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Saturday, January 13, 2007

Following up on what I wrote on Marco's blog, StreamCruncher now supports the Solid BoostEngine, which is a dual-engine Database. Dual-engine means that it supports both In-memory Tables and Disk-based Tables. All the Streams (Input and Output) created via StreamCruncher are created on the Memory Engine and the Queries can combine data from both Disk-based and Memory Tables.

The ReStockAlertTest in the examples, is a perfect example of this; where it combines the "stock_level" Disk-based table (default in Solid) and the "test_str" Stream defined on the In-memory "test" Table. StreamCruncher creates its artifacts using the "STORE MEMORY" clause.

Something similar is done for MySQL Databases, where SC creates artifacts using the "engine = MEMORY" clause (MySQL is a multi-engine DB).

For both Solid and MySQL, SC transparently adds this special clause to the Input and Output Table/Stream definitions.