c-treeRTG V3 Update Guide

Key Compression with c-treeRTG

The <keycompress> option defaults to index compression.

The following <keycompress> suboptions specify which compression type to use:

• <rle> - Indicates to compress the whole key using a simple RLE algorithm.
• <padding> - Indicates to compress the padding characters of the key.

The new index compression does not support the <leading> compression type. The old index compression can be used by disabling <keycompress vlennod> (enabled by default), which allows the <leading> and <padding> to be specified. The new <rle> option cannot be specified when the <keycompress vlennod> attribute is disabled. The <rle> and <padding> sub-options are mutually exclusive unlike the old index compression where it was possible to combine <leading> and <padding>.

The following examples turn on the new index compression:

<keycompress/>

<keycompress>1</keycompress>

<keycompress><rle/></keycompress>

<keycompression><padding>1</padding></keycompression>

The following examples enabled the old index compression:

<keycompress vlennod="no"/>

<keycompress vlennod="0">1</keycompress>

<keycompress vlennod="false"><leading>1</leading></keycompress>

<keycompression vlennod="n"><leading/><padding/></keycompression>