Accessing a target database

The type of access allowed on the target database depends on which OpenEdge Replication product you have installed and the activity being performed by the OpenEdge Replication agent, as follows:

If OpenEdge Replication Plus is installed, any process can access the target database for read-only use. If updates are attempted, an error occurs.

If OpenEdge Replication is installed, access to the target database is limited to the system-level tools shown in the table that follows.

Limited logins are allowed immediately after the agent completes its startup. Normal logins that allow the access listed in the table that follows are allowed after synchronization completes.

Table 9. Standard system-level access permitted 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 that cleans up after improperly terminated processes
OpenEdge Replication agent	Receives information from the OpenEdge Replication server and updates the target database
OpenEdge Replication Utility DSRUTIL	Allows you to perform specific OpenEdge Replication agent and target database commands
Database agent	Provides information to OpenEdge Management or OpenEdge Explorer about the status of the database

If the OpenEdge Replication agent is transitioning the target database to a normal OpenEdge database (one not enabled for replication), critical system-level commands are allowed to access the database, as shown in the table that follows. Transition refers to the changing of the database role after a database failure and is described in detail in the sections:

Transition

Overview of database failure recovery

Table 10. System-level access to target database permitted during transition
System-level activity	Description
Shut down	The PROSHUT command shuts down the database.
Monitor	The PROMON utility displays database information.
WDOG	The watchdog cleans up after improperly terminated processes.

When transition is complete and the target database becomes a normal OpenEdge 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 OpenEdge database, read-only mode is allowed.