From Goldengate Capture — Ogg Capture Client Successfully Detached

In any Oracle GoldenGate (OGG) environment, managing capture processes is a routine but critical task. One operation that often raises questions is detaching an OGG capture client from an existing GoldenGate capture. Recently, I performed this operation successfully, and in this post, I’ll walk through what detachment means, why you might need it, and how to do it cleanly.

oggadmin> INFO CAPTURE <capture_name> DETAIL

Look for Attachment Status: DETACHED or Client: NONE.

This message is most frequently observed in three scenarios:

No. This is an Informational Message.

If the message says "successfully detached," it implies the operation completed without errors. The Extract process has cleanly severed the link with the database.

| Message ID | Text | |------------|------| | OGG-00998 | Capture client failed to attach | | OGG-00999 | Capture client detached (this message) | | OGG-00446 | Network read failure (often precedes detach) | | OGG-01296 | Capture client process died unexpectedly |

This message can appear in four distinct operational circumstances. We classify them as "Good," "Neutral," and "Bad." In any Oracle GoldenGate (OGG) environment, managing capture

If you see a detach message that you didn’t initiate, you need to check the lines immediately above and below it.

Example of a problematic sequence:

2025-05-23 14:00:01 ERROR OGG-02717 Unable to allocate LogMiner session.
2025-05-23 14:00:01 INFO  OGG-06408 OGG capture client successfully detached...

Here, the detach is secondary. The primary issue is the LogMiner allocation failure. The detach is just the cleanup response. Look for Attachment Status: DETACHED or Client: NONE

You have configured the IDLETIMEOUT parameter in your Extract parameter file (e.g., IDLETIMEOUT 30 meaning 30 minutes). If the Extract has no changes to process for that duration, it will automatically detach from the database capture process to free up resources.

When new redo logs arrive, it will reattach automatically.

Verdict: Expected behavior if you intentionally set IDLETIMEOUT. Verify your design. This message can appear in four distinct operational