When creating algorithmic compression (ALC) columns, you should include the compression and decompression functions by which the column is going to be compressed and uncompressed respectively.
When you insert data into ALC columns, the data is compressed. When you select ALC columns the data is uncompressed.
|Uncompressed Data for the Following Data Types…||Requires the Following Bytes…|
|TIME WITH TIME ZONE||8|
|TIMESTAMP WITH TIME ZONE||12|