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With this setting, transactions are never automatically started.All transactions must be explicitly started by executing the statement may be used to explicitly start a transaction if required, typically to allow several updates to be grouped together within a single transaction for consistency, as already described.To use any other database back-end, run from the source distribution and install the appropriate driver for the required back end. For example: because it is an instance of a Uniform Resource Identifier.The DAL allows multiple connections with the same database or with different databases, even databases of different types.
However, the UNDO_RETENTION parameter is only a suggestion.Please read the list of caveats at Perform a bulk save of the given list of objects.The bulk save feature allows mapped objects to be used as the source of simple INSERT and UPDATE operations which can be more easily grouped together into higher performing “executemany” operations; the extraction of data from the objects is also performed using a lower-latency process that ignores whether or not attributes have actually been modified in the case of UPDATEs, and also ignores SQL expressions.The objects as given are not added to the session and no additional state is established on them, unless the Warning The bulk save feature allows for a lower-latency INSERT/UPDATE of rows at the expense of most other unit-of-work features.Features such as object management, relationship handling, and SQL clause support are silently omitted in favor of raw INSERT/UPDATES of records.
An automatically started transaction is concluded by executing a statement is most commonly used in exception routines for handling error situations that are detected by the application during transaction build-up.