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This is depicted as capability 3 (the number inside the circle) in Figure 3-4 on page 33. Figure 3-4: Capture Function If we use a relational DBMS for the operational systems, we can take advantage of capabilities such as triggers, or the DBMS change capture mechanism, to provide the delivery function with the data changes that occur. Database triggers work by taking an action whenever specifically defined data changes occur. However, triggers are executed, or fired, during the unit of work for the transaction that originally changed the data.
If these rules are met, then the rows from the different join tables are guaranteed to be placed on the same partition. Note Do not confuse replicated tables with replication or data propagation. Replicated tables are database objects. Replicated tables can also be used to help maintain collocation between tables. You should consider replicated tables for situations where a table cannot be partitioned on the same columns as the other tables. A replicated table is copied in its entirety to all database partitions in the node group.
Concurrency can be determined by the lock granularity and isolation level. DB2 UDB supports the following isolation levels to give maximum flexibility when deciding the trade-offs between concurrency and integrity: • Repeatable Read: All rows referenced within a unit of work are locked. • Read Stability: All rows retrieved within a unit of work are locked. • Cursor Stability: This locks the row while the cursor is positioned on that row. The lock is held until the next row is retrieved. Or if the row is changed, the lock is held until the change is committed.