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Query Execution

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Can I JOIN multiple sharded tables in a query?

Yes. SingleStore Helios supports advanced join capabilities and will automatically redistribute data as necessary to complete a query. SingleStore Helios can also take advantage of collocated data across shard keys and reference tables to reduce data movement. See Query Execution.

Can I optimize a distributed join involving a small, static table?

Yes, a small table which does not change frequently can be made into a reference table, which is replicated to all the leaf nodes. This ensures that the table does not need to be moved when joined against, at the cost of using more memory. See Distributed SQL.

Why do I sometimes receive an ERROR 1227 when running a query?

The following error will be displayed if you do not have the requisite privileges to run a query:

ERROR 1227 ER_SPECIFIC_ACCESS_DENIED_ERROR: Access denied; you need (at least one of) the SUPER privilege(s) for this op

This error is expected for SingleStore Helios users when the query involves updating either global or engine variables. Please contact SingleStore Support if you need to update these variables.

If this error is encountered when running a query that does not involve global or engine variables, please contact SingleStore Support to help troubleshoot the cause.

Last modified: January 20, 2023

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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