Albe Laurenz schrieb am 16.03.2016 um 13:20: >> The error as reported in the Postgres log file is this: >> >> 2016-03-12 13:51:29.305 CET [23912]: [1-1] user=arthur,db=prod,app=[unknown] ERROR: deadlock detected >> 2016-03-12 13:51:29.305 CET [23912]: [2-1] user=arthur,db=prod,app=[unknown] DETAIL: Process 23912 >> waits for ShareLock on transaction; blocked by process 24342. >> Process 24342 waits for ShareLock on transaction 39632974; blocked by process 23912. >> Process 23912: UPDATE alpha SET some_flag = $1 WHERE (id = $2) >> Process 24342: INSERT INTO bravo (..., alpha_id) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, >> $10) >> >> Can the foreign key between bravo and alpha play a role here? With some simple test setups I could not >> get the insert to wait even if it was referencing the row that the other process has updated. >> >> This happened on 9.3.10 running on Debian > > The probable culprit is a foreign key between these tables. > > What foreign keys are defined? The FK in question is: alter table bravo foreign key (alpha_id) references alpha (id); But by simply creating two tables (with a foreign key) and doing an update in one transaction and the insert in another, I do not get any locks or waiting transactions. (And to be honest: I would have been pretty disappointed if I had) Thomas -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
