Space Considerations - Teradata Database

Teradata Database Design

Teradata Database
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Space Considerations

Creating a secondary index causes the system to build a subtable to contain its index rows, thus adding another set of rows that requires updating each time a table row is inserted, deleted, or updated.

Secondary index subtables are also duplicated whenever a table is defined with FALLBACK, so the maintenance overhead is effectively doubled.

When compression at the data block level is enabled for their primary table, secondary index subtables are not compressed See “Data Block” on page 196 and “Compression Types Supported by Teradata Database” on page 635 for more information about data block compression.