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The following table shows the server processes that are initially set up when iProcess Engine is installed. The details of each process are stored in the process_config table. Note that:
• Process Sentinels are responsible for controlling all the TIBCO iProcess Engine processes. If a node cluster architecture is used, then Process Sentinels will exist on each server to manage the processes running on that server.
• Foreground processes are responsible for communicating with TIBCO iProcess Workspaces and for passing any TIBCO iProcess Workspace requests such as released work items to the background area for processing.
• Background processes are responsible for processing message instructions received from the clients such as releasing a step or forwarding a step. They also monitor and process any deadlines that have been set up in the procedure and manage case prediction.
Table 7 Server Processes Name Shown in Task Manager1 RPC_POOL2 1-n DBQD3 IAPJMS4
Sequence numbers are generated on an “as required” basis by calling a stored database procedure that accesses the sequence table. (This table contains an identity column. The procedure inserts a row into the table, returns the value of the identity column, then deletes the row.)
• The different sequence numbers that can be cached, and the process attributes that you need to set to cache them. (See Administering Process Attributes for more information about process attributes and how to set them.)
• Gaps may appear in the value of the sequence numbers. For example, if the BG process caches 50 REQ IDs when it starts up, processes one NEWCASE instruction and then shuts down, the unused REQ IDs (2 to 50) will be lost.
• It is possible for a lower case number to be started after a higher case number. For example, suppose that a WIS has 50 case numbers (1 to 50) cached, and a user uses SWUTIL CSTART, which are located in the SWDIR\bin directory to start a case. The case will have case number 51 - the next available number in the sequence. However, if a user then starts a case through the WIS, that case will have case number 1 - the next available number in the cached sequence. Thus, the start date/time for case number 1 will be later than the start date/time for case number 51.
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