Improve compression of columns with 32K to 64K distinct values.
Details
| Detail name | Value |
|---|---|
| Changelog Number | 26225 |
| Type | Improvement |
| Status | Resolved |
| Fix Versions | Exasol 2025.1.3, Exasol 2025.2.0 |
| Resolution Date | 2025-09-17 |
Background
Exasol uses different compression algorithms based on the data stored in columns.
Improvement
The compression of fixed size columns with limit number of distinct values is improved. Instead of a maximum of 32000 different values, now up to 64000 different values may be in the column to activate a special compression algorithm. This reduces the memory consumption of such columns.
Only new or recompressed data blocks are affected.
