#include <db_cxx.h> int DbEnv::rep_start(Dbt *cdata, u_int32_t flags);
The DbEnv::rep_start() method configures the database environment as
a client or master in a group of replicated database environments.
The DbEnv::rep_start() method is not called by most replication
applications. It should only be called by Base API applications implementing
their own network transport layer, explicitly holding replication
group elections and handling replication messages outside of the
Replication Manager framework.
Replication master environments are the only database environments where replicated databases may be modified. Replication client environments are read-only as long as they are clients. Replication client environments may be upgraded to be replication master environments in the case that the current master fails or there is no master present. Replication view environments are always read-only and can never become master environments. If master leases are in use, this method cannot be used to appoint a master, and should only be used to configure a database environment as a master as the result of an election.
The enclosing database environment must already have been opened by calling the DbEnv::open() method and must already have been configured to send replication messages by calling the DbEnv::rep_set_transport() method. If you are starting a view, you must have called the DbEnv::rep_set_view() method before opening the enclosing database environment.
The DbEnv::rep_start()
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
The cdata parameter is an opaque data item that is sent over the communication infrastructure when the client comes online (see Connecting to a new site for more information). If no such information is useful, cdata should be NULL.
The DbEnv::rep_start()
method may fail and throw a DbException
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
If the flags parameter was passed as DB_REP_MASTER but the database environment cannot currently become the replication master because it is temporarily initializing and is incomplete.
If the database environment was not already configured to communicate with a replication group by a call to DbEnv::rep_set_transport() ; the database environment was not already opened; this method is called from a Replication Manager application; outstanding master leases are granted; this method is used to appoint a new master when master leases are in use; a view is being started without having called the DbEnv::rep_set_view() method before opening the database environment; or if an invalid flag value or parameter was specified.