Include Locks around INSERT Statements in mysqldump

The mysqldump command in MySQL is used to create backups of databases. One of its options, --add-locks, includes locks around INSERT statements during the dumping process. This option ensures that while the dump is in progress, other sessions cannot modify the tables being dumped, thus maintaining data consistency.

Here are several examples of how to use mysqldump with the --add-locks option:

Example 1: Dumping a single database named ‘example_db’ with locks added around INSERT statements:

            mysqldump --add-locks example_db > example_db_backup.sql
        

This command creates a SQL dump file named example_db_backup.sql containing the backup of the database ‘example_db’ with locks applied to INSERT statements.

Example 2: Dumping all databases on the MySQL server with locks:

            mysqldump --all-databases --add-locks > all_databases_backup.sql
        

This command dumps all databases on the server into all_databases_backup.sql with INSERT locks enabled, ensuring data integrity across multiple databases during the dump process.

Example 3: Dumping a specific table ‘users’ from database ‘app_db’ with locks:

            mysqldump --add-locks app_db users > app_db_users_backup.sql
        

Here, the command creates a backup file named app_db_users_backup.sql containing the ‘users’ table from the ‘app_db’ database with locks around its INSERT statements.

Example 4: Dumping a database over SSH connection with locks:

            mysqldump --add-locks -h remote_server -u remote_user -p remote_db > remote_db_backup.sql
        

This command connects to a remote MySQL server ‘remote_server’ and dumps the database ‘remote_db’ into remote_db_backup.sql with locks applied to INSERT statements.

Example 5: Dumping a database and compressing output with locks:

            mysqldump --add-locks --opt example_db | gzip > example_db_backup.sql.gz
        

Here, the output of mysqldump for ‘example_db’ is piped through gzip to compress it into example_db_backup.sql.gz, ensuring INSERT locks are maintained throughout the process.

To verify if the --add-locks option is effectively applied, you can examine the SQL dump file created. Look for INSERT statements in the file; each INSERT statement should be wrapped with lock commands that prevent concurrent modifications to the data being dumped. This verification ensures that the integrity of the dumped data is preserved during and after the backup process.

Read Also

Adding DROP TRIGGER Statements in mysqldump Output
Include DROP TABLE Statements in mysqldump Output
Add DROP DATABASE Statements in mysqldump Output
Omit Tablespace Information in mysqldump Output
Using Custom Configuration Files with mysqldump