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If you examine the property page of Periodic Alert, you see that it has a persistence type of Temporary and persistence number of days of 0. This means that the run time data associated with any item instances for this item type are eligible for purging as soon as they complete. A Selector function is not specified because the process to start is specified when you initiate a Periodic Alert process from the web-based interface.

The Periodic Alert item type also has several associated attributes. These attributes record information provided when you initiate a Periodic Alert process. The attributes are used and maintained by function activities as well as notification activities throughout each process. The following table lists the Periodic Alert item type attributes.

Display Name	Description	Type	Length/Format/Lookup Type
Alert Recipient	Role to notify when alert exception is detected	Role
Start date	Date to start alert check (default is today)	Date	DD-MON-YYYY HH24:MI:SS
End date	Date to end alert check (default is 12/31/2010 12:12:12 PM)	Date	DD-MON-YYYY HH24:MI:SS
Frequency	Frequency to check the alert	Lookup	Wait Mode
Frequency - day of month	Day of month required when Frequency is Day of Month	Lookup	Day of Month
Frequency - day of week	Day of week required when Frequency is Day of Week	Lookup	Day of Week
Frequency - time of day	Time optional, but used by Wait activity for any Frequency value	Date	HH24:MI
Frequency - days	Number of days required when Frequency is Relative Time	Number
Once Only	Perform Alert Once Only	Lookup	Yes/No