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4.6.8.1 mysqlbinlog Hex Dump Format

The --hexdump option causes mysqlbinlog to produce a hex dump of the binary log contents:

shell> mysqlbinlog --hexdump master-bin.000001

The hex output consists of comment lines beginning with #, so the output might look like this for the preceding command:

/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
# at 4
#051024 17:24:13 server id 1  end_log_pos 98
# Position  Timestamp   Type   Master ID        Size      Master Pos    Flags
# 00000004 9d fc 5c 43   0f   01 00 00 00   5e 00 00 00   62 00 00 00   00 00
# 00000017 04 00 35 2e 30 2e 31 35  2d 64 65 62 75 67 2d 6c |..5.0.15.debug.l|
# 00000027 6f 67 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |og..............|
# 00000037 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
# 00000047 00 00 00 00 9d fc 5c 43  13 38 0d 00 08 00 12 00 |.......C.8......|
# 00000057 04 04 04 04 12 00 00 4b  00 04 1a                |.......K...|
#       Start: binlog v 4, server v 5.0.15-debug-log created 051024 17:24:13
#       at startup
ROLLBACK;

Hex dump output currently contains the elements in the following list. This format is subject to change. (For more information about binary log format, see MySQL Internals: The Binary Log.

  • Position: The byte position within the log file.

  • Timestamp: The event timestamp. In the example shown, '9d fc 5c 43' is the representation of '051024 17:24:13' in hexadecimal.

  • Type: The event type code. In the example shown, '0f' indicates a FORMAT_DESCRIPTION_EVENT. The following table lists the possible type codes.

    Type Name Meaning
    00 UNKNOWN_EVENT This event should never be present in the log.
    01 START_EVENT_V3 This indicates the start of a log file written by MySQL 4 or earlier.
    02 QUERY_EVENT The most common type of events. These contain statements executed on the master.
    03 STOP_EVENT Indicates that master has stopped.
    04 ROTATE_EVENT Written when the master switches to a new log file.
    05 INTVAR_EVENT Used for AUTO_INCREMENT values or when the LAST_INSERT_ID() function is used in the statement.
    06 LOAD_EVENT Used for LOAD DATA INFILE in MySQL 3.23.
    07 SLAVE_EVENT Reserved for future use.
    08 CREATE_FILE_EVENT Used for LOAD DATA INFILE statements. This indicates the start of execution of such a statement. A temporary file is created on the slave. Used in MySQL 4 only.
    09 APPEND_BLOCK_EVENT Contains data for use in a LOAD DATA INFILE statement. The data is stored in the temporary file on the slave.
    0a EXEC_LOAD_EVENT Used for LOAD DATA INFILE statements. The contents of the temporary file is stored in the table on the slave. Used in MySQL 4 only.
    0b DELETE_FILE_EVENT Rollback of a LOAD DATA INFILE statement. The temporary file should be deleted on the slave.
    0c NEW_LOAD_EVENT Used for LOAD DATA INFILE in MySQL 4 and earlier.
    0d RAND_EVENT Used to send information about random values if the RAND() function is used in the statement.
    0e USER_VAR_EVENT Used to replicate user variables.
    0f FORMAT_DESCRIPTION_EVENT This indicates the start of a log file written by MySQL 5 or later.
    10 XID_EVENT Event indicating commit of an XA transaction.
    11 BEGIN_LOAD_QUERY_EVENT Used for LOAD DATA INFILE statements in MySQL 5 and later.
    12 EXECUTE_LOAD_QUERY_EVENT Used for LOAD DATA INFILE statements in MySQL 5 and later.
    13 TABLE_MAP_EVENT Information about a table definition. Used in MySQL 5.1.5 and later.
    14 PRE_GA_WRITE_ROWS_EVENT Row data for a single table that should be created. Used in MySQL 5.1.5 to 5.1.17.
    15 PRE_GA_UPDATE_ROWS_EVENT Row data for a single table that needs to be updated. Used in MySQL 5.1.5 to 5.1.17.
    16 PRE_GA_DELETE_ROWS_EVENT Row data for a single table that should be deleted. Used in MySQL 5.1.5 to 5.1.17.
    17 WRITE_ROWS_EVENT Row data for a single table that should be created. Used in MySQL 5.1.18 and later.
    18 UPDATE_ROWS_EVENT Row data for a single table that needs to be updated. Used in MySQL 5.1.18 and later.
    19 DELETE_ROWS_EVENT Row data for a single table that should be deleted. Used in MySQL 5.1.18 and later.
    1a INCIDENT_EVENT Something out of the ordinary happened. Added in MySQL 5.1.18.
  • Master ID: The server ID of the master that created the event.

  • Size: The size in bytes of the event.

  • Master Pos: The position of the next event in the original master log file.

  • Flags: 16 flags. The following flags are used. The others are reserved for future use.

    Flag Name Meaning
    01 LOG_EVENT_BINLOG_IN_USE_F Log file correctly closed. (Used only in FORMAT_DESCRIPTION_EVENT.) If this flag is set (if the flags are, for example, '01 00') in a FORMAT_DESCRIPTION_EVENT, the log file has not been properly closed. Most probably this is because of a master crash (for example, due to power failure).
    02 Reserved for future use.
    04 LOG_EVENT_THREAD_SPECIFIC_F Set if the event is dependent on the connection it was executed in (for example, '04 00'), for example, if the event uses temporary tables.
    08 LOG_EVENT_SUPPRESS_USE_F Set in some circumstances when the event is not dependent on the default database.

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