Oracle ORA-00473 Error: Causes and Solutions Complete Guide

ORA-00473: ARCH Process Terminated with Error — Causes, Fixes & Prevention

ORA-00473 occurs when Oracle's ARCH (Archiver) background process terminates unexpectedly during the archiving of online redo log files. This error is critical in ARCHIVELOG mode databases because if archiving fails, Oracle cannot reuse online redo logs, which can cause the entire database to hang. Immediate investigation and remediation are essential to restore normal operations.

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Top 3 Causes

1. Archive Log Destination Disk Full

The most common cause. When the filesystem holding archive logs runs out of space, the ARCH process fails immediately.

-- Check archive log destination and space usage
SELECT DEST_ID, DEST_NAME, STATUS, DESTINATION, ERROR
FROM V$ARCHIVE_DEST
WHERE STATUS != 'INACTIVE';

-- Check Fast Recovery Area usage
SELECT SPACE_LIMIT / 1024 / 1024 / 1024 AS LIMIT_GB,
       SPACE_USED  / 1024 / 1024 / 1024 AS USED_GB,
       ROUND(SPACE_USED / NULLIF(SPACE_LIMIT,0) * 100, 2) AS USED_PCT
FROM V$RECOVERY_FILE_DEST;

-- Delete old archive logs via RMAN (run inside RMAN client)
-- RMAN> DELETE ARCHIVELOG ALL COMPLETED BEFORE 'SYSDATE-7';

2. Invalid or Inaccessible Archive Destination Path

If LOG_ARCHIVE_DEST_n points to a non-existent directory, an unmounted NFS share, or a path with incorrect OS permissions, the ARCH process will terminate with ORA-00473.

-- Review current archive destination parameters
SHOW PARAMETER LOG_ARCHIVE_DEST;

-- Fix: update destination to a valid path
ALTER SYSTEM SET LOG_ARCHIVE_DEST_1 = 'LOCATION=/oradata/archive' SCOPE=BOTH;

-- Confirm destination status
SELECT DEST_ID, STATUS, ERROR, DESTINATION
FROM V$ARCHIVE_DEST_STATUS
WHERE DEST_ID IN (1, 2);

3. Underlying I/O or Hardware Error

Bad disk sectors, SAN/NAS failures, or OS-level filesystem corruption can all cause write failures during archiving. Always cross-check Oracle alert logs with OS system logs (/var/log/messages).

-- Find ORA-00473 entries in the alert log (Oracle 11g+)
SELECT ORIGINATING_TIMESTAMP, MESSAGE_TEXT
FROM V$DIAG_ALERT_EXT
WHERE MESSAGE_TEXT LIKE '%ORA-00473%'
   OR MESSAGE_TEXT LIKE '%ARCH%'
ORDER BY ORIGINATING_TIMESTAMP DESC
FETCH FIRST 30 ROWS ONLY;

-- Identify the alert log location
SELECT VALUE FROM V$DIAG_INFO WHERE NAME = 'Diag Trace';

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Quick Fix Solutions

After resolving the root cause (free up disk space, fix path, repair I/O), restart the ARCH process:

-- Verify current archive mode
SELECT LOG_MODE FROM V$DATABASE;

-- Restart the archiver
ALTER SYSTEM ARCHIVE LOG STOP;
ALTER SYSTEM ARCHIVE LOG START;

-- Force archiving of all unarchived logs
ALTER SYSTEM ARCHIVE LOG ALL;

-- Force a log switch to confirm archiving works
ALTER SYSTEM SWITCH LOGFILE;

-- Check ARCH process status
SELECT PROCESS, STATUS, SEQUENCE#
FROM V$MANAGED_STANDBY
WHERE PROCESS LIKE 'ARC%';

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Prevention Tips

1. Monitor archive log space proactively. Set up automated alerts when archive space exceeds 75% capacity using OEM, Zabbix, or a custom cron script. Configure RMAN retention policy to auto-clean old logs:

-- RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
-- RMAN> CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 1 TIMES TO DISK;

1. Redundant archive destinations on separate disks. Configure at least two archive destinations (LOG_ARCHIVE_DEST_1 and LOG_ARCHIVE_DEST_2) on physically separate storage to eliminate single points of failure and buy recovery time when one destination fails.

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Related Errors

Error Code	Description
ORA-00257	Archiver stuck — all non-internal connections blocked
ORA-00255	Error archiving log — often appears alongside ORA-00473
ORA-19809	Fast Recovery Area space limit exceeded
ORA-16014	Archive destination invalid or unavailable
ORA-00270	Error creating archive log file (I/O related)

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