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Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
Enterprise Replication
The HCL® Informix® Enterprise Replication Guide describes the concepts of data replication using Informix Enterprise Replication, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.
About Enterprise Replication
Informix® Enterprise Replication generates and manages multiple copies of data at one or more sites, which allows an enterprise to share corporate data throughout its organization.
HCL Informix® Enterprise Replication technical overview
Informix® Enterprise Replication is an asynchronous, log-based tool for replicating data between HCL Informix database servers. Enterprise Replication on the source server captures transactions to be replicated by reading the logical log, storing the transactions, and reliably transmitting each transaction as replication data to the target servers.
High Availability

Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
- System administration
  These topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL Informix® database servers.
- Backup and Restore Guide
  The Informix® Backup and Restore Guide describes how to use the Informix ON-Bar and ontape utilities to back up and restore database server data. These utilities enable you to recover your databases after data is lost or becomes corrupted due to hardware or software failure or accident.
- Enterprise Replication
  The HCL® Informix® Enterprise Replication Guide describes the concepts of data replication using Informix Enterprise Replication, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.
  - About Enterprise Replication
    Informix® Enterprise Replication generates and manages multiple copies of data at one or more sites, which allows an enterprise to share corporate data throughout its organization.
    - HCL Informix® Enterprise Replication technical overview
      Informix® Enterprise Replication is an asynchronous, log-based tool for replicating data between HCL Informix database servers. Enterprise Replication on the source server captures transactions to be replicated by reading the logical log, storing the transactions, and reliably transmitting each transaction as replication data to the target servers.
      - Enterprise Replication Terminology
        You must understand Enterprise Replication terminology.
      - Asynchronous Data Replication
      - Log-Based Data Capture
      - High Performance
      - High Availability
      - Consistent Information Delivery
      - Repair and Initial Data Synchronization
        Enterprise Replication provides initial data synchronization and multiple methods to repair replicated data.
      - Flexible Architecture
        Enterprise Replication allows replications based on specific business and application requirements and does not impose model or methodology restrictions on the enterprise.
      - Centralized Administration
      - Ease of Implementation
      - Network Encryption
        Enterprise Replication supports the same network encryption options that you can use with communications between server and clients to provide complete data encryption.
    - How Enterprise Replication Replicates Data
  - Planning and designing for Enterprise Replication
    Before you set up your replication system, plan how to include Enterprise Replication into your database server environment, design your database schema by following Enterprise Replication requirements, and then design your replication system between database servers.
  - Setting up and managing Enterprise Replication
    After you design your replication system, you define it and start replication.
  - Push data feature
  - Loopback replication
  - Appendixes

High Availability

Because Enterprise Replication implements asynchronous data replication, network and target database server outages are tolerated. In the event of a database server or network failure, the local database server continues to service local users. The local database server stores replicated transactions in persistent storage until the remote server becomes available.

If high availability is critical, you can use high-availability clusters in conjunction with Enterprise Replication. High-availability clusters support synchronous data replication between database servers: a primary server, which can participate in Enterprise Replication, and one or more secondary servers, which do not participate in Enterprise Replication. If a primary server in a high-availability cluster fails, a secondary server can take over the role of the primary server, allowing it to participate in Enterprise Replication. Client connections to the original primary server can be automatically switched to the new standard server.

For more information on using high-availability clusters with Enterprise Replication, see Using High-Availability Clusters with Enterprise Replication.