This method starts import processing when the target Datareplicator starts. It enables you to import update information in the order it is received.

• Purpose
  This method is appropriate for importing update information in the order it is received.
  
• Specification in the import environment definition
  Specify the trn (transaction-based import method) or tbl (table-based import method) in the startmode operand.
  
• Command execution
  Execute the hdsstart command.
  

This method starts only reception processing when the target Datareplicator starts and starts import processing at a specified time (delayed start). Use this method to perform some tasks before starting the import processing, such as changing definitions or maintaining the import database.

When the delayed start method is used, the update information sent from the source system is stored in the import information queue file because reception processing has already begun. There are three types of delayed start:

(a) Time-specified start method

This method starts import processing when a user-specified interval elapses. The specified value is an amount of time since the target Datareplicator starts.

• Purpose
  This method is appropriate when you must conduct periodic database maintenance after starting the target Datareplicator.
  
• Specification in the import environment definition
  
  • Specify spd in the startmode operand.
  • Use the breaktime operand to specify the amount of time after which import processing is to be started.
• Command execution
  Execute the hdsstart command.
  

(b) Command start method

This method starts import processing when a command executes. You can use this method to control import operations from the target system.

• Purpose
  This method is appropriate when the import start time varies from day to day.
  
• Specification in the import environment definition
  Specify spd in the startmode operand.
  
• Command execution
  Execute the hdsrfctl command.
  

(c) Event start method

This method starts import processing when an event sent from the source system is detected. You can use this method to control import operations from the source system.

• Purpose
  This method is appropriate when you want to use source system operations to control import operations.
  
• Specification at the source system
  Immediately before the start of import processing, specify as an event the UAP that is subject to extraction.
  
• Specification in the import environment definition
  Specify spd in the startmode operand. Use the eventretrn or eventretbl operand to establish correspondence between an event code defined at the source system and the import start method to be used after the event is received.