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If the query refers to the data that might have been changed and committed in the recent past, after the query has started, the query must get the past image, not the image now, even though it is committed If the query finds that the past data is no longer available, it throws the dreaded ORA-1555 Snapshot Too Old error Anyway, what does the ORA-1555 error have to do with flashback operation Plenty Since the past image of the data is available in the undo segment for a while, why should a longrunning query be the only one to have fun You can benefit from that past image too That thought gave rise to flashback queries in Oracle9i Database where you could query data as of a time in the past.

The References tab of the My Project namespace allows you to select any number of namespaces that should be automatically imported into each *.vb file within your current project. If a namespace is selected in this manner, you are not required to explicitly import the namespace using the Imports keyword.

The event log entry will contain the instance ID, but it will call it the Event ID property This discrepancy comes from the fact that Event ID is the obsolete name of the instance ID property Figure 22-1 shows a sample view of a logon event Note that the 4648 event that we are using here is a security audit event; its source is SecurityAuditing Windows Vista has its user logon auditing turned on by default, but you may need to enable it on your system..

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Before we build our first official code library, there is one final aspect of the Imports keyword I d like to point out. In our current example, you may have noticed that we have two classes named SomeClass, one defined within MyCodeLibrary and the other within MyCodeLibrary.MyTypes. Surprisingly, if you wish to make use of the SomeClass defined within MyCodeLibrary, you are not required to add any

In Oracle Database 10g, that functionality was made richer with flashback version queries, where you can pull the changes made to the row data from the undo segments, as long as they are available in the undo segments, of course And, when you pull the older versions of the table, you can effectively reinstate the entire table to a point in time in the past using these past images This is known as flashing back the table In this chapter, you will learn to use all three types of flashback technology..

additional Imports statements. Given that Class2 is defined within the MyCodeLibrary namespace, the compiler assumes you are requesting the SomeClass within the shared namespace scope: Imports MyCodeLibrary.MyTypes.MyEnums Public Class Class2 Public Sub MySub() Dim e As TestEnum ' This is really MyCodeLibrary.SomeClass Dim s As New SomeClass End Sub End Class However, for the sake of argument, what if you wished to make use of the SomeClass defined within MyCodeLibrary.MyTypes You might think that you would simply add an Imports statement for MyCodeLibrary.MyTypes, as follows: Imports MyCodeLibrary.MyTypes.MyEnums Imports MyCodeLibrary.MyTypes Public Class Public Sub Dim e As ' This Dim s As End Sub End Class Class2 MySub() TestEnum is STILL MyCodeLibrary.SomeClass New SomeClass

The data dictionary view V$DATABASE contains information about the flashback status of the database. Check the column FLASHBACK_ON on that view to ascertain the flashback status: SQL> select flashback_on from v$database; FLASHBACK_ON -----------------YES The output shows that the value of the column FLASHBACK_ON is set to YES, which means the database is running in flashback mode. If the database is not in flashback mode, the query would have returned NO.

Figure 22-1. An event log entry showing a Logon audit event (Event ID = 4648) Finally, here is the script, WatchEventLog.ps1, that listens for the event: Add-PSSnapin PSEventing -ErrorAction SilentlyContinue $securityLog = New-Object System.Diagnostics.EventLog "Security" $securityLog.EnableRaisingEvents = $true Connect-EventListener securityLog EntryWritten $logonAttemptEventInstanceID = 4648 Get-Event -wait | ` where { ` $_.Args.Entry.InstanceID -eq $logonAttemptEventInstanceID } | ` foreach { ` Write-Host -foreground Red ` "Logon attempt at: $($_.Args.Entry.TimeGenerated)" } Disconnect-EventListener securityLog EntryWritten $securityLog.EnableRaisingEvents = $false

However, s is still of type MyCodeLibrary.SomeClass (this can be verified using ildasm.exe)! To inform the compiler you explicitly wish to have the SomeClass defined within MyCodeLibrary.MyTypes, you can either use fully qualified names: Imports MyCodeLibrary.MyTypes.MyEnums Public Class Public Sub Dim e As Dim s As End Sub End Class Class2 MySub() TestEnum New MyCodeLibrary.MyTypes.SomeClass

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