Progress Fathom Replication
User’s Guide

> ## Limitations and restrictions

> Before you begin implementing Fathom Replication, you should be aware of the following:

> - In general, a database enabled for Fathom Replication cannot be modified in structure or data when Fathom Replication is not running.

> When Fathom Replication is running, there are specific activities allowed on the source and target databases. If an attempt is made to perform unauthorized activity, an error message is logged and the activity is disallowed.

> For specific details on activities that are allowed and disallowed, see Table 3–14.

> - Fathom Replication does not support two phase commit enabled databases.

> - Fathom Replication requires at least one 4GL broker in order to function. This 4GL broker must be started before any SQL broker. Specifically, the 4GL broker must be the first broker started. When SQL brokers are started, you must not specify the -`DBService` startup argument.

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