities. Listing 7-24 provides an example of a query with multiple expressions. In this example, you use a navigation property to retrieve the Contact entity data associated with the Employee entity. Because the EDM doesn t care about normalization, in most situations you can build multilevel ESQL expressions across entities, without using a JOIN.

s While Nagios performs this host check, all other service checking is suspended. This is because Tip

The check_interval directive is measured in minutes for example, a value of 10 as the interval would result in a check every 10 minutes. A setting of 0 will disable scheduled checking. Additionally, if you do not specify the check_interval directive at all, then Nagios assumes that you do not want scheduled host checking.

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