> > HI Ben, > How does column which is weak reference and also configured as > an Index? If it is mutable, and the corresponding UUID going away(deletion > of record) leaves column value as NULL right? And what would be the > behavior if the table is a Root table also? > I am listing down, my assumptions: > > 1. In table X, If the column is index and a weak reference to table y, > on table y row deletion, the index field would become NULL and since it is > an index, constraint violation would occur and to avoid, it is expected to > remove the row first in table X and table Y row deletion can happen in same > txn or consequent transactions. Correct? > 2. If the table X is also a root table, and one of its column is an > index > and weak reference to table Y, on row deletion in table Y, constraint > violation would occur, hence similar to above table X row cleanup is > expected to happen prior to table Y row deletion. > > If above 2 statements is true, index with weak reference is becoming > equivalent to strong reference. Am I correct? > > Thanks > Krishna Mohan
Would it make sense to allow NULL values for columns that are references and indexes. Something like what MySQL allows for unique keys. http://dev.mysql.com/doc/refman/5.0/en/create-index.html _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
