Lock-free Backups

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Lock-free backups do not block INSERT, UPDATE, and DELETE operations at any point during a backup. They do not need to lock and wait for write queries. Lock-free backups are enabled by default

However, ALTER DATABASE command will not run while there is a backup job active on the relevant database. The backup takes the cluster operations lock for the entirety of the backup.

Commands Blocked by the BACKUP Process

ALTER DATABASE
DROP DATABASE

Commands Not Blocked by the BACKUP Process

CREATE TABLE (columnstore and rowstore)
ALTER TABLE (columnstore and rowstore)
DROP TABLE (columnstore and rowstore)
DELETE TABLE
INSERT TABLE
TRUNCATE TABLE (columnstore and rowstore)
CREATE INDEX
DROP INDEX (columnstore and rowstore)
CREATE VIEW
DROP VIEW
ANALYZE TABLE (columnstore and rowstore)
OPTIMIZE COLUMNSTORE TABLE
SHOW TABLE STATUS
SHOW DATABASE STATUS
OPTIMIZE ROWSTORE TABLE

Last modified: July 11, 2025

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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