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MySQL 5.5 Reference Manual
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17.4.1.17 Replication and LOAD DATA

In MySQL 5.5.6 and later, LOAD DATA is considered unsafe for statement-based logging (see Section 17.1.2.3, “Determination of Safe and Unsafe Statements in Binary Logging”). When binlog_format=MIXED is set, the statement is logged in row-based format. When binlog_format=STATEMENT is set, note that LOAD DATA does not generate a warning, unlike other unsafe statements.

When mysqlbinlog reads log events for LOAD DATA statements logged in statement-based format, a generated local file is created in a temporary directory. These temporary files are not automatically removed by mysqlbinlog or any other MySQL program. If you do use LOAD DATA statements with statement-based binary logging, you should delete the temporary files yourself after you no longer need the statement log. For more information, see Section 4.6.7, “mysqlbinlog — Utility for Processing Binary Log Files”.