Snowflake Query Optimization Overview
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Questions and Answers

Check all the Snowflake Editions that have Search Optimization Service enabled. (Select all that apply)

  • Enterprise (correct)
  • Business Critical (correct)
  • Standard
  • VPS (Virtual Private Snowflake) (correct)
  • Search Optimization Service is a ________ level property.

  • Schema
  • Table (correct)
  • Database
  • Column
  • When a table is registered for search optimization service, it applies to all the columns.

    True

    Check all those options if they are valid for search optimization service. (Select all that apply)

    <p>Search optimization service has storage cost.</p> Signup and view all the answers

    The search optimization service speeds only range searches.

    <p>False</p> Signup and view all the answers

    To add or remove search optimization for a table, you must have the necessary privileges. Select all that apply.

    <p>ADD SEARCH OPTIMIZATION privileges on the schema that contains the table.</p> Signup and view all the answers

    The search optimization service does not support external tables.

    <p>True</p> Signup and view all the answers

    The search optimization service currently supports equality predicate and IN list predicate searches.

    <p>True</p> Signup and view all the answers

    Select applicable data types supported by search optimization service. (Select all that apply)

    <p>Date, Time &amp; Timestamp</p> Signup and view all the answers

    The Snowflake optimizer automatically chooses when to use the search optimization service for a particular query. Users cannot control which queries search optimization is used for.

    <p>True</p> Signup and view all the answers

    The search optimization service relies on a maintenance service that runs in the background and is responsible for creating and maintaining the search access path.

    <p>True</p> Signup and view all the answers

    If you clone a table, schema or a database, the search optimization property and search access paths of each table are also cloned.

    <p>True</p> Signup and view all the answers

    The search optimization service creates a search access path data structure that requires space for each table on which search optimization is enabled.

    <p>True</p> Signup and view all the answers

    All tables, be it small or large, benefit from search optimization service.

    <p>False</p> Signup and view all the answers

    Clustering a table benefits BI users who need fast response times for critical dashboards with highly selective filters.

    <p>False</p> Signup and view all the answers

    Point lookup queries that benefit from the search optimization service. Select all that apply.

    <p>The query typically runs for at least tens of seconds.</p> Signup and view all the answers

    The search optimization service does not directly improve the performance of joins.

    <p>True</p> Signup and view all the answers

    The following predicate is not supported because it uses a cast on values in the table column: where to_date(varchar_column) = '2022-12-29';

    <p>True</p> Signup and view all the answers

    Study Notes

    Snowflake Query Optimization Service

    • Search Optimization Service is available in Enterprise, Business Critical, and Virtual Private Snowflake (VPS) editions; Standard edition does not support it.
    • It is a table-level property, meaning it can be applied to one or more complete tables rather than individual columns.
    • When registered, search optimization applies to all columns of the table, provided the data types are supported.
    • Implementing the search optimization service incurs compute and storage costs; it is not free, even in Business Critical editions.
    • The service enhances performance for equality searches and IN predicate searches, not just range searches.
    • Privileges required to modify search optimization status for a table include ownership on the table and specific schema privileges.
    • External tables are not compatible with the search optimization service.
    • Supported data types for search optimization include Integer, Variant, Date/Time/Timestamp, Varchar, Binary, Array, Object, and Geography Data.
    • The Snowflake optimizer autonomously decides when to use the search optimization service for queries.
    • A maintenance service operates in the background to manage the creation and upkeep of the search access path required for the service.
    • Cloning a table, schema, or database also clones the search optimization properties and access paths associated with those tables.
    • Enabling search optimization necessitates additional storage space for each table involved.
    • Not all tables, regardless of size, benefit equally from the search optimization service.
    • Queries with a high distinct value count and not clustered can gain from the search optimization service.
    • The service does not enhance performance for join operations.
    • Predicates that involve casts on table column values, such as using to_date function, are unsupported.

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    Description

    This quiz focuses on the Snowflake Query Optimization Service, detailing its availability in different editions and the associated costs. It covers table-level properties, supported data types, performance enhancements, and necessary privileges for implementation. Test your knowledge on optimizing search capabilities in Snowflake.

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