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I had to recover a database with a some months old full backup. I have however in my possession a most recent but unfortunately incomplete SQL dump for this same database done with mysqldump.

Is there any tool out there that will allow me to compare my SQL dump with the live database and import any new data?

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I guess you should import both dump's to MySQL Server, and then use

REPLACE INTO old SELECT * FROM new
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import your dump with INSERT IGNORE OPTION (skip duplicates)

on your dump file (assuming you're using linux OS)

cat /path/dir/to/dumpfile.sql | sed s/"^INSERT"/"INSERT IGNORE"/g > /path/dir/to/newdump.sql

then issue import

mysql -u username -p databasename < /path/dir/to/newdump.sql

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