Abstract: Methods and systems to build and utilize a search infrastructure are described. The system generates index information components in real-time based on a database that is time-stamped. The system updates index information at a plurality of query node servers based on the index information components. A query engine receives a search query from a client machine and identifies search results based on the query and the index information. The system communicates the search results, over the network, to the client machine.

Abstract: A method and system to configure a profile to rank search results are provided. A profile that includes behavior information organized as a plurality of components is generated. Additional behavior information is received from a user. At least one component of the plurality of components is updated using the additional behavior information received from the user. A search query is received and search results are generated based on the search query. Search results are ranked based on the updated profile.

Abstract: Systems and methods to identify synonyms are described. The system generates demand information based on a first plurality of queries. Further, the system identifies a second plurality of queries as a first cluster of queries from the first plurality of queries based on the demand information, and identifies a first synonym set based on an association map that comprises a first plurality of constraints identified from the second plurality of queries. Finally, the system stores the first synonym set in a synonym dictionary.

Abstract: Methods and system for item matching are described. In one embodiment, compatibility-based text for an item may be accessed. A compatibility identifier may be identified based on the compatibility-based text. The compatibility identifier may be associated with an item cluster. The compatibility identifier may be used to identify a plurality of matching items. A result may be provided based on identification of the plurality of matching items. Additional methods and systems are disclosed.

Abstract: Methods and system for item clustering are described. In one embodiment, compatibility data may be accessed for an item. The compatibility data may include a plurality of parent items with which the item is compatible. A particular parent item within the compatibility data may be identified. An item cluster for the item and an additional item may be created based on compatibility of the item and the additional item with the particular parent item within the compatibility data. A compatibility identifier may be associated with the item cluster. The compatibility identifier may be associated with the parent item. Additional methods and systems are disclosed.