Create Table Node and Compression

Table compression does the following:

• Saves disk space

• Reduces memory use in the buffer cache

• Speeds up the running of queries during reads

When Oracle Data Miner creates a table, if Oracle Data Miner determines that the data does not have nested columns DM_NESTED_*, then it uses compression to create the table. Oracle Data Miner creates tables in the Create Table node, and creates split data sets for testing in the Classification and Regression model build.

For the Create Table node, Oracle Data Miner also verifies that a primary key is not defined and no indexes are defined.