Nick,
http://dev.mysql.com/doc/mysql/en/innodb-monitor.html
you can use innodb_lock_monitor to find out who is locking the row.
Best regards,
Heikki Tuuri
Innobase Oy
Foreign keys, transactions, and row level locking for MySQL
InnoDB Hot Backup - a hot backup tool for InnoDB which also backs up MyISAM
tables
http://www.innodb.com/order.php
Order MySQL Network from http://www.mysql.com/network/
We have something I can't figure out happening on one of our servers. It's
running 4.0.23
on OSX.
One of the InnoDB tables is locked even though we can't see any process that
is even
active that
could have locked it. SHOW OPEN TABLES doesn't show it as in use or locked.
We've tried
all sorts
of things to get access to it, short of bouncing the server, but it keeps
saying it's
locked. When
we try to acquire a lock on that table, the process list says "SYSTEM LOCK"
and we get the
good old
"Lock wait timeout exceeded; Try restarting transaction" message after 30
seconds.
I've tried this with AUTOCOMMIT on and off, with LOCK TABLES and with START
TRANSACTION...
nothing
seems to help. Strangely, FLUSH TABLES WITH READ LOCK seems to succeed, but
after
unlocking them,
we still can't get a lock for this table.
I've never been able to see how we can find out which connection has the
lock on a given
table. If
that's possible, I'd like to know that, too, so I could at least know how it
got locked in
the first
place.
Could a misbehaving client do this in a way that would cause the lock to
persist even
after the
client has disconnected? If so, ugh.
Any help appreciated.
Nick
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