Ogg-01184 Expected 4 Bytes But Got 0 Bytes In Trail _best_ -

Solving the OGG-01184 Error: "Expected 4 Bytes But Got 0 Bytes in Trail"

2. Detailed Error Breakdown

Full error example (from GoldenGate log file, ggserr.log):

2025-05-15 10:23:45  ERROR   OGG-01184  Oracle GoldenGate Delivery for Oracle, rep1.prm:  
Expected 4 bytes but got 0 bytes in trail file /u01/ggate/dirdat/aa000123 (offset 0:0).  
Possibly the trail file is truncated, corrupted, or not properly flushed.

Key elements:

  • OGG-01184: Internal error code specific to trail file read operations.
  • Expected 4 bytes: Indicates OGG was looking for a record length header.
  • Got 0 bytes: OGG reached EOF (end-of-file) without finding the header.
  • Trail file path: Shows which file is problematic.
  • Offset: Hexadecimal notation (0:0) – the exact byte position where the read failed.

In simple terms: GoldenGate reached a point in the trail file where a new record should begin, but there was no data left to read. The file is either incomplete or malformed. ogg-01184 expected 4 bytes but got 0 bytes in trail

6.1 Monitor Disk Space Proactively

Set up alerts for the trail directory (e.g., 80% full). Use GGSCI info: Solving the OGG-01184 Error: "Expected 4 Bytes But

GGSCI> INFO EXTRACT *, TASKS
GGSCI> LAG EXTRACT *, REPLICAT *

4. Graceful Shutdown Procedures

Always stop GoldenGate processes before rebooting or unmounting filesystems: Key elements:

ggsci> STOP EXTRACT *
ggsci> STOP REPLICAT *
ggsci> STOP MANAGER

Abrupt termination is the #1 cause of “expected 4 bytes but got 0”.

6. Preventive Measures

  • Disable OS-level caching for trail files (use DIRECTIO if possible)
  • Avoid using NFS for trail storage; prefer local mount or SAN with proper locking
  • Set proper buffer parameters: 
    -- In Extract parameter file
FLUSHWARNINGMS 2000
BUFFERMB 64
  • Monitor trail usage: info extract <name>, showch
  • Regularly backup trail files during high-volume loads
  • Upgrade GoldenGate (older versions more prone to this error)

4. Step-by-Step Troubleshooting Guide

When you encounter OGG-01184, follow this systematic approach.