How to use the command mysqlbinlog (with examples)
The mysqlbinlog command is a utility used for processing MySQL binary log files. It allows users to view the events and entries stored in the binary log files.
Use case 1: Show events from a specific binary log file
Code:
mysqlbinlog path/to/binlog
Motivation: This use case is useful when you want to examine the events stored in a specific binary log file. By using the mysqlbinlog command followed by the path to the binary log file, you can easily view the log events.
Explanation:
mysqlbinlog: The command itself.path/to/binlog: The path to the binary log file you want to view.
Example output:
#190117 23:39:46 server id 1 end_log_pos 1205243 Query thread_id=3 exec_time=0 error_code=0
SET TIMESTAMP=1547799586/*!*/;
BEGIN
/*!*/;
# at 1205243
#190117 23:39:46 server id 1 end_log_pos 1205296 Xid = 55
COMMIT/*!*/;
...
Use case 2: Show entries from a binary log for a specific database
Code:
mysqlbinlog --database database_name path/to/binlog
Motivation: If you want to focus on the events related to a specific database, this use case is handy. By specifying the database name using the --database option, you can filter out other irrelevant log entries.
Explanation:
mysqlbinlog: The command itself.--database database_name: Specify the database name for filtering.path/to/binlog: The path to the binary log file you want to view.
Example output:
BEGIN
/*!*/;
# at 1205243
#190117 23:39:46 server id 1 end_log_pos 1205296 Xid = 55
COMMIT/*!*/;
...
Use case 3: Show events from a binary log between specific dates
Code:
mysqlbinlog --start-datetime='2022-01-01 01:00:00' --stop-datetime='2022-02-01 01:00:00' path/to/binlog
Motivation: When you want to examine the events within a specific date range, this use case can come in handy. By specifying the start and stop datetimes using the --start-datetime and --stop-datetime options respectively, you can narrow down the log entries.
Explanation:
mysqlbinlog: The command itself.--start-datetime='2022-01-01 01:00:00': Specify the start datetime for filtering.--stop-datetime='2022-02-01 01:00:00': Specify the stop datetime for filtering.path/to/binlog: The path to the binary log file you want to view.
Example output:
#210101 01:00:01 server id 1 end_log_pos 214 Query thread_id=3 exec_time=0 error_code=0
SET TIMESTAMP=1640998801/*!*/;
BEGIN
/*!*/;
#210101 01:00:01 server id 1 end_log_pos 349 Xid = 5
COMMIT/*!*/;
...
Use case 4: Show events from a binary log between specific positions
Code:
mysqlbinlog --start-position=100 --stop-position=200 path/to/binlog
Motivation: This use case is helpful when you want to examine the events within a specific position range in the binary log file. By specifying the start and stop positions using the --start-position and --stop-position options respectively, you can easily narrow down the log entries.
Explanation:
mysqlbinlog: The command itself.--start-position=100: Specify the start position for filtering.--stop-position=200: Specify the stop position for filtering.path/to/binlog: The path to the binary log file you want to view.
Example output:
#190117 23:39:46 server id 1 end_log_pos 120293 Gtid 0-1-1 Query thread_id=3 exec_time=0 error_code=0
SET TIMESTAMP=1547799586/*!*/;
BEGIN
/*!*/;
#190117 23:39:46 server id 1 end_log_pos 120348 Xid = 54
COMMIT/*!*/;
...
Use case 5: Show binary log from a MySQL server on the given host
Code:
mysqlbinlog --host=hostname path/to/binlog
Motivation: If you are working with a remote MySQL server and want to view the binary log events, this use case will be useful. By specifying the host name of the server using the --host option, you can connect to the server and retrieve the binary log.
Explanation:
mysqlbinlog: The command itself.--host=hostname: Specify the host name where the MySQL server is located.path/to/binlog: The path to the binary log file you want to view.
Example output:
#190117 23:39:46 server id 1 end_log_pos 120292 Query thread_id=2 exec_time=0 error_code=0
SET TIMESTAMP=1547799586/*!*/;
BEGIN
/*!*/;
#190117 23:39:46 server id 1 end_log_pos 120347 Gtid 0-1-1 Xid = 53
COMMIT/*!*/;
...
Conclusion:
The mysqlbinlog command is a versatile utility for interacting with MySQL binary log files. It provides multiple options to filter log events based on specific criteria such as database, date, and position. By utilizing these use cases, users can effectively analyze and troubleshoot MySQL databases using the binary log data.
