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Re: Getting "Lock wait timeout exceeded;" when using "for update"
Posted by: Rick James
Date: June 08, 2011 12:01AM

> Could the 2 indexes at the end be increasing the chances of locks when doing 'for update'?
I don't think so.

> the PK should be included in all indexes?
Correction...
The PK is implicitedly included in all indexes?
A lookup by a secondary key, for example `userid`, will use the PK to find the actual row.

Think of it as two BTree-organized tables, one with (userid, id), the other with the real row: (id, ...)

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