Ogg-01184 Expected 4 Bytes But Got 0 Bytes In Trail Today
The Ghost in the Machine: Investigating OGG-01184 The error OGG-01184: Expected 4 bytes, but got 0 bytes, in trail is a classic Oracle GoldenGate "abend" (abnormal end) that usually signals trail file corruption. It occurs when a reader process (like a Pump or Replicat) reaches a point where it expects a specific 4-byte token—typically a record trailer—but finds nothing but an empty void (0 bytes). Common Root Causes
If next returns an error or shows a partial record at the end of the file, the trail is indeed truncated. 3. Resolve the Issue Depending on the process type, use one of the following: ogg-01184 expected 4 bytes but got 0 bytes in trail
Restart the Pump; it will automatically rebuild and re-send the missing trail files from the source. The Ghost in the Machine: Investigating OGG-01184 The
- Stop the Replicat process:
GGSCI> STOP REPLICAT <replicat_name>
- Navigate to the trail directory and delete or move the empty file(s).
rm /u01/gg/dirdat/rt000123
# OR move it to a backup location
mv /u01/gg/dirdat/rt000123 /u01/gg/backup/
- If the next valid file exists (e.g.,
rt000124), you may need to alter the Replicat to point to that file. However, usually, simply deleting the empty file allows the Replicat to wait for the Extract to send valid data or move to the next sequence automatically if data exists.
- Start the Replicat:
GGSCI> START REPLICAT <replicat_name>
Solving Oracle GoldenGate Error OGG-01184: Expected 4 Bytes but Got 0 Bytes in Trail
Introduction: The Silent Corruption of Transaction Logs
If you are reading this, you have likely just encountered a nightmare scenario for any data replication engineer. Your Oracle GoldenGate (OGG) Replicat process has aborted with the cryptic message: Navigate to the trail directory and delete or
Checkpoint Mismatch: Sometimes, the input checkpoint position for a Pump or Replicat is greater than the actual physical size of the trail file, leading the process to seek data that does not exist.
feature to rebuild the corrupt target trail from the source. Oracle Help Center Stop the process.
- Determine the Integrity of the Source:
Since this is an Extract (Source Capture), we must check if the transaction is still available in the Database Logs (Redo/Archive logs
