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How can I be sure that a query was not executed?

For example, I try to execute

update `table` set `a`='b' 

and got the error 2006 server has gone away

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  • If you're worried about this, use transactions. – ceejayoz Mar 6 '19 at 23:03
  • SELECT COUNT(DISTINCT a), COUNT(*) FROM table; to determine current DISTINCT number of values in your a column and total row count – Wilson Hauck Mar 10 '19 at 19:19
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Don't run the SQL statement :-)

If you want the mysql client to stop you running it, there is a --safe-updates aka --i-am-a-dummy option.

If you want the server to rollback, use innodb tables that provide transactional support.

For the error see gone away.

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