Compression

Locating JADE database files or journals on compressed drives or directories is not supported.

The issue is that when compression is used, the actual file data is handled by the operating system in large chunks. When the database engine updates a record or block, therefore, the system is really working on a large chunk of data and rewriting it. The data rewrite breaks the WAL protocol because data written to disk will be rewritten, thereby breaking write ordering rules. The rewrite can lead to caching and other activities that are not appropriate for database ACID properties.

All database journal and data files that can be updated must remain in an uncompressed state.