Sap Se

Sap Ag

Holger Schwedes

Wolfgang Stephan

Thomas Peh

Andrew Ross

Frank Renkes

Christian Bensberg

Martin Heidel

Frederik Transier

Axel Herbst

Oliver M Steinau

Heiko Gerwens

Stefan Elfner

Christian Kraus

Tobias Zahn

Wolfgang Stephen

A system, a method, and a computer program product for providing transparent access to multi-temperature data are disclosed. A query for accessing data is received. The query includes at least one selection parameter for retrieval of data. The data is stored in a plurality of partitions of a database system. Each partition has a maximum data value per column, a minimum data value per column, and a predetermined date associated with the data contained in the partition. A determination is made whether at least one selection parameter is greater than the minimum data value per column and less than the maximum data value per column. The queried data is retrieved from the partition using the predetermined date associated with the data contained in the partition.

Transparent access to multi-temperature data

A join operation between split data tables includes providing reduction data from first partitions to each partition among second partitions. The reduction data serves to identify actual values in one of the second partitions that also occur in one of the first partitions. Global IDs are assigned. Translation lists including the global IDs are sent to the first partitions. Each first partition and each second partition create globalized lists which can then be combined to generate respective first and second compiled lists. The join operation can then be conducted on the first and second compiled lists.

Equi-joins between split tables

A join operation between split data tables includes providing value IDs. For each of the value IDs, a unique global ID may be associated with the value ID when the actual value represented by the value ID occurs among actual values comprising the second attribute of the second partition. For each identified unique global ID, the identified unique global ID may be paired with a document ID of a data record contained in a second partition stored at the second server in which the actual value in the data record is represented by the value ID associated with the identified unique global ID.

A request for at least a portion of a business object is received by a database from a client in a first half of a roundtrip between the client and the database. Each of the tables includes a primary key column and a plurality of records. The primary key column provides, for each record in the table, a primary key for one of a plurality of business objects. Thereafter, the database identifies records within a set of tables among a larger number of tables in the database by matching a primary key associated with the business object with the primary key in the primary key column. Once this identification has been made, the database obtains all values responsive to the request from the identified record and transmits, in a second half of the roundtrip between the client and the database, the obtained values for the business object to the client.

Enhanced business object retrieval

Methods and apparatus, including computer program products, for selection of rows and values from indexes with updates. In general, rows of an index may be associated with validity flags that indicate whether a row has been updated with an update inserted in a delta index; one scheme for value identifiers may be used for an index and another scheme for one or more delta indexes where all of the indexes are, to at least some extent, compressed according to dictionary-based compression; and multiple delta indexes may be used in alternation such that one delta index may accept updates while another is being updated. The delta indexes may also have validity flags and all updates, such as modifications of values, deletion of records, and inserting of new records may be handled as updates accepted by one or more delta indexes.

Selection of rows and values from indexes with updates

A search query for a collection of electronic documents is parsed to identify one or more terms and such identified terms are associated with one or more languages (i.e., spoken languages such as English, German, Spanish, etc.). A terms inverted index and a language inverted index are accessed to identify documents responsive to the query. Related apparatus, systems, techniques and articles are also described.

Inverted indexes with multiple language support

Systems and methods are provided for efficient calculation of sets of distinct results in an information retrieval service. A query is received having at least one requested attribute and one or more conditions. For each row identifier in a database table that matches the one or more conditions, a tuple of value identifiers having an entry for each requested attribute is calculated. A unique number is generated and assigned to the tuple for each distinct combination of the value identifiers. Duplicate entries in the tuple listing are identified and removed, so that a result set provides only distinct results.

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Kraichtal, Germany

Holger Schwedes