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Goetz Graefe

  1. Concurrency Control for Adaptive Indexing.

    Fri, 03/30/2012 - 15:01 — SomNambul
    Authors: Goetz Graefe, Harumi Kuno, Felix Halim, Stratos Idreos, Stefan Manegold
    Subjects: Databases
    Abstract

    Adaptive indexing initializes and optimizes indexes incrementally, as a side
    effect of query processing. The goal is to achieve the benefits of indexes
    while hiding or minimizing the costs of index creation. However,
    index-optimizing side effects seem to turn read-only queries into update
    transactions that might, for example, create lock contention. This paper
    studies concurrency control in the context of adaptive indexing.

  2. Definition, Detection, and Recovery of Single-Page Failures, a Fourth Class of Database Failures.

    Fri, 03/30/2012 - 15:01 — SomNambul
    Authors: Goetz Graefe, Harumi Kuno
    Subjects: Databases
    Abstract

    The three traditional failure classes are system, media, and transaction
    failures. Sometimes, however, modern storage exhibits failures that differ from
    all of those. In order to capture and describe such cases, single-page failures
    are introduced as a fourth failure class. This class encompasses all failures
    to read a data page correctly and with plausible contents despite all
    correction attempts in lower system levels. Efficient recovery seems to require
    a new data structure called the page recovery index.

  3. Visualizing the robustness of query execution.

    Thu, 09/10/2009 - 10:12 — SomNambul
    Authors: Goetz Graefe, Harumi Kuno, Janet Wiener
    Subjects: Databases
    Abstract

    In database query processing, actual run-time conditions (e.g., actual
    selectivities and actual available memory) very often differ from compile-time
    expectations of run-time conditions (e.g., estimated predicate selectivities
    and anticipated memory availability). Robustness of query processing can be
    defined as the ability to handle unexpected conditions. Robustness of query
    execution, specifically, can be defined as the ability to process a specific
    plan efficiently in an unexpected condition.

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