There was war story told involving software that’s not generally available. However, one tidbit that may be of general interest is a reminder that you don’t necessarily get a perfect copy of your mysql database when restoring from a dump of that database. Mysqldump by default writes the data of each table preceded by a DROP TABLE IF EXISTS and a CREATE TABLE statement. This covers you in most situations, but misses when new tables have been created since the dump was made — those new tables are not deleted. They may not cause problems, but some systems are sensitive to the existence of those tables, such as rails and the schema_info and schema_migrations tables.
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