3.3

Storage

Data storage options can be tuned for each column similar to how indexing is defined.

Column Store

Beside of storing the row data as-is (and indexing each value by default), each value term is stored into a Column Store by default. The usage of a Column Store is greatly improving global aggregations and groupings and enables ordering possiblity as the data for one column is packed at one place. Using the Column Store limits the values of string columns to a maximal length of 32766 bytes.

Turning off the Column Store in conjunction of turning off indexing will remove the length limitation.

Example:

cr> CREATE TABLE t1 (
...   id INTEGER,
...   url STRING INDEX OFF STORAGE WITH (columnstore = false)
... );
CREATE OK, 1 row affected  (... sec)

Doing so will enable support for inserting strings longer than 32766 bytes into the url column, but the performance for global aggregations, groupings and sorting using this url column will decrease.

Supported data types

Controling if values are stored into a Column Store is only supported on follwing data types:

For all other Primitive Types, it is enabled by default and cannot be disabled. Compound Types and Geographic Types do not support storing values into a Column Store at all.