I run alter today on table with 380,000 records. 'Alter' was adding
column to the table. It took 10 minutes and server load went up to
15.

"alter table info add column interactive_email enum('on','off') NOT NULL default 'on';"

Here comes my questions:

#1 If I kill the process after it was running for 5 minutes. Would it
update some records and some records not?

#2 How dangerous is to stop alter?

#3 What is a good way to stop alter or update without damaging database?

Thanks

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