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    Method for fast and consistent invocation of concurrently modifiable user-defined functions
    3.
    发明授权
    Method for fast and consistent invocation of concurrently modifiable user-defined functions 有权

    公开(公告)号：US10990594B2

    公开(公告)日：2021-04-27

    申请号：US15971664

    申请日：2018-05-04

    Applicant: Oracle International Corporation

    Inventor： Anantha Kiran Kandukuri ,  Laurent Daynes ,  Hassan Chafi

    IPC: G06F8/70 ,  G06F16/23 ,  G06F16/2453 ,  G06F16/2455

    Abstract: Database techniques are provided that use state machines to manage polyglot subroutine bindings for database commands. In an embodiment, a computer receives a database command that contains call sites (CSs). Each CS is associated with a user defined logic (UDL). The computer associates an initial operational state with each of the CSs. During a first invocation of a particular CS, the CS becomes initialized and transitions to an optimized state that is configured for streamlined invocation of the UDL. The UDL is invoked to contribute data to a partial result for the database command. Eventually, command execution stalls and causes the CS to transition to an unready state, which entails releasing shared resources. Later execution resumes and during another invocation of the CS, resources are reacquired, the CS is made ready and transitioned back to the optimized state. The CS may again be repeatedly invoked while revisiting the optimized state.

    Runtime optimization of arithmetic expressions with decimal numbers
    4.
    发明授权
    Runtime optimization of arithmetic expressions with decimal numbers 有权

    公开(公告)号：US10592264B2

    公开(公告)日：2020-03-17

    申请号：US15981011

    申请日：2018-05-16

    Applicant: Oracle International Corporation

    Inventor： Alexey Karyakin ,  Laurent Daynes

    IPC: G06F9/455 ,  G06F7/491

    Abstract: A method may include generating, from an expression, an expression tree including an arithmetic operation and conversion operations each converting an operand of the arithmetic operation from an initial decimal format to an optimized decimal format. The initial decimal format may include a shape. The method may further include at runtime, evaluating the arithmetic operation with initial operands represented in the initial decimal format, and specializing one of the conversion operations according to the shape of the corresponding initial operand.

    RUNTIME OPTIMIZATION OF ARITHMETIC EXPRESSIONS WITH DECIMAL NUMBERS
    5.
    发明申请
    RUNTIME OPTIMIZATION OF ARITHMETIC EXPRESSIONS WITH DECIMAL NUMBERS 审中-公开

    公开(公告)号：US20190354391A1

    公开(公告)日：2019-11-21

    申请号：US15981011

    申请日：2018-05-16

    Applicant: Oracle International Corporation

    Inventor： Alexey Karyakin ,  Laurent Daynes

    IPC: G06F9/455 ,  G06F7/491

    Abstract: A method may include generating, from an expression, an expression tree including an arithmetic operation and conversion operations each converting an operand of the arithmetic operation from an initial decimal format to an optimized decimal format. The initial decimal format may include a shape. The method may further include at runtime, evaluating the arithmetic operation with initial operands represented in the initial decimal format, and specializing one of the conversion operations according to the shape of the corresponding initial operand.

    FIRST FUTAMURA PROJECTION IN THE CONTEXT OF SQL EXPRESSION EVALUATION
    9.
    发明申请
    FIRST FUTAMURA PROJECTION IN THE CONTEXT OF SQL EXPRESSION EVALUATION 有权

    公开(公告)号：US20220391392A1

    公开(公告)日：2022-12-08

    申请号：US17889712

    申请日：2022-08-17

    Applicant: Oracle International Corporation

    Inventor： Pit Fender ,  Alexander Ulrich ,  Laurent Daynes ,  Matthias Brantner ,  Bastian Hossbach ,  Benjamin Schlegel ,  Hassan Chafi

    IPC: G06F16/2453 ,  G06F16/2455 ,  G06F8/41

    Abstract: The present invention relates to execution optimization of database queries. Herein are techniques for optimal execution based on query interpretation by translation to a domain specific language (DSL), with optimizations such as partial evaluation, abstract syntax tree (AST) rewriting, just in time (JIT) compilation, dynamic profiling, speculative logic, and Futamura projection. In an embodiment, a database management system (DBMS) that is hosted on a computer generates a query tree that represents a database query that contains an expression that is represented by a subtree of the query tree. The DBMS generates a sequence of DSL instructions that represents the subtree. The sequence of DSL instructions is executed to evaluate the expression during execution of the database query. In an embodiment, an AST is generated from the sequence of DSL instructions. In an embodiment, the DSL AST is optimally rewritten based on a runtime feedback loop that includes dynamic profiling information.

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