7. Checking Partition Number and Data Skew

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This step checks whether there are enough partitions and if data is properly balanced across your cluster.

Check the total core-to-partition ratio per leaf for the database that is having trouble:
- Run SHOW PARTITIONS on the database in question and compare that with the total number of cores in your cluster.
- Is this ratio at least 1:1? If you have high concurrency, consider increasing the concurrency from 2, 3, or 4 to 1 core to partition ratio.
Check that your data is balanced across the cluster properly by running EXPLAIN REBALANCE PARTITIONS on the database in question. If you see a non-empty set, run REBALANCE PARTITIONS on the database.
Check that your data is redundant by running EXPLAIN RESTORE REDUNDANCY. If you see a non-empty set, run RESTORE REDUNDANCY.
Data Skew: refer to the Detecting and Resolving Data Skew.

Next Steps

If there are enough partitions and no data skew is detected: continue to Step 8.

Last modified: July 17, 2024

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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.

(Optional) Run the following command to view the associated signature files.
Shell
```
curl undefined
```
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.
  Shell
```
curl -O undefined
```

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

Shell

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