Dumping Replica Position in mysqldump Output

The mysqldump command is used to create backups of MySQL databases. One of its options, --dump-replica[=#], allows you to include information about the replica position in the output of the dump. This option is particularly useful in scenarios where you need to synchronize data between MySQL replicas or when you want to ensure consistency across distributed database systems.

Here are several examples demonstrating the usage of --dump-replica in mysqldump:

Example 1: Dumping with replica position information:

mysqldump --dump-replica mydatabase > mydatabase_dump.sql
        

This command dumps the database mydatabase to mydatabase_dump.sql while including information about the replica position.

Example 2: Specifying a specific replica number:

mysqldump --dump-replica=2 mydatabase > mydatabase_replica2_dump.sql
        

Here, --dump-replica=2 specifies that we want to include information from replica number 2 in the dump file.

Example 3: Dumping multiple databases with replica position:

mysqldump --dump-replica mydatabase1 mydatabase2 > multi_database_dump.sql
        

This command dumps both mydatabase1 and mydatabase2 to multi_database_dump.sql with replica position information.

Example 4: Using compression with replica information:

mysqldump --dump-replica --compress mydatabase > mydatabase_replica_dump.sql.gz
        

Here, the dump is compressed using gzip (.gz) format while including replica position information.

Example 5: Dumping a single table with replica position:

mysqldump --dump-replica mydatabase mytable > mytable_replica_dump.sql
        

This command specifically dumps mytable from mydatabase with replica position included.

Example 6: Dumping with extended-insert and replica information:

mysqldump --dump-replica --extended-insert mydatabase > mydatabase_extended_dump.sql
        

The --extended-insert option enhances efficiency by using multiple-row INSERT statements, combined with replica position data.

Example 7: Dumping with timestamp for replica position:

mysqldump --dump-replica=timestamp mydatabase > mydatabase_replica_timestamp_dump.sql
        

Using --dump-replica=timestamp includes a timestamp indicating the last replica position in the dump.

Example 8: Dumping with stored procedures and replica position:

mysqldump --dump-replica --routines mydatabase > mydatabase_replica_routines_dump.sql
        

This command dumps mydatabase along with its stored procedures (--routines) and includes replica position information.

Example 9: Dumping with table structure and replica position:

mysqldump --dump-replica --no-data mydatabase > mydatabase_replica_structure.sql
        

Using --no-data excludes data from the dump, focusing only on the structure of mydatabase with replica information.

Example 10: Dumping with specific character set and replica info:

mysqldump --dump-replica --default-character-set=utf8 mydatabase > mydatabase_replica_utf8.sql
        

This command ensures the dump of mydatabase uses UTF-8 character set (--default-character-set=utf8) and includes replica position data.

To verify if the mysqldump command executed successfully with the --dump-replica option, you can check the content of the generated dump file using a text editor or by examining the beginning lines of the file for comments indicating replica position information. For instance, look for lines similar to:

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=123456789;
        

This line specifies the log file and position on the replica from which the database was dumped.

Also check similar articles.

Disabling Keys in mysqldump Output
Deleting Master Logs in mysqldump (Deprecated)
Rotating Logs Before Backup in mysqldump
Setting Default Character Set in mysqldump
Debug Information in mysqldump