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English
  • Data Replication 9.8.0
  • All Products

Table of Contents

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  1. Preface
  2. Data Replication Overview
  3. Understanding Data Replication
  4. Sources - Preparation and Replication Considerations
  5. Targets - Preparation and Replication Considerations
  6. Starting the Server Manager
  7. Getting Started with the Data Replication Console
  8. Defining and Managing Server Manager Main Servers and Subservers
  9. Creating and Managing User Accounts
  10. Creating and Managing Connections
  11. Creating Replication Configurations
  12. Materializing Targets with InitialSync
  13. Scheduling and Running Replication Tasks
  14. Implementing Advanced Replication Topologies
  15. Monitoring Data Replication
  16. Managing Replication Configurations
  17. Handling Replication Environment Changes and Failures
  18. Troubleshooting
  19. Data Replication Files and Subdirectories
  20. Data Replication Runtime Parameters
  21. Command Line Parameters for Data Replication Components
  22. Updating Configurations in the Replication Configuration CLI
  23. DDL Statements for Manually Creating Recovery Tables
  24. Sample Scripts for Enabling or Disabling SQL Server Change Data Capture
  25. Glossary

User Guide

User Guide

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Configuring Continuous Replication

Configuring Continuous Replication

With the Server Manager, you can perform continuous data replication. Continuous replication delivers source table changes to the target with very low latency.
Before you configure continuous replication, verify that Data Replication supports change data capture from online logs for the source database. Also, from the Data Replication Console, define the tasks that you want to execute continuously.
  1. Load or create a configuration.
  2. Switch to Edit mode.
  3. On the
    Extract Range
     tab, select one of the following options if you want the Extractor to capture data from online logs:
    • For Microsoft SQL Server sources, select
      Read from online transaction logs
      .
    • For Oracle sources, select
      Read from online redo logs
      .
  4. Click the
    Runtime Settings
     tab >
    General
     view.
  5. In the
    Continuous replication latency
     field, enter the latency, in seconds, of change capture processing during continuous data replication.
    This value determines the duration of an Extractor microcycle. During a microcycle, the Extractor captures changes from database logs, creates an intermediate file, writes changes to the intermediate file, and then sleeps. When the latency period ends, the Extractor begins another microcycle.
    When setting the latency period, consider how it affects replication performance:
    • If the latency period is greater than the time it takes the Extractor to read changes from the database logs and write them to an intermediate file, the Extractor sleeps until the end of the latency period. To minimize inactive Extractor sleep periods, set the latency to a low value.
    • If the latency period is equal to or less than the time it takes the Extractor to read changes from the database logs and write them to an intermediate file, the Extractor continues processing and does not sleep. The Extractor begins a new microcycle as soon as it closes the intermediate file. However, if the latency is too low, performance of a long-running Extractor task might be degraded because of high disk memory or core loads. In this case, try increasing the latency value in sub-second increments such as 0.1 seconds.
    Default is 0.333 seconds, which is usually acceptable to process all changes in a microcycle.
    After the Extractor creates the intermediate file, the Applier can start reading changes and applying them to the target. Therefore, the Applier might also run during a microcycle. For large transactions with many changes, the Applier waits until the Extractor writes all of the changes to the intermediate file, which might take several microcycles, and then begins apply processing.
  6. Save the configuration.
  7. On the
    Server Manager
     tab >
    Schedules
     view, create a schedule with the tasks you defined for continuous replication.
    Do not add subtasks that have dependencies on other tasks.
    To create a schedule, use one of the following methods:
    • Click
      New
       to define a schedule in the
      New
       dialog box. In the
      Run
       field, you must select
      Continuous
      . Also define a run period under
      Schedule Options
      . In the
      End date
       field, you can specify a date with a year up to 2037.
    • Click
      Wizard
       to start the
      Schedule wizard
      . In Step 1, you must select
      Continuous
       as the execution scheme. In Step 2, define a run period under
      Schedule Options
      .
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