Repair Logger Data Corruption

Introduction

Frequent write activity on the zimbra_logger.raw_logs table cause it to be subject index corruption certain conditions. Those conditions include but may not be limited to 100% disk utilization, abrupt end to the MySQL logger process, or other system failure. If the logger database is experiencing corruption, the raw_logs table is the likely culprit, however other tables can be affected as well. Trouble with the logger database is reported in /opt/zimbra/logger/db/data/hostname.err.

Impact

Any data or index corruption on the logger DB will result in inaccurate or missing statistics.

Solution

Diagnose problematic table hostname.err

070927 14:30:01 [ERROR] /opt/zimbra/logger/mysql/libexec/mysqld: Table './zimbra_logger/raw_logs' is marked as crashed and last (automatic?) repair failed

Attempt table repair

$ logmysql zimbra_logger
mysql> REPAIR TABLE raw_logs;

Repair table by writing a new index file

This repair method creates a new .MYI index file using the .frm file for the table. Use this option only as a last resort.

mysql> REPAIR TABLE raw_logs USE_FRM;

Related Articles

Mysql Crash Recovery

References

MySQL 5.0 Reference Manual http://dev.mysql.com/doc/refman/5.0/en/repair-table.html



Keywords: logger, database, mysql, error, raw_logs, corrupt, index

Verified Against: Zimbra Collaboration Suite 4.5.9 Date Created: 11/25/2007
Article ID: https://wiki.zimbra.com/index.php?title=Repair_Logger_Data_Corruption Date Modified: 2007-11-26



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