Capture

Use this page to monitor data capture activity at the selected Enterprise Replication (ER) node.

You can view the following information:

Capture State

The state of data capture at the current node.

Table 1. Capture state
State	Description
Running	Log capture is running normally
Down	Log capture is not running
Uninitialized	The node is not a source server for replication

Capture Log Position: The position in the logical log that was last read and where data was last captured for replication. Compare this value to the current log position value to determine if data capture is keeping up with transactions.

Replay Log Position: The position where ER starts rereading the log information in to the log update buffers after a failure. All the transactions generated before this position at all the target servers have been applied by ER or safely stored in the queue.
Important: Ensure that this position is never overwritten to prevent loss of data. If you notice that the replay position is not advancing, check if the queue is full or a if remote server is down.

Proximity to DDRBLOCK: The number of pages left in the logical log space before user transactions are blocked to prevent log wraps. To prevent DDRBLOCK, you can dynamically add logical log space by using the CDR_MAX_DYNAMIC_LOGS parameter from the Server Administration > Configuration page.

Proximity to Log Wrap: The number of pages until the logical log wraps and overwrites transactions not captured for replication.

Log Records Captured from Cache: The number of log records that capture has read from the cache

Log Records Captured from Disk: The number of log records that data capture has read from the disk.

Log Cache Overflows: The number of log records discarded because the cache was full.

Log Records not supported by ER: The number of log records that were ignored because they are not recognized by ER.

System Dynamic Logs: The maximum number of dynamic logs that can be requested. Specified by the DYNAMIC_LOGS parameter.

Maximum Dynamic Logs: The maximum number of dynamic logs that ER can request. Specified by the CDR_MAX_DYNMAIC_LOGS and the DYNAMIC_LOGS configuration parameters.

Dynamic Log Requests: The number of times ER has requested additional logs to be created to avoid DDRBLOCK. If this number is approaching the maximum number of logs then the parameter value might have to be changed.