User Guide

After-image extent sizing based on hourly data

After the total after-image data written for four, separate one-hour periods is determined, the sizing calculations described in the following table are performed.

Description | Measurement/estimate |

Average after-image data generated in one typical work hour | 72.5MB, which is the average of the following: 70MB in hour 1 67MB in hour 2 79MB in hour 3 74MB in hour 4 |

OpenEdge Replication after-image overhead | 50%, or 1.5 multiplier |

Number of processing hours during a typical workday | 16 hours per day |

Number of processing hours during the typical workweek | 80 (16 hours per day x 5 days) |

Estimate of after-image data generated in one day | 1160MB, or 1.13GB (72.5MB x 16 hours per day) |

Estimate of after-image data generated in one workweek | 5800MB, or 5.66GB (1160MB x 5 days) |

Estimate of after-image data generated in one hour with OpenEdge Replication overhead | 109MB (72.5MB x 1.5) |

Estimate of after-image data generated in one day with OpenEdge Replication overhead | 1740MB (1160MB x 1.5) |

Estimate of after-image data generated in one workweek with OpenEdge Replication overhead | 8700MB (1740MB x 5 days) |

Single fixed after-image extent size | 450MB (109MB x 4 hours) |

Total number of after-image extents necessary to handle one week of processing | 19 extents (8700MB / 450MB) |

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Progress® OpenEdge® Release 11.7