Table Compression:
What isn’t it?
• This is not a generic ‘zip’-style compression
– Not all tables will have good compression
– Compression algorithm guarantees that
compression will never increase size of table
– Most large DW tables seem to compress well
• Compression happens between column/row
values, not within column/row values
– Long character strings are not compressed unless
the exact same string appear multiple times
• LOB/BLOB columns are not compressed