DBMS_SCHEDULER.CREATE_JOB

我不明白这个创建job中所用的event_condition
PROCEDURE create_job(
  job_name                IN VARCHAR2,
  job_type                 IN VARCHAR2,
  job_action              IN VARCHAR2,
  number_of_arguments     IN PLS_INTEGER              DEFAULT 0,
  start_date              IN TIMESTAMP WITH TIME ZONE DEFAULT NULL,
  event_condition         IN VARCHAR2,
  queue_spec              IN VARCHAR2,
  end_date                IN TIMESTAMP WITH TIME ZONE DEFAULT NULL,
  job_class               IN VARCHAR2              DEFAULT 'DEFAULT_JOB_CLASS',
  enabled                 IN BOOLEAN                  DEFAULT FALSE,
  auto_drop               IN BOOLEAN                  DEFAULT TRUE,
  comments                IN VARCHAR2                 DEFAULT NULL);

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