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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.
Setting up and managing Enterprise Replication
After you design your replication system, you define it and start replication.
Managing Replication Servers and Replicates
Managing Replicates
Modify replicates
You can modify replicates while replication is active to add or remove participants, or to change some replicate attributes.
Changing the replication key of a replicate
You can change the replication key of a replicate from the primary key, a unique index or constraint, or the ERKEY shadow columns to another unique index or constraint on your table.

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.
  - 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.
    - Preparing the Replication Environment
      The following topics explain the steps that are required for setting up Enterprise Replication.
    - Using High-Availability Clusters with Enterprise Replication
    - Defining Replication Servers, Replicates, Participants, and Replicate Sets
      These topics describe the steps defining and starting Enterprise Replication.
    - Grid setup and management
      A grid is a set of replication servers that are configured to simplify administration. When you run SQL data definition statements from within a grid context on a grid server, the statements propagate to all servers in the grid. You can run SQL data manipulation statements and routines through grid routines. You can choose to set up replication automatically when you create a table through a grid. You can propagate external files to other servers in the grid.
    - Shard cluster setup
      Sharding is a way to horizontally partition a single table across multiple database servers in a shard cluster. Enterprise Replication moves the data from the source server to the appropriate target server as specified by the sharding method. You query a sharded table as if the entire table is on the local server. You do not need to know where the data is. Queries that are performed on one shard server retrieve the relevant data from other servers in a shard cluster. Sharding reduces the index size on each shard server and distributes performance across hardware. You can add shard servers to the shard cluster as your data grows.
    - Managing Replication Servers and Replicates
      - Managing Replication Servers
      - Managing Replicates
        Modify replicates
        You can modify replicates while replication is active to add or remove participants, or to change some replicate attributes.
        Adding or Deleting Participants
        Change replicate attributes
        You can change many replicate attributes by running the cdr modify replicate command.
        Changing the replication key of a replicate
        You can change the replication key of a replicate from the primary key, a unique index or constraint, or the ERKEY shadow columns to another unique index or constraint on your table.
        Viewing Replicate Properties
        Starting a Replicate
        Stopping a Replicate
        You can temporarily stop replication for administrative purposes.
        Suspending a Replicate
        Resuming a Suspended Replicate
        Deleting a Replicate
        To delete a replicate from the global catalog, use the cdr delete replicate command.
      - Managing Replicate Sets
      - Managing Templates
      - Managing Replication Server Network Connections
      - Resynchronizing Data among Replication Servers
        If replication has failed for some reason and data is not synchronized, there are different ways to correct data mismatches between replicated tables.
      - Alter, rename, or truncate operations during replication
        When Enterprise Replication is active and data replication is in progress, you can perform many types of alter, rename, or truncate operations on replicated tables and databases.
      - Recapture replicated transactions
        If you want a transaction to continue to be replicated after it reaches the target replication servers, you can use the ifx_set_erstate() procedure.
    - Monitor and troubleshooting Enterprise Replication
      You can monitor and diagnose problems with the Enterprise Replication system by using several different methods, depending on your needs.
  - Push data feature
  - Loopback replication
  - Appendixes

Changing the replication key of a replicate

You can change the replication key of a replicate from the primary key, a unique index or constraint, or the ERKEY shadow columns to another unique index or constraint on your table.

Procedure

To change the replication key of a replicate:

Define a new replicate by running the cdr define replicate command. Include the --key option to specify the new replication key. Do not include the --erkey option.
Start the new replicate by running the cdr start replicate command.
Stop the original replicate by running the cdr stop replicate command.
Delete the original replicate by running the cdr delete replicate command.