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This illustration shows a Streams replication environment that involves the following databases:

The following sections describe the configuration at each database.

The dbs1.net Oracle database has the following configuration:

One Streams queue named streams_queue and owned by the user strmadmin.
A capture process named capture that captures DML and DDL changes to the tables in the hr schema: countries, departments, employees, job_history, jobs, locations, and regions.
A propagation job named dbs1_to_dbs2 that propagates change from the local queue to the strmadmin.streams_queue queue at dbs2.net.

The dbs2.net Oracle database has the following configuration:

One Streams queue named streams_queue and owned by the user strmadmin.
An apply process named apply_db2 that applies changes to the hr.assignments table.
An apply process named apply_db4 that applies changes to the hr.jobs table at dbs4.net, which is a Sybase database. The apply process uses a gateway to apply changes to dbs4.net.
An rule-based transformation specified for apply_db2 that modifies LCRs that include DML changes to the hr.jobs table to LCRs that include DML changes to the hr.assignments table. The transformation function is named to_assignments.
A propagation job named dbs2_to_dbs3 that propagates change from the local queue to the strmadmin.streams_queue queue at dbs3.net. These changes originated at dbs1.net.

The dbs3.net Oracle database has the following configuration:

One Streams queue named streams_queue and owned by the user strmadmin.
An apply process named apply that applies changes to the hr.countries, hr.regions, and hr.locations tables.

The dbs4.net Sybase database contains an hr.jobs table.