Is there an index on that table? Inserts cause index "updates". Many years ago I investigated what might have been the exact same issue you describe here, and I recall that as soon as index maintenance decides that a block needed to be split, you could run into the 'cannot serialize' error. On Fri, Jun 21, 2013 at 12:21 PM, Martin Berger <martin.a.berger@xxxxxxxxx>wrote: > Hi List, > I found a very interesting observation I can not explain (based on this > page: > http://www.devx.com/dbzone/Article/41591/0/page/2 ) > > given a table with an index (not even unique) > > with 2 sessions set isolation_level=serializable and both do a simple > insert often enough, an > ORA-08177: can't serialize access for this transaction > is raised. > The solution of the page mentioned above is to set the table to > rowdependencies > . > > But I would like to understand why the ORA-08177 is raised at all for pure > inserts? They should be totally independent? > > Any insights what the instance is doing here are very welcome. > > Martin > > > -- > //www.freelists.org/webpage/oracle-l > > > -- Toon Koppelaars RuleGen BV Toon.Koppelaars@xxxxxxxxxxx www.RuleGen.com TheHelsinkiDeclaration.blogspot.com (co)Author: "Applied Mathematics for Database Professionals" www.rulegen.com/am4dp-backcover-text -- //www.freelists.org/webpage/oracle-l