Page Comparison

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1. Scheduled-style mechanism

   This group of approaches is based on periodic scanning of all saved pieces and determining the status of poline on this basis. A typical algorithm for such mechanism might look as shown on Figure 1.

2. Image Added

   Checking and updating the PO line status upon retrieving

   PostgreSQL Trigger Functions

   Vert.X Periodic Timer

   #_executing_periodic_and_delayed_actions

3. Interceptor-style mechanisms

   Separate Scheduler Application

   PostgreSQL cron-job

   pg_cron

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