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ogg-01184 expected 4 bytes but got 0 bytes in trail
on the Extract to start a fresh trail file and then reposition the Pump/Replicat to start from that new file. Clear Checkpoints
Save the file and start the Replicat. Note: Remove temporary parameters once the process successfully moves past the broken file. Best Practices to Prevent OGG-01184
If the length field instructs the process to seek forward to find the 4-byte record trailer token, but it hits the physical End-of-File (EOF) immediately (returning 0 bytes), Oracle GoldenGate throws OGG-01184 . The process terminates instantly to protect data integrity and avoid skipping data silently. 🛠️ Common Root Causes Technical Scenario ogg-01184 expected 4 bytes but got 0 bytes in trail
: Ensure no other process (e.g., a secondary Extract) is accidentally writing to the same trail file, which can overwrite data and cause corruption. Oracle Communities Resolution Guide Option 1: Repositioning (Most Common Fix)
Use the N (next) or SCAN commands to read the headers and identify exactly where the file cuts off. ⚠️ Important Considerations: Data Consistency
If the primary Extract process abends while writing to the trail, it may not properly close the file or flush the final record. The last few bytes—including the 4-byte header for the next record—are missing, leaving the trail file truncated. ogg-01184 expected 4 bytes but got 0 bytes
Ensure stable connectivity to prevent partial transfers by the Pump process. OGG-01184 - Oracle GoldenGate Error Messages
Storage area network (SAN) drops, bad sectors, or NFS mount caching issues can corrupt data blocks, leading to mismatched byte alignments. Step-by-Step Resolution Strategy Step 1: Diagnose the Exact Corruption Point
If the trail is irrecoverable, use ADD EXTRACT with a new beginning sequence. Best Practices to Prevent OGG-01184 If the length
Look for lines indicating the file name (e.g., ./dirdat/et000123 ) and the last successfully read RBA. Step 2: Inspect the Trail File Using Logdump
The source Extract is generating a trail format that the target Replicat does not understand.
: The process reached the end of the trail file earlier than expected, often because a previous write operation (by an Extract or Pump) was interrupted before the record trailer could be written. Checkpoint Mismatch