Ogg-01184 Expected 4 Bytes But Got 0 Bytes In Trail Fix 📢 📥

START EXTRACT <group_name>

Always stop GoldenGate processes cleanly ( stop extract * , stop replicat * ) before rebooting servers or performing database maintenance. Avoid using kill -9 on GoldenGate PIDs unless absolutely necessary.

The error message OGG-01184: Expected 4 bytes but got 0 bytes in trail is the Oracle GoldenGate equivalent of a "sudden death" notification. It is a low-level I/O error that indicates the Extract process reached the end of a trail file expecting to find a complete record header (4 bytes) but found nothing but empty air.

Ensure the dirdat directory has enough space to prevent partial writes. ogg-01184 expected 4 bytes but got 0 bytes in trail

The OGG-01184 Expected 4 bytes, but got 0 bytes error is one of the more serious issues you can encounter, but it is almost always recoverable. In most cases, the solution is a straightforward ALTER EXTRACT, ETROLLOVER command. However, the true lesson of this error is the importance of building a resilient GoldenGate infrastructure. By focusing on stable storage, regular maintenance, and a solid backup plan, you can protect your replication pipelines from the disruption of trail file corruption.

Whitelist the dirdat directory in all anti-virus, malware scanners, and OS backup scripts to avoid file-locking conflicts.

: Ensure PURGEOLDEXTRACTS with MINKEEP is configured on the source so trail files aren't deleted before they can be used for recovery. It is a low-level I/O error that indicates

on the Extract to start a fresh trail file and then reposition the Pump/Replicat to start from that new file. Clear Checkpoints

Delete the corrupted trail file and any subsequent files in that sequence on the target. Restart the Extract Pump

If the local trail on the source is corrupted, you must re-position the Extract process to a point in the database logs (SCN or timestamp) prior to the corruption and regenerate the trails. Prevention Best Practices In most cases, the solution is a straightforward

on Linux) and compare it against the RBA where the error occurred. Reposition the Process:

Replicat process fails with the following in the error log:

Take note of the sequence number ( 7 ) and the Relative Byte Address ( 246849346 ). Step 2: Analyze the Trail with Logdump

When a process reads a trail file and encounters instead of the expected 4 bytes, it means the process hit an unexpected End-of-File (EOF) or a block of null/empty data right where a valid data header was supposed to be. Common Causes of OGG-01184