Compression techniques and features
Not all
Data Packer
compression methods and features are available for use with HALDB and DEDB database formats.
The following table summarizes the availability of Data Packer compression methods and features by database type.
Compression method/feature | IMS full-function database | HALDB database | Fast Path DEDB |
|---|---|---|---|
Static Huffman compression | Available | Available | Available |
Custom Huffman compression | Available | Not supported | Not supported |
Shared Table compression | Available | Available | Available |
Hybrid | Available | Available | Available |
Basic Character compression | Available | Available | Available |
Extended Character compression | Available | Available | Available |
Hardware compression | Available | Available | Available |
Custom Hardware Dictionary compression | Available | Available | Available |
Trial Utility | Available | Available | Available |
Minimum Segment Length | Available | Available | Available |
Fixed Pad Size | Available | Available | Available |
Free Space Segment Size | Available | Available | Not beneficial |
DPIDASD Utility | Available | Available | Not supported |
ISPF interface | Available | Available | Available |
Reorg DBD Utility | Available | Available | Available |
Segment Dump utility | Available | Available | Not supported |
DPICDS Security Exit | Available | Available | Available |
DPICDS Reblocking Utility | Available | Available | Available |
Callable Interface | Available | Available | Available |
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