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SAP HANA Developer Guide - Get a Free Blog

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Parameter Data<br />

Type<br />

Default<br />

(TEXT)<br />

Default<br />

(SHORTTEXT)<br />

Default (Manually<br />

Created)<br />

Description<br />

parameter is automatically set<br />

to OFF.<br />

Text analysis can extract<br />

entities such as persons,<br />

products, or places, from<br />

documents and thus enrich the<br />

set of structured information in<br />

<strong>SAP</strong> <strong>HANA</strong>. You can use these<br />

additional attributes, which are<br />

stored in a new table, when<br />

creating models (views) for<br />

analytics and search scenarios<br />

to enable improved analytics<br />

and search in <strong>SAP</strong> <strong>HANA</strong>.<br />

For more information, see Text<br />

Analysis [page 242].<br />

Memory Consumption of Full Text Index Parameters<br />

In <strong>SAP</strong> <strong>HANA</strong>, certain full text index parameters can have a significant impact on memory consumption based on<br />

how they are defined.<br />

The following full text index parameters can have a significant impact on memory consumption:<br />

Parameter Memory Impact Details<br />

PHRASE_INDEX_RATIO If the value is greater than 0.0, then there is additional<br />

memory overhead. The maximum memory<br />

consumption is the memory consumption of the full<br />

text index multiplied by the parameter value.<br />

FUZZY_SEARCH_INDEX To increase response times for fuzzy search, when<br />

enabled, this parameter creates additional in-memory<br />

structures. For text-type columns, fuzzy search<br />

indexes require approx. 10% of the memory size of the<br />

column.<br />

TEXT ANALYSIS If set to ON, an additional table is created for storing<br />

<strong>SAP</strong> <strong>HANA</strong> <strong>Developer</strong> <strong>Guide</strong><br />

Enabling Search<br />

structured data extracted from the source text for text<br />

analysis. The amount of extracted data depends on the<br />

data in the source column, the text analysis rules, and<br />

the structure of the results. In certain cases, the<br />

memory consumption of the extracted data could<br />

exceed the memory consumption of the source data.<br />

P U B L I C<br />

© 2012 <strong>SAP</strong> AG. All rights reserved. 251

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