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Home » Technical Support » DBISAM Technical Support » Product Manuals » DBISAM Version 4 Manual for RAD Studio XE (Delphi) » Advanced Topics » Index Compression |
Type | Description |
No Compression | In most cases it is not very useful to specify no compression at all since almost every type of index can benefit from some type of compression. The exception to this would be primary or unique secondary indexes that are comprised of only one SmallInt, Word, or very short (< 4 characters) String type of field. |
Duplicate-Byte Compression | Duplicate-byte compression works by comparing a given index key to its prior index key on the same index page and removing any duplicate bytes (working from the beginning of the index key to the end). |
Trailing-Byte Compression | Trailing-byte compression works by removing any trailing blank or null bytes from a given index key (working from the end of the index key to the beginning). |
Full Compression | Full compression works by combining both duplicate-byte compression with trailing-byte compression at the same time. |
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