Progress Fathom Replication
User’s Guide


Target database access

The type of access allowed on the target database depends on which Fathom Replication product you have installed and the activity being performed by the Replication agent.

If the Fathom Replication Plus product is installed, the target database can be accessed for read-only use by any process. If updates are attempted, an error will occur.

If the Fathom Replication Plus product is not installed, access to the target database is limited to the following system-level tools shown in Table 2–2.

Limited logins are allowed immediately after the agent completes its startup. Normal logins that allow the access listed in Table 2–2 are allowed after synchronization completes.

Table 2–2: Standard system-level access to target database
Tool
Description
Shut down
PROSHUT command to shut down the database.
Monitor
PROMON utility that displays database information.
AIW
A background process that writes AI buffers to disk soon after they are filled.
BIW
A background process that continually writes filled BI buffers to disk.
WDOG
The watchdog cleans up after improperly terminated processes.
Replication agent
Receives information from the Replication server and updates the target database.
Replication Utility DSRUTIL
Allows you to perform specific Replication agent and target database commands.
Fathom database agent
Provides information to Fathom Management about the status of the database.

If the Fathom Replication agent is transitioning the target database to a normal Progress database, critical system-level commands are allowed to access the database, as shown in Table 2–3.

Table 2–3: System-level access to target database during transition 
System-level activity
Description
Shut down
PROSHUT command to shut down the database.
Monitor
PROMON that displays database information.
WDOG
The watchdog cleans up after improperly terminated processes.

When transition is complete and the target database becomes a normal Progress database, all traditional database activity is allowed.

Connecting a client to a target database in read-only mode (-RO) is never allowed. If the target database transitions to a normal Progress database, read-only mode is allowed.


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