Ogg Capture Client Success((free)) Fully Detached From — Goldengate Capture
The message "OGG capture client successfully detached from GoldenGate capture"
typically appears in the GoldenGate error log or report files when an Integrated Capture (IC) process terminates
. While "successfully detached" sounds positive, in the context of an abended (failed) process, it indicates that the GoldenGate Extract has disconnected from the database’s logmining server. Oracle Forums 1. Understanding the Message
This message is an informational confirmation that the link between the Extract process Logmining Server (inside the Oracle database) has been severed. Oracle Forums Why it occurs:
It usually follows a primary error (like OGG-00664, OGG-01044, or OGG-01668) that caused the Extract to stop. Significance:
It confirms that the database resources used by the capture process (memory in the STREAMS_POOL , background processes) have been released. 2. Common Causes for Detachment
If this occurs unexpectedly (i.e., the process "abends"), look for these root causes in the report file ( view report [extract_name] Streams Pool Exhaustion: The database STREAMS_POOL_SIZE
is too small to handle the volume of redo data, forcing the logmining server to shut down. Database Shutdown/Maintenance:
If the source database or an instance (in RAC) goes down, the capture client is forced to detach. Archive Log Unavailability:
The Extract cannot find the next required redo or archive log because it was deleted or moved. Unassigned Trail Files:
Errors like OGG-01044 occur if the Extract parameter file refers to a trail that hasn't been officially added via 3. Step-by-Step Troubleshooting Guide Follow these steps to diagnose and restart the process: Step 1: Identify the Primary Error The "detached" message is rarely the root cause. Review the ggserr.log
(found in the OGG home directory) or the process report file to find the actual error that preceded the detachment. www.oracle-scn.com GGSCI> view report [EXTRACT_NAME] Use code with caution. Copied to clipboard Step 2: Check Database Health
Verify that the Logmining server is still healthy and check the database alert logs for errors related to GoldenGate or Streams. Oracle Forums -- Check capture status in the database capture_name, status, error_number, error_message dba_capture; Use code with caution. Copied to clipboard Step 3: Increase Memory (If Needed) If you see "Waiting for memory" or STREAMS_POOL errors, increase the pool size: Oracle Forums streams_pool_size = [NewSize] SCOPE=BOTH; Use code with caution. Copied to clipboard Step 4: Clean Up "Hung" Processes
Sometimes the detachment is incomplete. You may need to manually unregister and re-register the Extract if it won't restart. Unregister: UNREGISTER EXTRACT [EXTNAME] DATABASE Re-register: REGISTER EXTRACT [EXTNAME] DATABASE Step 5: Restart the Extract
Once the underlying issue (missing logs, memory, etc.) is fixed, restart the process: Oracle Help Center GGSCI> start extract [EXTRACT_NAME] Use code with caution. Copied to clipboard 4. Prevention Strategies Configure Autorestart: AUTORESTART
parameter in the Manager file to automatically recover from temporary network or log access issues. Monitor Streams Pool: Regularly check V$STREAMS_POOL_ADVICE
to ensure the database has enough memory to support integrated capture. Manage Archive Logs:
Ensure RMAN or other cleanup scripts do not delete logs until GoldenGate has finished processing them. Oracle Help Center specific SQL queries to check for hung LogMiner sessions or a template for an autostart configuration Clean up old Extracts - DBASolved 10 Apr 2022 —
For many using Oracle GoldenGate, there is a need to test out the desired configurations in a dev, test, or even a QA environment. Clean up old Extracts - DBASolved 10 Apr 2022 —
The "OGG capture client successfully detached from GoldenGate capture" message indicates a clean, planned disconnection between the Oracle GoldenGate Extract process and the source database. It is a standard status notification typically caused by a manual stop command or a routine configuration change [1].
OGG Capture Client Detachment Confirmation
The Oracle GoldenGate (OGG) capture client has been successfully detached from the GoldenGate capture process.
What does this mean?
This message indicates that the OGG capture client, which is responsible for capturing data changes from a source database, has been cleanly separated from the GoldenGate capture process. This detachment is a normal operation that can occur for various reasons, such as maintenance, troubleshooting, or configuration changes.
Implications
The successful detachment of the OGG capture client from the GoldenGate capture process implies that:
- No further data changes will be captured: The capture client will no longer receive data changes from the source database.
- Data replication will be paused: Any ongoing data replication processes will be paused until the capture client is reattached or reconfigured.
Next Steps
To resume data replication, you may need to:
- Verify the detachment reason: Check the system logs and configuration files to understand why the detachment occurred.
- Reattach the capture client: If necessary, reattach the capture client to the GoldenGate capture process.
- Reconfigure the capture client: If required, reconfigure the capture client to ensure proper data replication.
Troubleshooting Tips
If you encounter issues during or after the detachment, refer to the Oracle GoldenGate documentation and troubleshooting guides for assistance.
By confirming the successful detachment of the OGG capture client, you can ensure that your data replication processes are properly managed and resumed if necessary. The message "OGG capture client successfully detached from
Understanding the "OGG Capture Client Successfully Detached from GoldenGate Capture" Message
In the world of Oracle GoldenGate (OGG), log messages are the primary window into the health and status of your data replication environment. One message that frequently appears in the Oracle alert logs and GoldenGate process logs is: "OGG capture client successfully detached from GoldenGate capture."
While this message sounds like a technical failure at first glance, it is often a routine part of the GoldenGate lifecycle. This article explores what this message means, why it occurs, and when you should actually be concerned. What Does This Message Mean?
Oracle GoldenGate uses an Extract process to capture changes from the source database. In modern "Integrated Capture" modes, the Extract process acts as a client to a specialized background process within the Oracle Database known as the LogMiner Capture process.
When you see the message "OGG capture client successfully detached," it indicates that the Extract process (the client) has gracefully severed its connection with the database’s capture engine.
Essentially, the database is acknowledging that the GoldenGate process has stopped requesting data and the session has been closed cleanly. Common Scenarios Where This Occurs
In most cases, this message is a confirmation of a successful administrative action rather than an error. Here are the most common triggers: 1. Manual Stopping of the Extract
If an administrator issues the STOP EXTRACT command in GGSCI or the Admin Client, the process will finish its current work and detach from the database. The database then logs this detachment to confirm the resources have been released. 2. Extract Process Restart
When you restart an Extract, it must first shut down the old session. You will see a "detached" message for the stopping process, followed shortly by a "bound" or "attached" message for the new process. 3. Network or Timeout Issues
If there is a brief network flicker between the GoldenGate hub and the database server, the client might detach. If GoldenGate is configured with AUTORESTART, it may reconnect so quickly that you only notice the detachment message in the logs. 4. Database Maintenance
If the source database is being shut down or put into a state where the LogMiner server is no longer available, the GoldenGate client will be forced to detach. Is it an Error? How to Tell.
To determine if this message requires action, you must look at the context of the logs. Situation A: Normal (No Action Required)
Log Sequence: You see "Stopping Extract," followed by "Successfully detached," followed by the process status showing as STOPPED. Reason: This is a standard clean shutdown. Situation B: Critical (Action Required)
Log Sequence: You see "Successfully detached," followed immediately by ERROR OGG-00664 or OGG-01031, and the process status shows as ABENDED.
Reason: This implies the detachment was involuntary. Something—like a database crash, a memory exhaustion issue (SGA/Streams Pool), or a permissions change—forced the client off. Troubleshooting Forced Detachments
If your Extract is abending (crashing) with this message, follow these steps:
Check the Database Alert Log: The source database often has more information. Look for ORA-errors (like ORA-01341: LogMiner out of memory) occurring at the exact same timestamp.
Verify Streams Pool: Integrated Capture lives in the Streams Pool. If the STREAMS_POOL_SIZE is too small, the database may kick the GoldenGate client to save system stability.
Check Extract Long-Running Transactions: A single massive transaction can cause the capture client to struggle. Use SEND EXTRACT to see if a specific transaction is causing a bottleneck.
Review Patch Levels: Detachment issues are occasionally linked to bugs in the LogMiner engine. Ensure both your GoldenGate home and your Oracle Database have the latest "Database Release Update" (RU).
The message "OGG capture client successfully detached from GoldenGate capture" is, by itself, a sign of a healthy, communicative relationship between GoldenGate and the Oracle Database. It confirms that the session ended without leaving "zombie" processes or orphaned locks in the database.
However, if you see this message appearing repeatedly or accompanied by an ABENDED status, it is a red flag to investigate your database’s Streams Pool memory and LogMiner health.
The message "ogg capture client successfully detached from goldengate capture" is a standard informational log entry in Oracle GoldenGate. It indicates that an Extract process (the "capture client") has cleanly disconnected from the database logmining server. Overview of the Message
In Integrated Capture mode, the Extract process does not read redo logs directly; instead, it communicates with a logmining server within the Oracle database. This message confirms that the handshake between GoldenGate and the database has ended gracefully.
Normal Behavior: You will typically see this when you manually issue a STOP EXTRACT command in GGSCI. It confirms the process stopped as intended without leaving "hung" sessions in the database.
Troubleshooting Context: If this message appears without a manual stop command, it may indicate a timeout or a network drop between the GoldenGate hub and the source database. Key Observations for Review
When reviewing this log entry, consider the following environmental factors:
Process Mode: This specific message is characteristic of Integrated Capture, where GoldenGate acts as a client to the database's internal logmining engine.
Database Cleanup: Successful detachment is critical. If the client fails to detach (e.g., during a crash), the database may continue to hold archive logs, leading to RMAN-08137 errors because the database believes the logs are still needed by a downstream process.
Root Cause Analysis: If the detachment was unexpected, check the database audit logs or DBA_AUDIT_LOG to see if a privileged user or scheduled process triggered a shutdown. Common Community Perspectives No further data changes will be captured :
“That shutdown was issued by either a scheduled process, or a human... sitting at a keyboard. That IS your "root cause".” Oracle Forums · 8 years ago
“If this is the case go grab your network admin, could be a firewall thing then... your communication link basically dropped out.” Oracle Forums · 9 years ago Comparison of Capture Methods Classic Capture Integrated Capture Log Reading Directly from redo/archive logs Interacts with logmining server Detachment Local file system disconnect Client-server detachment from DB Complexity Simple, but restricted data types High integration, supports RAC/ASM/TDE Root Cause for Database Shutdown - Oracle Forums
In Oracle GoldenGate (OGG), the message "OGG Capture Client successfully detached from GoldenGate Capture"
typically appears in the database alert logs or OGG report files when an Integrated Extract process stops
. This confirms a clean shutdown of the handshaking between the OGG Extract process and the database's LogMiner server. Oracle Forums Review of Process Detachment Normal Lifecycle : This is a standard confirmation message during a manual STOP EXTRACT
command or a graceful system shutdown. It indicates that the
server, which mines redo logs for the Extract, has successfully closed its session with the OGG client. Oracle Forums Integrated Architecture
: In Integrated Capture mode, the Extract process does not read redo logs directly; instead, it attaches to a database-level LogMiner server. A "successful detachment" means all Logical Change Records (LCRs)
currently in the pipeline were processed or safely checkpointed before the connection was severed. www.oracle-scn.com Monitoring Significance
: While usually benign, seeing this message unexpectedly—without a manual stop command—can signal that the OGG process or the underlying database session was killed or terminated by a resource manager. Oracle Blogs Troubleshooting if Unexpected If the detachment occurs frequently or leads to an status, consider these steps: OGG-02028 - Oracle GoldenGate Capture for Oracle 20 Oct 2016 —
GoldenGate Capture: OGG$CAP_PEX00001. setting IGNORE_UNSUPPORTED_TABLE for table (*) Wed Oct 19 08:00:53 2016. GoldenGate Capture: Oracle Forums
Understanding the "OGG Capture Client Successfully Detached" Message In Oracle GoldenGate (OGG), seeing the message "OGG capture client successfully detached from GoldenGate"
in your database alert logs or GoldenGate report files can be alarming, but it is often a routine part of the process lifecycle. The Core Mechanism This message is generated by the
component within the Oracle Database. In an Integrated Capture setup, the GoldenGate Extract process doesn't read the redo logs directly; instead, it acts as a client to a database-level "Capture Server."
When the Extract process stops—whether due to a manual command, a scheduled restart, or an error—it sends a signal to the database to release the resources it was using. The "detachment" is the database confirming that the session between the Extract and the LogMiner engine has been cleanly closed. When It’s Normal You will typically see this message during: Graceful Shutdowns: When you issue STOP EXTRACT Process Restarts: During maintenance windows or configuration changes. Idle Timeouts:
If the Extract is configured to disconnect when no data is being processed.
In these scenarios, the detachment ensures that System Global Area (SGA) memory is freed and that the database doesn't keep a "zombie" capture session active, which could prevent the deletion of old archived logs. When It’s a Problem
If this message appears unexpectedly while the Extract should be running, it indicates an abnormal termination . The detachment is a , not the cause. You should investigate: Extract Abends: $GG_HOME/dirrpt/
file. The Extract may have hit a memory limit or a mapping error. Database Resource Pressure:
If the database instance is low on streams pool memory, it may forcibly detach the client. Network Instability:
In "Downstream Capture" setups, a network flicker between the source and mining databases will trigger a detachment. Conclusion
Think of this message as a "Goodbye" handshake. It confirms the database has successfully cleaned up after a GoldenGate process. If the stop was intentional, the message is proof of a healthy system. If it was unintentional, it serves as the timestamp for when your replication halted, guiding you to look deeper into the Extract’s specific error logs. database alert logs
to see if there was a specific error code paired with this detachment? AI responses may include mistakes. Learn more
In Oracle GoldenGate (OGG), the message "OGG capture client successfully detached from GoldenGate capture"
is generally a positive status update rather than an error. It signifies that a "capture client" (typically an process) has cleanly disconnected from the underlying Logmining Server in the database. This usually happens during a controlled shutdown or a planned restart of the Extract process. Review: OGG Capture Client Detachment Status Status Summary: Message Type: Informational / Lifecycle Significance:
High. It confirms that the integrated capture process didn't just crash; it successfully communicated its departure to the database's logmining server. Process Impact:
None (if intentional). The database will now hold onto the required redo logs until the client re-attaches, preventing data loss. Common Scenarios for this Message: Manual Stop: You issued a STOP EXTRACT command in GGSCI. Maintenance:
The database is shutting down, and OGG processes are detaching to preserve state. Automated Restarts:
A script or manager process is recycling the Extract for performance or log rotation reasons. What to Check if this was Unexpected: Alert Logs: Oracle Alert Log for corresponding SHUTTING DOWN WAITING FOR CLIENT REQUESTS messages from the V$GOLDENGATE_CAPTURE Report Files: VIEW REPORT command to see if a fatal error occurred the detachment. Process Status: INFO EXTRACT
Was this detachment part of a planned maintenance window, or did it happen unexpectedly during live replication? Root Cause for Database Shutdown - Oracle Forums Next Steps To resume data replication, you may need to:
Either Oracle is correct & client is mistaken. or. Client is correct & Oracle has a bug & you need to submit Bug Report to Oracle. Oracle Forums V$GOLDENGATE_CAPTURE - Oracle Help Center
Blog: Understanding the "OGG Capture Client Successfully Detached" Message
If you are monitoring your Oracle GoldenGate (OGG) environment and spot the message "OGG Capture client successfully detached from GoldenGate Capture" in your database alert logs or GoldenGate report files, you might wonder if something has gone wrong.
Here is a quick guide on what this message means and how to handle it. What Does This Message Mean?
This message is typically informational rather than an error. In an Integrated Capture setup, the GoldenGate Extract process acts as a "client" to the database's LogMiner server.
When the Extract process stops—whether manually, due to a scheduled maintenance window, or because of a database shutdown—it "detaches" from the mining server. The message confirms that the handshake between GoldenGate and the database engine has ended cleanly. Common Scenarios Manual Stop: You issued a STOP EXTRACT command in GGSCI.
Database Shutdown: The database was closed or restarted, forcing the capture process to disconnect.
Process Abending: If accompanied by an error (like OGG-01668), it indicates the process stopped unexpectedly due to a missing trail file or privilege issue. Troubleshooting Steps
If this message appeared unexpectedly and your Extract is now in an ABENDED status, follow these steps to diagnose the root cause: OGG-02028 - Oracle GoldenGate Capture for Oracle
This message indicates that an Oracle GoldenGate (OGG) Extract process has successfully disconnected from the source database. 📌 Meaning of the Message
Successful shutdown: The Extract process was stopped normally by a user or script.
Database disconnection: The GoldenGate capture client detached cleanly from the Oracle database.
No action required: This is an informational message (INFO), not an error. 🔍 Common Causes
Manual Stop: An administrator issued the STOP EXTRACT command.
System Maintenance: The GoldenGate instance or the source database was being restarted.
Graceful Exit: The process reached a specified end point (e.g., THREAD or EOF) and closed safely. 🛠️ Related GGSCI Commands
To check the current status or restart the process, use these commands in the GGSCI or Admin Client console: View status: STATUS EXTRACT Start process: START EXTRACT View logs: VIEW REPORT 💡 Best Practices
Verify state: Ensure the extract is in a STOPPED state and not ABENDED.
Check alert logs: If this happened unexpectedly, review the GoldenGate ggserr.log for preceding events.
Step 4: Validate Network and Firewall Timers
Long-running idle connections may be terminated by firewalls or load balancers. Ensure your IDLETIMEOUT in OGG is set lower than any network idle timeout (e.g., IDLETIMEOUT 10 minutes if firewall times out at 15 minutes).
Summary
The message "OGG capture client successfully detached from GoldenGate capture" is the GoldenGate equivalent of a polite employee clocking out. It indicates that the Extract process has cleanly disconnected its session from the Oracle LogMiner server.
Key Takeaways:
- Severity: Informational / Normal.
- Action Required: None, unless followed by an abend or crash.
- Meaning: Clean resource cleanup between GoldenGate and the Oracle Database.
As a GoldenGate Administrator, seeing this message during a STOP command should bring comfort, knowing that your process is shutting down cleanly without leaving zombie sessions in the database.
Here’s a technical guide to understanding and handling the OGG capture client successfully detached from GoldenGate capture message.
Part 2: Common Scenarios – When Does This Message Appear?
This message can appear in four distinct operational circumstances. We classify them as "Good," "Neutral," and "Bad."
Common Related Errors Guiding the Detach
| Error | Meaning | DBA Action |
| --------------------------------- | ------------------------------------------------- | ---------------------------------------------------------------------- |
| OGG-02912 (Insufficient SGA) | Database’s streams_pool_size too small. | Increase streams_pool_size or sga_target. Restart extract. |
| OGG-02902 (Timeout) | LogMiner server didn’t respond. | Check database alert log for bottlenecks or deadlocks. |
| OGG-06439 (No capture resources) | Too many concurrent LogMining servers. | Stop other extracts or increase MAX_SERVERS in the database config. |
In all these cases, you will see the "successfully detached" line after the failure, acting as a confirmation that the client gave up and disconnected cleanly.
The Detachment Process
When GoldenGate runs in Integrated Capture mode (the standard for modern Oracle databases), it attaches to a LogMiner session inside the database memory. This attachment allows the Extract process to stream data changes.
However, the Extract process does not hold onto this database connection 24/7 with an iron grip. To maintain database performance and stability, GoldenGate is designed to periodically "step away" or detach. When the Extract has finished processing a batch of data, or if it needs to yield resources, it disconnects its specific session from the LogMiner server.
Therefore, the message "Capture client successfully detached" simply translates to: "The GoldenGate Extract process has successfully released its hold on the database LogMiner session."
Comparison: Attached vs. Detached State
| Feature | Attached State (“Running”) | Detached State (“Stopped”) |
| --------------------------- | ------------------------------------------------------ | -------------------------------------------------------- |
| Connection to LogMiner | ACTIVE – consuming redo data. | CLOSED – no data flow. |
| Redo Log Retention | LogMiner holds logs needed by the client. | Logs are released for normal recycling. |
| Database Resource Usage | CPU & memory used by LogMiner server. | Minimal – only checkpoint table retained. |
| Extract Process | Running as OS process. | Stopped or in a waiting state (if BEGIN or END use). |