You configure a Lotus Domino® database to use LZ1 compression and want to convert existing attachments to this algorithm to take advantage of its superior compression ratio. How can you upgrade the compression algorithm for existing attachments?

Solution

To convert existing attachments from Huffman to LZ1 compression, perform the following steps:

1. Enable the database property, "Use LZ1 compression for attachments", found in Database Properties --> Advanced (beanie) panel.
2. From the server console, run the following command (without quotes): "load compact -ZU"

for more Infos read the IBM Technote .

Approximate differences in message sizes:

Type of file	Actual file size	Message size with LZ1 compression	Message size with Huffman compression
MS Word Document	35 KB	8.9 KB	15.1 KB
PDF file	471 KB	370.5 KB	453.1 KB
Text file	4 KB	3.4 KB	5.7 KB

 (Table from IBM)