What (like ORA- or OGG-) appear right before this message in your ggserr.log or database alert log?
Log output:
In environments with low transactional volume, an Integrated Extract might hit an idle timeout threshold. If no new redo data is generated for an extended period, or if network instability disrupts the IPC (Inter-Process Communication) between GoldenGate and the database instance, the client may detach to prevent resource locking. 4. Critical Database Errors (ORA- Errors) What (like ORA- or OGG-) appear right before
During the shutdown sequence, the Extract client flushes its buffers, checkpoints its current position, and tells the database engine it is disconnecting. This logs the successful detachment message. B. Extract Process Restart or Abort Recovery
If this message appears unexpectedly and causes data replication to halt, follow these troubleshooting steps to identify the root cause: Step 1: Check the GoldenGate Error Log undergoes a rolling upgrade
This message is an informational update indicating that the communication link between the OGG Extract process and the database-level mining server has been severed.
While usually benign, if you see this message appearing suspiciously often (e.g., hundreds of times an hour), consider the following checks: or executes a failover
GoldenGate ensures all data currently in the memory queues are written to the trail files. Detachment Message:
To understand the beauty of the detachment, one must first understand the intensity of the attachment. In an Oracle GoldenGate environment, the Capture Client is a relentless observer. It lives for the Redo Log , the forensic history of every INSERT , UPDATE , and DELETE performed on a source database. Imagine a librarian who not only memorizes every book checked out but also every page turned, every marginal note scribbled, and every coffee stain acquired. The Capture Client is that obsessive. It reads the transaction logs in real-time, serializing chaos into neat, logical change records (trails) to be shipped to a target system.
In Oracle Real Application Clusters (RAC) or Data Guard environments, if the specific database instance hosting the logmining server crashes, undergoes a rolling upgrade, or executes a failover, the Extract will be forcefully detached. 4. Network Timeouts and Heartbeat Failures
While a "successful detach" is usually positive, the following conditions require attention:
