Replication Environment Considerations

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Replication Environment Considerations

Each replication system that you create affects your environment. Consider the following when setting up your replication environment:

Time Synchronization

Whenever you use replication that requires time stamp conflict resolution (see Conflict Resolution), the operating system times of the database servers that participate in the replicate must be synchronized. All time stamps and internal computations are performed in Greenwich Mean Time (GMT) and have an accuracy of plus or minus one second.

Important:

Enterprise Replication does not manage clock synchronization between database servers that participate in a replicate.

To synchronize the time on one database server with the time on another database server, use one of the following commands.

Operating System	Command
UNIX	rdate hostname
Windows	`net time \\`servername `/set`
Windows	`net time /domain:`servername `/set`

Important:

These commands do not guarantee the times will remain synchronized. You should use a product that supplies a network time protocol to ensure that times remain synchronized. For information on tools for synchronizing the times, refer to your operating system documentation.

Using GLS with Enterprise Replication

An Enterprise Replication system can include databases in different locales, with the following restrictions:

When you define a database server for Enterprise Replication, that server must be running in the U. S. English locale.
In other words, the syscdr database on every Enterprise Replication server must be in the English locale.
You can replicate only between databases that are in the same locale.
Replicate names can be in the locale of the database.

Code-set conversion with the GLS library requires only those code-set conversion files found in the $INFORMIXDIR/gls/cv9 directory.

For U.S. English, locales are handled automatically by the Client SDK/Informix Connect installation and setup.
For non-U.S. English locales, you might need to explicitly provide the locale and conversion files.

For information about how to specify a nondefault locale and other considerations related to GLS locales, see the IBM Informix GLS User's Guide.