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

Start the process and monitor the view report output to confirm it successfully bypassed the broken boundary. Method B: Regenerate the Damaged Trail Segment

The error in Oracle GoldenGate—typically phrased as "Expected 4 bytes, but got 0 bytes in trail" —is a critical failure indicating that a process (usually a Pump or Replicat) cannot find the expected record trailer token at a specific Relative Byte Address (RBA) in the trail file. Core Cause: Trail File Corruption

trail file /u01/gg/dirdat/rt000012, at RBA 4820192

GGSCI> SEND EXTRACT <ext_name> STATUS GGSCI> INFO EXTRACT <ext_name>, SHOWCH ogg-01184 expected 4 bytes but got 0 bytes in trail

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 or chunks , each with a specific header and payload.

EOF encountered No more records

Force the source process to start a new, healthy trail file. (e.g., the Extract or Pump). Start the process and monitor the view report

For database administrators and data engineers working with Oracle GoldenGate (OGG), few things are as frustrating as a replication process that suddenly abends (abnormally ends) with a cryptic error message. One such notorious error is , accompanied by the phrase expected 4 bytes but got 0 bytes in trail .

Before fixing the error, you must understand what GoldenGate is trying to read. A trail file (e.g., dirdat/rt000001 ) is a binary sequence of records. Each record represents a database operation (INSERT, UPDATE, DELETE, DDL). The structure is:

Configure system monitoring agents to trigger alerts when the disk partition containing your dirdat/ trail directory exceeds 80% capacity . A trail file (e

The complete error syntax typically looks like this in the Oracle GoldenGate error log: ERROR OGG-01184 Expected 4 bytes, but got 0 bytes, in trail ./dirdat/et000015, seqno 15, reading record trailer token at RBA 246849346.

When faced with OGG-01184, the standard action recommended by Oracle is to , as the trail may be irrecoverably corrupted. However, seasoned DBAs often use the following manual recovery steps:

If multiple records are corrupted and data integrity is paramount, the safest route is to back up old trails, recreate the Extract and trail groups, and resynchronize the data entirely to ensure no gaps exist. OGG-01184 - Oracle GoldenGate Error Messages

cd $OGG_HOME ./logdump logdump> open /u01/gg/dirdat/rt000012 logdump> ghdr on logdump> detail on logdump> pos 4820192 logdump> n