The ReplicationConfig type exposes the following members.
Constructors
Name | Description | |
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ReplicationConfig |
Instantiate a new ReplicationConfig object with default
configuration values.
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Methods
Name | Description | |
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Clockskew |
Set the clock skew ratio among replication group members based on
the fastest and slowest measurements among the group for use with
master leases.
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Equals | (Inherited from Object.) | |
GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) | |
GetType | Gets the type of the current instance. (Inherited from Object.) | |
RetransmissionRequest |
Set a threshold for the minimum and maximum time that a client waits
before requesting retransmission of a missing message.
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ToString | Returns a string that represents the current object. (Inherited from Object.) | |
TransmitLimit |
Set a byte-count limit on the amount of data that will be
transmitted from a site in response to a single message processed by
RepProcessMessage(DatabaseEntry, DatabaseEntry, Int32). The limit is
not a hard limit, and the record that exceeds the limit is the last
record to be sent.
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Fields
Name | Description | |
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AutoInit |
If true, the replication master will automatically re-initialize
outdated clients (defaults to true).
| |
BulkTransfer |
If true, the replication master will send groups of records to the
clients in a single network transfer
| |
DelayClientSync |
If true, the client will delay synchronizing to a newly declared
master (defaults to false). Clients configured in this way will
remain unsynchronized until the application calls
RepSync()()().
| |
Elections |
If true, Replication Manager automatically runs elections to
choose a new master when the old master appears to
have become disconnected (defaults to true).
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InMemory |
If true, replication only stores the internal information in-memory
and cannot keep persistent state across a site crash or reboot. By
default, it is false and replication creates files in the
environment home directory to preserve the internal information.
This configuration flag can only be set before the
DatabaseEnvironment is opened.
| |
NoBlocking |
If true, Berkeley DB method calls that would normally block while
clients are in recovery will return errors immediately (defaults to
false).
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RepMgrAckPolicy |
Specify how master and client sites will handle acknowledgment of
replication messages which are necessary for "permanent" records.
The current implementation requires all sites in a replication group
configure the same acknowledgement policy.
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RepmgrSitesConfig |
A list of site configurations.
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Strict2Site |
If true, the Replication Manager will observe the strict "majority"
rule in managing elections, even in a group with only 2 sites. This
means the client in a 2-site group will be unable to take over as
master if the original master fails or becomes disconnected. (See
the Elections section in the Berkeley DB Reference Guide for more
information.) Both sites in the replication group should have the
same value for this parameter.
| |
Transport |
The delegate used to transmit data using the replication
application's communication infrastructure.
| |
UseMasterLeases |
If true, master leases will be used for this site (defaults to
false).
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Properties
Name | Description | |
---|---|---|
AckTimeout |
The amount of time the replication manager's transport function
waits to collect enough acknowledgments from replication group
clients, before giving up and returning a failure indication. The
default wait time is 1 second.
| |
CheckpointDelay |
The amount of time a master site will delay between completing a
checkpoint and writing a checkpoint record into the log.
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ClockskewFast |
The value, relative to ClockskewSlow, of the fastest
clock in the group of sites.
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ClockskewSlow |
The value of the slowest clock in the group of sites.
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ConnectionRetry |
The amount of time the replication manager will wait before trying
to re-establish a connection to another site after a communication
failure. The default wait time is 30 seconds.
| |
ElectionRetry |
Configure the amount of time the replication manager will wait
before retrying a failed election. The default wait time is 10
seconds.
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ElectionTimeout |
The timeout period for an election. The default timeout is 2
seconds.
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FullElectionTimeout |
An optional configuration timeout period to wait for full election
participation the first time the replication group finds a master.
By default this option is turned off and normal election timeouts
are used. (See the Elections section in the Berkeley DB Reference
Guide for more information.)
| |
HeartbeatMonitor |
The amount of time the replication manager, running at a client
site, waits for some message activity on the connection from the
master (heartbeats or other messages) before concluding that the
connection has been lost. When 0 (the default), no monitoring is
performed.
| |
HeartbeatSend |
The frequency at which the replication manager, running at a master
site, broadcasts a heartbeat message in an otherwise idle system.
When 0 (the default), no heartbeat messages will be sent.
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LeaseTimeout |
The amount of time a client grants its master lease to a master.
When using master leases all sites in a replication group must use
the same lease timeout value. There is no default value. If leases
are desired, this method must be called prior to calling
RepStartClient()()() or
RepStartMaster()()().
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NSites |
The total number of sites in the replication group.
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Priority |
The database environment's priority in replication group elections.
A special value of 0 indicates that this environment cannot be a
replication group master. If not configured, then a default value
of 100 is used.
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RetransmissionRequestMax |
The maximum number of microseconds a client waits before requesting
retransmission.
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RetransmissionRequestMin |
The minimum number of microseconds a client waits before requesting
retransmission.
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TransmitLimitBytes |
The bytes component of the byte-count limit on the amount of data
that will be transmitted from a site in response to a single
message processed by
RepProcessMessage(DatabaseEntry, DatabaseEntry, Int32).
| |
TransmitLimitGBytes |
The gigabytes component of the byte-count limit on the amount of
data that will be transmitted from a site in response to a single
message processed by
RepProcessMessage(DatabaseEntry, DatabaseEntry, Int32).
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