----- On Apr 1, 2016, at 3:12 PM, Bernd Lentes bernd.len...@helmholtz-muenchen.de wrote:
Btw: i read about isolation levels. REPEATABLE READ is the default for InnoDB. http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_repeatable_read says: "...so that all queries within a transaction see data from the same snapshot, that is, the data as it was at the time the transaction started.". http://dev.mysql.com/doc/refman/5.5/en/glossary.html#glos_consistent_read says: "With the repeatable read isolation level, the snapshot is based on the time when the first read operation is performed". What is true ? when the transaction started or when the first read is performed ? Bernd Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Dr. Alfons Enhsen, Renate Schlusen (komm.) Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
