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Merge Stewart - including adapting and expanding the "differences from mysql" page from the wiki.

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Calling KILL will terminate a either a running query, or disconnect a

connection, i.e. a session, from the database.

The way this works is that your connection sets a 'kill' flag in the session

you want to kill. At various points in query execution, a session will

check if the kill flag has been set, and if so, will quickly exit. So while

the KILL command will not strictly immediately kill the session, it should

appear to be fairly instantaneous.

Some engines such as Innobase will also check for the kill flag

during a lock wait, allowing you to kill a session waiting for a row lock.