Abstract: A method of exchanging data between a database and distribution nodes in a multimode replication environment includes defining data stored in a database to be exchanged for replication and using database data having at least two subsets of data. The subsets are distinct and have no overlap. At least one subset is distributed to only one node. Other subsets may be distributed to other nodes. The node receiving the distinct, non-shared subset of database data is permitted to change the data based on a creation, modification, or deletion of elements in the data subset. The changed subset data is returned to the data base and the database stores the changed data without performing conflict checks or distribution list calculations as performed in prior art systems.

Abstract: A method of removing metadata from a database in a multimode replication system includes establishing a metadata retention period for nodes in the system as well as associating changes with nodes on the system. The system responds to an expiration of the retention period for any one node by analyzing the associated changes and nodes and determining if the change affects data shared with other nodes. If the data is shared with other nodes then the expired retention period node metadata is removed from the system. If the expired metadata retention period node does not share the changes with other nodes, the metadata is not removed. This allows any unique changes to still be entered into the database without adversely affecting other nodes.

Abstract: A method of exchanging data between a database and distribution nodes in a multimode replication environment includes defining data stored in a database to be exchanged for replication and using database data having at least two subsets of data. The subsets are distinct and have no overlap. At least one subset is distributed to only one node. Other subsets may be distributed to other nodes. The node receiving the distinct, non-shared subset of database data is permitted to change the data based on a creation, modification, or deletion of elements in the data subset. The changed subset data is returned to the data base and the database stores the changed data without performing conflict checks or distribution list calculations as performed in prior art systems.

Abstract: A reel pipelaying vessel of the type having a main pipeline reel (118) mounted for rotation about a horizontal axis, a variable angle pipeline launching ramp (128) having pipeline straightening and tensioning means mounted thereon and having: an improved pipeline launching ramp arrangement including rack and pinion elevator means (140, 142, 144); an improved level winding mechanism for translating the pipeline straightening and tensioning means as the pipe is spooled onto or unspooled from the reel; sea fastening means for restraining axial movement of the reel while the vessel is in transit, thereby increasing the maximum pipeline load for reel bearings (114, 116) of a given load capacity; sponsons (108, 110) for providing additional flotation and strengthening the hull; an improved arrangement of auxiliary reels (120); a cantilever structure (200) for guiding auxiliary lines, providing access to the main reel and protecting the bridge (218) of the vessel; improved pipeline abandonment and recovery arrangeme