=?UTF-8?Q?Grzegorz_Ja=C5=9Bkiewicz?= <gryzman@xxxxxxxxx> writes: > find in docs part that talks about transaction isolation levels, and > translate it to your problem. Yes, please read the fine manual: http://www.postgresql.org/docs/8.4/static/mvcc.html What I think will happen in your example is that all concurrent executions will locate the same row-to-be-updated. The first one to get to the row "wins" and updates the row. All the rest will fail, either updating no rows (if not serializable) or throwing an error (if serializable). regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
