Create Table and Compression

Table compression saves disk space and reduces memory use in the buffer cache. Table compression can also speed up query execution during reads.

When Data Miner creates a table, Data Miner determines that internal sampling table does not have nested columns(DM_NESTED_*.): it then uses compression to create the table. Data Miner creates tables in the Create Table node and for creating split data sets for testing in Classification and Regression model build.For the Create Table Node, Data Miner additionally checks that no primary key is defined and no indexes are defined.