Lost connection to mysql during query, mysql workbench -

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i have same problem this when want index large table on 1 of non-unique columns integer, , tried solutions proposed in post has @ least 1 vote up. still couldn't fix it. other ideas?

i have enough memory:

max_allowed_packet: 2g, innodb_buffer_pool_size: 9g

all time out settings mentioned in this post , here set higher numbers default.

while not necessary answer loosing connection in mysql workbench workaround. when comes long running queries in mysql workbench, if 1 changes mysql workbench parameters, there seems connection time_out issue still occuring. so, run query mysql command line , see if works. if works when run mysql command line , not workbench, know mysql workbench issue , not other issue.


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