rsim/oracle-enhanced — pull request #226 by yahonda (2012-09-25 15:38:44+00:00)
Title: Support for specifying transaction isolation level with Oracle

Supported isolation levels with Oracle database are:
* `:read_committed`
* `:serializable`

These isolation levels are not supported with Oracle database:
* `:read_uncommitted`
* `:repeatable_read`

See also https://github.com/rails/rails/commit/392eeecc11a291e406db927a18b75f41b2658253