复制信息参考

All Nodes¶

The following fields are present in the output of db.getReplicationInfo() for both primary and secondary nodes.

db.getReplicationInfo.logSizeMB¶

Returns the total size of the oplog in megabytes. This refers to the total amount of space allocated to the oplog rather than the current size of operations stored in the oplog.

db.getReplicationInfo.usedMB¶

Returns the total amount of space used by the oplog in megabytes. This refers to the total amount of space currently used by operations stored in the oplog rather than the total amount of space allocated.

Primary Nodes¶

The following fields appear in the output of db.getReplicationInfo() for primary nodes.

db.getReplicationInfo.errmsg¶

Returns the last error status.

db.getReplicationInfo.oplogMainRowCount¶

Returns a counter of the number of items or rows (i.e. documents) in the oplog.

Secondary Nodes¶

The following fields appear in the output of db.getReplicationInfo() for secondary nodes.

db.getReplicationInfo.timeDiff¶

Returns the difference between the first and last operation in the oplog, represented in seconds.

db.getReplicationInfo.timeDiffHours¶

Returns the difference between the first and last operation in the oplog, rounded and represented in hours.

db.getReplicationInfo.tFirst¶

Returns a time stamp for the first (i.e. earliest) operation in the oplog. Compare this value to the last write operation issued against the server.

db.getReplicationInfo.tLast¶

Returns a time stamp for the last (i.e. latest) operation in the oplog. Compare this value to the last write operation issued against the server.

db.getReplicationInfo.now¶

Returns a time stamp reflecting the current time. The shell process generates this value, and the datum may differ slightly from the server time if you’re connecting from a remote host as a result. Equivalent to Date().