[EP-tech] select and mysql 5.6.27
paolo.tealdi at polito.it
Mon Mar 7 08:25:04 GMT 2016
After 5 year of normal use with mysql 5.1.XX, after the upgrade to mysql 5.6.27,
we noticed that our eprints sometimes (1 time every two day more or less)
suddendly blocks itself.
Analyzing the problem we noticed that one of the mysql connections from eprints
server (we are using a centralized version of mysql) is hanging in "statistics"
status on a very big select (in attach).
All the other processes are waiting for table lock.
After the Kill of that processs, all the other processes flushed immediately
and the server returns to life.
Have you ever noticed this BIG issue ? Any idea ?
In attach one of the sql commands.
Our optimizer_search_depth is set to 0.
P.S. One of the problems probably is due to the eprint__rindex size ... 37M of
Ing. Paolo Tealdi Area IT - Politecnico Torino
Telefono/Phone : +39-011-0906714 , FAX : +39-011-0906625
Indirizzo/Address : C.so Duca degli Abruzzi, 24 - 10129 Torino - ITALY
Skype : tealdi.paolo
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