Syncs two mysql databases by only inserting/deleting/updating the necessary records.

Useful in cases where mysqldump generates gigabytes of data

##Usage:

mysql-sync [source-dsn] [target-dsn] [output-option]

dsn being username:password@hostname:port/database_name

output-option verbose outputs all output of INSERTs UPDATEs etc, json provides JSON encoded output for a return value to another script otherwise a minimal table update output is the resulting output

Example: mysql-sync root:password@localhost:port/source_db root:password@localhost:port/dest_db json

If the remote mysql port is not open, tunnel it via SSH i.e ssh -L 3308:localhost:3306 -o TCPKeepAlive=no -o ServerAliveInterval=15 user@host then mysql-sync root:password@localhost:3308/voeb root:password@localhost:3306/v verbose

• lists all tables on the remote and local host
• compares the checksum of each mysql table
• syncs the tables where checksum is invalid
• verifies the sync was successful via another checksum

The databases must have the same schema. Therefore, the script will stop if

• the number of tables is not similar
• the structure of a table is not similar i.e describe my_table