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OPTIMIZER_STATISTICS

Warning

SingleStore 9.0 gives you the opportunity to preview, evaluate, and provide feedback on new and upcoming features prior to their general availability. In the interim, SingleStore 8.9 is recommended for production workloads, which can later be upgraded to SingleStore 9.0.

This view contains column statistics calculated on columns when a table is processed by autostats or the ANALYZE command.

It displays one row per column per table. The values displayed here are estimates used for query optimization, they are not exact.

Column Name

Description

DATABASE_NAME

The name of the related database.

TABLE_NAME

The name of the related table.

COLUMN_NAME

The name of the related column.

ROW_COUNT

The number of rows in a given table.

NULL_COUNT

The number of null values stored within a given column.

CARDINALITY

The number of unique values stored within a given column.

AUTOSTATS_ENABLED

Whether or not autostats are currently enabled for a given column.

AUTOSTATS_OUTDATED

Whether or not autostats are considered too out-of-date to be used currently.

AUTOSTATS_ROW_COUNT

This column is deprecated and no longer used and its value is always NULL. See ROW_COUNT instead.

AUTOSTATS_NULL_COUNT

This column is deprecated and no longer used and its value is always NULL. See NULL_COUNT instead.

AUTOSTATS_CARDINALITY

This column is deprecated and no longer used and its value is always NULL. See CARDINALITY instead.

ADVANCED_HISTOGRAMS

Whether advanced histograms are collected on this column.

LEGACY_HISTOGRAMS

Whether legacy histograms are collected on this column. This column is now deprecated.

RANGE_STATS

Whether histograms (of either type) are collected on this column .

SAMPLE_SIZE

The sample size collected to build histograms on this column.

LAST_UPDATED

The timestamp at which autostats were last updated for a given column.

Last modified: August 29, 2022

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Verification instructions

Note: You must install cosign to verify the authenticity of the SingleStore file.

Use the following steps to verify the authenticity of singlestoredb-server, singlestoredb-toolbox, singlestoredb-studio, and singlestore-client SingleStore files that have been downloaded.

You may perform the following steps on any computer that can run cosign, such as the main deployment host of the cluster.

  1. (Optional) Run the following command to view the associated signature files.

    curl undefined

  2. Download the signature file from the SingleStore release server.

    • Option 1: Click the Download Signature button next to the SingleStore file.

    • Option 2: Copy and paste the following URL into the address bar of your browser and save the signature file.

    • Option 3: Run the following command to download the signature file.

      curl -O undefined

  3. After the signature file has been downloaded, run the following command to verify the authenticity of the SingleStore file.

    echo -n undefined |
        cosign verify-blob --certificate-oidc-issuer https://oidc.eks.us-east-1.amazonaws.com/id/CCDCDBA1379A5596AB5B2E46DCA385BC \
          --certificate-identity https://kubernetes.io/namespaces/freya-production/serviceaccounts/job-worker \
          --bundle undefined \
          --new-bundle-format -
    Verified OK