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About ALTOROS: ALTOROS Systems is headquartered in Tampa, Florida and maintains an office near Boston, Massachusetts and technology development center in Belarus and Russia. ALTOROS specializes on providing value-added e-commerce and web-based software development and offshore software outsourcing services to emerging enterprises helping them successfully plan and implement business initiatives.

MySQL has several different log files that can help you find out what's going on inside mysqld:

Log file	Description
The error log	Problems encountering starting, running or stopping mysqld.
The isam log	Logs all changes to the ISAM tables. Used only for debugging the isam code.
The query log	Established connections and executed queries.
The update log	Deprecated: Stores all statements that changes data
The binary log	Stores all statements that changes something. Used also for replication
The slow log	Stores all queries that took more than long_query_time to execute or didn't use indexes.

All logs can be found in the mysqld data directory. You can force mysqld to reopen the log files (or in some cases switch to a new log) by executing FLUSH LOGS. See FLUSH.

Error log The Error Log

Query log The General Query Log

Update log The Update Log

Binary log The Binary Update Log

Slow query log The Slow Query Log

Log file maintenance Log File Maintenance