embedded - Updating MySQL database schema on update -


we have embedded linux device running mysql instance , have periodic updates system software, entire system image, replaced on reboot, written data stays intact. @ point may decide there 1 thing or incorrect in schema database , decide modification in order. given there update service runs on bootup after image replaced, before mysql instance starts up, how make updates schema in reliable , manageable way not require manual intervention , keeps schema in line version of software on new images. instance, devices might offline long time , not receive intermediate updates schema changes, download latest system image always. how can version schema , keep devices consistent latest version?


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