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Difference between revisions of "Stardust/Knowledge Base/Performance Tuning/Write Behind"
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| − | The Write Behind feature has been introduced for mainly STP-driven solutions characterized by high volume and throughput with the need for low latency. The basic idea around Write Behind is to write process run information as a batch asynchronously into the database, instead of doing it right away. Writing process run information synchronously creates a lot of contention on sequence retrieval and redo logs, which can’t be much reduced / optimized. Write Behind, however, dissolves such contention, since the number of database operations are optimized and reduced to a minimum. That way much more process instances can be completed within a given timeframe. Depending on complexitiy of the processes, multiple hundreds of process instances can be processed within a second. | + | The Write Behind feature has been introduced for mainly STP-driven solutions characterized by high volume and throughput with the need for low latency. The basic idea around Write Behind is to write process run information as a batch asynchronously into the database, instead of doing it right away. Writing process run information synchronously creates a lot of contention on sequence retrieval and redo logs, which can’t be much reduced / optimized. Write Behind, however, dissolves such contention, since the number of database operations are optimized and reduced to a minimum. That way much more process instances can be completed within a given timeframe. Depending on complexitiy of the processes, multiple hundreds of process instances can be processed within a second. |
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| + | == Prerequisites == | ||
Revision as of 07:02, 11 November 2011
Introduction
The Write Behind feature has been introduced for mainly STP-driven solutions characterized by high volume and throughput with the need for low latency. The basic idea around Write Behind is to write process run information as a batch asynchronously into the database, instead of doing it right away. Writing process run information synchronously creates a lot of contention on sequence retrieval and redo logs, which can’t be much reduced / optimized. Write Behind, however, dissolves such contention, since the number of database operations are optimized and reduced to a minimum. That way much more process instances can be completed within a given timeframe. Depending on complexitiy of the processes, multiple hundreds of process instances can be processed within a second.