DB_ENV->rep_start(DB_ENV *env, DBT *cdata, u_int32_t flags);
The DB_ENV->rep_start method configures the database environment as a client
or master in a group of replicated database environments. 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.
The enclosing database environment must already have been opened by
calling the DB_ENV->open method and must already have been configured
to send replication messages by calling the DB_ENV->set_rep_transport method.
The cdata parameter is an opaque data item that is sent over
the communication infrastructure when the client or master comes online
(see Connecting to a new site for
more information). If no such information is useful, cdata
should be NULL.
The flags value must be set to one of the following values:
- Configure the environment as a replication client.
- Configure the environment as a log files-only client.
- Configure the environment as a replication master.
The DB_ENV->rep_start method returns a non-zero error value on failure and 0 on success.
The DB_ENV->rep_start method may fail and return a non-zero error for the following conditions:
- An invalid flag value or parameter was specified.
The environment was not already configured to communicate with a
replication group by a call to DB_ENV->set_rep_transport.
The environment was not already opened.
The DB_ENV->rep_start method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the DB_ENV->rep_start method may fail and
in which case all subsequent Berkeley DB calls will fail in the same way.
Replication and Related Methods
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