Ajilius 3.2.7 includes a new type of transform, labelled Persist Static.
The intent of this transform is to persist a table that will not be automatically reloaded.
Ajilius has a dependency-based scheduler. When we process a table, we recursively check and process its dependencies if required. Until now, that meant that ALL tables could potentially be reloaded.
We found this wasteful in cases where the table was relatively static. A business calendar, for example, might be updated once per year by the Finance department. A translation table aligning common data from two systems could be updated only when new products are added. In both examples, under the old process, these table would be reloaded every time a batch that referenced them was run.
Now, however, tables can with the type Persist Static will trim the dependency tree when included in a batch. The latest version of the table will be used, and its dependencies ignored.
A Persist Static table can still be reloaded from the command line. Assume that we have the following chain of tables, and that stage_source is Persist Static.
source.csv -> load_source -> stage_source
Any job that references stage_source as a dependency will use the latest contents of the table.
To reload this table, the following command might be used:
java -jar ajilius.jar -w MyWarehouse -t stage_source
That command will cause Ajilius to start processing with stage_source. It will be found to have a dependency of load_source. A load job will then be triggered to import data from source.csv. On completion of this job, the staging of data from load_source to stage_source will be performed. The table is then completely updated, and the job will terminate.
Ajilius. More effective loads and transforms.