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    FAST IN-MEMORY TECHNIQUE TO BUILD A REVERSE CSR GRAPH INDEX IN AN RDBMS
    4.
    发明申请
    FAST IN-MEMORY TECHNIQUE TO BUILD A REVERSE CSR GRAPH INDEX IN AN RDBMS 有权

    公开(公告)号：US20210286790A1

    公开(公告)日：2021-09-16

    申请号：US16816686

    申请日：2020-03-12

    Applicant: Oracle International Corporation

    Inventor： Jean-Pierre Lozi ,  Marco Arnaboldi ,  Laurent Phillipe Daynes ,  Vlad Ioan Haprian ,  Hugo Kapp

    IPC: G06F16/22 ,  G06F16/21

    Abstract: In an embodiment, a computer obtains a mapping of a relational schema of a database to a graph data model. The relational schema identifies vertex table(s) that correspond to vertex type(s) in the graph data model and edge table(s) that correspond to edge type(s) in the graph data model. Each edge type is associated with a source vertex type and a target vertex type. Based on that mapping, a forward compressed sparse row (CSR) representation is populated for forward traversal of edges of a same edge type. Each edge originates at a source vertex and terminates at a target vertex. Based on the forward CSR representation, a reverse CSR representation of the edge type is populated for reverse traversal of the edges of the edge type. Acceleration occurs in two ways. Values calculated for the forward CSR are reused for the reverse CSR. Elastic and inelastic scaling may occur.

    PARALLEL AND EFFICIENT TECHNIQUE FOR BUILDING AND MAINTAINING A MAIN MEMORY CSR BASED GRAPH INDEX IN A RDBMS
    5.
    发明申请
    PARALLEL AND EFFICIENT TECHNIQUE FOR BUILDING AND MAINTAINING A MAIN MEMORY CSR BASED GRAPH INDEX IN A RDBMS 有权

    公开(公告)号：US20210224235A1

    公开(公告)日：2021-07-22

    申请号：US16747827

    申请日：2020-01-21

    Applicant: Oracle International Corporation

    Inventor： Marco Arnaboldi ,  Jean-Pierre Lozi ,  Laurent Phillipe Daynes ,  Vlad Ioan Haprian ,  Shasank Kisan Chavan ,  Hugo Kapp ,  Sungpack Hong

    IPC: G06F16/21 ,  G06F16/901 ,  G06F16/28 ,  G06F16/27

    Abstract: Herein are techniques that concurrently populate entries in a compressed sparse row (CSR) encoding, of a type of edge of a heterogenous graph. In an embodiment, a computer obtains a mapping of a relational schema to a graph data model. The relational schema defines vertex tables that correspond to vertex types in the graph data model, and edge tables that correspond to edge types in the graph data model. Each edge type is associated with a source vertex type and a target vertex type. For each vertex type, a sequence of persistent identifiers of vertices is obtained. Based on the mapping and for a CSR representation of each edge type, a source array is populated that, for a same vertex ordering as the sequence of persistent identifiers for the source vertex type, is based on counts of edges of the edge type that originate from vertices of the source vertex type. For the CSR, the computer populates, in parallel and based on said mapping, a destination array that contains canonical offsets as sequence positions within the sequence of persistent identifiers of the vertices.

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