first import

sites/all/modules/search_api_db/README.txt

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+Database search
+---------------
+
+This module provides a database based implementation of the Search API. The
+database and target to use for storing and accessing the indexes can be selected
+when creating a new server.
+
+All Search API datatypes are supported by using appropriate SQL datatypes for
+their respective columns (with "String"/"URI", and "Integer"/"Duration" being
+equivalent).
+
+The "direct" parse mode for queries will result in a simple splitting of the
+query string into keys. Additionally, search keys containing whitespace will be
+split, as searching for phrases is currently not supported.
+
+Due to SQL limitations, fulltext searches are always case-insensitive.
+
+Supported optional features
+---------------------------
+
+Regarding third-party features, this module supports the "search_api_facets"
+feature, introduced by the module of the same name. This lets you create
+facetted searches for any index lying on a database server.
+
+If you feel some service option is missing, or have other ideas for improving
+this implementation, please file a feature request in the project's issue queue,
+at [http://drupal.org/project/issues/search_api], using the "Database search"
+component.
+
+Known problems
+--------------
+
+Currently, Drupal doesn't support setting the table collation when creating
+tables. This might cause problems when you are using MySQL (maybe also other
+databases) and want to index data which can contain accented characters,
+umlauts, etc. (à, á, ä, …).
+To resolve the issue, please set "utf8_bin" as the collation for all tables
+starting with "search_api_db_".
+See [1] for details.
+
+[1] http://drupal.org/node/1144620