Replication Server Presentation - Sybase

Performance Enhancements
Configurable Transaction Partitioning
Background
• Parallel DSI threads in RS attempt to apply transactions in
the queue to the replicate DB in parallel
• Each DSI thread opens a connection to the replicate DB
• Commit order is still maintained – only the “body” of the
transactions are applied in parallel
• Transactions can also be grouped together to apply “more”
in each unit of work – grouping rules decide which
transactions can be grouped
• Not all transaction “bodies” can be applied in parallel
• Some of them may deal with the same tables/rows
• Resulting in deadlocks and rollbacks, reducing
throughput
• Transaction grouping increases the chance of contention