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

Here’s a structured incident and troubleshooting report for the Oracle GoldenGate error:

1. Understanding the Oracle GoldenGate Trail File Format

Before diving into the error, it’s essential to understand GoldenGate trail files. A trail file (e.g., dirdat/aa000001) is a binary file where GoldenGate writes captured data changes (INSERT, UPDATE, DELETE). The file is structured in records or chunks, each with a specific header and payload. ogg-01184 expected 4 bytes but got 0 bytes in trail

The 4 bytes referenced in the error message refer to the record length prefix. In OGG trail files, each logical record is preceded by a 4-byte integer that indicates the total length of the following data payload. This design allows GoldenGate processes to read the file sequentially, knowing exactly how many bytes to read for the next record. If Extract is the issue stop extract ext1

When GoldenGate’s Replicat or a downstream process tries to read a trail file, it first reads these 4 bytes. If the file is corrupted, truncated, or ends prematurely, the process might read 0 bytes instead of a valid 4-byte length header, leading to the OGG-01184 error. extrba 0 start extract ext1

If Extract is the issue

stop extract ext1 alter extract ext1, extseqno 000003, extrba 0 start extract ext1

Step 3: Check Disk Space

df -h /u01/gg/dirdat

If the disk was full at the time of writing, the trail file may be truncated. Look for files with odd sizes.